问题描述
在从小部件中的非 UI 线程调用函数后,我尝试发布祝酒词.我已经阅读了多种执行此操作的方法(发布/新处理程序/广播),但大多数方法似乎针对的是活动而不是小部件类,我无法工作.
I am trying to post a toast after calling a function from a non UI thread in a widget. I've read multiple ways of doing this (post/new handler/broadcast) but most methods seem to be aimed at activities rather than widget classes and I can't get any to work.
我在下面有一些基本代码......谁能告诉我做我需要做的最好的方法,也许可以提供一个例子......谢谢(显然我已经删除了所有不必要的部分......
I have some basic code below... Can anyone tell me the best way to do what I need to do and maybe provide an example... Thank you (obviously I've taken out all the unnecessary bits...
我知道你不能在小部件中使用 runOnUiThread,但是基本上做我想做的最好的方法是什么???
I know you can't use runOnUiThread in a widget but what is the best way of basically doing what I want???
提前致谢
public class MyWidget extends AppWidgetProvider { @Override public void onReceive(final Context context, Intent intent) { super.onReceive(context, intent); new Thread(new Runnable() { public void run() { DoStuff(); } }).start(); } public void DoStuff () { //do a load of stuff on the non UI thread which might take some time and return a string String mymessage = "amessage" runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(context, mymessage, Toast.LENGTH_SHORT).show(); } }); }
}
推荐答案
您可以创建自己的 runOnUiThread() 版本.当我需要从 Activity 外部在 UI 线程中运行某些东西时,我会使用这种方法:
You can create your own version of runOnUiThread(). This is what I use when I need to run something in the UI thread from outside an Activity:
public final class ThreadPool { private static Handler sUiThreadHandler; private ThreadPool() { } /** * Run the {@code Runnable} on the UI main thread. * * @param runnable the runnable */ public static void runOnUiThread(Runnable runnable) { if (sUiThreadHandler == null) { sUiThreadHandler = new Handler(Looper.getMainLooper()); } sUiThreadHandler.post(runnable); } // Other, unrelated methods... }
然后,您可以简单地调用 ThreadPool.runOnUiThread(runnable).
Then, you can simply call ThreadPool.runOnUiThread(runnable).
您可以在此系列文章中找到有关其工作原理的更多信息:Android:Looper、Handler、HandlerThread.第一部分
You can find more information on how this works in this post series: Android: Looper, Handler, HandlerThread. Part I