Improves the Google For Smart Lock feature on the app.

app/src/main/java/chat/rocket/android/authentication/login/presentation/LoginPresenter.kt

@@ -55,7 +55,6 @@ class LoginPresenter @Inject constructor(
     private lateinit var credentialSecret: String
     private lateinit var deepLinkUserId: String
     private lateinit var deepLinkToken: String
-    private var loginCredentials: Credential? = null
 
     fun setupView() {
         setupConnectionInfo(currentServer)
@@ -330,10 +329,7 @@ class LoginPresenter @Inject constructor(
                     saveToken(token)
                     registerPushToken()
                     if (loginType == TYPE_LOGIN_USER_EMAIL) {
-                        loginCredentials = Credential.Builder(usernameOrEmail)
-                            .setPassword(password)
-                            .build()
-                        view.saveSmartLockCredentials(loginCredentials)
+                        view.saveSmartLockCredentials(usernameOrEmail, password)
                     }
                     navigator.toChatList()
                 } else if (loginType == TYPE_LOGIN_OAUTH) {

app/src/main/java/chat/rocket/android/authentication/login/presentation/LoginView.kt

@@ -226,7 +226,7 @@ interface LoginView : LoadingView, MessageView {
     fun alertWrongPassword()
 
     /**
-     * Save credentials via google smart lock
+     * Saves Google Smart Lock credentials.
      */
-    fun saveSmartLockCredentials(loginCredential: Credential?)
+    fun saveSmartLockCredentials(id: String, password: String)
 }
\ No newline at end of file

app/src/main/java/chat/rocket/android/authentication/signup/presentation/SignupPresenter.kt

@@ -15,7 +15,6 @@ import chat.rocket.core.internal.rest.login
 import chat.rocket.core.internal.rest.me
 import chat.rocket.core.internal.rest.signup
 import chat.rocket.core.model.Myself
-import com.google.android.gms.auth.api.credentials.Credential
 import javax.inject.Inject
 
 class SignupPresenter @Inject constructor(
@@ -64,10 +63,7 @@ class SignupPresenter @Inject constructor(
                         localRepository.save(LocalRepository.CURRENT_USERNAME_KEY, me.username)
                         saveAccount(me)
                         registerPushToken()
-                        val loginCredentials = Credential.Builder(email)
-                            .setPassword(password)
-                            .build()
-                        view.saveSmartLockCredentials(loginCredentials)
+                        view.saveSmartLockCredentials(username, password)
                         navigator.toChatList()
                     } catch (exception: RocketChatException) {
                         exception.message?.let {

app/src/main/java/chat/rocket/android/authentication/signup/presentation/SignupView.kt

@@ -27,7 +27,7 @@ interface SignupView : LoadingView, MessageView {
     fun alertBlankEmail()
 
     /**
-     * Save credentials via google smart lock
+     * Saves Google Smart Lock credentials.
      */
-    fun saveSmartLockCredentials(loginCredential: Credential)
+    fun saveSmartLockCredentials(id: String, password: String)
 }
\ No newline at end of file

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

 package chat.rocket.android.authentication.signup.ui
 
 import DrawableHelper
-import android.app.Activity.RESULT_OK
+import android.app.Activity
 import android.content.Intent
 import android.os.Build
 import android.os.Bundle
@@ -11,30 +11,24 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import android.view.ViewTreeObserver
-import android.widget.Toast
 import chat.rocket.android.R
-import chat.rocket.android.authentication.login.ui.googleApiClient
+import chat.rocket.android.R.string.message_credentials_saved_successfully
 import chat.rocket.android.authentication.signup.presentation.SignupPresenter
 import chat.rocket.android.authentication.signup.presentation.SignupView
 import chat.rocket.android.helper.KeyboardHelper
+import chat.rocket.android.helper.SmartLockHelper
 import chat.rocket.android.helper.TextHelper
 import chat.rocket.android.util.extensions.*
-import com.google.android.gms.auth.api.Auth
-import com.google.android.gms.auth.api.credentials.Credential
-import com.google.android.gms.common.api.ResolvingResultCallbacks
-import com.google.android.gms.common.api.Status
+import com.google.android.gms.auth.api.credentials.Credentials
 import dagger.android.support.AndroidSupportInjection
 import kotlinx.android.synthetic.main.fragment_authentication_sign_up.*
-import timber.log.Timber
 import javax.inject.Inject
 
 internal const val SAVE_CREDENTIALS = 1
 
 class SignupFragment : Fragment(), SignupView {
-
     @Inject
     lateinit var presenter: SignupPresenter
-    private lateinit var credentialsToBeSaved: Credential
     private val layoutListener = ViewTreeObserver.OnGlobalLayoutListener {
         if (KeyboardHelper.isSoftKeyboardShown(relative_layout.rootView)) {
             bottom_container.setVisible(false)
@@ -120,44 +114,16 @@ class SignupFragment : Fragment(), SignupView {
         }
     }
 
-    override fun saveSmartLockCredentials(loginCredential: Credential) {
-        credentialsToBeSaved = loginCredential
-        googleApiClient.let {
-            if (it.isConnected) {
-                saveCredentials()
-            }
-        }
-    }
-
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
-        if (requestCode == SAVE_CREDENTIALS) {
-            if (resultCode == RESULT_OK) {
-                Toast.makeText(
-                    context,
-                    getString(R.string.message_credentials_saved_successfully),
-                    Toast.LENGTH_SHORT
-                ).show()
-            } else {
-                Timber.e("ERROR: Cancelled by user")
+        if (resultCode == Activity.RESULT_OK) {
+            if (data != null) {
+                if (requestCode == SAVE_CREDENTIALS) {
+                    showMessage(getString(message_credentials_saved_successfully))
+                }
             }
         }
     }
 
-    private fun saveCredentials() {
-        activity?.let {
-            Auth.CredentialsApi.save(googleApiClient, credentialsToBeSaved).setResultCallback(
-                object : ResolvingResultCallbacks<Status>(it, SAVE_CREDENTIALS) {
-                    override fun onSuccess(status: Status) {
-                        Timber.d("save:SUCCESS:$status")
-                    }
-
-                    override fun onUnresolvableFailure(status: Status) {
-                        Timber.e("save:FAILURE:$status")
-                    }
-                })
-        }
-    }
-
     override fun showLoading() {
         ui {
             enableUserInput(false)
@@ -188,6 +154,12 @@ class SignupFragment : Fragment(), SignupView {
         showMessage(getString(R.string.msg_generic_error))
     }
 
+    override fun saveSmartLockCredentials(id: String, password: String) {
+        activity?.let {
+            SmartLockHelper.save(Credentials.getClient(it), it, id, password)
+        }
+    }
+
     private fun tintEditTextDrawableStart() {
         ui {
             val personDrawable =

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

+package chat.rocket.android.helper
+
+import android.app.Activity
+import android.content.IntentSender
+import android.support.v4.app.FragmentActivity
+import com.google.android.gms.auth.api.credentials.*
+import com.google.android.gms.common.api.CommonStatusCodes
+import com.google.android.gms.common.api.ResolvableApiException
+import timber.log.Timber
+
+const val REQUEST_CODE_FOR_SIGN_IN_REQUIRED = 1
+const val REQUEST_CODE_FOR_MULTIPLE_ACCOUNTS_RESOLUTION = 2
+const val REQUEST_CODE_FOR_SAVE_RESOLUTION = 3
+
+/**
+ * This class handles some cases of Google Smart Lock for passwords like the request to retrieve
+ * credentials, to retrieve sign-in hints and to store the credentials.
+ *
+ * See https://developers.google.com/identity/smartlock-passwords/android/overview for futher
+ * information.
+ */
+object SmartLockHelper {
+
+    /**
+     * Requests for stored Google Smart Lock credentials.
+     * Note that in case of exception it will try to start a sign in
+     * ([REQUEST_CODE_FOR_SIGN_IN_REQUIRED]) or "multiple account"
+     * ([REQUEST_CODE_FOR_MULTIPLE_ACCOUNTS_RESOLUTION]) resolution.
+     *
+     * @param credentialsClient The credential client.
+     * @param activity The activity.
+     * @return null or the [Credential] result.
+     */
+    fun requestStoredCredentials(
+        credentialsClient: CredentialsClient,
+        activity: Activity
+    ): Credential? {
+        var credential: Credential? = null
+
+        val credentialRequest = CredentialRequest.Builder()
+            .setPasswordLoginSupported(true)
+            .build()
+
+        credentialsClient.request(credentialRequest)
+            .addOnCompleteListener {
+                when {
+                    it.isSuccessful -> {
+                        credential = it.result.credential
+                    }
+                    it.exception is ResolvableApiException -> {
+                        val resolvableApiException = (it.exception as ResolvableApiException)
+                        if (resolvableApiException.statusCode == CommonStatusCodes.SIGN_IN_REQUIRED) {
+                            provideSignInHint(credentialsClient, activity)
+                        } else {
+                            // This is most likely the case where the user has multiple saved
+                            // credentials and needs to pick one. This requires showing UI to
+                            // resolve the read request.
+                            resolveResult(
+                                resolvableApiException,
+                                REQUEST_CODE_FOR_MULTIPLE_ACCOUNTS_RESOLUTION,
+                                activity
+                            )
+                        }
+                    }
+                }
+            }
+        return credential
+    }
+
+    /**
+     * Saves a user credential to Google Smart Lock.
+     * Note that in case of exception it will try to start a save resolution,
+     * so the activity/fragment should expected for a request code
+     * ([REQUEST_CODE_FOR_SAVE_RESOLUTION]) on onActivityResult call.
+     *
+     * @param credentialsClient The credential client.
+     * @param activity The activity.
+     * @param id The user id credential.
+     * @param password The user password credential.
+     */
+    fun save(
+        credentialsClient: CredentialsClient,
+        activity: FragmentActivity,
+        id: String,
+        password: String
+    ) {
+        val credential = Credential.Builder(id)
+            .setPassword(password)
+            .build()
+
+        credentialsClient.save(credential)
+            .addOnCompleteListener {
+                val exception = it.exception
+                if (exception is ResolvableApiException) {
+                    // Try to resolve the save request. This will prompt the user if
+                    // the credential is new.
+                    try {
+                        exception.startResolutionForResult(
+                            activity,
+                            REQUEST_CODE_FOR_SAVE_RESOLUTION
+                        )
+                    } catch (e: IntentSender.SendIntentException) {
+                        Timber.e("Failed to send resolution. Exception is: $e")
+                    }
+                }
+            }
+    }
+
+    private fun provideSignInHint(credentialsClient: CredentialsClient, activity: Activity) {
+        val hintRequest = HintRequest.Builder()
+            .setHintPickerConfig(
+                CredentialPickerConfig.Builder()
+                    .setShowCancelButton(true)
+                    .build()
+            )
+            .setEmailAddressIdentifierSupported(true)
+            .build()
+
+        try {
+            val intent = credentialsClient.getHintPickerIntent(hintRequest)
+            activity.startIntentSenderForResult(
+                intent.intentSender,
+                REQUEST_CODE_FOR_SIGN_IN_REQUIRED,
+                null,
+                0,
+                0,
+                0,
+                null
+            )
+        } catch (e: IntentSender.SendIntentException) {
+            Timber.e("Could not start hint picker Intent. Exception is: $e")
+        }
+    }
+
+    private fun resolveResult(
+        exception: ResolvableApiException,
+        requestCode: Int,
+        activity: Activity
+    ) {
+        try {
+            exception.startResolutionForResult(activity, requestCode)
+        } catch (e: IntentSender.SendIntentException) {
+            Timber.e("Failed to send resolution. Exception is: $e")
+        }
+    }
+}
\ No newline at end of file

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

@@ -32,6 +32,17 @@
             app:layout_constraintRight_toRightOf="parent"
             app:layout_constraintTop_toBottomOf="@+id/text_headline" />
 
+        <ImageView
+            android:id="@+id/image_key"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:src="@drawable/ic_vpn_key_black_24dp"
+            android:tint="@color/colorDrawableTintGrey"
+            android:layout_marginEnd="10dp"
+            app:layout_constraintBottom_toBottomOf="@+id/text_username_or_email"
+            app:layout_constraintEnd_toEndOf="@+id/text_username_or_email"
+            app:layout_constraintTop_toTopOf="@+id/text_username_or_email" />
+
         <EditText
             android:id="@+id/text_password"
             style="@style/Authentication.EditText"