How to force quit the Android app and restart it? [duplicate]

Answer 1

you can exit of app with System.exit(0) : this doesn't require permission for your app

Answer 2

You can restart your app in two steps:

1. Kill your own process. Use Process.myPid(), pass it into Process.killProcess(). You might need to add a permission to your manifest (possibly android.permission.KILL_BACKGROUND_PROCESSES) to get this to work.
2. Before you kill your own process, register an Alarm with a pending intent to restart your Activity in the very near future. The second parameter to alarm.set is the triggerAtTime. Setting it to 0 causes the alarm to fire immediately. The example here sets a time to launch the app one second into the future.

The Code goes like this:

AlarmManager alm = (AlarmManager) this.getSystemService(Context.ALARM_SERVICE);
alm.set(AlarmManager.RTC, System.currentTimeMillis() + 1000, PendingIntent.getActivity(this, 0, new Intent(this, this.getClass()), 0));

Answer 3

I suppose you could call finish to make your activity stop but you will not be able to make your app start back up again. That would require (if it is even possible) root and it would be a terrible idea. It would mean that any app could start itself whenever it wanted to: which is just a bad idea and would actually be a bug if it was possible.