android detect screen on/on

gistfile1.java

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;

public class ScreenReceiver extends BroadcastReceiver {
  public static boolean screenOff;

	@Override
	public void onReceive(Context context, Intent intent) {
		System.out.println("onReceive ");
		if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
			screenOff = true;
			System.out.println("SCREEN TURNED OFF on BroadcastReceiver");
		} else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
			screenOff = true;
			System.out.println("SCREEN TURNED ON on BroadcastReceiver");
		} else if (intent.getAction().equals(Intent.ACTION_USER_PRESENT)) {
			screenOff = false;
			System.out.println("ACTION_USER_PRESENT on BroadcastReceiver");
		}
		stateChange();
	}

	public void register(Context ctx) {
        IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT);
//        BroadcastReceiver mReceiver = new ScreenReceiver();
        ctx.registerReceiver(this, filter);
	}
	
	protected void stateChange() {
		
	}
}