Android 电源锁

	WakeLock wakeLock = null;

	private void acquireWakeLock()
	{
		if (null == wakeLock)
		{
			PowerManager pm = (PowerManager)this.getSystemService(Context.POWER_SERVICE);
			wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK|PowerManager.ON_AFTER_RELEASE, "PostLocationService");
			if (null != wakeLock)
			{
				wakeLock.acquire();
			}
		}
	}
	
	private void releaseWakeLock()
	{
		if (null != wakeLock)
		{
			wakeLock.release();
			wakeLock = null;
		}
	}