Open Specific Activity When Notification Clicked in Fcm

Push notification need to open a specific activity

If notification clicks on app background state, then that will open app launcher activity. In launcher activity you need to check if there is any pending intent from notification and execute that.

Try this in your launcher activity(MainActivity).

Intent intent=new Intent();
Intent fromIntent = getIntent();
if (fromIntent.getExtras()!=null){
    try {
    Map<String,String> opendata = remoteMessage.getData();
    String actionValue = opendata.get("openactivity");

    switch (actionValue){

            case "Activity1":
                intent=new Intent(this, Activity1.class);
                break;
            case "Activity2":
                intent=new Intent(this, Activity2.class);
                break;
            default: 
                intent = new Intent(MainActivity.this, DefaultActivity.class);
                break

    }
    } catch(Exception e){
        intent = new Intent(MainActivity.this, DefaultActivity.class);
    }
} else{
        intent = new Intent(MainActivity.this, DefaultActivity.class);
}
startActivity(intent);

How to open specific activity from push notification in Android&FCM?

You will need to use Android Deep linking.

Your notification (FCM) should have a payload of some data (Message ID all depends on your design) for the given screen you want to consume in this case your chat Activity.

The chat Activity will need to have a host and schema declared in the manifest, below is the instructions and code for Deep Linking:

https://developer.android.com/training/app-links/deep-linking

Happy coding.

How to open a specific activity on push notification tapped?

private void sendNotification(String msg) {
    mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
    long notificatioId = System.currentTimeMillis();

    Intent intent = new Intent(getApplicationContext(), TestActivity.class); // Here pass your activity where you want to redirect.

    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
    PendingIntent contentIntent = PendingIntent.getActivity(this, (int) (Math.random() * 100), intent, 0);

    int currentapiVersion = android.os.Build.VERSION.SDK_INT;
    if (currentapiVersion >= android.os.Build.VERSION_CODES.LOLLIPOP){
        currentapiVersion = R.mipmap.ic_notification_lolipop;
    } else{
        currentapiVersion = R.mipmap.ic_launcher;
    }

    NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
            .setSmallIcon(currentapiVersion)
            .setContentTitle(this.getResources().getString(R.string.app_name))
            .setStyle(new NotificationCompat.BigTextStyle().bigText(msg))
            .setContentText(msg)
            .setAutoCancel(true)
            .setPriority(Notification.PRIORITY_HIGH)
            .setDefaults(Notification.FLAG_AUTO_CANCEL | Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE | Notification.DEFAULT_SOUND)
            .setContentIntent(contentIntent);
    mNotificationManager.notify((int) notificatioId, notificationBuilder.build());
}

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