Android 判斷Service是否已經運行

	private boolean isServiceStart() {
		ActivityManager myManager = (ActivityManager) getApplicationContext()
				.getSystemService(Context.ACTIVITY_SERVICE);
		ArrayList runningService = (ArrayList) myManager
				.getRunningServices(30);
		for (int i = 0; i < runningService.size(); i++) {
			if (runningService.get(i).service.getClassName().toString()
					.equals("com.**.**.YourService")) {
				return true;
			}
		}
		return false;
	}