android 屏保

屏蔽系统锁屏：

        KeyguardManager manager = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);  
        KeyguardManager.KeyguardLock lock = manager  
                .newKeyguardLock("KeyguardLock");  
        lock.disableKeyguard();  

点亮屏幕：

                	if(mWakeLock == null)
                		  {      
                    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
                    mWakeLock = pm.newWakeLock(PowerManager.FULL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.ON_AFTER_RELEASE, "SimpleTimer");
                	 mWakeLock.acquire(); 
                		  }

释放屏幕：

		if(LockScreenService.mWakeLock != null)
			  {
				  LockScreenService.mWakeLock.release();
				  LockScreenService.mWakeLock = null;
			  }