从AsyncTask的更新进度对话框中活动 [英] Updating progress dialog in Activity from AsyncTask

问题描述

在我的应用程序，我做的的AsyncTask 有些紧张工作所建议的Andr​​oid的教程，并呈现出 ProgressDialog 的我的主要我的活动：

In my app I am doing some intense work in AsyncTask as suggested by Android tutorials and showing a ProgressDialog in my main my activity:

dialog = ProgressDialog.show(MyActivity.this, "title", "text");
new MyTask().execute(request);

在这里再后来在 MyTask的我发布结果反馈给活动：

where then later in MyTask I post results back to activity:

class MyTask extends AsyncTask<Request, Void, Result> {

    @Override protected Result doInBackground(Request... params) {
        // do some intense work here and return result
    }

    @Override protected void onPostExecute(Result res) {
        postResult(res);
    }
}

和结果发布，在主要活动我隐藏对话框：

and on result posting, in main activity I hide the dialog:

protected void postResult( Result res ) {
    dialog.dismiss();
    // do something more here with result...
}

所以，一切工作正常这里，但我想以某种方式更新进度对话框能够向用户展示一些真正的进展，而不是仅仅是假的请等待......的消息。我能以某种方式访问​​从 MyTask.doInBackground 进程对话框，在这里所有的工作都做了什么？

So everything is working fine here, but I would like to somehow to update the progress dialog to able to show the user some real progress instead just of dummy "Please wait..." message. Can I somehow access the progress dialog from MyTask.doInBackground, where all work is done?

据我了解正在运行作为单独的线程，这样我就可以从那里没有对话的主要活动，这就是为什么我用 onPostExecute 的结果推回它。但问题是， onPostExecute 被称为只有当所有的工作已经完成，我想在做一些中间的更新进度对话框。

As I understand it is running as separate Thread, so I cannot "talk" to main activity from there and that is why I use onPostExecute to push the result back to it. But the problem is that onPostExecute is called only when all work is already done and I would like to update progress the dialog in the middle of doing something.

任何提示如何做到这一点？

Any tips how to do this?

推荐答案

AsyncTask的有法 onProgressUpdate（整数...），您可以调用每个迭代，例如或每时间进度是在完成doInBackground（）致电 publishProgress（）。

AsyncTask has method onProgressUpdate(Integer...) that you can call each iteration for example or each time a progress is done during doInBackground() by calling publishProgress().

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