Android的：在后台运行的服务永远 [英] Android: Running service in background forever

问题描述

我不知道为什么，但我的服务（开始使用startService（意向...））保持关闭了一段时间。我希望我的服务，以检查每2分钟WiFiSLAM的位置，因此TimerTask的是在服务运行。我意识到，我的服务被关闭后，应用程序被关闭（的onDestroy）和屏幕关闭。

I don't know why, but my Service ( started with startService(Intent...) ) keeps closing after a while. I want my Service to check every 2 minutes the position with WiFiSLAM, therefore a TimerTask is running in the Service. I realized that my Service is shutting down after the App is closed (onDestroy) and the screen turned off.

我读过有关WakeLock，并试图这样的：

I've read about the WakeLock and tried this:

    final PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
    WakeLock wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG);
    wakeLock.acquire();

但它仍然无法正常工作。我不知道该怎么办。我只是想有我的WiFi定位框架的更新在后台的位置每两分钟。

But it still does not work. I don't know what to do. I just want to have my Wifi Positioning Framework to update the position in the background every two minutes.

我还设置onStartCommand（），以START_STICKY的返回值。也许它是在后台运行，但我不能看到日志中的LogCat中当它运行一段时间，这给了我预示着，indoorLocationManager仍在追赶新的岗位。

I also set the return value of onStartCommand() to START_STICKY. Maybe it is running in the background, but I can't see the Logs in the LogCat when it is running for a while, which gives me signals that the indoorLocationManager is still catching new positions.

有人有一个想法？

推荐答案

Android的自动杀死在后台运行很长时间（30分钟〜1小时）。

Android automatically kills applications running in background for long periods (between 30 minutes and 1 hour).

要prevent这是设置您的服务作为前台服务的唯一方法。

The only way to prevent this is setting your service as foreground service.

要做到这一点，您使用以下命令：

To do that, you use the following:

    startForeground(messgae, notification);

这将显示一个Permanente的通知，通知您的服务正在运行的用户。

This will show a permanente notification informing the user that your service is running.

其他的选项，是使用 AlarmManager 来启动 IntentService 每2分钟。

Other option, is to use AlarmManager to start an IntentService every 2 minutes.

问候。

这篇关于Android的：在后台运行的服务永远的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！