用户按“后退”或“主页”按钮时停止执行者服务

Question

我正在尝试确保在按下“后退”按钮或“主页”按钮时执行程序服务停止。

目前，我在onCreate类的main activity函数中包含此代码：

    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();

    final Wifi wifiObject = new Wifi((WifiManager) getSystemService(Context.WIFI_SERVICE));


    Runnable periodicTask = new Runnable() {

        public void run() {

            // For each AP in the database, we will fill the AP's ArrayList with their corresponding RSS values
            for (Map.Entry<String, String> entry : AccessPoints.entrySet()) {
                int APNoToBeSent = 0;

                try {
                    wifiObject.scanWifi(entry.getKey(), accessPointMeanRSSArrayList, accessPointRSSFrequencyArrayList);
                }
                catch (Exception e) {
                }

                ++APNoToBeSent;
            }

            System.out.println("Mean AP0 = " + accessPointMeanRSSArrayList.get(0));
            System.out.println("Frqcy AP0 = " + accessPointRSSFrequencyArrayList.get(0));

        }

    };

    executor.scheduleAtFixedRate(periodicTask, 0, 2, TimeUnit.SECONDS);

我一直在对此进行一些阅读，但我不确定这是应该在onStop()还是onPause()或完全不同的情况下发生？