从FileObserver吐司 [英] Toast from FileObserver

问题描述

我有一个问题。我使用的是 FileObserver ，它从观看目录到另一个，前者指定目录移到新文件。在我的想法有应显示，说文件的xy已被移动，只要观察者观看目录，也如果应用仅在背景举杯消息。但我没有得到它的工作。
它总是告诉我，有一个的RuntimeException ，而且它不能被不调用完成活套。prepare（）。

I have a problem. I'm using a FileObserver, which moves new files from the watched directories to another, former specified directory. In my thoughts there should be shown a toast message that says 'File xy has been moved', as long as the observer watches the directory, also if the applications is only in the background. But I didn't get it working. It always tells me, that there is a RuntimeException, and that it cannot been done without calling Looper.prepare().

13 05-11：21：28.484：
  WARN / System.err的（3397）：
  了java.lang.RuntimeException：不能
  创建里面有螺纹的处理程序
  不叫活套。prepare（）

05-11 13:21:28.484: WARN/System.err(3397): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

我试着用用也处理的方式，但我还没有得到它的工作。

I tried the way with using an handler too, but I also didn't get it to work.

有别人的想法？
先谢谢了。

Has someone else an idea? Thanks in advance.

最好的问候，托比

推荐答案

显然，你FileObserver运行（或）其他线程。您无法修改非UI线程的用户界面。通过一个处理程序到你的FileObserver并从它发送消息。阅读关于处理程序。

Obviously, your FileObserver runs(or is) another thread. You can not modify the UI from non-UI thread. Pass a Handler to your FileObserver and send messages from it. Read about Handlers.

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