当应用程序被杀害的Andr​​oid后台服务重新启动 [英] Android Background Service is restarting when application is killed

问题描述

我开发中后台服务创建，收集传感器数据的应用程序。我从我的活动启动服务：

  startService（新意图（这一点，MyService.class））;
 

我创建的服务，所以如果应用程序被破坏，后台服务仍然继续收集数据。我想这一点，和它的工作在一定程度上。我的问题是，当我杀了应用程序，该服务似乎重新启动，因为的onCreate（）服务和 ONSTART（）方法被调用。是否有与该服务没有重新启动吗？

任何方式

更新：

所建议在下面一个答案，我在服务但没有运气增加了以下方法

  @覆盖
公众诠释onStartCommand（意向意图，诠释标志，诠释startId）{
    返回START_NOT_STICKY;
}
 

解决方案

这取决于onStartCommand返回的值。

您必须返回START_NOT_STICKY

按照 DOC ：

  

有关开始服务，有两种操作额外主要模式，他们可以决定运行中，这取决于他们从onStartCommand（）返回的值：START_STICKY用于显式开始，并根据需要停止的服务，而START_NOT_STICKY或START_REDELIVER_INTENT用于在处理发送给他们的任何命令，只应保持运​​行的服务

在短期： 如果返回START_STICKY服务被重新只要资源可用。如果返回START_NOT_STICKY你不得不重新启动该服务发送一个新的意图。

由于这一切引发了我的好奇心，我做了一个示例应用程序进行测试。你可以找到所有的这里来源的zip 有一个startService按钮和一个stopService按钮，你会期望从他们什么。 该服务将返回START_NOT_STICKY在onStartCommand。 我放在的onCreate，onStartCommand和的onDestroy祝酒词。

下面会发生什么：

• 如果我preSS开始的onCreate和ONSTART被称为
• 如果我preSS停止，的onDestroy被触发
• 如果我preSS启动两次，的onCreate被调用一次，onStartCommand两次

所以它表现为人们所期望的。

如果我启动该服务，并杀死的应用程序，你描述的，的onDestroy不会被调用，但没有的onCreate或ONSTART。

如果我回到了应用程序，我preSS重新开始，的onCreate被称为这意味着，正如我以前写的，START_NOT_STICKY prevents服务，以获得自动重新启动。

我想你有一个重新开始的服务（可能是悬而未决的意图）别的东西在你的应用程序。

I am developing an application in which a background service is created to collect sensor data. I am starting the service from my activity:

startService(new Intent(this, MyService.class));

I created the service so if the application is destroyed, the background service still continues to collect data. I tried this, and it worked to a certain extent. My problem is that when I kill the application, the service seems to restart because the onCreate() service and the onStart() methods are invoked. Is there any way with which the service isn't restarted please?

UPDATE:

As suggested in an answer below, I added the following method in the service but no luck.

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    return START_NOT_STICKY;
}

解决方案

It depends on the value returned in onStartCommand.

You must return START_NOT_STICKY

According to the doc:

For started services, there are two additional major modes of operation they can decide to run in, depending on the value they return from onStartCommand(): START_STICKY is used for services that are explicitly started and stopped as needed, while START_NOT_STICKY or START_REDELIVER_INTENT are used for services that should only remain running while processing any commands sent to them

In short: If you return START_STICKY the service gets recreated whenever the resources are available. If you return START_NOT_STICKY you have to re-activate the service sending a new intent.

Since all of this triggered my curiosity, I made a sample app to test this. You can find the zip with all the sources here There are a startService button and a stopService button that do what you would expect from them. The service returns START_NOT_STICKY in onStartCommand. I placed toasts in onCreate, onStartCommand and onDestroy.

Here what happens:

• If I press start, onCreate and onStart are called
• If I press stop, onDestroy is triggered
• If I press start twice, onCreate is called once and onStartCommand twice

So it behaves as one would expect.

If I start the service and kill the app as you described, onDestroy does not get called but neither onCreate or onStart.

If I get back to the app and I press start again, onCreate gets called which means that, as I wrote before, START_NOT_STICKY prevents the service to getting restarted automatically.

I guess you have something else in your app that starts the service again (maybe a pending intent).

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