refactor app module

remove unwanted imports
handle arguments using elvis operator in activities and fragments
get rid of redundant return keyword in a single block method
handle deprecated function calls
handle non null assertion operator with elvis operator

app/src/main/java/chat/rocket/android/app/AppLifecycleObserver.kt

@@ -3,15 +3,10 @@ package chat.rocket.android.app
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleObserver
 import androidx.lifecycle.OnLifecycleEvent
-import chat.rocket.android.server.domain.GetAccountInteractor
 import chat.rocket.android.server.domain.GetCurrentServerInteractor
 import chat.rocket.android.server.infraestructure.ConnectionManagerFactory
-import chat.rocket.android.server.infraestructure.RocketChatClientFactory
-import chat.rocket.common.RocketChatException
 import chat.rocket.common.model.UserStatus
-import chat.rocket.core.internal.realtime.setTemporaryStatus
 import kotlinx.coroutines.experimental.launch
-import timber.log.Timber
 import javax.inject.Inject
 
 class AppLifecycleObserver @Inject constructor(

app/src/main/java/chat/rocket/android/app/DateTimeHelper.kt

 import android.content.Context
 import chat.rocket.android.R
-import org.threeten.bp.*
+import org.threeten.bp.Instant
+import org.threeten.bp.LocalDate
+import org.threeten.bp.LocalDateTime
+import org.threeten.bp.LocalTime
+import org.threeten.bp.Period
+import org.threeten.bp.ZoneId
 import org.threeten.bp.format.DateTimeFormatter
 import org.threeten.bp.format.FormatStyle
 import org.threeten.bp.format.TextStyle
@@ -53,39 +58,39 @@ object DateTimeHelper {
         }
     }
 
-/**
- * Returns a time from a [LocalDateTime].
- *
- * @param localDateTime The [LocalDateTime].
- * @return The time from a [LocalDateTime].
- */
-fun getTime(localDateTime: LocalDateTime): String {
-    val formatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT)
-    return localDateTime.toLocalTime().format(formatter).toString()
-}
+    /**
+     * Returns a time from a [LocalDateTime].
+     *
+     * @param localDateTime The [LocalDateTime].
+     * @return The time from a [LocalDateTime].
+     */
+    fun getTime(localDateTime: LocalDateTime): String {
+        val formatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT)
+        return localDateTime.toLocalTime().format(formatter).toString()
+    }
 
-/**
- * Returns a date time from a [LocalDateTime].
- *
- * @param localDateTime The [LocalDateTime].
- * @return The time from a [LocalDateTime].
- */
-fun getDateTime(localDateTime: LocalDateTime): String {
-    return formatLocalDateTime(localDateTime)
-}
+    /**
+     * Returns a date time from a [LocalDateTime].
+     *
+     * @param localDateTime The [LocalDateTime].
+     * @return The time from a [LocalDateTime].
+     */
+    fun getDateTime(localDateTime: LocalDateTime): String {
+        return formatLocalDateTime(localDateTime)
+    }
 
-private fun formatLocalDateTime(localDateTime: LocalDateTime): String {
-    val formatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT)
-    return localDateTime.format(formatter).toString()
-}
+    private fun formatLocalDateTime(localDateTime: LocalDateTime): String {
+        val formatter = DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT)
+        return localDateTime.format(formatter).toString()
+    }
 
-private fun formatLocalDate(localDate: LocalDate): String {
-    val formatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM)
-    return localDate.format(formatter).toString()
-}
+    private fun formatLocalDate(localDate: LocalDate): String {
+        val formatter = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM)
+        return localDate.format(formatter).toString()
+    }
 
-private fun formatLocalTime(localTime: LocalTime): String {
-    val formatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT)
-    return localTime.format(formatter).toString()
-}
+    private fun formatLocalTime(localTime: LocalTime): String {
+        val formatter = DateTimeFormatter.ofLocalizedTime(FormatStyle.SHORT)
+        return localTime.format(formatter).toString()
+    }
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/authentication/infraestructure/SharedPreferencesMultiServerTokenRepository.kt

@@ -8,19 +8,16 @@ import chat.rocket.android.server.domain.MultiServerTokenRepository
 import com.squareup.moshi.Moshi
 
 @PerActivity
-class SharedPreferencesMultiServerTokenRepository(private val repository: LocalRepository,
-                                                  private val moshi: Moshi
+class SharedPreferencesMultiServerTokenRepository(
+    private val repository: LocalRepository,
+    private val moshi: Moshi
 ) : MultiServerTokenRepository {
 
     override fun get(server: String): TokenModel? {
         val token = repository.get("$TOKEN_KEY$server")
         val adapter = moshi.adapter<TokenModel>(TokenModel::class.java)
 
-        token?.let {
-            return adapter.fromJson(token)
-        }
-
-        return null
+        return token?.let { adapter.fromJson(it) }
     }
 
     override fun save(server: String, token: TokenModel) {

app/src/main/java/chat/rocket/android/authentication/login/ui/LoginFragment.kt

@@ -39,11 +39,9 @@ internal const val REQUEST_CODE_FOR_SIGN_IN_REQUIRED = 1
 internal const val REQUEST_CODE_FOR_MULTIPLE_ACCOUNTS_RESOLUTION = 2
 internal const val REQUEST_CODE_FOR_SAVE_RESOLUTION = 3
 
-fun newInstance(serverName: String): Fragment {
-    return LoginFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(SERVER_NAME, serverName)
-        }
+fun newInstance(serverName: String): Fragment = LoginFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(SERVER_NAME, serverName)
     }
 }
 
@@ -59,9 +57,8 @@ class LoginFragment : Fragment(), LoginView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            serverName = bundle.getString(SERVER_NAME)
+        arguments?.run {
+            serverName = getString(SERVER_NAME)
         }
     }
 
@@ -150,7 +147,7 @@ class LoginFragment : Fragment(), LoginView {
     override fun showGenericErrorMessage() = showMessage(R.string.msg_generic_error)
 
     private fun setupOnClickListener() =
-        ui { _ ->
+        ui {
             button_log_in.setOnClickListener {
                 presenter.authenticateWithUserAndPassword(
                     text_username_or_email.textContent,
@@ -160,7 +157,7 @@ class LoginFragment : Fragment(), LoginView {
         }
 
     override fun showForgotPasswordView() {
-        ui { _ ->
+        ui {
             button_forgot_your_password.isVisible = true
             button_forgot_your_password.setOnClickListener { presenter.forgotPassword() }
 

app/src/main/java/chat/rocket/android/authentication/loginoptions/ui/LoginOptionsFragment.kt

@@ -88,36 +88,34 @@ fun newInstance(
     isLoginFormEnabled: Boolean,
     isNewAccountCreationEnabled: Boolean,
     deepLinkInfo: LoginDeepLinkInfo? = null
-): Fragment {
-    return LoginOptionsFragment().apply {
-        arguments = Bundle(23).apply {
-            putString(SERVER_NAME, serverName)
-            putString(STATE, state)
-            putString(FACEBOOK_OAUTH_URL, facebookOauthUrl)
-            putString(GITHUB_OAUTH_URL, githubOauthUrl)
-            putString(GOOGLE_OAUTH_URL, googleOauthUrl)
-            putString(LINKEDIN_OAUTH_URL, linkedinOauthUrl)
-            putString(GITLAB_OAUTH_URL, gitlabOauthUrl)
-            putString(WORDPRESS_OAUTH_URL, wordpressOauthUrl)
-            putString(CAS_LOGIN_URL, casLoginUrl)
-            putString(CAS_TOKEN, casToken)
-            putString(CAS_SERVICE_NAME, casServiceName)
-            putInt(CAS_SERVICE_NAME_TEXT_COLOR, casServiceNameTextColor)
-            putInt(CAS_SERVICE_BUTTON_COLOR, casServiceButtonColor)
-            putString(CUSTOM_OAUTH_URL, customOauthUrl)
-            putString(CUSTOM_OAUTH_SERVICE_NAME, customOauthServiceName)
-            putInt(CUSTOM_OAUTH_SERVICE_NAME_TEXT_COLOR, customOauthServiceNameTextColor)
-            putInt(CUSTOM_OAUTH_SERVICE_BUTTON_COLOR, customOauthServiceButtonColor)
-            putString(SAML_URL, samlUrl)
-            putString(SAML_TOKEN, samlToken)
-            putString(SAML_SERVICE_NAME, samlServiceName)
-            putInt(SAML_SERVICE_NAME_TEXT_COLOR, samlServiceNameTextColor)
-            putInt(SAML_SERVICE_BUTTON_COLOR, samlServiceButtonColor)
-            putInt(TOTAL_SOCIAL_ACCOUNTS, totalSocialAccountsEnabled)
-            putBoolean(IS_LOGIN_FORM_ENABLED, isLoginFormEnabled)
-            putBoolean(IS_NEW_ACCOUNT_CREATION_ENABLED, isNewAccountCreationEnabled)
-            putParcelable(DEEP_LINK_INFO, deepLinkInfo)
-        }
+): Fragment = LoginOptionsFragment().apply {
+    arguments = Bundle(23).apply {
+        putString(SERVER_NAME, serverName)
+        putString(STATE, state)
+        putString(FACEBOOK_OAUTH_URL, facebookOauthUrl)
+        putString(GITHUB_OAUTH_URL, githubOauthUrl)
+        putString(GOOGLE_OAUTH_URL, googleOauthUrl)
+        putString(LINKEDIN_OAUTH_URL, linkedinOauthUrl)
+        putString(GITLAB_OAUTH_URL, gitlabOauthUrl)
+        putString(WORDPRESS_OAUTH_URL, wordpressOauthUrl)
+        putString(CAS_LOGIN_URL, casLoginUrl)
+        putString(CAS_TOKEN, casToken)
+        putString(CAS_SERVICE_NAME, casServiceName)
+        putInt(CAS_SERVICE_NAME_TEXT_COLOR, casServiceNameTextColor)
+        putInt(CAS_SERVICE_BUTTON_COLOR, casServiceButtonColor)
+        putString(CUSTOM_OAUTH_URL, customOauthUrl)
+        putString(CUSTOM_OAUTH_SERVICE_NAME, customOauthServiceName)
+        putInt(CUSTOM_OAUTH_SERVICE_NAME_TEXT_COLOR, customOauthServiceNameTextColor)
+        putInt(CUSTOM_OAUTH_SERVICE_BUTTON_COLOR, customOauthServiceButtonColor)
+        putString(SAML_URL, samlUrl)
+        putString(SAML_TOKEN, samlToken)
+        putString(SAML_SERVICE_NAME, samlServiceName)
+        putInt(SAML_SERVICE_NAME_TEXT_COLOR, samlServiceNameTextColor)
+        putInt(SAML_SERVICE_BUTTON_COLOR, samlServiceButtonColor)
+        putInt(TOTAL_SOCIAL_ACCOUNTS, totalSocialAccountsEnabled)
+        putBoolean(IS_LOGIN_FORM_ENABLED, isLoginFormEnabled)
+        putBoolean(IS_NEW_ACCOUNT_CREATION_ENABLED, isNewAccountCreationEnabled)
+        putParcelable(DEEP_LINK_INFO, deepLinkInfo)
     }
 }
 
@@ -157,34 +155,33 @@ class LoginOptionsFragment : Fragment(), LoginOptionsView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            serverName = bundle.getString(SERVER_NAME)
-            state = bundle.getString(STATE)
-            facebookOauthUrl = bundle.getString(FACEBOOK_OAUTH_URL)
-            githubOauthUrl = bundle.getString(GITHUB_OAUTH_URL)
-            googleOauthUrl = bundle.getString(GOOGLE_OAUTH_URL)
-            linkedinOauthUrl = bundle.getString(LINKEDIN_OAUTH_URL)
-            gitlabOauthUrl = bundle.getString(GITLAB_OAUTH_URL)
-            wordpressOauthUrl = bundle.getString(WORDPRESS_OAUTH_URL)
-            casLoginUrl = bundle.getString(CAS_LOGIN_URL)
-            casToken = bundle.getString(CAS_TOKEN)
-            casServiceName = bundle.getString(CAS_SERVICE_NAME)
-            casServiceNameTextColor = bundle.getInt(CAS_SERVICE_NAME_TEXT_COLOR)
-            casServiceButtonColor = bundle.getInt(CAS_SERVICE_BUTTON_COLOR)
-            customOauthUrl = bundle.getString(CUSTOM_OAUTH_URL)
-            customOauthServiceName = bundle.getString(CUSTOM_OAUTH_SERVICE_NAME)
-            customOauthServiceTextColor = bundle.getInt(CUSTOM_OAUTH_SERVICE_NAME_TEXT_COLOR)
-            customOauthServiceButtonColor = bundle.getInt(CUSTOM_OAUTH_SERVICE_BUTTON_COLOR)
-            samlUrl = bundle.getString(SAML_URL)
-            samlToken = bundle.getString(SAML_TOKEN)
-            samlServiceName = bundle.getString(SAML_SERVICE_NAME)
-            samlServiceTextColor = bundle.getInt(SAML_SERVICE_NAME_TEXT_COLOR)
-            samlServiceButtonColor = bundle.getInt(SAML_SERVICE_BUTTON_COLOR)
-            totalSocialAccountsEnabled = bundle.getInt(TOTAL_SOCIAL_ACCOUNTS)
-            isLoginFormEnabled = bundle.getBoolean(IS_LOGIN_FORM_ENABLED)
-            isNewAccountCreationEnabled = bundle.getBoolean(IS_NEW_ACCOUNT_CREATION_ENABLED)
-            deepLinkInfo = bundle.getParcelable(DEEP_LINK_INFO)
+        arguments?.run {
+            serverName = getString(SERVER_NAME)
+            state = getString(STATE)
+            facebookOauthUrl = getString(FACEBOOK_OAUTH_URL)
+            githubOauthUrl = getString(GITHUB_OAUTH_URL)
+            googleOauthUrl = getString(GOOGLE_OAUTH_URL)
+            linkedinOauthUrl = getString(LINKEDIN_OAUTH_URL)
+            gitlabOauthUrl = getString(GITLAB_OAUTH_URL)
+            wordpressOauthUrl = getString(WORDPRESS_OAUTH_URL)
+            casLoginUrl = getString(CAS_LOGIN_URL)
+            casToken = getString(CAS_TOKEN)
+            casServiceName = getString(CAS_SERVICE_NAME)
+            casServiceNameTextColor = getInt(CAS_SERVICE_NAME_TEXT_COLOR)
+            casServiceButtonColor = getInt(CAS_SERVICE_BUTTON_COLOR)
+            customOauthUrl = getString(CUSTOM_OAUTH_URL)
+            customOauthServiceName = getString(CUSTOM_OAUTH_SERVICE_NAME)
+            customOauthServiceTextColor = getInt(CUSTOM_OAUTH_SERVICE_NAME_TEXT_COLOR)
+            customOauthServiceButtonColor = getInt(CUSTOM_OAUTH_SERVICE_BUTTON_COLOR)
+            samlUrl = getString(SAML_URL)
+            samlToken = getString(SAML_TOKEN)
+            samlServiceName = getString(SAML_SERVICE_NAME)
+            samlServiceTextColor = getInt(SAML_SERVICE_NAME_TEXT_COLOR)
+            samlServiceButtonColor = getInt(SAML_SERVICE_BUTTON_COLOR)
+            totalSocialAccountsEnabled = getInt(TOTAL_SOCIAL_ACCOUNTS)
+            isLoginFormEnabled = getBoolean(IS_LOGIN_FORM_ENABLED)
+            isNewAccountCreationEnabled = getBoolean(IS_NEW_ACCOUNT_CREATION_ENABLED)
+            deepLinkInfo = getParcelable(DEEP_LINK_INFO)
         }
     }
 
@@ -388,7 +385,7 @@ class LoginOptionsFragment : Fragment(), LoginOptionsView {
     }
 
     override fun setupExpandAccountsView() {
-        ui { _ ->
+        ui {
             expand_more_accounts_container.isVisible = true
             var isAccountsCollapsed = true
             button_expand_collapse_accounts.setOnClickListener {
@@ -406,14 +403,14 @@ class LoginOptionsFragment : Fragment(), LoginOptionsView {
     }
 
     override fun showLoginWithEmailButton() {
-        ui { _ ->
+        ui {
             button_login_with_email.setOnClickListener { presenter.toLoginWithEmail() }
             button_login_with_email.isVisible = true
         }
     }
 
     override fun showCreateNewAccountButton() {
-        ui { _ ->
+        ui {
             button_create_an_account.setOnClickListener { presenter.toCreateAccount() }
             button_create_an_account.isVisible = true
         }

app/src/main/java/chat/rocket/android/authentication/registerusername/ui/RegisterUsernameFragment.kt

@@ -31,12 +31,10 @@ import javax.inject.Inject
 private const val BUNDLE_USER_ID = "user_id"
 private const val BUNDLE_AUTH_TOKEN = "auth_token"
 
-fun newInstance(userId: String, authToken: String): Fragment {
-    return RegisterUsernameFragment().apply {
-        arguments = Bundle(2).apply {
-            putString(BUNDLE_USER_ID, userId)
-            putString(BUNDLE_AUTH_TOKEN, authToken)
-        }
+fun newInstance(userId: String, authToken: String): Fragment = RegisterUsernameFragment().apply {
+    arguments = Bundle(2).apply {
+        putString(BUNDLE_USER_ID, userId)
+        putString(BUNDLE_AUTH_TOKEN, authToken)
     }
 }
 
@@ -53,13 +51,10 @@ class RegisterUsernameFragment : Fragment(), RegisterUsernameView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            userId = bundle.getString(BUNDLE_USER_ID)
-            authToken = bundle.getString(BUNDLE_AUTH_TOKEN)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            userId = getString(BUNDLE_USER_ID, "")
+            authToken = getString(BUNDLE_AUTH_TOKEN, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/authentication/signup/ui/SignupFragment.kt

@@ -75,7 +75,7 @@ class SignupFragment : Fragment(), SignupView {
     }
 
     private fun setupOnClickListener() =
-        ui { _ ->
+        ui {
             button_register.setOnClickListener {
                 presenter.signup(
                     text_username.textContent,

app/src/main/java/chat/rocket/android/authentication/twofactor/ui/TwoFAFragment.kt

@@ -25,12 +25,10 @@ import io.reactivex.disposables.Disposable
 import kotlinx.android.synthetic.main.fragment_authentication_two_fa.*
 import javax.inject.Inject
 
-fun newInstance(username: String, password: String): Fragment {
-    return TwoFAFragment().apply {
-        arguments = Bundle(2).apply {
-            putString(BUNDLE_USERNAME, username)
-            putString(BUNDLE_PASSWORD, password)
-        }
+fun newInstance(username: String, password: String): Fragment = TwoFAFragment().apply {
+    arguments = Bundle(2).apply {
+        putString(BUNDLE_USERNAME, username)
+        putString(BUNDLE_PASSWORD, password)
     }
 }
 
@@ -50,13 +48,10 @@ class TwoFAFragment : Fragment(), TwoFAView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            username = bundle.getString(BUNDLE_USERNAME)
-            password = bundle.getString(BUNDLE_PASSWORD)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            username = getString(BUNDLE_USERNAME, "")
+            password = getString(BUNDLE_PASSWORD, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/chatdetails/adapter/OptionViewHolder.kt

 package chat.rocket.android.chatdetails.adapter
 
-import android.content.Context
+import DrawableHelper
 import android.view.View
 import android.widget.ImageView
 import android.widget.TextView

app/src/main/java/chat/rocket/android/chatdetails/ui/ChatDetailsAdapter.kt

@@ -11,9 +11,15 @@ import chat.rocket.android.util.extensions.inflate
 class ChatDetailsAdapter: RecyclerView.Adapter<OptionViewHolder>() {
     private val options: MutableList<Option> = ArrayList()
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): OptionViewHolder = OptionViewHolder(parent.inflate(R.layout.item_detail_option))
+    override fun onCreateViewHolder(
+        parent: ViewGroup,
+        viewType: Int
+    ): OptionViewHolder = OptionViewHolder(parent.inflate(R.layout.item_detail_option))
 
-    override fun onBindViewHolder(holder: OptionViewHolder, position: Int) = holder.bindViews(OptionItemHolder(options[position]))
+    override fun onBindViewHolder(
+        holder: OptionViewHolder,
+        position: Int
+    ) = holder.bindViews(OptionItemHolder(options[position]))
 
     override fun getItemCount(): Int = options.size
 

app/src/main/java/chat/rocket/android/chatdetails/ui/ChatDetailsFragment.kt

@@ -32,14 +32,12 @@ fun newInstance(
     chatRoomType: String,
     isSubscribed: Boolean,
     disableMenu: Boolean
-): ChatDetailsFragment {
-    return ChatDetailsFragment().apply {
-        arguments = Bundle(4).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-            putString(BUNDLE_CHAT_ROOM_TYPE, chatRoomType)
-            putBoolean(BUNDLE_IS_SUBSCRIBED, isSubscribed)
-            putBoolean(BUNDLE_DISABLE_MENU, disableMenu)
-        }
+): ChatDetailsFragment = ChatDetailsFragment().apply {
+    arguments = Bundle(4).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
+        putString(BUNDLE_CHAT_ROOM_TYPE, chatRoomType)
+        putBoolean(BUNDLE_IS_SUBSCRIBED, isSubscribed)
+        putBoolean(BUNDLE_DISABLE_MENU, disableMenu)
     }
 }
 
@@ -66,15 +64,13 @@ class ChatDetailsFragment : Fragment(), ChatDetailsView {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-            chatRoomType = bundle.getString(BUNDLE_CHAT_ROOM_TYPE)
-            isSubscribed = bundle.getBoolean(BUNDLE_IS_SUBSCRIBED)
-            disableMenu = bundle.getBoolean(BUNDLE_DISABLE_MENU)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID)
+            chatRoomType = getString(BUNDLE_CHAT_ROOM_TYPE)
+            isSubscribed = getBoolean(BUNDLE_IS_SUBSCRIBED)
+            disableMenu = getBoolean(BUNDLE_DISABLE_MENU)
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/chatdetails/viewmodel/ChatDetailsViewModelFactory.kt

@@ -5,9 +5,10 @@ import androidx.lifecycle.ViewModelProvider
 import chat.rocket.android.db.ChatRoomDao
 import javax.inject.Inject
 
-class ChatDetailsViewModelFactory @Inject constructor(private val chatRoomDao: ChatRoomDao) : ViewModelProvider.NewInstanceFactory() {
+class ChatDetailsViewModelFactory @Inject constructor(
+    private val chatRoomDao: ChatRoomDao
+) : ViewModelProvider.NewInstanceFactory() {
 
     @Suppress("UNCHECKED_CAST")
-    override fun <T : ViewModel?> create(modelClass: Class<T>) =
-            ChatDetailsViewModel(chatRoomDao) as T
+    override fun <T : ViewModel?> create(modelClass: Class<T>) = ChatDetailsViewModel(chatRoomDao) as T
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatroom/adapter/ActionsListAdapter.kt

@@ -12,7 +12,10 @@ import com.facebook.drawee.backends.pipeline.Fresco
 import kotlinx.android.synthetic.main.item_action_button.view.*
 import timber.log.Timber
 
-class ActionsListAdapter(actions: List<Action>, var actionAttachmentOnClickListener: ActionAttachmentOnClickListener) : RecyclerView.Adapter<ActionsListAdapter.ViewHolder>() {
+class ActionsListAdapter(
+    actions: List<Action>,
+    var actionAttachmentOnClickListener: ActionAttachmentOnClickListener
+) : RecyclerView.Adapter<ActionsListAdapter.ViewHolder>() {
 
     var actions: List<Action> = actions
 
@@ -62,9 +65,7 @@ class ActionsListAdapter(actions: List<Action>, var actionAttachmentOnClickListe
         return ViewHolder(view)
     }
 
-    override fun getItemCount(): Int {
-        return actions.size
-    }
+    override fun getItemCount(): Int = actions.size
 
     override fun onBindViewHolder(holder: ViewHolder, position: Int) {
         val action = actions[position]

app/src/main/java/chat/rocket/android/chatroom/adapter/ChatRoomAdapter.kt

@@ -76,13 +76,9 @@ class ChatRoomAdapter(
         }
     }
 
-    override fun getItemViewType(position: Int): Int {
-        return dataSet[position].viewType
-    }
+    override fun getItemViewType(position: Int): Int = dataSet[position].viewType
 
-    override fun getItemCount(): Int {
-        return dataSet.size
-    }
+    override fun getItemCount(): Int = dataSet.size
 
     override fun onBindViewHolder(holder: BaseViewHolder<*>, position: Int) {
         if (holder !is MessageViewHolder) {
@@ -174,12 +170,12 @@ class ChatRoomAdapter(
         Timber.d("index: $index")
         if (index > -1) {
             dataSet[index] = message
-            dataSet.forEachIndexed { index, viewModel ->
+            dataSet.forEachIndexed { ind, viewModel ->
                 if (viewModel.messageId == message.messageId) {
                     if (viewModel.nextDownStreamMessage == null) {
                         viewModel.reactions = message.reactions
                     }
-                    notifyItemChanged(index)
+                    notifyItemChanged(ind)
                 }
             }
             // Delete message only if current is a system message update, i.e.: Message Removed
@@ -258,10 +254,10 @@ class ChatRoomAdapter(
                         actionSelectListener?.editMessage(roomId, id, message.message)
                     }
                     R.id.action_message_star -> {
-                        actionSelectListener?.toogleStar(id, !item.isChecked)
+                        actionSelectListener?.toggleStar(id, !item.isChecked)
                     }
                     R.id.action_message_unpin -> {
-                        actionSelectListener?.tooglePin(id, !item.isChecked)
+                        actionSelectListener?.togglePin(id, !item.isChecked)
                     }
                     R.id.action_message_delete -> {
                         actionSelectListener?.deleteMessage(roomId, id)
@@ -298,9 +294,9 @@ class ChatRoomAdapter(
 
         fun editMessage(roomId: String, messageId: String, text: String)
 
-        fun toogleStar(id: String, star: Boolean)
+        fun toggleStar(id: String, star: Boolean)
 
-        fun tooglePin(id: String, pin: Boolean)
+        fun togglePin(id: String, pin: Boolean)
 
         fun deleteMessage(roomId: String, id: String)
 

app/src/main/java/chat/rocket/android/chatroom/adapter/RoomSuggestionsAdapter.kt

@@ -24,8 +24,8 @@ class RoomSuggestionsAdapter : SuggestionsAdapter<RoomSuggestionsViewHolder>("#"
         override fun bind(item: SuggestionModel, itemClickListener: SuggestionsAdapter.ItemClickListener?) {
             item as ChatRoomSuggestionUiModel
             with(itemView) {
-                val fullname = itemView.findViewById<TextView>(R.id.text_fullname)
-                val name = itemView.findViewById<TextView>(R.id.text_name)
+                val fullname = findViewById<TextView>(R.id.text_fullname)
+                val name = findViewById<TextView>(R.id.text_name)
                 name.text = item.name
                 fullname.text = item.fullName
                 setOnClickListener {

app/src/main/java/chat/rocket/android/chatroom/adapter/UrlPreviewViewHolder.kt

@@ -8,15 +8,14 @@ import chat.rocket.android.util.extensions.content
 import chat.rocket.android.util.extensions.openTabbedUrl
 import kotlinx.android.synthetic.main.message_url_preview.view.*
 
-class UrlPreviewViewHolder(itemView: View,
-                           listener: ActionsListener,
-                           reactionListener: EmojiReactionListener? = null)
-    : BaseViewHolder<UrlPreviewUiModel>(itemView, listener, reactionListener) {
+class UrlPreviewViewHolder(
+    itemView: View,
+    listener: ActionsListener,
+    reactionListener: EmojiReactionListener? = null
+) : BaseViewHolder<UrlPreviewUiModel>(itemView, listener, reactionListener) {
 
     init {
-        with(itemView) {
-            setupActionMenu(url_preview_layout)
-        }
+        setupActionMenu(itemView.url_preview_layout)
     }
 
     override fun bindViews(data: UrlPreviewUiModel) {

app/src/main/java/chat/rocket/android/chatroom/presentation/ChatRoomPresenter.kt

@@ -182,8 +182,8 @@ class ChatRoomPresenter @Inject constructor(
             chatRoomId?.let {
                 manager.addRoomChannel(it, roomChangesChannel)
                 for (room in roomChangesChannel) {
-                    dbManager.getRoom(room.id)?.let {
-                        view.onRoomUpdated(roomMapper.map(chatRoom = it, showLastMessage = true))
+                    dbManager.getRoom(room.id)?.let { chatRoom ->
+                        view.onRoomUpdated(roomMapper.map(chatRoom = chatRoom, showLastMessage = true))
                     }
                 }
             }
@@ -1074,7 +1074,7 @@ class ChatRoomPresenter @Inject constructor(
         launchUI(strategy) {
             try {
                 messagesRepository.getById(messageId)?.let { message ->
-                    getChatRoomAsync(message.roomId)?.let { chatRoom ->
+                    getChatRoomAsync(message.roomId)?.let {
                         val models = mapper.map(message)
                         models.firstOrNull()?.permalink?.let {
                             view.copyToClipboard(it)

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomActivity.kt

@@ -31,18 +31,16 @@ fun Context.chatRoomIntent(
     isCreator: Boolean = false,
     isFavorite: Boolean = false,
     chatRoomMessage: String? = null
-): Intent {
-    return Intent(this, ChatRoomActivity::class.java).apply {
-        putExtra(INTENT_CHAT_ROOM_ID, chatRoomId)
-        putExtra(INTENT_CHAT_ROOM_NAME, chatRoomName)
-        putExtra(INTENT_CHAT_ROOM_TYPE, chatRoomType)
-        putExtra(INTENT_CHAT_ROOM_IS_READ_ONLY, isReadOnly)
-        putExtra(INTENT_CHAT_ROOM_LAST_SEEN, chatRoomLastSeen)
-        putExtra(INTENT_CHAT_IS_SUBSCRIBED, isSubscribed)
-        putExtra(INTENT_CHAT_ROOM_IS_CREATOR, isCreator)
-        putExtra(INTENT_CHAT_ROOM_IS_FAVORITE, isFavorite)
-        putExtra(INTENT_CHAT_ROOM_MESSAGE, chatRoomMessage)
-    }
+): Intent = Intent(this, ChatRoomActivity::class.java).apply {
+    putExtra(INTENT_CHAT_ROOM_ID, chatRoomId)
+    putExtra(INTENT_CHAT_ROOM_NAME, chatRoomName)
+    putExtra(INTENT_CHAT_ROOM_TYPE, chatRoomType)
+    putExtra(INTENT_CHAT_ROOM_IS_READ_ONLY, isReadOnly)
+    putExtra(INTENT_CHAT_ROOM_LAST_SEEN, chatRoomLastSeen)
+    putExtra(INTENT_CHAT_IS_SUBSCRIBED, isSubscribed)
+    putExtra(INTENT_CHAT_ROOM_IS_CREATOR, isCreator)
+    putExtra(INTENT_CHAT_ROOM_IS_FAVORITE, isFavorite)
+    putExtra(INTENT_CHAT_ROOM_MESSAGE, chatRoomMessage)
 }
 
 private const val INTENT_CHAT_ROOM_ID = "chat_room_id"
@@ -81,42 +79,44 @@ class ChatRoomActivity : AppCompatActivity(), HasSupportFragmentInjector {
             return
         }
 
-        val chatRoomId = intent.getStringExtra(INTENT_CHAT_ROOM_ID)
-        requireNotNull(chatRoomId) { "no chat_room_id provided in Intent extras" }
+        with(intent) {
+            val chatRoomId = getStringExtra(INTENT_CHAT_ROOM_ID)
+            requireNotNull(chatRoomId) { "no chat_room_id provided in Intent extras" }
 
-        val chatRoomName = intent.getStringExtra(INTENT_CHAT_ROOM_NAME)
-        requireNotNull(chatRoomName) { "no chat_room_name provided in Intent extras" }
+            val chatRoomName = getStringExtra(INTENT_CHAT_ROOM_NAME)
+            requireNotNull(chatRoomName) { "no chat_room_name provided in Intent extras" }
 
-        val chatRoomType = intent.getStringExtra(INTENT_CHAT_ROOM_TYPE)
-        requireNotNull(chatRoomType) { "no chat_room_type provided in Intent extras" }
+            val chatRoomType = getStringExtra(INTENT_CHAT_ROOM_TYPE)
+            requireNotNull(chatRoomType) { "no chat_room_type provided in Intent extras" }
 
-        val isReadOnly = intent.getBooleanExtra(INTENT_CHAT_ROOM_IS_READ_ONLY, true)
+            val isReadOnly = getBooleanExtra(INTENT_CHAT_ROOM_IS_READ_ONLY, true)
 
-        val isCreator = intent.getBooleanExtra(INTENT_CHAT_ROOM_IS_CREATOR, false)
+            val isCreator = getBooleanExtra(INTENT_CHAT_ROOM_IS_CREATOR, false)
 
-        val isFavorite = intent.getBooleanExtra(INTENT_CHAT_ROOM_IS_FAVORITE, false)
+            val isFavorite = getBooleanExtra(INTENT_CHAT_ROOM_IS_FAVORITE, false)
 
-        val chatRoomLastSeen = intent.getLongExtra(INTENT_CHAT_ROOM_LAST_SEEN, -1)
+            val chatRoomLastSeen = getLongExtra(INTENT_CHAT_ROOM_LAST_SEEN, -1)
 
-        val isSubscribed = intent.getBooleanExtra(INTENT_CHAT_IS_SUBSCRIBED, true)
+            val isSubscribed = getBooleanExtra(INTENT_CHAT_IS_SUBSCRIBED, true)
 
-        val chatRoomMessage = intent.getStringExtra(INTENT_CHAT_ROOM_MESSAGE)
+            val chatRoomMessage = getStringExtra(INTENT_CHAT_ROOM_MESSAGE)
 
-        setupToolbar()
+            setupToolbar()
 
-        if (supportFragmentManager.findFragmentByTag(TAG_CHAT_ROOM_FRAGMENT) == null) {
-            addFragment(TAG_CHAT_ROOM_FRAGMENT, R.id.fragment_container) {
-                newInstance(
-                    chatRoomId,
-                    chatRoomName,
-                    chatRoomType,
-                    isReadOnly,
-                    chatRoomLastSeen,
-                    isSubscribed,
-                    isCreator,
-                    isFavorite,
-                    chatRoomMessage
-                )
+            if (supportFragmentManager.findFragmentByTag(TAG_CHAT_ROOM_FRAGMENT) == null) {
+                addFragment(TAG_CHAT_ROOM_FRAGMENT, R.id.fragment_container) {
+                    newInstance(
+                            chatRoomId,
+                            chatRoomName,
+                            chatRoomType,
+                            isReadOnly,
+                            chatRoomLastSeen,
+                            isSubscribed,
+                            isCreator,
+                            isFavorite,
+                            chatRoomMessage
+                    )
+                }
             }
         }
     }

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -111,19 +111,17 @@ fun newInstance(
     isCreator: Boolean = false,
     isFavorite: Boolean = false,
     chatRoomMessage: String? = null
-): Fragment {
-    return ChatRoomFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-            putString(BUNDLE_CHAT_ROOM_NAME, chatRoomName)
-            putString(BUNDLE_CHAT_ROOM_TYPE, chatRoomType)
-            putBoolean(BUNDLE_IS_CHAT_ROOM_READ_ONLY, isReadOnly)
-            putLong(BUNDLE_CHAT_ROOM_LAST_SEEN, chatRoomLastSeen)
-            putBoolean(BUNDLE_CHAT_ROOM_IS_SUBSCRIBED, isSubscribed)
-            putBoolean(BUNDLE_CHAT_ROOM_IS_CREATOR, isCreator)
-            putBoolean(BUNDLE_CHAT_ROOM_IS_FAVORITE, isFavorite)
-            putString(BUNDLE_CHAT_ROOM_MESSAGE, chatRoomMessage)
-        }
+): Fragment = ChatRoomFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
+        putString(BUNDLE_CHAT_ROOM_NAME, chatRoomName)
+        putString(BUNDLE_CHAT_ROOM_TYPE, chatRoomType)
+        putBoolean(BUNDLE_IS_CHAT_ROOM_READ_ONLY, isReadOnly)
+        putLong(BUNDLE_CHAT_ROOM_LAST_SEEN, chatRoomLastSeen)
+        putBoolean(BUNDLE_CHAT_ROOM_IS_SUBSCRIBED, isSubscribed)
+        putBoolean(BUNDLE_CHAT_ROOM_IS_CREATOR, isCreator)
+        putBoolean(BUNDLE_CHAT_ROOM_IS_FAVORITE, isFavorite)
+        putString(BUNDLE_CHAT_ROOM_MESSAGE, chatRoomMessage)
     }
 }
 
@@ -272,20 +270,17 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
         AndroidSupportInjection.inject(this)
         setHasOptionsMenu(true)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-            chatRoomName = bundle.getString(BUNDLE_CHAT_ROOM_NAME)
-            chatRoomType = bundle.getString(BUNDLE_CHAT_ROOM_TYPE)
-            isReadOnly = bundle.getBoolean(BUNDLE_IS_CHAT_ROOM_READ_ONLY)
-            isSubscribed = bundle.getBoolean(BUNDLE_CHAT_ROOM_IS_SUBSCRIBED)
-            chatRoomLastSeen = bundle.getLong(BUNDLE_CHAT_ROOM_LAST_SEEN)
-            isCreator = bundle.getBoolean(BUNDLE_CHAT_ROOM_IS_CREATOR)
-            isFavorite = bundle.getBoolean(BUNDLE_CHAT_ROOM_IS_FAVORITE)
-            chatRoomMessage = bundle.getString(BUNDLE_CHAT_ROOM_MESSAGE)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID, "")
+            chatRoomName = getString(BUNDLE_CHAT_ROOM_NAME, "")
+            chatRoomType = getString(BUNDLE_CHAT_ROOM_TYPE, "")
+            isReadOnly = getBoolean(BUNDLE_IS_CHAT_ROOM_READ_ONLY)
+            isSubscribed = getBoolean(BUNDLE_CHAT_ROOM_IS_SUBSCRIBED)
+            chatRoomLastSeen = getLong(BUNDLE_CHAT_ROOM_LAST_SEEN)
+            isCreator = getBoolean(BUNDLE_CHAT_ROOM_IS_CREATOR)
+            isFavorite = getBoolean(BUNDLE_CHAT_ROOM_IS_FAVORITE)
+            chatRoomMessage = getString(BUNDLE_CHAT_ROOM_MESSAGE)
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
 
         adapter = ChatRoomAdapter(chatRoomId, chatRoomType, chatRoomName, this, reactionListener = this, navigator = navigator)
     }
@@ -758,21 +753,20 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
         ui {
             text_connection_status.fadeIn()
             handler.removeCallbacks(dismissStatus)
-            when (state) {
+            text_connection_status.text = when (state) {
                 is State.Connected -> {
-                    text_connection_status.text = getString(R.string.status_connected)
                     handler.postDelayed(dismissStatus, 2000)
+                    getString(R.string.status_connected)
+                }
+                is State.Disconnected -> getString(R.string.status_disconnected)
+                is State.Connecting -> getString(R.string.status_connecting)
+                is State.Authenticating -> getString(R.string.status_authenticating)
+                is State.Disconnecting -> getString(R.string.status_disconnecting)
+                is State.Waiting -> getString(R.string.status_waiting, state.seconds)
+                else -> {
+                    handler.postDelayed(dismissStatus, 500)
+                    ""
                 }
-                is State.Disconnected ->
-                    text_connection_status.text = getString(R.string.status_disconnected)
-                is State.Connecting ->
-                    text_connection_status.text = getString(R.string.status_connecting)
-                is State.Authenticating ->
-                    text_connection_status.text = getString(R.string.status_authenticating)
-                is State.Disconnecting ->
-                    text_connection_status.text = getString(R.string.status_disconnecting)
-                is State.Waiting ->
-                    text_connection_status.text = getString(R.string.status_waiting, state.seconds)
             }
         }
     }
@@ -1098,7 +1092,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
         presenter.editMessage(roomId, messageId, text)
     }
 
-    override fun toogleStar(id: String, star: Boolean) {
+    override fun toggleStar(id: String, star: Boolean) {
         if (star) {
             presenter.starMessage(id)
         } else {
@@ -1106,7 +1100,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
         }
     }
 
-    override fun tooglePin(id: String, pin: Boolean) {
+    override fun togglePin(id: String, pin: Boolean) {
         if (pin) {
             presenter.pinMessage(id)
         } else {

app/src/main/java/chat/rocket/android/chatroom/uimodel/UiModelMapper.kt

@@ -416,21 +416,19 @@ class UiModelMapper @Inject constructor(
         return fullUrl
     }
 
-    private fun attachmentText(text: String?, attachment: Attachment?, context: Context): String? {
-        return if (attachment != null) {
+    private fun attachmentText(text: String?, attachment: Attachment?, context: Context): String? = attachment?.run {
+        with(context) {
             when {
-                attachment.imageUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_photo)
-                attachment.videoUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_video)
-                attachment.audioUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_audio)
-                attachment.titleLink.isNotNullNorEmpty() &&
-                        attachment.type?.contentEquals("file") == true ->
-                    context.getString(R.string.msg_preview_file)
+                imageUrl.isNotNullNorEmpty() -> getString(R.string.msg_preview_photo)
+                videoUrl.isNotNullNorEmpty() -> getString(R.string.msg_preview_video)
+                audioUrl.isNotNullNorEmpty() -> getString(R.string.msg_preview_audio)
+                titleLink.isNotNullNorEmpty() &&
+                        type?.contentEquals("file") == true ->
+                    getString(R.string.msg_preview_file)
                 else -> text
             }
-        } else {
-            text
         }
-    }
+    } ?: text
 
     private fun attachmentDescription(attachment: Attachment): String? {
         return attachment.description
@@ -464,11 +462,9 @@ class UiModelMapper @Inject constructor(
             subscriptionId = chatRoom.subscriptionId)
     }
 
-    private fun mapMessagePreview(message: Message): Message {
-        return when (message.isSystemMessage()) {
-            false -> stripMessageQuotes(message)
-            true -> message.copy(message = getSystemMessage(message).toString())
-        }
+    private fun mapMessagePreview(message: Message): Message = when (message.isSystemMessage()) {
+        false -> stripMessageQuotes(message)
+        true -> message.copy(message = getSystemMessage(message).toString())
     }
 
     private fun getReactions(message: Message): List<ReactionUiModel> {
@@ -535,37 +531,33 @@ class UiModelMapper @Inject constructor(
 
     private fun getTime(timestamp: Long) = DateTimeHelper.getTime(DateTimeHelper.getLocalDateTime(timestamp))
 
-    private fun getContent(message: Message): CharSequence {
-        return when (message.isSystemMessage()) {
-            true -> getSystemMessage(message)
-            false -> parser.render(message, currentUsername)
-        }
+    private fun getContent(message: Message): CharSequence = when (message.isSystemMessage()) {
+        true -> getSystemMessage(message)
+        false -> parser.render(message, currentUsername)
     }
 
     private fun getSystemMessage(message: Message): CharSequence {
-        val content = when (message.type) {
-            //TODO: Add implementation for Welcome type.
-            is MessageType.MessageRemoved -> context.getString(R.string.message_removed)
-            is MessageType.UserJoined -> context.getString(R.string.message_user_joined_channel)
-            is MessageType.UserLeft -> context.getString(R.string.message_user_left)
-            is MessageType.UserAdded -> context.getString(R.string.message_user_added_by, message.message, message.sender?.username)
-            is MessageType.RoomNameChanged -> context.getString(R.string.message_room_name_changed, message.message, message.sender?.username)
-            is MessageType.UserRemoved -> context.getString(R.string.message_user_removed_by, message.message, message.sender?.username)
-            is MessageType.MessagePinned -> context.getString(R.string.message_pinned)
-            is MessageType.UserMuted -> context.getString(R.string.message_muted, message.message, message.sender?.username)
-            is MessageType.UserUnMuted -> context.getString(R.string.message_unmuted, message.message, message.sender?.username)
-            is MessageType.SubscriptionRoleAdded -> context.getString(R.string.message_role_add, message.message, message.role, message.sender?.username)
-            is MessageType.SubscriptionRoleRemoved -> context.getString(R.string.message_role_removed, message.message, message.role, message.sender?.username)
-            is MessageType.RoomChangedPrivacy -> context.getString(R.string.message_room_changed_privacy, message.message, message.sender?.username)
-            else -> {
-                throw InvalidParameterException("Invalid message type: ${message.type}")
+        val content = with(context) {
+            when (message.type) {
+                //TODO: Add implementation for Welcome type.
+                is MessageType.MessageRemoved -> getString(R.string.message_removed)
+                is MessageType.UserJoined -> getString(R.string.message_user_joined_channel)
+                is MessageType.UserLeft -> getString(R.string.message_user_left)
+                is MessageType.UserAdded -> getString(R.string.message_user_added_by, message.message, message.sender?.username)
+                is MessageType.RoomNameChanged -> getString(R.string.message_room_name_changed, message.message, message.sender?.username)
+                is MessageType.UserRemoved -> getString(R.string.message_user_removed_by, message.message, message.sender?.username)
+                is MessageType.MessagePinned -> getString(R.string.message_pinned)
+                is MessageType.UserMuted -> getString(R.string.message_muted, message.message, message.sender?.username)
+                is MessageType.UserUnMuted -> getString(R.string.message_unmuted, message.message, message.sender?.username)
+                is MessageType.SubscriptionRoleAdded -> getString(R.string.message_role_add, message.message, message.role, message.sender?.username)
+                is MessageType.SubscriptionRoleRemoved -> getString(R.string.message_role_removed, message.message, message.role, message.sender?.username)
+                is MessageType.RoomChangedPrivacy -> getString(R.string.message_room_changed_privacy, message.message, message.sender?.username)
+                else -> throw InvalidParameterException("Invalid message type: ${message.type}")
             }
         }
         val spannableMsg = SpannableStringBuilder(content)
-        spannableMsg.setSpan(StyleSpan(Typeface.ITALIC), 0, spannableMsg.length,
-            0)
-        spannableMsg.setSpan(ForegroundColorSpan(Color.GRAY), 0, spannableMsg.length,
-            0)
+        spannableMsg.setSpan(StyleSpan(Typeface.ITALIC), 0, spannableMsg.length, 0)
+        spannableMsg.setSpan(ForegroundColorSpan(Color.GRAY), 0, spannableMsg.length, 0)
 
         return spannableMsg
     }

app/src/main/java/chat/rocket/android/chatrooms/adapter/RoomUiModelMapper.kt

@@ -77,77 +77,71 @@ class RoomUiModelMapper(
         return list
     }
 
-    private fun mapUser(user: User): RoomUiModel {
-        return with(user) {
-            val name = mapName(user.username!!, user.name)
-            val status = user.status
-            val avatar = serverUrl.avatarUrl(user.username!!)
-            val username = user.username!!
-
-            RoomUiModel(
+    private fun mapUser(user: User): RoomUiModel = with(user) {
+        val name = mapName(user.username!!, user.name)
+        val status = user.status
+        val avatar = serverUrl.avatarUrl(user.username!!)
+        val username = user.username!!
+
+        RoomUiModel(
                 id = user.id,
                 name = name,
                 type = roomTypeOf(RoomType.DIRECT_MESSAGE),
                 avatar = avatar,
                 status = status,
                 username = username
-            )
-        }
+        )
     }
 
-    private fun mapRoom(room: Room, showLastMessage: Boolean = true): RoomUiModel {
-        return with(room) {
-            RoomUiModel(
+    private fun mapRoom(room: Room, showLastMessage: Boolean = true): RoomUiModel = with(room) {
+        RoomUiModel(
                 id = id,
                 name = name!!,
                 type = type,
                 avatar = serverUrl.avatarUrl(name!!, isGroupOrChannel = true),
                 lastMessage = if (showLastMessage) {
                     mapLastMessage(
-                        lastMessage?.sender?.id, lastMessage?.sender?.username,
-                        lastMessage?.sender?.name, lastMessage?.message,
-                        isDirectMessage = type is RoomType.DirectMessage
+                            lastMessage?.sender?.id, lastMessage?.sender?.username,
+                            lastMessage?.sender?.name, lastMessage?.message,
+                            isDirectMessage = type is RoomType.DirectMessage
                     )
                 } else {
                     null
                 },
                 muted = muted.orEmpty(),
                 writable = isChannelWritable(muted)
-            )
-        }
+        )
     }
 
-    fun map(chatRoom: ChatRoom, showLastMessage: Boolean = true): RoomUiModel {
-        return with(chatRoom.chatRoom) {
-            val isUnread = alert || unread > 0
-            val type = roomTypeOf(type)
-            val status = chatRoom.status?.let { userStatusOf(it) }
-            val roomName = mapName(name, fullname)
-            val favorite = favorite
-            val timestamp = mapDate(lastMessageTimestamp ?: updatedAt)
-            val avatar = if (type is RoomType.DirectMessage) {
-                serverUrl.avatarUrl(name)
-            } else {
-                serverUrl.avatarUrl(name, isGroupOrChannel = true)
-            }
-            val unread = mapUnread(unread)
-            val lastMessage = if (showLastMessage) {
-                mapLastMessage(
+    fun map(chatRoom: ChatRoom, showLastMessage: Boolean = true): RoomUiModel = with(chatRoom.chatRoom) {
+        val isUnread = alert || unread > 0
+        val type = roomTypeOf(type)
+        val status = chatRoom.status?.let { userStatusOf(it) }
+        val roomName = mapName(name, fullname)
+        val favorite = favorite
+        val timestamp = mapDate(lastMessageTimestamp ?: updatedAt)
+        val avatar = if (type is RoomType.DirectMessage) {
+            serverUrl.avatarUrl(name)
+        } else {
+            serverUrl.avatarUrl(name, isGroupOrChannel = true)
+        }
+        val unread = mapUnread(unread)
+        val lastMessage = if (showLastMessage) {
+            mapLastMessage(
                     lastMessageUserId,
                     chatRoom.lastMessageUserName,
                     chatRoom.lastMessageUserFullName,
                     lastMessageText,
                     type is RoomType.DirectMessage
-                )
-            } else {
-                null
-            }
-            val hasMentions = mapMentions(userMentions, groupMentions)
-            val open = open
-            val lastMessageMarkdown =
-                lastMessage?.let { Markwon.markdown(context, it.toString()).toString() }
+            )
+        } else {
+            null
+        }
+        val hasMentions = mapMentions(userMentions, groupMentions)
+        val open = open
+        val lastMessageMarkdown = lastMessage?.let { Markwon.markdown(context, it.toString()).toString() }
 
-            RoomUiModel(
+        RoomUiModel(
                 id = id,
                 name = roomName,
                 type = type,
@@ -163,8 +157,7 @@ class RoomUiModelMapper(
                 username = if (type is RoomType.DirectMessage) name else null,
                 muted = muted.orEmpty(),
                 writable = isChannelWritable(muted)
-            )
-        }
+        )
     }
 
     private fun isChannelWritable(muted: List<String>?): Boolean {
@@ -172,15 +165,13 @@ class RoomUiModelMapper(
         return canWriteToReadOnlyChannels || !muted.orEmpty().contains(currentUser?.username)
     }
 
-    private fun roomType(type: String): String {
-        val resources = context.resources
-
-        return when (type) {
-            RoomType.CHANNEL -> resources.getString(R.string.header_channel)
-            RoomType.PRIVATE_GROUP -> resources.getString(R.string.header_private_groups)
-            RoomType.DIRECT_MESSAGE -> resources.getString(R.string.header_direct_messages)
-            RoomType.LIVECHAT -> resources.getString(R.string.header_live_chats)
-            else -> resources.getString(R.string.header_unknown)
+    private fun roomType(type: String): String = with(context.resources) {
+        when (type) {
+            RoomType.CHANNEL -> getString(R.string.header_channel)
+            RoomType.PRIVATE_GROUP -> getString(R.string.header_private_groups)
+            RoomType.DIRECT_MESSAGE -> getString(R.string.header_direct_messages)
+            RoomType.LIVECHAT -> getString(R.string.header_live_chats)
+            else -> getString(R.string.header_unknown)
         }
     }
 
@@ -213,13 +204,11 @@ class RoomUiModelMapper(
         }
     }
 
-    private fun mapUnread(unread: Long): String? {
-        return when (unread) {
-            0L -> null
-            in 1..99 -> unread.toString()
-            else -> context.getString(R.string.msg_more_than_ninety_nine_unread_messages)
+    private fun mapUnread(unread: Long): String? = when (unread) {
+        0L -> null
+        in 1..99 -> unread.toString()
+        else -> context.getString(R.string.msg_more_than_ninety_nine_unread_messages)
 
-        }
     }
 
     private fun mapMentions(userMentions: Long?, groupMentions: Long?): Boolean {

app/src/main/java/chat/rocket/android/chatrooms/adapter/RoomViewHolder.kt

@@ -8,6 +8,7 @@ import androidx.core.view.isInvisible
 import androidx.core.view.isVisible
 import chat.rocket.android.R
 import chat.rocket.android.chatrooms.adapter.model.RoomUiModel
+import chat.rocket.android.util.extension.setTextViewAppearance
 import chat.rocket.common.model.RoomType
 import chat.rocket.common.model.UserStatus
 import kotlinx.android.synthetic.main.item_chat.view.*
@@ -16,12 +17,12 @@ import kotlinx.android.synthetic.main.unread_messages_badge.view.*
 class RoomViewHolder(itemView: View, private val listener: (RoomUiModel) -> Unit) :
     ViewHolder<RoomItemHolder>(itemView) {
     private val resources: Resources = itemView.resources
-    private val channelIcon: Drawable = resources.getDrawable(R.drawable.ic_hashtag_12dp)
-    private val groupIcon: Drawable = resources.getDrawable(R.drawable.ic_lock_12_dp)
-    private val onlineIcon: Drawable = resources.getDrawable(R.drawable.ic_status_online_12dp)
-    private val awayIcon: Drawable = resources.getDrawable(R.drawable.ic_status_away_12dp)
-    private val busyIcon: Drawable = resources.getDrawable(R.drawable.ic_status_busy_12dp)
-    private val offlineIcon: Drawable = resources.getDrawable(R.drawable.ic_status_invisible_12dp)
+    private val channelIcon: Drawable = resources.getDrawable(R.drawable.ic_hashtag_12dp, null)
+    private val groupIcon: Drawable = resources.getDrawable(R.drawable.ic_lock_12_dp, null)
+    private val onlineIcon: Drawable = resources.getDrawable(R.drawable.ic_status_online_12dp, null)
+    private val awayIcon: Drawable = resources.getDrawable(R.drawable.ic_status_away_12dp, null)
+    private val busyIcon: Drawable = resources.getDrawable(R.drawable.ic_status_busy_12dp, null)
+    private val offlineIcon: Drawable = resources.getDrawable(R.drawable.ic_status_invisible_12dp, null)
 
     override fun bindViews(data: RoomItemHolder) {
         val room = data.data
@@ -53,14 +54,14 @@ class RoomViewHolder(itemView: View, private val listener: (RoomUiModel) -> Unit
                 if (room.unread == null) text_total_unread_messages.text = "!"
                 if (room.unread != null) text_total_unread_messages.text = room.unread
                 if (room.mentions) text_total_unread_messages.text = "@${room.unread}"
-                text_chat_name.setTextAppearance(context, R.style.ChatList_ChatName_Unread_TextView)
-                text_timestamp.setTextAppearance(context, R.style.ChatList_Timestamp_Unread_TextView)
-                text_last_message.setTextAppearance(context, R.style.ChatList_LastMessage_Unread_TextView)
+                text_chat_name.setTextViewAppearance(context, R.style.ChatList_ChatName_Unread_TextView)
+                text_timestamp.setTextViewAppearance(context, R.style.ChatList_Timestamp_Unread_TextView)
+                text_last_message.setTextViewAppearance(context, R.style.ChatList_LastMessage_Unread_TextView)
                 text_total_unread_messages.isVisible = true
             } else {
-                text_chat_name.setTextAppearance(context, R.style.ChatList_ChatName_TextView)
-                text_timestamp.setTextAppearance(context, R.style.ChatList_Timestamp_TextView)
-                text_last_message.setTextAppearance(context, R.style.ChatList_LastMessage_TextView)
+                text_chat_name.setTextViewAppearance(context, R.style.ChatList_ChatName_TextView)
+                text_timestamp.setTextViewAppearance(context, R.style.ChatList_Timestamp_TextView)
+                text_last_message.setTextViewAppearance(context, R.style.ChatList_LastMessage_TextView)
                 text_total_unread_messages.isInvisible = true
             }
 
@@ -68,20 +69,16 @@ class RoomViewHolder(itemView: View, private val listener: (RoomUiModel) -> Unit
         }
     }
 
-    private fun getRoomDrawable(type: RoomType): Drawable? {
-        return when (type) {
-            is RoomType.Channel -> channelIcon
-            is RoomType.PrivateGroup -> groupIcon
-            else -> null
-        }
+    private fun getRoomDrawable(type: RoomType): Drawable? = when (type) {
+        is RoomType.Channel -> channelIcon
+        is RoomType.PrivateGroup -> groupIcon
+        else -> null
     }
 
-    private fun getStatusDrawable(status: UserStatus): Drawable {
-        return when (status) {
-            is UserStatus.Online -> onlineIcon
-            is UserStatus.Away -> awayIcon
-            is UserStatus.Busy -> busyIcon
-            else -> offlineIcon
-        }
+    private fun getStatusDrawable(status: UserStatus): Drawable = when (status) {
+        is UserStatus.Online -> onlineIcon
+        is UserStatus.Away -> awayIcon
+        is UserStatus.Busy -> busyIcon
+        else -> offlineIcon
     }
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/chatrooms/adapter/RoomsAdapter.kt

@@ -19,22 +19,20 @@ class RoomsAdapter(private val listener: (RoomUiModel) -> Unit) :
             notifyDataSetChanged()
         }
 
-    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder<*> {
-        return when (viewType) {
-            VIEW_TYPE_ROOM -> {
-                val view = parent.inflate(R.layout.item_chat)
-                RoomViewHolder(view, listener)
-            }
-            VIEW_TYPE_HEADER -> {
-                val view = parent.inflate(R.layout.item_chatroom_header)
-                HeaderViewHolder(view)
-            }
-            VIEW_TYPE_LOADING -> {
-                val view = parent.inflate(R.layout.item_loading)
-                LoadingViewHolder(view)
-            }
-            else -> throw IllegalStateException("View type must be either Room, Header or Loading")
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder<*> = when (viewType) {
+        VIEW_TYPE_ROOM -> {
+            val view = parent.inflate(R.layout.item_chat)
+            RoomViewHolder(view, listener)
+        }
+        VIEW_TYPE_HEADER -> {
+            val view = parent.inflate(R.layout.item_chatroom_header)
+            HeaderViewHolder(view)
+        }
+        VIEW_TYPE_LOADING -> {
+            val view = parent.inflate(R.layout.item_loading)
+            LoadingViewHolder(view)
         }
+        else -> throw IllegalStateException("View type must be either Room, Header or Loading")
     }
 
     override fun getItemCount() = values.size
@@ -49,13 +47,11 @@ class RoomsAdapter(private val listener: (RoomUiModel) -> Unit) :
         }
     }
 
-    override fun getItemViewType(position: Int): Int {
-        return when (values[position]) {
-            is RoomItemHolder -> VIEW_TYPE_ROOM
-            is HeaderItemHolder -> VIEW_TYPE_HEADER
-            is LoadingItemHolder -> VIEW_TYPE_LOADING
-            else -> throw IllegalStateException("View type must be either Room, Header or Loading")
-        }
+    override fun getItemViewType(position: Int): Int = when (values[position]) {
+        is RoomItemHolder -> VIEW_TYPE_ROOM
+        is HeaderItemHolder -> VIEW_TYPE_HEADER
+        is LoadingItemHolder -> VIEW_TYPE_LOADING
+        else -> throw IllegalStateException("View type must be either Room, Header or Loading")
     }
 
     override fun onBindViewHolder(holder: ViewHolder<*>, position: Int) {

app/src/main/java/chat/rocket/android/chatrooms/ui/ChatRoomsFragment.kt

@@ -69,11 +69,9 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
     private var progressDialog: ProgressDialog? = null
 
     companion object {
-        fun newInstance(chatRoomId: String? = null): ChatRoomsFragment {
-            return ChatRoomsFragment().apply {
-                arguments = Bundle(1).apply {
-                    putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-                }
+        fun newInstance(chatRoomId: String? = null): ChatRoomsFragment = ChatRoomsFragment().apply {
+            arguments = Bundle(1).apply {
+                putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
             }
         }
     }
@@ -82,9 +80,8 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
         setHasOptionsMenu(true)
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID)
             chatRoomId.ifNotNullNotEmpty { roomId ->
                 presenter.loadChatRoom(roomId)
                 chatRoomId = null
@@ -320,21 +317,20 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
         ui {
             text_connection_status.fadeIn()
             handler.removeCallbacks(dismissStatus)
-            when (state) {
+            text_connection_status.text = when (state) {
                 is State.Connected -> {
-                    text_connection_status.text = getString(R.string.status_connected)
                     handler.postDelayed(dismissStatus, 2000)
+                    getString(R.string.status_connected)
+                }
+                is State.Disconnected -> getString(R.string.status_disconnected)
+                is State.Connecting -> getString(R.string.status_connecting)
+                is State.Authenticating -> getString(R.string.status_authenticating)
+                is State.Disconnecting -> getString(R.string.status_disconnecting)
+                is State.Waiting -> getString(R.string.status_waiting, state.seconds)
+                else -> {
+                    handler.postDelayed(dismissStatus, 500)
+                    ""
                 }
-                is State.Disconnected -> text_connection_status.text =
-                        getString(R.string.status_disconnected)
-                is State.Connecting -> text_connection_status.text =
-                        getString(R.string.status_connecting)
-                is State.Authenticating -> text_connection_status.text =
-                        getString(R.string.status_authenticating)
-                is State.Disconnecting -> text_connection_status.text =
-                        getString(R.string.status_disconnecting)
-                is State.Waiting -> text_connection_status.text =
-                        getString(R.string.status_waiting, state.seconds)
             }
         }
     }

app/src/main/java/chat/rocket/android/createchannel/ui/CreateChannelFragment.kt

@@ -45,9 +45,7 @@ class CreateChannelFragment : Fragment(), CreateChannelView, ActionMode.Callback
     lateinit var analyticsManager: AnalyticsManager
     private var actionMode: ActionMode? = null
     private val adapter: MembersAdapter = MembersAdapter {
-        if (it.username != null) {
-            processSelectedMember(it.username)
-        }
+        it.username?.run { processSelectedMember(this) }
     }
     private val compositeDisposable = CompositeDisposable()
     private var channelType: String = RoomType.CHANNEL
@@ -294,8 +292,8 @@ class CreateChannelFragment : Fragment(), CreateChannelView, ActionMode.Callback
 
     private fun addChip(chipText: String) {
         val chip = Chip(context)
-        chip.chipText = chipText
-        chip.isCloseIconEnabled = true
+        chip.text = chipText
+        chip.isCloseIconVisible = true
         chip.setChipBackgroundColorResource(R.color.icon_grey)
         setupChipOnCloseIconClickListener(chip)
         chip_group_member.addView(chip)
@@ -304,7 +302,7 @@ class CreateChannelFragment : Fragment(), CreateChannelView, ActionMode.Callback
     private fun setupChipOnCloseIconClickListener(chip: Chip) {
         chip.setOnCloseIconClickListener {
             removeChip(it)
-            removeMember((it as Chip).chipText.toString())
+            removeMember((it as Chip).text.toString())
             // whenever we remove a chip we should process the chip group visibility.
             processChipGroupVisibility()
         }

app/src/main/java/chat/rocket/android/db/DatabaseManager.kt

@@ -40,6 +40,12 @@ import kotlinx.coroutines.experimental.newSingleThreadContext
 import kotlinx.coroutines.experimental.withContext
 import timber.log.Timber
 import java.util.HashSet
+import kotlin.collections.ArrayList
+import kotlin.collections.HashMap
+import kotlin.collections.LinkedHashMap
+import kotlin.collections.component1
+import kotlin.collections.component2
+import kotlin.collections.set
 import kotlin.system.measureTimeMillis
 
 class DatabaseManager(val context: Application, val serverUrl: String) {
@@ -140,7 +146,7 @@ class DatabaseManager(val context: Application, val serverUrl: String) {
             batch.forEach {
                 when (it.type) {
                     is Type.Removed -> toRemove.add(removeChatRoom(it.data))
-                    is Type.Inserted -> insertChatRoom(it.data)?.let { toInsert.add(it) }
+                    is Type.Inserted -> insertChatRoom(it.data)?.let { room -> toInsert.add(room) }
                     is Type.Updated -> {
                         when (it.data) {
                             is Subscription -> updateSubs[(it.data as Subscription).roomId] = it.data as Subscription
@@ -186,16 +192,14 @@ class DatabaseManager(val context: Application, val serverUrl: String) {
         }
     }
 
-    fun processMessagesBatch(messages: List<Message>): Job {
-        return launch(dbManagerContext) {
-            val list = mutableListOf<Pair<MessageEntity, List<BaseMessageEntity>>>()
-            messages.forEach { message ->
-                val pair = createMessageEntities(message)
-                list.add(pair)
-            }
-
-            sendOperation(Operation.InsertMessages(list))
+    fun processMessagesBatch(messages: List<Message>): Job = launch(dbManagerContext) {
+        val list = mutableListOf<Pair<MessageEntity, List<BaseMessageEntity>>>()
+        messages.forEach { message ->
+            val pair = createMessageEntities(message)
+            list.add(pair)
         }
+
+        sendOperation(Operation.InsertMessages(list))
     }
 
     private suspend fun createMessageEntities(message: Message): Pair<MessageEntity, List<BaseMessageEntity>> {
@@ -213,91 +217,70 @@ class DatabaseManager(val context: Application, val serverUrl: String) {
         return Pair(messageEntity, list)
     }
 
-    private fun createReactions(message: Message): List<BaseMessageEntity>? {
-        if (message.reactions == null || message.reactions!!.isEmpty()) {
-            return null
-        }
-
-        val reactions = message.reactions!!
-
-        val list = mutableListOf<BaseMessageEntity>()
-        reactions.keys.forEach { reaction ->
-            val users = reactions[reaction]
-            users?.let { users ->
-                list.add(ReactionEntity(reaction, message.id, users.size, users.joinToString()))
+    private fun createReactions(message: Message): List<BaseMessageEntity>? = message.reactions?.run {
+        if (isNotEmpty()) {
+            val list = mutableListOf<BaseMessageEntity>()
+            keys.forEach { reaction ->
+                get(reaction)?.let { reactionValue ->
+                    list.add(ReactionEntity(reaction, message.id, size, reactionValue.joinToString()))
+                }
             }
-        }
-
-        return list
+            list
+        } else null
     }
 
-    private fun createUrlEntities(message: Message): List<BaseMessageEntity>? {
-        if (message.urls == null || message.urls!!.isEmpty()) {
-            return null
-        }
-
-        val list = mutableListOf<UrlEntity>()
-        message.urls!!.forEach { url ->
-            list.add(UrlEntity(message.id, url.url, url.parsedUrl?.host, url.meta?.title,
-                url.meta?.description, url.meta?.imageUrl))
-        }
-
-        return list
+    private fun createUrlEntities(message: Message): List<BaseMessageEntity>? = message.urls?.run {
+        if (isNotEmpty()) {
+            val list = mutableListOf<UrlEntity>()
+            forEach { url ->
+                list.add(UrlEntity(message.id, url.url, url.parsedUrl?.host, url.meta?.title,
+                        url.meta?.description, url.meta?.imageUrl))
+            }
+            list
+        } else null
     }
 
-    private fun createChannelRelations(message: Message): List<BaseMessageEntity>? {
-        if (message.channels == null || message.channels!!.isEmpty()) {
-            return null
-        }
-
-        val list = mutableListOf<MessageChannels>()
-        message.channels!!.forEach { channel ->
-            list.add(MessageChannels(message.id, channel.id, channel.name))
-        }
-
-        return list
+    private fun createChannelRelations(message: Message): List<BaseMessageEntity>? = message.channels?.run {
+        if (isNotEmpty()) {
+            val list = mutableListOf<MessageChannels>()
+            forEach { channel ->
+                list.add(MessageChannels(message.id, channel.id, channel.name))
+            }
+            list
+        } else null
     }
 
-    private suspend fun createMentionRelations(message: Message): List<BaseMessageEntity>? {
-        if (message.mentions == null || message.mentions!!.isEmpty()) {
-            return null
-        }
-
-        val list = mutableListOf<MessageMentionsRelation>()
-        message.mentions!!.filterNot { user -> user.id.isNullOrEmpty() }.forEach { mention ->
-            insertUserIfMissing(mention)
-            list.add(MessageMentionsRelation(message.id, mention.id!!))
-        }
-
-        return list
+    private suspend fun createMentionRelations(message: Message): List<BaseMessageEntity>? = message.mentions?.run {
+        if (isNotEmpty()) {
+            val list = mutableListOf<MessageMentionsRelation>()
+            filterNot { user -> user.id.isNullOrEmpty() }.forEach { mention ->
+                insertUserIfMissing(mention)
+                list.add(MessageMentionsRelation(message.id, mention.id!!))
+            }
+            list
+        } else null
     }
 
-    private suspend fun createFavoriteRelations(message: Message): List<BaseMessageEntity>? {
-        if (message.starred == null || message.starred!!.isEmpty()) {
-            return null
-        }
-
-        val list = mutableListOf<MessageFavoritesRelation>()
-        message.starred!!.filterNot { user -> user.id.isNullOrEmpty() }.forEach { userId ->
-            insertUserIfMissing(userId)
-            list.add(MessageFavoritesRelation(message.id, userId.id!!))
-        }
-
-        return list
+    private suspend fun createFavoriteRelations(message: Message): List<BaseMessageEntity>? = message.starred?.run {
+        if (isNotEmpty()) {
+            val list = mutableListOf<MessageFavoritesRelation>()
+            filterNot { user -> user.id.isNullOrEmpty() }.forEach { userId ->
+                insertUserIfMissing(userId)
+                list.add(MessageFavoritesRelation(message.id, userId.id!!))
+            }
+            list
+        } else null
     }
 
-    private fun createAttachments(message: Message): List<BaseMessageEntity>? {
-        if (message.attachments == null || message.attachments!!.isEmpty()) {
-            return null
-        }
-
-        val list = ArrayList<BaseMessageEntity>(message.attachments!!.size)
 
-        message.attachments!!.forEach { attachment ->
-            list.addAll(attachment.asEntity(message.id, context))
-        }
-
-        return list
+    private fun createAttachments(message: Message): List<BaseMessageEntity>? = message.attachments?.run {
+        if (isNotEmpty()) {
+            val list = ArrayList<BaseMessageEntity>(size)
+            forEach { attachment ->
+                list.addAll(attachment.asEntity(message.id, context))
+            }
+            list
+        } else null
     }
 
     private suspend fun createUpdates(): List<ChatRoomEntity> {
@@ -375,20 +358,15 @@ class DatabaseManager(val context: Application, val serverUrl: String) {
         }
     }
 
-    private fun mapLastMessageText(message: Message?): String? {
-        return if (message == null) {
-            null
+    private fun mapLastMessageText(message: Message?): String? = message?.run {
+        if (this.message.isEmpty() && attachments?.isNotEmpty() == true) {
+            message.attachments?.let { mapAttachmentText(it[0]) }
         } else {
-            return if (message.message.isEmpty() && message.attachments?.isNotEmpty() == true) {
-                mapAttachmentText(message.attachments!![0])
-            } else {
-                message.message
-            }
+            this.message
         }
     }
 
-    private fun mapAttachmentText(attachment: Attachment): String =
-        context.getString(R.string.msg_sent_attachment)
+    private fun mapAttachmentText(attachment: Attachment): String = context.getString(R.string.msg_sent_attachment)
 
     private suspend fun updateSubscription(data: Subscription): ChatRoomEntity? {
         return retryDB("getRoom(${data.roomId}") { chatRoomDao().getSync(data.roomId) }?.let { current ->
@@ -431,12 +409,10 @@ class DatabaseManager(val context: Application, val serverUrl: String) {
         }
     }
 
-    private suspend fun insertChatRoom(data: BaseRoom): ChatRoomEntity? {
-        return when (data) {
-            is Room -> insertRoom(data)
-            is Subscription -> insertSubscription(data)
-            else -> null
-        }
+    private suspend fun insertChatRoom(data: BaseRoom): ChatRoomEntity? = when (data) {
+        is Room -> insertRoom(data)
+        is Subscription -> insertSubscription(data)
+        else -> null
     }
 
     private suspend fun insertRoom(data: Room): ChatRoomEntity? {

app/src/main/java/chat/rocket/android/db/model/Attachments.kt

@@ -115,12 +115,12 @@ fun Attachment.asEntity(msgId: String, context: Context): List<BaseMessageEntity
 
     val text = mapAttachmentText(text, attachments?.firstOrNull(), context)
 
-    val entity = AttachmentEntity(
+    list.add(AttachmentEntity(
             _id = attachmentId,
             messageId = msgId,
             title = title,
             type = type,
-            description =  description,
+            description = description,
             text = text,
             titleLink = titleLink,
             titleLinkDownload = titleLinkDownload.orFalse(),
@@ -144,16 +144,14 @@ fun Attachment.asEntity(msgId: String, context: Context): List<BaseMessageEntity
             buttonAlignment = buttonAlignment,
             hasActions = actions?.isNotEmpty() == true,
             hasFields = fields?.isNotEmpty() == true
-    )
-    list.add(entity)
+    ))
 
     fields?.forEach { field ->
-        val entity = AttachmentFieldEntity(
+        list.add(AttachmentFieldEntity(
                 attachmentId = attachmentId,
                 title = field.title,
                 value = field.value
-        )
-        list.add(entity)
+        ))
     }
 
     actions?.forEach { action ->
@@ -175,18 +173,14 @@ fun Attachment.asEntity(msgId: String, context: Context): List<BaseMessageEntity
     return list
 }
 
-fun mapAttachmentText(text: String?, attachment: Attachment?, context: Context): String? {
-    return if (attachment != null) {
-        when {
-            attachment.imageUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_photo)
-            attachment.videoUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_video)
-            attachment.audioUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_audio)
-            attachment.titleLink.isNotNullNorEmpty() &&
-                    attachment.type?.contentEquals("file") == true ->
-                context.getString(R.string.msg_preview_file)
-            else -> text
-        }
-    } else {
-        text
+fun mapAttachmentText(text: String?, attachment: Attachment?, context: Context): String?  = attachment?.run {
+    when {
+        imageUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_photo)
+        videoUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_video)
+        audioUrl.isNotNullNorEmpty() -> context.getString(R.string.msg_preview_audio)
+        titleLink.isNotNullNorEmpty() &&
+                type?.contentEquals("file") == true ->
+            context.getString(R.string.msg_preview_file)
+        else -> text
     }
-}
+} ?: text
\ No newline at end of file

app/src/main/java/chat/rocket/android/favoritemessages/presentation/FavoriteMessagesPresenter.kt

@@ -36,8 +36,7 @@ class FavoriteMessagesPresenter @Inject constructor(
             try {
                 view.showLoading()
                 dbManager.getRoom(roomId)?.let {
-                    val favoriteMessages =
-                            client.getFavoriteMessages(roomId, roomTypeOf(it.chatRoom.type), offset)
+                    val favoriteMessages = client.getFavoriteMessages(roomId, roomTypeOf(it.chatRoom.type), offset)
                     val messageList = mapper.map(favoriteMessages.result, asNotReversed = true)
                     view.showFavoriteMessages(messageList)
                     offset += 1 * 30

app/src/main/java/chat/rocket/android/favoritemessages/ui/FavoriteMessagesFragment.kt

@@ -25,11 +25,9 @@ import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_favorite_messages.*
 import javax.inject.Inject
 
-fun newInstance(chatRoomId: String): Fragment {
-    return FavoriteMessagesFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(INTENT_CHAT_ROOM_ID, chatRoomId)
-        }
+fun newInstance(chatRoomId: String): Fragment = FavoriteMessagesFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(INTENT_CHAT_ROOM_ID, chatRoomId)
     }
 }
 
@@ -48,12 +46,9 @@ class FavoriteMessagesFragment : Fragment(), FavoriteMessagesView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(INTENT_CHAT_ROOM_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(INTENT_CHAT_ROOM_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/files/ui/FilesFragment.kt

@@ -30,11 +30,9 @@ import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_files.*
 import javax.inject.Inject
 
-fun newInstance(chatRoomId: String): Fragment {
-    return FilesFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-        }
+fun newInstance(chatRoomId: String): Fragment = FilesFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
     }
 }
 
@@ -55,12 +53,9 @@ class FilesFragment : Fragment(), FilesView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/helper/AndroidPermissionsHelper.kt

@@ -11,8 +11,7 @@ object AndroidPermissionsHelper {
     const val WRITE_EXTERNAL_STORAGE_CODE = 1
 
     fun checkPermission(context: Context, permission: String): Boolean {
-        return ContextCompat.checkSelfPermission(context, permission) ==
-            PackageManager.PERMISSION_GRANTED
+        return ContextCompat.checkSelfPermission(context, permission) == PackageManager.PERMISSION_GRANTED
     }
 
     fun requestPermission(context: Activity, permission: String, requestCode: Int) {

app/src/main/java/chat/rocket/android/helper/ImageHelper.kt

@@ -53,8 +53,8 @@ object ImageHelper {
         )
         val toolbar = Toolbar(context).also {
             it.inflateMenu(R.menu.image_actions)
-            it.setOnMenuItemClickListener {
-                return@setOnMenuItemClickListener when (it.itemId) {
+            it.setOnMenuItemClickListener { view ->
+                return@setOnMenuItemClickListener when (view.itemId) {
                     R.id.action_save_image -> saveImage(context)
                     else -> true
                 }
@@ -62,20 +62,24 @@ object ImageHelper {
 
             val titleSize = context.resources
                 .getDimensionPixelSize(R.dimen.viewer_toolbar_title)
-            val titleTextView = TextView(context).also {
-                it.text = imageName
-                it.setTextColor(Color.WHITE)
-                it.setTextSize(TypedValue.COMPLEX_UNIT_PX, titleSize.toFloat())
-                it.ellipsize = TextUtils.TruncateAt.END
-                it.setSingleLine()
-                it.typeface = Typeface.DEFAULT_BOLD
-                it.setPadding(pad)
+            val titleTextView = TextView(context).also { tv ->
+                with(tv) {
+                    text = imageName
+                    setTextColor(Color.WHITE)
+                    setTextSize(TypedValue.COMPLEX_UNIT_PX, titleSize.toFloat())
+                    ellipsize = TextUtils.TruncateAt.END
+                    setSingleLine()
+                    typeface = Typeface.DEFAULT_BOLD
+                    setPadding(pad)
+                }
             }
 
-            val backArrowView = ImageView(context).also {
-                it.setImageResource(R.drawable.ic_arrow_back_white_24dp)
-                it.setOnClickListener { imageViewer?.onDismiss() }
-                it.setPadding(0, pad, pad, pad)
+            val backArrowView = ImageView(context).also { imgView ->
+                with(imgView) {
+                    setImageResource(R.drawable.ic_arrow_back_white_24dp)
+                    setOnClickListener { imageViewer?.onDismiss() }
+                    setPadding(0, pad, pad, pad)
+                }
             }
 
             val layoutParams = AppBarLayout.LayoutParams(
@@ -88,14 +92,16 @@ object ImageHelper {
         }
 
         val appBarLayout = AppBarLayout(context).also {
-            it.layoutParams = lparams
-            it.setBackgroundColor(Color.BLACK)
-            it.addView(
-                toolbar, AppBarLayout.LayoutParams(
-                    AppBarLayout.LayoutParams.MATCH_PARENT,
-                    ViewGroup.LayoutParams.WRAP_CONTENT
+            with(it) {
+                layoutParams = lparams
+                setBackgroundColor(Color.BLACK)
+                addView(
+                        toolbar, AppBarLayout.LayoutParams(
+                        AppBarLayout.LayoutParams.MATCH_PARENT,
+                        ViewGroup.LayoutParams.WRAP_CONTENT
                 )
-            )
+                )
+            }
         }
 
         val builder = ImageViewer.createPipelineDraweeControllerBuilder()

app/src/main/java/chat/rocket/android/members/adapter/MembersAdapter.kt

@@ -10,8 +10,9 @@ import chat.rocket.android.util.extensions.inflate
 import kotlinx.android.synthetic.main.avatar.view.*
 import kotlinx.android.synthetic.main.item_member.view.*
 
-class MembersAdapter(private val listener: (MemberUiModel) -> Unit) :
-    RecyclerView.Adapter<MembersAdapter.ViewHolder>() {
+class MembersAdapter(
+    private val listener: (MemberUiModel) -> Unit
+) : RecyclerView.Adapter<MembersAdapter.ViewHolder>() {
     private var dataSet: List<MemberUiModel> = ArrayList()
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MembersAdapter.ViewHolder =
@@ -43,7 +44,8 @@ class MembersAdapter(private val listener: (MemberUiModel) -> Unit) :
         fun bind(memberUiModel: MemberUiModel, listener: (MemberUiModel) -> Unit) = with(itemView) {
             image_avatar.setImageURI(memberUiModel.avatarUri)
             text_member.content = memberUiModel.displayName
-            text_member.setCompoundDrawablesRelativeWithIntrinsicBounds(DrawableHelper.getUserStatusDrawable(memberUiModel.status, context), null, null, null)
+            text_member.setCompoundDrawablesRelativeWithIntrinsicBounds(
+                    DrawableHelper.getUserStatusDrawable(memberUiModel.status, context), null, null, null)
             setOnClickListener { listener(memberUiModel) }
         }
     }

app/src/main/java/chat/rocket/android/members/ui/MembersFragment.kt

@@ -27,11 +27,9 @@ import kotlinx.android.synthetic.main.app_bar_chat_room.*
 import kotlinx.android.synthetic.main.fragment_members.*
 import javax.inject.Inject
 
-fun newInstance(chatRoomId: String): Fragment {
-    return MembersFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-        }
+fun newInstance(chatRoomId: String): Fragment = MembersFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
     }
 }
 
@@ -52,12 +50,9 @@ class MembersFragment : Fragment(), MembersView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(
@@ -80,7 +75,7 @@ class MembersFragment : Fragment(), MembersView {
             setupToolbar(total)
             if (adapter.itemCount == 0) {
                 adapter.prependData(dataSet)
-                if (dataSet.size >= 59) { // TODO Check why the API retorns the specified count -1
+                if (dataSet.size >= 59) { // TODO Check why the API returns the specified count -1
                     recycler_view.addOnScrollListener(object :
                         EndlessRecyclerViewScrollListener(linearLayoutManager) {
                         override fun onLoadMore(

app/src/main/java/chat/rocket/android/mentions/ui/MentionsFragment.kt

@@ -25,11 +25,9 @@ import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_mentions.*
 import javax.inject.Inject
 
-fun newInstance(chatRoomId: String): Fragment {
-    return MentionsFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-        }
+fun newInstance(chatRoomId: String): Fragment = MentionsFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
     }
 }
 
@@ -48,12 +46,9 @@ class MentionsFragment : Fragment(), MentionsView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/pinnedmessages/ui/PinnedMessagesFragment.kt

@@ -25,11 +25,9 @@ import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_pinned_messages.*
 import javax.inject.Inject
 
-fun newInstance(chatRoomId: String): Fragment {
-    return PinnedMessagesFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
-        }
+fun newInstance(chatRoomId: String): Fragment = PinnedMessagesFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_CHAT_ROOM_ID, chatRoomId)
     }
 }
 
@@ -48,12 +46,9 @@ class PinnedMessagesFragment : Fragment(), PinnedMessagesView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            chatRoomId = bundle.getString(BUNDLE_CHAT_ROOM_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            chatRoomId = getString(BUNDLE_CHAT_ROOM_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/profile/ui/ProfileFragment.kt

@@ -94,11 +94,13 @@ class ProfileFragment : Fragment(), ProfileView, ActionMode.Callback {
     }
 
     override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
-        if (resultData != null && resultCode == Activity.RESULT_OK) {
-            if (requestCode == REQUEST_CODE_FOR_PERFORM_SAF) {
-                presenter.updateAvatar(resultData.data)
-            } else if (requestCode == REQUEST_CODE_FOR_PERFORM_CAMERA) {
-                presenter.preparePhotoAndUpdateAvatar(resultData.extras["data"] as Bitmap)
+        resultData?.run {
+            if (resultCode == Activity.RESULT_OK) {
+                if (requestCode == REQUEST_CODE_FOR_PERFORM_SAF) {
+                    data?.let { presenter.updateAvatar(it) }
+                } else if (requestCode == REQUEST_CODE_FOR_PERFORM_CAMERA) {
+                    extras?.get("data")?.let { presenter.preparePhotoAndUpdateAvatar(it as Bitmap) }
+                }
             }
         }
     }
@@ -203,8 +205,7 @@ class ProfileFragment : Fragment(), ProfileView, ActionMode.Callback {
     }
 
     private fun setupToolbar() {
-        (activity as AppCompatActivity?)?.supportActionBar?.title =
-                getString(R.string.title_profile)
+        (activity as AppCompatActivity?)?.supportActionBar?.title = getString(R.string.title_profile)
     }
 
     private fun setupListeners() {

app/src/main/java/chat/rocket/android/push/PushManager.kt

@@ -12,13 +12,14 @@ import android.os.Build
 import android.os.Bundle
 import android.os.Parcel
 import android.os.Parcelable
+import android.text.Html
+import android.text.Spanned
 import androidx.annotation.RequiresApi
 import androidx.core.app.NotificationCompat
 import androidx.core.app.NotificationManagerCompat
 import androidx.core.app.RemoteInput
-import android.text.Html
-import android.text.Spanned
 import androidx.core.content.ContextCompat
+import androidx.core.text.HtmlCompat.FROM_HTML_MODE_LEGACY
 import chat.rocket.android.R
 import chat.rocket.android.main.ui.MainActivity
 import chat.rocket.android.server.domain.GetAccountInteractor
@@ -303,7 +304,11 @@ class PushManager @Inject constructor(
 
     // CharSequence extensions
     private fun CharSequence.fromHtml(): Spanned {
-        return Html.fromHtml(this as String)
+        return if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+            Html.fromHtml(this as String, FROM_HTML_MODE_LEGACY, null, null)
+        } else {
+            Html.fromHtml(this as String)
+        }
     }
 
     // NotificationCompat.Builder extensions
@@ -383,12 +388,12 @@ data class PushMessage(
 ) : Parcelable {
 
     constructor(parcel: Parcel) : this(
+        parcel.readString().orEmpty(),
+        parcel.readString().orEmpty(),
+        parcel.readParcelable(PushMessage::class.java.classLoader) ?: PushInfo.EMPTY,
         parcel.readString(),
         parcel.readString(),
-        parcel.readParcelable(PushMessage::class.java.classLoader),
-        parcel.readString(),
-        parcel.readString(),
-        parcel.readString(),
+        parcel.readString().orEmpty(),
         parcel.readString(),
         parcel.readString())
 
@@ -433,9 +438,9 @@ data class PushInfo @KotshiConstructor constructor(
     }
 
     constructor(parcel: Parcel) : this(
-        parcel.readString(),
-        parcel.readString(),
-        roomTypeOf(parcel.readString()),
+        parcel.readString().orEmpty(),
+        parcel.readString().orEmpty(),
+        roomTypeOf(parcel.readString().orEmpty()),
         parcel.readString(),
         parcel.readParcelable(PushInfo::class.java.classLoader))
 
@@ -481,7 +486,7 @@ data class PushSender @KotshiConstructor constructor(
     val name: String?
 ) : Parcelable {
     constructor(parcel: Parcel) : this(
-        parcel.readString(),
+        parcel.readString().orEmpty(),
         parcel.readString(),
         parcel.readString())
 

app/src/main/java/chat/rocket/android/server/infraestructure/ConnectionManager.kt

@@ -97,8 +97,8 @@ class ConnectionManager(
 
                         resubscribeRooms()
 
-                        temporaryStatus?.let { status ->
-                            client.setTemporaryStatus(status)
+                        temporaryStatus?.let { tempStatus ->
+                            client.setTemporaryStatus(tempStatus)
                         }
                     }
                     is State.Waiting -> {
@@ -135,9 +135,7 @@ class ConnectionManager(
                 if (it.type == Type.Updated) {
                     if (it.data is Room) {
                         val room = it.data as Room
-                        roomsChannels[it.data.id]?.let { channel ->
-                            channel.offer(room)
-                        }
+                        roomsChannels[it.data.id]?.offer(room)
                     }
                 }
             }
@@ -231,7 +229,7 @@ class ConnectionManager(
     }
 
     private fun resubscribeRooms() {
-        roomMessagesChannels.toList().map { (roomId, channel) ->
+        roomMessagesChannels.toList().map { (roomId, _) ->
             client.subscribeRoomMessages(roomId) { _, id ->
                 Timber.d("Subscribed to $roomId: $id")
                 subscriptionIdMap[roomId] = id

app/src/main/java/chat/rocket/android/server/infraestructure/DatabaseMessageMapper.kt

@@ -14,7 +14,6 @@ import chat.rocket.core.model.Message
 import chat.rocket.core.model.Reactions
 import chat.rocket.core.model.attachment.Attachment
 import chat.rocket.core.model.attachment.Color
-import chat.rocket.core.model.attachment.DEFAULT_COLOR_STR
 import chat.rocket.core.model.attachment.Field
 import chat.rocket.core.model.attachment.actions.Action
 import chat.rocket.core.model.attachment.actions.ButtonAction
@@ -153,7 +152,7 @@ class DatabaseMessageMapper(private val dbManager: DatabaseManager) {
                     null
                 }
 
-                val attachment = Attachment(
+                list.add(Attachment(
                         title = title,
                         type = type,
                         description = description,
@@ -179,10 +178,10 @@ class DatabaseMessageMapper(private val dbManager: DatabaseManager) {
                         authorLink = authorLink,
                         fields = fields,
                         fallback = fallback,
-                        buttonAlignment = if (actions != null && actions.isNotEmpty()) buttonAlignment ?: "vertical" else null,
+                        buttonAlignment = if (actions != null && actions.isNotEmpty()) buttonAlignment
+                                ?: "vertical" else null,
                         actions = actions
-                )
-                list.add(attachment)
+                ))
             }
         }
         return list

app/src/main/java/chat/rocket/android/server/infraestructure/DatabaseMessagesRepository.kt

@@ -46,8 +46,8 @@ class DatabaseMessagesRepository(
         dbManager.processMessagesBatch(listOf(message)).join()
     }
 
-    override suspend fun saveAll(messages: List<Message>) {
-        dbManager.processMessagesBatch(messages).join()
+    override suspend fun saveAll(newMessages: List<Message>) {
+        dbManager.processMessagesBatch(newMessages).join()
     }
 
     override suspend fun removeById(id: String) {
@@ -78,7 +78,7 @@ class DatabaseMessagesRepository(
 
     override suspend fun getLastSyncDate(roomId: String): Long? = withContext(CommonPool) {
         retryDB("getLastSync($roomId)") {
-            dbManager.messageDao().getLastSync(roomId)?.let { it.timestamp }
+            dbManager.messageDao().getLastSync(roomId)?.timestamp
         }
     }
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/server/infraestructure/SharedPreferencesAccountsRepository.kt

@@ -14,13 +14,8 @@ class SharedPreferencesAccountsRepository(
     private val moshi: Moshi
 ) : AccountsRepository {
 
-    override fun save(newAccount: Account) {
-        val accounts = load()
-
-        val newList = accounts.filter { account -> newAccount.serverUrl != account.serverUrl }
-            .toMutableList()
-        newList.add(0, newAccount)
-        save(newList)
+    override fun save(account: Account) {
+        save(load().filter { item -> item.serverUrl != item.serverUrl }.toMutableList().apply { add(0, account) })
     }
 
     override fun load(): List<Account> {
@@ -28,15 +23,11 @@ class SharedPreferencesAccountsRepository(
         val type = Types.newParameterizedType(List::class.java, Account::class.java)
         val adapter = moshi.adapter<List<Account>>(type)
 
-        return adapter.fromJson(json) ?: emptyList()
+        return json?.let { adapter.fromJson(it) ?: emptyList() } ?: emptyList()
     }
 
     override fun remove(serverUrl: String) {
-        val accounts = load()
-
-        val newList = accounts.filter { account -> serverUrl != account.serverUrl }
-            .toMutableList()
-        save(newList)
+        save(load().filter { account -> serverUrl != account.serverUrl }.toMutableList())
     }
 
     private fun save(accounts: List<Account>) {

app/src/main/java/chat/rocket/android/server/infraestructure/SharedPrefsBasicAuthRepository.kt

@@ -15,8 +15,7 @@ class SharedPrefsBasicAuthRepository(
 ) : BasicAuthRepository {
 
     override fun save(basicAuth: BasicAuth) {
-        val newList = load().filter { basicAuth -> basicAuth.host != basicAuth.host }
-            .toMutableList()
+        val newList = load().filter { auth -> auth.host != auth.host }.toMutableList()
         newList.add(0, basicAuth)
         save(newList)
     }
@@ -26,7 +25,7 @@ class SharedPrefsBasicAuthRepository(
         val type = Types.newParameterizedType(List::class.java, BasicAuth::class.java)
         val adapter = moshi.adapter<List<BasicAuth>>(type)
 
-        return adapter.fromJson(json) ?: emptyList()
+        return json?.let { adapter.fromJson(it) ?: emptyList() } ?: emptyList()
     }
 
     private fun save(basicAuths: List<BasicAuth>) {

app/src/main/java/chat/rocket/android/settings/password/ui/PasswordFragment.kt

@@ -106,18 +106,16 @@ class PasswordFragment : Fragment(), PasswordView, ActionMode.Callback {
 
     private fun finishActionMode() = actionMode?.finish()
 
-    private fun listenToChanges(): Disposable {
-        return Observables.combineLatest(
-            text_new_password.asObservable(),
-            text_confirm_password.asObservable()
-        ).subscribe {
-            val newPassword = it.first.toString()
-            val newPasswordConfirmation = it.second.toString()
-            if (newPassword.length > 5 && newPassword == newPasswordConfirmation) {
-                startActionMode()
-            } else {
-                finishActionMode()
-            }
+    private fun listenToChanges(): Disposable = Observables.combineLatest(
+        text_new_password.asObservable(),
+        text_confirm_password.asObservable()
+    ).subscribe {
+        val newPassword = it.first.toString()
+        val newPasswordConfirmation = it.second.toString()
+        if (newPassword.length > 5 && newPassword == newPasswordConfirmation) {
+            startActionMode()
+        } else {
+            finishActionMode()
         }
     }
 

app/src/main/java/chat/rocket/android/settings/ui/SettingsFragment.kt

@@ -115,8 +115,7 @@ class SettingsFragment : Fragment(), SettingsView, AdapterView.OnItemClickListen
     }
 
     private fun setupToolbar() {
-        (activity as AppCompatActivity?)?.supportActionBar?.title =
-                getString(R.string.title_settings)
+        (activity as AppCompatActivity?)?.supportActionBar?.title = getString(R.string.title_settings)
     }
 
     private fun shareApp() {

app/src/main/java/chat/rocket/android/userdetails/presentation/UserDetailsPresenter.kt

@@ -40,7 +40,7 @@ class UserDetailsPresenter @Inject constructor(
                 dbManager.getUser(userId)?.let {
                     userEntity = it
                     val avatarUrl =
-                        userEntity.username?.let { currentServer.avatarUrl(avatar = it) }
+                        userEntity.username?.let { username -> currentServer.avatarUrl(avatar = username) }
                     val username = userEntity.username
                     val name = userEntity.name
                     val utcOffset =

app/src/main/java/chat/rocket/android/userdetails/ui/UserDetailsFragment.kt

@@ -29,11 +29,9 @@ import kotlinx.android.synthetic.main.app_bar_chat_room.*
 import kotlinx.android.synthetic.main.fragment_user_details.*
 import javax.inject.Inject
 
-fun newInstance(userId: String): Fragment {
-    return UserDetailsFragment().apply {
-        arguments = Bundle(1).apply {
-            putString(BUNDLE_USER_ID, userId)
-        }
+fun newInstance(userId: String): Fragment = UserDetailsFragment().apply {
+    arguments = Bundle(1).apply {
+        putString(BUNDLE_USER_ID, userId)
     }
 }
 
@@ -52,12 +50,9 @@ class UserDetailsFragment : Fragment(), UserDetailsView {
         super.onCreate(savedInstanceState)
         AndroidSupportInjection.inject(this)
 
-        val bundle = arguments
-        if (bundle != null) {
-            userId = bundle.getString(BUNDLE_USER_ID)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            userId = getString(BUNDLE_USER_ID, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(

app/src/main/java/chat/rocket/android/util/HttpLoggingInterceptor.kt

@@ -191,7 +191,7 @@ class HttpLoggingInterceptor constructor(private val logger: Logger) : Intercept
 
         val responseBody = response.body()
         val contentLength = responseBody!!.contentLength()
-        val bodySize = if (contentLength != -1L) contentLength.toString() + "-byte" else "unknown-length"
+        val bodySize = if (contentLength != -1L) "$contentLength-byte" else "unknown-length"
         val responseStr = if (response.message().isEmpty()) "" else " ${response.message()}"
         logger.log("<-- ${response.code()}$responseStr ${response.request().url()}"
                 + " (" + tookMs + "ms" + (if (!logHeaders) ", $bodySize body" else "") + ')'.toString())

app/src/main/java/chat/rocket/android/util/extensions/String.kt

@@ -69,11 +69,8 @@ fun String.userId(userId: String?): String? {
     return userId?.let { this.replace(it, "") }
 }
 
-fun String.lowercaseUrl(): String? {
-    val httpUrl = HttpUrl.parse(this)
-    val newScheme = httpUrl?.scheme()?.toLowerCase()
-
-    return httpUrl?.newBuilder()?.scheme(newScheme)?.build()?.toString()
+fun String.lowercaseUrl(): String? = HttpUrl.parse(this)?.run {
+    newBuilder().scheme(scheme().toLowerCase()).build().toString()
 }
 
 fun String?.isNotNullNorEmpty(): Boolean = this != null && this.isNotEmpty()

app/src/main/java/chat/rocket/android/util/extensions/Ui.kt

@@ -80,12 +80,10 @@ fun AppCompatActivity.toPreviousView() {
 }
 
 fun Activity.hideKeyboard() {
-    if (currentFocus != null) {
-        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
-        imm.hideSoftInputFromWindow(
-            currentFocus.windowToken,
-            InputMethodManager.RESULT_UNCHANGED_SHOWN
-        )
+    currentFocus?.run {
+        (getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager).also {
+            it.hideSoftInputFromWindow(windowToken, InputMethodManager.RESULT_UNCHANGED_SHOWN)
+        }
     }
 }
 

app/src/main/java/chat/rocket/android/util/extensions/Uri.kt

@@ -51,7 +51,7 @@ fun Uri.getFileSize(context: Context): Int {
 
 fun Uri.getMimeType(context: Context): String {
     return if (scheme == ContentResolver.SCHEME_CONTENT) {
-        context.contentResolver.getType(this)
+        context.contentResolver?.getType(this) ?: ""
     } else {
         val fileExtension = MimeTypeMap.getFileExtensionFromUrl(toString())
         if (fileExtension != null) {

app/src/main/java/chat/rocket/android/webview/adminpanel/ui/AdminPanelWebViewFragment.kt

@@ -27,13 +27,10 @@ class AdminPanelWebViewFragment : DaggerFragment() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        val bundle = arguments
-        if (bundle != null) {
-            webPageUrl = bundle.getString(BUNDLE_WEB_PAGE_URL)
-            userToken = bundle.getString(BUNDLE_USER_TOKEN)
-        } else {
-            requireNotNull(bundle) { "no arguments supplied when the fragment was instantiated" }
-        }
+        arguments?.run {
+            webPageUrl = getString(BUNDLE_WEB_PAGE_URL, "")
+            userToken = getString(BUNDLE_USER_TOKEN, "")
+        } ?: requireNotNull(arguments) { "no arguments supplied when the fragment was instantiated" }
     }
 
     override fun onCreateView(
@@ -65,7 +62,7 @@ class AdminPanelWebViewFragment : DaggerFragment() {
         web_view.webViewClient = object : WebViewClient() {
             override fun onPageFinished(view: WebView, url: String) {
                 super.onPageFinished(view, url)
-                ui { _ ->
+                ui {
                     view_loading.hide()
                     web_view.evaluateJavascript("Meteor.loginWithToken('$userToken', function() { })") {}
                 }

app/src/main/java/chat/rocket/android/widget/DividerItemDecoration.kt

@@ -14,7 +14,7 @@ import androidx.recyclerview.widget.RecyclerView
  * @see RecyclerView.ItemDecoration
  */
 class DividerItemDecoration() : RecyclerView.ItemDecoration() {
-    private lateinit var divider: Drawable
+    private var divider: Drawable? = null
     private var boundStart = 0
     private var boundEnd = 0
 
@@ -39,10 +39,7 @@ class DividerItemDecoration() : RecyclerView.ItemDecoration() {
 
     // Custom divider will be used.
     constructor(context: Context, @DrawableRes drawableResId: Int) : this() {
-        val customDrawable = ContextCompat.getDrawable(context, drawableResId)
-        if (customDrawable != null) {
-            divider = customDrawable
-        }
+        divider = ContextCompat.getDrawable(context, drawableResId)
     }
 
     override fun onDraw(c: Canvas, parent: RecyclerView, state: RecyclerView.State) {
@@ -59,10 +56,10 @@ class DividerItemDecoration() : RecyclerView.ItemDecoration() {
             val params = child.layoutParams as RecyclerView.LayoutParams
 
             val top = child.bottom + params.bottomMargin
-            val bottom = top + divider.intrinsicHeight
+            val bottom = top + (divider?.intrinsicHeight ?: 0)
 
-            divider.setBounds(left, top, right, bottom)
-            divider.draw(c)
+            divider?.setBounds(left, top, right, bottom)
+            divider?.draw(c)
         }
     }
 

util/src/main/java/chat/rocket/android/util/extension/Widget.kt

 package chat.rocket.android.util.extension
 
+import android.content.Context
+import android.os.Build
+import android.widget.TextView
 import androidx.appcompat.widget.SearchView
 
 fun SearchView.onQueryTextListener(queryListener: (String) -> Unit) {
@@ -14,4 +17,12 @@ fun SearchView.onQueryTextListener(queryListener: (String) -> Unit) {
             return true
         }
     })
+}
+
+fun TextView.setTextViewAppearance(context: Context, style: Int) {
+    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+        setTextAppearance(style)
+    } else {
+        setTextAppearance(context, style)
+    }
 }
\ No newline at end of file