Android中获取和释放WakeLock的方法

private PowerManager.WakeLock sCpuWakeLock;private void acquireCpuWakeLock(Context context) {    if (sCpuWakeLock != null) {        return;    }    Log.v(TAG3, "acquireCpuWakeLock");    sCpuWakeLock = createPartialWakeLock(context);    sCpuWakeLock.acquire();}private PowerManager.WakeLock createPartialWakeLock(Context context) {    Log.v(TAG3, "createPartialWakeLock");    String flag = "log";    PowerManager pm = (PowerManager) context            .getSystemService(Context.POWER_SERVICE);    return pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, flag);}   public void releaseCpuLock() {    if (sCpuWakeLock != null) {        Log.v(TAG3, "releaseCpuLock");        sCpuWakeLock.release();        sCpuWakeLock = null;    }}