//BE CAREFUL WITH THIS - App may get suspended from Google Play without prior notice for 
    //requesting REQUEST_IGNORE_BATTERY_OPTIMIZATIONS

    @RequiresApi(api = Build.VERSION_CODES.M)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    
        String packageName = getPackageName();
        Intent intent = new Intent();
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        if (pm.isIgnoringBatteryOptimizations(packageName)) {
            //do stuff
        } else {
            intent.setAction(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS);
            intent.setData(Uri.parse("package:"+packageName));
            
            //OR 
            //Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS to see list of white listed apps
            
            startActivity(intent);
        }
    }