Android - launch app from broadcast receiver

Question

I want the broadcast receiver to launch my app this way:

1. If the app is not in the foreground or background, launch it as if it is launched from launcher.

Answer 1

@Override
public void onReceive(Context context, Intent intent) {
    Intent launch_intent = new  Intent(context, MainActivity.class);
    launch_intent.setComponent(new ComponentName("com.example.helloworld","com.example.helloworld.MainActivity");
    launch_intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_SINGLE_TOP |INTENT.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
    launch_intent.putExtra("some_data", "value");
    launch_intent.addCategory(Intent.CATEGORY_LAUNCHER);
    context.startActivity(launch_intent);
}

It's this simple but unless you know the proper way when you try to get the extra data from your intent you will usually get a java null pointer exception.

Use the onNewIntent() method to receive the extra data. If you want to know how comment below.

Edit: Try the following. But what I don't understand is the first code which I gave you should work on its own. It has always worked for me. Have you made sure that you have copied the first code I gave you and pasted it without making any changes?

Edit2: If that doesn't work try setting the flag to clearTaskOnLaunch instead of INTENT.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED