学步园

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

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

然后在我们启动的ZyScreenSaver这个屏保界面Activity里写上

package com.pingbao;<br /> import android.app.Activity;<br /> import android.app.AlertDialog;<br /> import android.app.Dialog;<br /> import android.content.DialogInterface;<br /> import android.content.Intent;<br /> import android.content.DialogInterface.OnClickListener;<br /> import android.os.Bundle;<br /> import android.util.Log;<br /> import android.view.KeyEvent;<br /> import android.view.Window;<br /> import android.view.WindowManager;<br /> import android.widget.ArrayAdapter;<br /> public class ZyScreenSaver extends Activity {<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> requestWindowFeature(Window.FEATURE_NO_TITLE);<br /> getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,<br /> WindowManager.LayoutParams.FLAG_FULLSCREEN);<br /> setContentView(R.layout.main);<br /> Log.i("MyScreenSaver", "MyScreenSaver");<br /> }<br /> public boolean onKeyDown(int keyCode, KeyEvent event) {<br /> super.onKeyDown(keyCode, event);<br /> if (keyCode == KeyEvent.KEYCODE_BACK) {<br /> Log.i("4", "4");<br /> showDialog(1);<br /> }<br /> // finish();<br /> return true;<br /> }<br /> protected Dialog onCreateDialog(int id) {<br /> switch (id) {<br /> case 1:<br /> return new AlertDialog.Builder(ZyScreenSaver.this).setIcon(<br /> R.drawable.icon).setTitle("退出屏保").setMessage(<br /> "是否退出屏保").setPositiveButton("确定",<br /> new OnClickListener() {<br /> @Override<br /> public void onClick(DialogInterface dialog, int which) {<br /> // TODO Auto-generated method stub<br /> finish();<br /> }<br /> })<br /> .setNegativeButton("取消",<br /> new OnClickListener() {<br /> @Override<br /> public void onClick(DialogInterface dialog, int which) {<br /> // TODO Auto-generated method stub<br /> removeDialog(1);</p> <p> }<br /> })<br /> .create();<br /> }<br /> return null;<br /> }<br /> }<br />

然后在我们的主界面里写上启动服务就可以了

package com.pingbao;<br /> import android.app.Activity;<br /> import android.content.Intent;<br /> import android.os.Bundle;<br /> import android.util.Log;<br /> import android.view.Window;<br /> import android.view.WindowManager;<br /> public class Zypingbao extends Activity {<br /> /** Called when the activity is first created. */<br /> @Override<br /> public void onCreate(Bundle savedInstanceState) {<br /> super.onCreate(savedInstanceState);<br /> setContentView(R.layout.main);<br /> Log.i("pingbao","pingbao");<br /> Intent mService=new Intent(Zypingbao.this,ZyScreenService.class);//启动服务<br /> mService.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);<br /> startService(mService);</p> <p> }<br /> } 

在Manifest里贴权限

<uses-permission android:name="android.permission.DISABLE_KEYGUARD" /> 

源码下载

http://download.csdn.net/source/2996510

如果实在要屏蔽home键 还有一种办法 就是

public void onAttachedToWindow() {<br /> this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);<br /> super.onAttachedToWindow();<br /> } 

这样在

public boolean onKeyDown(int keyCode, KeyEvent event)

函数里就能监听到home了

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http://blog.csdn.net/Zengyangtech/archive/2011/01/21/6157508.aspx

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