Android-Service-优快云博客

本文链接：https://blog.youkuaiyun.com/caizemingg/article/details/42488817

本文详细介绍了 Android 中 Service 的工作原理，包括其运行线程特性、startService 和 bindService 的交互方式以及如何避免 ANR 错误等内容。

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1、问题列表

1.1、service是运行在一个单独的线程？

官方原文：

Caution: A service runs in the main thread of its hosting process—the service does not create its own thread and does not run in a separate process (unless you specify otherwise). This means that, if your service is going to do any CPU intensive work or blocking operations (such as MP3 playback or networking), you should create a new thread within the service to do that work. By using a separate thread, you will reduce the risk of Application Not Responding (ANR) errors and the application's main thread can remain dedicated to user interaction with your activities.

并不是运行在一个单独的线程的，是运行在启动他的组件的主线程上的。所以如果我们需要在service中做一些耗时的操作，需要自己另外启一个线程。

1.2、service可以同时被startService（）和bindService（）启动吗？

官方原文： These two paths are not entirely separate. That is, you can bind to a service that was already started with startService() . For example, a background music service could be started by calling startService() with an Intent that identifies the music to play. Later, possibly when the user wants to exercise some control over the player or get information about the current song, an activity can bind to the service by calling bindService() . In cases like this, stopService() or stopSelf() does not actually stop the service until all clients unbind.

一个service可以同时被startService（）和bindService（）