Show updates screen when notification is clicked

app/src/main/java/foundation/e/apps/MainActivity.kt

@@ -44,6 +44,8 @@ class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemS
         currentFragmentId = if (savedInstanceState != null &&
                 savedInstanceState.containsKey(CURRENTLY_SELECTED_FRAGMENT_KEY)) {
             savedInstanceState.getInt(CURRENTLY_SELECTED_FRAGMENT_KEY)
+        } else if (intent.hasExtra(Constants.UPDATES_NOTIFICATION_CLICK_EXTRA)) {
+            R.id.menu_updates
         } else {
             R.id.menu_home
         }
@@ -101,6 +103,7 @@ class MainActivity : AppCompatActivity(), BottomNavigationView.OnNavigationItemS
     }
 
     private fun showFragment(fragment: Fragment) {
+        bottom_navigation_view.menu.findItem(currentFragmentId).isChecked = true
         supportFragmentManager
                 .beginTransaction()
                 .replace(R.id.frame_layout, fragment)

app/src/main/java/foundation/e/apps/updates/UpdatesNotifier.kt

@@ -3,10 +3,13 @@ package foundation.e.apps.updates
 import android.app.Notification
 import android.app.NotificationChannel
 import android.app.NotificationManager
+import android.app.PendingIntent
 import android.content.Context
+import android.content.Intent
 import android.os.Build
 import android.support.v4.app.NotificationCompat
 import android.support.v4.app.NotificationManagerCompat
+import foundation.e.apps.MainActivity
 import foundation.e.apps.R
 import foundation.e.apps.utils.Constants
 
@@ -35,9 +38,19 @@ class UpdatesNotifier {
             notificationBuilder.setContentText(context.getString(R.string.updates_notification_text,
                     Constants.MANUALLY_INSTALL_UPDATES))
         }
+        notificationBuilder.setContentIntent(getClickIntent(context))
+        notificationBuilder.setAutoCancel(true)
         return notificationBuilder.build()
     }
 
+    private fun getClickIntent(context: Context): PendingIntent {
+        val intent = Intent(context, MainActivity::class.java).apply {
+            flags = Intent.FLAG_ACTIVITY_CLEAR_TASK
+            putExtra(Constants.UPDATES_NOTIFICATION_CLICK_EXTRA, true)
+        }
+        return PendingIntent.getActivity(context, 0, intent, 0)
+    }
+
     private fun createNotificationChannel(context: Context) {
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             val importance = NotificationManager.IMPORTANCE_DEFAULT

app/src/main/java/foundation/e/apps/utils/Constants.kt

@@ -35,4 +35,5 @@ object Constants {
     const val UPDATES_NOTIFICATION_CHANNEL_TITLE = "App updates"
     const val AUTOMATICALLY_INSTALL_UPDATES = "will"
     const val MANUALLY_INSTALL_UPDATES = "will not"
+    const val UPDATES_NOTIFICATION_CLICK_EXTRA = "updates_notification_click_extra"
 }