makes suggested changes

app/build.gradle

@@ -57,6 +57,7 @@ dependencies {
     implementation libraries.kotlin
     implementation libraries.coroutines
     implementation libraries.coroutinesAndroid
+
     implementation libraries.appCompat
     implementation libraries.recyclerview
     implementation libraries.design
@@ -64,6 +65,7 @@ dependencies {
     implementation libraries.cardView
     implementation libraries.flexbox
     implementation libraries.customTabs
+    implementation libraries.supportv4
 
     implementation libraries.androidKtx
 

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

@@ -532,8 +532,8 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardListener, EmojiR
 
     override fun onNonEmojiKeyPressed(keyCode: Int) {
         when (keyCode) {
-            KeyEvent.KEYCODE_BACK -> with(text_message) {
-                if (selectionStart > 0) text!!.delete(selectionStart - 1, selectionStart)
+            KeyEvent.KEYCODE_BACK -> {
+                if (text_message.selectionStart > 0) text_message.text!!.delete(text_message.selectionStart - 1, text_message.selectionStart)
             }
             else -> throw IllegalArgumentException("pressed key not expected")
         }

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

@@ -80,7 +80,7 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
 
         setupToolbar()
         setupRecyclerView()
-        setUpFAB()
+        setupFab()
         presenter.loadChatRooms()
     }
 
@@ -289,7 +289,7 @@ class ChatRoomsFragment : Fragment(), ChatRoomsView {
         sectionedAdapter?.setSections(sections.toArray(dummy))
     }
 
-    private fun setUpFAB() {
+    private fun setupFab() {
         create_new_channel_fab.setOnClickListener {
             val intent = Intent(activity, CreateNewChannelActivity::class.java)
             startActivity(intent)

app/src/main/java/chat/rocket/android/createChannel/addMembers/presentation/AddMembersView.kt

@@ -7,6 +7,7 @@ import chat.rocket.android.members.viewmodel.MemberViewModel
 interface AddMembersView : LoadingView, MessageView {
     /**
      * Show members on the basis of query
+     *
      * @param dataSet The list of members
      * @param total The number of members returned
      */

app/src/main/java/chat/rocket/android/createChannel/addMembers/ui/AddMembersActivity.kt

@@ -10,6 +10,7 @@ import android.support.v7.widget.RecyclerView
 import android.view.MenuItem
 import android.widget.EditText
 import android.widget.Toast
+import androidx.core.view.isVisible
 import chat.rocket.android.R
 import chat.rocket.android.createChannel.addMembers.presentation.AddMembersPresenter
 import chat.rocket.android.createChannel.addMembers.presentation.AddMembersView
@@ -43,8 +44,7 @@ class AddMembersActivity : AppCompatActivity(), AddMembersView {
             updateToolBar()
             search_view.setText("")
         } else {
-            Toast.makeText(this, getString(R.string.msg_member_already_added), Toast.LENGTH_LONG)
-                .show()
+            showMessage(getString(R.string.msg_member_already_added))
         }
     }
     private lateinit var observableForSearchView: Disposable
@@ -59,11 +59,15 @@ class AddMembersActivity : AppCompatActivity(), AddMembersView {
         setUpRecyclerView()
         setOnClickListeners()
         setInitialChips()
+    }
+
+    override fun onStart() {
+        super.onStart()
         setUpObservableForSearchView()
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
+    override fun onStop() {
+        super.onStop()
         //dispose off the rx disposables
         observableForToolbarAction.dispose()
         observableForSearchView.dispose()
@@ -102,11 +106,11 @@ class AddMembersActivity : AppCompatActivity(), AddMembersView {
     }
 
     override fun showLoading() {
-        progress_bar.setVisible(true)
+        view_loading.isVisible = true
     }
 
     override fun hideLoading() {
-        progress_bar.setVisible(false)
+        view_loading.isVisible = false
     }
 
     override fun showMessage(resId: Int) {

app/src/main/java/chat/rocket/android/createChannel/presentation/CreateNewChannelPresenter.kt

@@ -11,7 +11,6 @@ import chat.rocket.core.RocketChatClient
 import chat.rocket.core.internal.rest.createChannel
 import javax.inject.Inject
 
-
 class CreateNewChannelPresenter @Inject constructor(
     private val view: CreateNewChannelView,
     private val strategy: CancelStrategy,

app/src/main/java/chat/rocket/android/createChannel/presentation/CreateNewChannelView.kt

@@ -3,20 +3,28 @@ package chat.rocket.android.createChannel.presentation
 import chat.rocket.android.core.behaviours.LoadingView
 
 interface CreateNewChannelView : LoadingView {
-    /*
-    Show a message that a channel was successfully created
+    /**
+     * Show a message that a channel was successfully created
      */
     fun showChannelCreatedSuccessfullyMessage()
 
-    /*
-    Show message and clear text in edit text
+    /**
+     * Show message and clear text in edit text
+     *
+     * @param resId Resource id of the message to be shown
      */
     fun showMessageAndClearText(resId: Int)
 
+    /**
+     * Show message and clear text in edit text
+     *
+     * @param message Toast message to be shown
+     */
+
     fun showMessageAndClearText(message: String)
 
-    /*
-    Show error message
+    /**
+     * Show error message
      */
     fun showErrorMessage()
 

app/src/main/java/chat/rocket/android/createChannel/ui/CreateNewChannelActivity.kt

@@ -7,6 +7,7 @@ import android.os.Bundle
 import android.support.design.chip.Chip
 import android.support.v7.app.AppCompatActivity
 import android.view.MenuItem
+import androidx.core.view.isVisible
 import chat.rocket.android.R
 import chat.rocket.android.createChannel.addMembers.ui.AddMembersActivity
 import chat.rocket.android.createChannel.presentation.CreateNewChannelPresenter
@@ -38,8 +39,13 @@ class CreateNewChannelActivity : AppCompatActivity(), CreateNewChannelView {
         setUpOnClickListeners()
     }
 
-    override fun onDestroy() {
-        super.onDestroy()
+    override fun onStart() {
+        super.onStart()
+        setUpToolbarObservable()
+    }
+
+    override fun onStop() {
+        super.onStop()
         observableForToolbarAction.dispose()
     }
 
@@ -66,13 +72,13 @@ class CreateNewChannelActivity : AppCompatActivity(), CreateNewChannelView {
     }
 
     override fun showLoading() {
-        view_loading.setVisible(true)
+        view_loading.isVisible = true
         layout_container.alpha = 0.5f
         layout_container.isEnabled = false
     }
 
     override fun hideLoading() {
-        view_loading.setVisible(false)
+        view_loading.isVisible = false
         layout_container.alpha = 1.0f
         layout_container.isEnabled = true
     }
@@ -96,7 +102,6 @@ class CreateNewChannelActivity : AppCompatActivity(), CreateNewChannelView {
         showMessageAndClearText(getString(R.string.msg_generic_error))
     }
 
-
     private fun refreshMembersChips() {
         for (element in listOfUsers) {
             val memberChip = Chip(this)
@@ -114,6 +119,9 @@ class CreateNewChannelActivity : AppCompatActivity(), CreateNewChannelView {
         toolbar_action_text.text = getString(R.string.action_create_new_channel)
 
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
+    }
+
+    private fun setUpToolbarObservable(){
         observableForToolbarAction =
                 RxTextView.textChanges(channel_name_edit_text).subscribe { text ->
                     toolbar_action_text.isEnabled = (text.isNotEmpty() && listOfUsers.isNotEmpty())

app/src/main/res/layout/activity_add_members.xml

@@ -33,7 +33,7 @@
         </android.support.design.chip.ChipGroup>
 
         <com.wang.avi.AVLoadingIndicatorView
-            android:id="@+id/progress_bar"
+            android:id="@+id/view_loading"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:visibility="gone"

dependencies.gradle

@@ -56,7 +56,7 @@ ext {
             cardView              : "com.android.support:cardview-v7:${versions.support}",
             flexbox               : "com.google.android:flexbox:${versions.flexbox}",
             customTabs            : "com.android.support:customtabs:${versions.support}",
-
+            supportv4             : "com.android.support:support-v4:${versions.support}",
             androidKtx            : "androidx.core:core-ktx:${versions.androidKtx}",
 
             dagger                : "com.google.dagger:dagger:${versions.dagger}",