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;

}

}MainService.java

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();

}

}

MainReciver.java

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");

}

}

}

代码很简单。有问题欢迎留言。