从服务访问 UI 线程处理程序 [英] Accessing UI thread handler from a service
问题描述
我正在 Android 上尝试一些新的东西，我需要访问 UI 线程的处理程序.
I am trying some thing new on Android for which I need to access the handler of the UI thread.
我知道以下几点:
- UI 线程有自己的处理程序和活套
- 任何消息都会被放入进入UI的消息队列线程
- looper 接手事件并将其传递给处理程序
- 处理程序处理消息并将特定事件发送到 UI
我想要我的服务，它必须获取 UI 线程处理程序并将消息放入此处理程序中.以便此消息将被处理并将被发布到 UI.这里的服务将是一个普通的服务，由某个应用程序启动.
I want to have my service which has to get the UI thread handler and put a message into this handler. So that this message will be processed and will be issued to the UI. Here the service will be a normal service which will be started by some application.
我想知道这是否可能.如果是这样，请建议一些代码片段，以便我可以尝试.
I would like to know if this is possible. If so please suggest some code snippets, so that I can try it.
问候女孩
推荐答案
这段代码构造了一个与主 (UI) 线程关联的 Handler:
This snippet of code constructs a Handler associated with the main (UI) thread:
Handler handler = new Handler(Looper.getMainLooper());
然后您可以像这样在主(UI)线程中发布要执行的内容:
You can then post stuff for execution in the main (UI) thread like so:
handler.post(runnable_to_call_from_main_thread);
如果处理程序本身是从主 (UI) 线程创建的，则为简洁起见，可以省略该参数:
If the handler itself is created from the main (UI) thread the argument can be omitted for brevity:
Handler handler = new Handler();
有关进程和线程的 Android 开发指南提供了更多信息.
The Android Dev Guide on processes and threads has more information.
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