package com.example.lockscreenlistenerdemo;public interface LockScreenListener {    String Tag="LockScreenListener";    public void onScreenOn();    public void onScreenOff();    public void onUserPresent();}

package com.example.lockscreenlistenerdemo;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class LockScreenBroadcastReceiver extends BroadcastReceiver {    LockScreenListener lockScreenListener;        public LockScreenBroadcastReceiver(LockScreenListener lockScreenListener) {        super();        this.lockScreenListener = lockScreenListener;    }    @Override    public void onReceive(Context content, Intent intent) {        // TODO Auto-generated method stub        String action=intent.getAction();        if(action.equals(Intent.ACTION_SCREEN_ON)){            lockScreenListener.onScreenOn();        }else if(action.equals(Intent.ACTION_SCREEN_OFF)){            lockScreenListener.onScreenOff();        }else if(action.equals(Intent.ACTION_USER_PRESENT)){            lockScreenListener.onUserPresent();        }    }}

package com.example.lockscreenlistenerdemo;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.util.Log;public class MainActivity extends Activity {    LockScreenBroadcastReceiver lockScreenBroadcastReceiver;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        lockScreenBroadcastReceiver = new LockScreenBroadcastReceiver(                new LockScreenListener() {                    @Override                    public void onUserPresent() {                        // TODO Auto-generated method stub                        Log.i(Tag,"onUserPresent");                    }                    @Override                    public void onScreenOn() {                        // TODO Auto-generated method stub                        Log.i(Tag,"onScreenOn");                    }                    @Override                    public void onScreenOff() {                        // TODO Auto-generated method stub                        Log.i(Tag,"onScreenOff");                    }                });        IntentFilter intentFilter=new IntentFilter();        intentFilter.addAction(Intent.ACTION_SCREEN_OFF);        intentFilter.addAction(Intent.ACTION_SCREEN_ON);        intentFilter.addAction(Intent.ACTION_USER_PRESENT);        registerReceiver(lockScreenBroadcastReceiver, intentFilter);    }    @Override    protected void onDestroy() {        // TODO Auto-generated method stub        unregisterReceiver(lockScreenBroadcastReceiver);        super.onDestroy();    }}

01-04 08:29:23.432: I/LockScreenListener(12615): onScreenOff01-04 08:29:24.062: I/LockScreenListener(12615): onScreenOn01-04 08:29:25.612: I/LockScreenListener(12615): onUserPresent01-04 08:29:35.512: I/LockScreenListener(12615): onScreenOff