android 屏幕保护

首先，需要启动一个后台服务，用于注册一个BroadcastReceiver

这个BroadcastReceiver用于监听Intent.ACTION_SCREEN_OFF

这样在发生这个事件Intent.ACTION_SCREEN_OFF 也就是用户锁屏或者屏幕上锁时触发。

Service中注册BroadcastReceiver代码

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package com.pingbao; 
import android.app.KeyguardManager; 
import android.app.Service; 
import android.app.KeyguardManager.KeyguardLock; 
import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.content.IntentFilter; 
import android.os.IBinder; 
import android.util.Log; 
public class ZyScreenService extends Service { 
    KeyguardManager mKeyguardManager = null; 
    private KeyguardLock mKeyguardLock = null; 
    @Override 
    public IBinder onBind(Intent arg0) { 
        // TODO Auto-generated method stub 
        return null; 
    } 
    @Override 
      public void onCreate() 
      { 
        // TODO Auto-generated method stub 
           
        super.onCreate(); 
      } 
     @Override 
      public void onStart(Intent intent, int startId) 
      { 
        // TODO Auto-generated method stub 
         Log.i("in Service","in Service"); 
            mKeyguardManager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE); 
            mKeyguardLock = mKeyguardManager.newKeyguardLock(""); 
            mKeyguardLock.disableKeyguard(); 
            Log.i("in Service1","in Service1"); 
            BroadcastReceiver mMasterResetReciever = new BroadcastReceiver() { 
                public void onReceive(Context context, Intent intent) { 
                    try { 
                        Intent i = new Intent(); 
                        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
                        i.setClass(context, ZyScreenSaver.class); 
                        context.startActivity(i); 
                        // finish(); 
                        Log.i("BroadcastReceiver","B