Keeping screen awake when plugged

Here is how to keep the screen awake for certain activity, but only when the phone is plugged.
The provided code should be place inside Activity.

 private BroadcastReceiver powerConnectReceiver = new BroadcastReceiver(){
  @Override
  public void onReceive(Context arg0, Intent intent) {
    boolean plugged = intent.getIntExtra(BatteryManager.EXTRA_PLUGGED, 0) > 0;
    findViewById(R.id.map).setKeepScreenOn(plugged);
  }
};

….  

@Override
protected void onResume() {
  registerReceiver(powerConnectReceiver, new IntentFilter(
    Intent.ACTION_BATTERY_CHANGED));
  super.onResume();
}

@Override
protected void onPause() {
  unregisterReceiver(powerConnectReceiver);
  super.onPause();
}