android 点亮屏幕与解锁

下面的代码可以用来点亮屏幕 
PowerManager pm = (PowerManager)getSystemService(POWER_SERVICE); 
mWakelock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP |PowerManager.SCREEN_DIM_WAKE_LOCK, "SimpleTimer"); 

mWakelock.acquire();. 

mWakelock.release(); 

下面的代码用来屏幕 解锁  
KeyguardManager keyguardManager = (KeyguardManager)getSystemService(KEYGUARD_SERVICE); 
KeyguardLock keyguardLock = keyguardManager.newKeyguardLock(""); 

keyguardLock.disableKeyguard(); 

使用这两段代码，需要在AndroidManifest文件中加入 
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"></uses-permission> 
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>