Force Application to Restart on First Activity

Force application to restart on first activity

Here is an example to restart your app in a generic way by using the PackageManager:

Intent i = getBaseContext().getPackageManager()
             .getLaunchIntentForPackage( getBaseContext().getPackageName() );
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(i);

Restarting Android app programmatically

If you just consider to switch to your starting Activity, refer to Ricardo's answer. But this approach won't reset static context of your app and won't rebuild the Application class, so the app won't be really restarted.

If you want to completely restart your app, I can advise more radical way, using PendingIntent.

private void restartApp() {
    Intent intent = new Intent(getApplicationContext(), YourStarterActivity.class);
    int mPendingIntentId = MAGICAL_NUMBER;
    PendingIntent mPendingIntent = PendingIntent.getActivity(getApplicationContext(), mPendingIntentId, intent, PendingIntent.FLAG_CANCEL_CURRENT);
    AlarmManager mgr = (AlarmManager) getApplicationContext().getSystemService(Context.ALARM_SERVICE);
    mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 100, mPendingIntent);
    System.exit(0);
}

P.S. Tried your code in my project - works well with and without finish(). So maybe you have something specific about your Activity or Fragment, you haven't written.

Android: How to auto-restart an application after it has been force closed ?

To accomplish this you have to do two things:

1. Avoid the "Force close" - standard way of application crash.
2. Setup a restart mechanism when the crash happens anyway.

See below how to do these:

1. Call Thread.setDefaultUncaughtExceptionHandler() in order to catch all uncaught exception, in which case uncaughtException() method will be called. "Force close" will not appear and the application will be unresponsive, which is not a quite good thing.
   In order to restart your application when it crashed you should do the following :

2. In the onCreate method, in your main activity initialize a PendingIntent member:

   Intent intent = PendingIntent.getActivity(
       YourApplication.getInstance().getBaseContext(),
       0,
       new Intent(getIntent()),
       getIntent().getFlags());
   

Then put the following in your uncaughtException() method:

AlarmManager mgr = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
mgr.set(AlarmManager.RTC, System.currentTimeMillis() + 2000, intent);
System.exit(2);

You also must call System.exit(), otherwise will not work.
In this way your application will restart after 2 seconds.

Eventually you can set some flag in your intent that the application crashed and in your onCreate() method you can show a dialog "I'm sorry, the application crashed, hope never again :)".

Restart app programmatically?

Try below code

Intent i = getBaseContext().getPackageManager().
           getLaunchIntentForPackage(getBaseContext().getPackageName());
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(i);

And another thing before calling your second Activity call

finish();

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