MainActivity doesn't get extra from Firebase Notification intent

Question

I have tried these 3 days working on android notification where user tap on notification then Activity open. But each time i set toast, it says null. Tried with some solutions from SOF, but doesn't work. can you please look what is wrong with the code? Thanks in advance.

The Notification code is

private void sendPushNotification(JSONObject json) {
    //optionally we can display the json into log
    int notificationId = new Random().nextInt();

    Log.e(TAG, "Notification JSON " + json.toString());
    try {
        //getting the json data
        JSONObject data = json.getJSONObject("data");

        //parsing json data
        String title = data.getString("title");
        String message = data.getString("message");
        String imageUrl = data.getString("image");

        // Instantiate a Builder object.
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this.getApplicationContext(),"Default");

        Intent notifyIntent = new Intent(this, MainActivity.class);
        notifyIntent.putExtra("fromNotification", true);
        // Sets the Activity to start in a new, empty task
        notifyIntent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
        // Creates the PendingIntent
        PendingIntent pendingIntent =
                PendingIntent.getActivity(
                        this.getApplicationContext(), notificationId,
                        notifyIntent,
                        PendingIntent.FLAG_ONE_SHOT
                );

        //int id = 1;
        // Puts the PendingIntent into the notification builder
        builder.setContentIntent(pendingIntent);
        // Notifications are issued by sending them to the
        // NotificationManager system service.
        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        // Builds an anonymous Notification object from the builder, and
        // passes it to the NotificationManager
        if (mNotificationManager != null) {
            mNotificationManager.notify(notificationId, builder.build());
        }


    } catch (JSONException e) {
        Log.e(TAG, "Json Exception: " + e.getMessage());
    } catch (Exception e) {
        Log.e(TAG, "Exception: " + e.getMessage());
    }
}

And mainActivity.class is

public class MainActivity extends AppCompatActivity {



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
        actionBar.setElevation(0);
    }

    // Open Tab
    if(getIntent().getExtras() != null){

        Bundle b = getIntent().getExtras();
        boolean cameFromNotification = b.getBoolean("fromNotification");

        Toast.makeText(this.getApplicationContext(),
                "Error: " + getIntent().getExtras(),
                Toast.LENGTH_LONG).show();

        viewPager = findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = findViewById(R.id.tabs);
        viewPager.setCurrentItem(1);
        tabLayout.setupWithViewPager(viewPager);
        setupTabIcons();

    }
    else {
        viewPager = findViewById(R.id.viewpager);
        setupViewPager(viewPager);

        tabLayout = findViewById(R.id.tabs);
        viewPager.setCurrentItem(0);
        tabLayout.setupWithViewPager(viewPager);
        setupTabIcons();

    }



}



@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    setIntent(intent);
} }

Answer 1

If you have put extras to an intent and they are not received at the receiving activity, there could be 2 reasons..

1. The activity already exists in android backstack and the extras are not caught in onCreate() but they can be found in onNewIntent()

2. If the extras are passed with an activity of a PendingIntent, then as per the official documentation. http://developer.android.com/reference/android/app/PendingIntent.html. So, to pass the extras correctly, either you need to make sure each of the intents are having differentiation in terms of action, data, type, class, and categories. Or cancel the current PendingIntent if exists in the system by using FLAG_CANCEL_CURRENT or FLAG_UPDATE_CURRENT.