在Android中的主线程上执行代码而不访问Activity? [英] Execute code on main thread in Android without access to an Activity?

问题描述

我有一个可启动并维护后台线程的Android服务.

I have an Android service that starts and maintains a background thread.

有时，后台线程需要在主线程上进行回调.我对如何做到这一点感到困惑.

From time to time, the background thread needs to do a callback on the main thread. I'm stumped as to how to do this.

我无法调用this.runOnUiThread，因为"this"是Service的实例，不是Activity的实例，并且Service没有runOnUiThread方法.

I can't call this.runOnUiThread because "this" is an instance of Service, not Activity, and a Service doesn't have the runOnUiThread method.

我也无法创建或执行AsyncTask，因为AsyncTask的文档说构造函数和execute方法都必须从UI线程中调用.

I also can't create or execute an AsyncTask, because the documentation for AsyncTask says that both the constructor and the execute method must be invoked from the UI thread.

我是否需要维护对使用该服务的活动的引用并调用其runOnUiThread方法，或者是否有另一种方法可以在UI线程上运行某些东西?

Do I need to maintain a reference to the activity that is using the service and call its runOnUiThread method, or is there another way to run something on the UI thread?

谢谢.

推荐答案

如果我(由于某种原因或其他原因)不直接访问Activity，那么我会不时使用以下代码；

I'm using following code from time to time if I do not hold direct access to Activity (for a reason or another);

new Handler(Looper.getMainLooper()).post(mYourUiThreadRunnable);

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