监视屏幕锁的范例

package com.android.lock;


import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;


public class mainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final IntentFilter filter = new IntentFilter();  
        filter.addAction(Intent.ACTION_SCREEN_OFF);  
        filter.addAction(Intent.ACTION_SCREEN_ON);  
        registerReceiver(mBatInfoReceiver, filter);
        System.out.println("register");
    }
    
    private final BroadcastReceiver mBatInfoReceiver = new BroadcastReceiver() {  
      


@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
final String action = intent.getAction();
System.out.println(action);
         if(Intent.ACTION_SCREEN_ON.equals(action)){  
              System.out.println(1);
         }else if(Intent.ACTION_SCREEN_OFF.equals(action)){  
         System.out.println(2);
 
         }  
}  
    };  

}

通过广播机制，便可监听到屏幕状态。