android onresume restart activity

android onresume restart activity: This code I get from stackoverflow.

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    Log.v("Example", "onCreate");
    getIntent().setAction("Already created");
}

@Override
protected void onResume() {
    Log.v("Example", "onResume");

    String action = getIntent().getAction();
    // Prevent endless loop by adding a unique action, don't restart if action is present
    if(action == null || !action.equals("Already created")) {
        Log.v("Example", "Force restart");
        Intent intent = new Intent(this, Example.class);
        startActivity(intent);
        finish();
    }
    // Remove the unique action so the next time onResume is called it will restart
    else
        getIntent().setAction(null);

    super.onResume();
}