转载请标明出处http://blog.csdn.net/mingyue_1128

一、首先要创建一个Service保证Service一直开启。同一时候不被一键清理掉。

二、屏蔽掉系统的锁屏

三、创建锁屏的Activity，在Activity中屏蔽掉back,menu,home键

四、保证自己的进程不在近期任务中出现

一、创建一个Service名字为LockService

public class LockService extends Service{

	private KeyguardManager km;
	private KeyguardLock kk;
	private BroadcastReceiver broadcastReceiver=new BroadcastReceiver() {
		
		@Override
		public void onReceive(Context context, Intent arg1) {
			Log.e("-----能够跳到锁屏界面--------", "---------");
			Intent intent=new Intent(context,LockActivity.class);
			intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
			startActivity(intent);
		}
	};
	@Override
	public IBinder onBind(Intent arg0) {
		
		return null;
	}


	@Override
	public void onStart(Intent intent, int startId) {
		super.onStart(intent, startId);
		
		//服务里面收到关闭屏幕的动作就发送广播
		IntentFilter iFilter=new IntentFilter(Intent.ACTION_SCREEN_OFF);

		this.registerReceiver(broadcastReceiver, iFilter);

	}

	@Override
	public void onCreate() {
		super.onCreate();
		//屏蔽掉系统的锁屏
		km=(KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);
		kk=km.newKeyguardLock("");
		kk.disableKeyguard();

	}
	
	@Override
	public void onDestroy() {

		super.onDestroy();
	}
	
}

三、锁屏界面中屏蔽掉menu,home,back

public class LockActivity extends Activity{
	private  static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;
	private Button btn_open;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		this.getWindow().setFlags(FLAG_HOMEKEY_DISPATCHED, FLAG_HOMEKEY_DISPATCHED);//关键代码 
		setContentView(R.layout.activity_main);
		//解锁的button
		btn_open=(Button) findViewById(R.id.open);
		
		btn_open.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				finish();
			}
		});
	}
	@SuppressWarnings("static-access")
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {

		if(keyCode==event.KEYCODE_BACK){
			return true;
		}
		if(keyCode==event. KEYCODE_HOME){
			return true;
		}
		if(keyCode == KeyEvent.KEYCODE_MENU) {//MENU键
	        //监控/拦截菜单键
	         return true;
	    }     
		return super.onKeyDown(keyCode, event);
	}
}

       <activity 
           android:name="com.mm.wallpaper.LockActivity"
           android:launchMode="singleInstance"
           android:excludeFromRecents="true">
		<intent-filter>

                <category android:name="android.intent.category.LAUNCHER" />
                <category android:name="android.intent.category.DEFAULT" />

            </intent-filter>
       </activity>

public class MainActivity extends Activity {
	MyBroadcast receiveBroadCast;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		//注冊广播
		receiveBroadCast = new MyBroadcast();
		IntentFilter filter = new IntentFilter();
		filter.addAction("action"); // 仅仅有持有同样的action的接受者才干接收此广播
		registerReceiver(receiveBroadCast, filter);
		
		//发送广播
		Intent intent=new Intent();
		intent.setAction("action");
		this.sendBroadcast(intent);
		
	}
	public class MyBroadcast extends BroadcastReceiver{

		@Override
		public void onReceive(Context context, Intent intent) {

			KeyguardManager km = (KeyguardManager)context.getSystemService(Context.KEYGUARD_SERVICE);

			KeyguardLock kk = km.newKeyguardLock("");
			kk.disableKeyguard();
			
			//開始服务
			Intent service=new Intent();
			service.setClass(context,LockService.class);//稍后再定义
			context.startService(service);
		}
		
	}
	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		super.onDestroy();
		unregisterReceiver(receiveBroadCast);
	}
	
}

在配置清单中MainActivity须要多一个属性来保证程序始终在

   <category android:name="android.intent.category.HOME"/>