PowerManager.WakeLock请求锁时强制打开Screen和keyboardlight导致按Power键,系统也不会进Sleep问题！

写一个Activity启动该服务即可，用一个线程开启服务，要是黑屏的状态下启动才有效果。主要代码如下：

     /获取系统服务

    KeyguardManager mKeyguardManager  = (KeyguardManager) getSystemService(Context.KEYGUARD_SERVICE);    

    //初始化键盘锁，可以锁定或解开键盘锁

    KeyguardLock  mKeyguardLock = mKeyguardManager.newKeyguardLock("");

  

    mKeyguardLock.disableKeyguard();     

    //获取电源的服务
    PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);

    //点亮亮屏

     WakeLock wakeLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP | PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");

    

ACQUIRE_CAUSES_WAKEUP:一旦有请求锁时强制打开Screen和keyboardlight ON_AFTER_RELEASE:在释放锁时resetactivity timer 如果申请了partialwakelock,那么即使按Power键,系统也不会进Sleep,如Music播放时 如果申请了其它的wakelocks,按Power键,系统还是会进Sleep。此时要怎么解决呢？个人建议可以在启动Service时，注册一个广播，广播的onReceive方法中通过ComponentName类跳转到一个Activity，让这个Activity在锁屏界面上方提醒（点亮屏幕）！

onReceive方法主要代码：//FILE_PACKAGE变量为跳转Activity的包名，FILE_PACKAGE_CLASS变量为跳转Activity的类名

Intent intent = new Intent();
          ComponentName cn = new ComponentName(FILE_PACKAGE,FILE_PACKAGE_CLASS );
          intent.setComponent(cn);
          startActivity(intent);

           Activity中的主要代码：

          Window win = getWindow();

          WindowManager.LayoutParams winParams = win.getAttributes();
          winParams.flags |= (WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
            | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
            | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);            

 private void acquireWakeLock() {
         if (mWakelock == null) {
             Log.i(TAG, "Activity begin start ");
             PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
             mWakelock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, this.getClass().getCanonicalName());
             mWakelock.acquire();
         }
       
    }

    private void releaseWakeLock() {
        if (mWakelock != null && mWakelock.isHeld()) {
            mWakelock.release();
            mWakelock = null;
        }

    }

 
 @Override
 protected void onResume() {
  super.onResume();
  acquireWakeLock();
 }

 @Override
 protected void onDestroy() {
    super.onDestroy();
 }

 @Override
 protected void onPause() {
   super.onPause();

   ......
   releaseWakeLock();
 }
 
 @Override
 protected void onStop() {
  super.onStop();
 }