MainActivity.java

package com.example.androidtest;

import android.os.Bundle;
import android.os.PowerManager;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		startService(new Intent(this, MainService.class));
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}
 

package com.example.androidtest;

import android.app.Service;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.IBinder;
import android.util.Log;

public class MainService extends Service {

	private String tag="test";
	
	
	
	
	@Override
	public void onCreate() {
		// TODO Auto-generated method stub
		super.onCreate();
		Log.i(tag, "onCreate");
		MainReciver r= new MainReciver();
		IntentFilter filter= new IntentFilter();
		filter.addAction(Intent.ACTION_SCREEN_OFF);
		filter.addAction(Intent.ACTION_SCREEN_ON);
		registerReceiver(r,filter);
	}

	@Override
	public IBinder onBind(Intent intent) {
		// TODO Auto-generated method stub
		Log.i(tag, "onBind");
		return null;
	}

	@Override
	public void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
	}

	@Override
	public void onLowMemory() {
		// TODO Auto-generated method stub
		super.onLowMemory();
	}

}
 

package com.example.androidtest;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.PowerManager;
import android.util.Log;

public class MainReciver extends BroadcastReceiver {

	String tag = "test";
	@Override
	public void onReceive(Context context, Intent intent) {
		// TODO Auto-generated method stub
		Log.i(tag, intent.getAction());
		PowerManager pm =(PowerManager)context.getSystemService(Context.POWER_SERVICE);
		if(pm.isScreenOn()){
			Log.e(tag, "ScreenOn");
		}else{
			Log.e(tag, "ScreenOff");
		}
	}

}