安卓：AsyncTask的ProgressDialog不会的ActivityGroup开 [英] Android: AsyncTask ProgressDialog will not open in ActivityGroup

问题描述

我想有AA进度对话框打开的时候轮询我的服务器。这个类是的ActivityGroup，因为它是嵌套在标签栏之内。为了保持在框架内的视图，所述的ActivityGroup是必要的。这里是我的ActivityGroup类的声明：

I am trying to have a a progress dialog open when polling my server. The class is an ActivityGroup because it is nested within a tab bar. To keep the view within the frame, the ActivityGroup is needed. Here is the declaration of my ActivityGroup class:

   public class CheckInActivity extends ActivityGroup{
        ...
        public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.checkin);
            new LocationControl().execute(this);

现在我的AsyncTask类是相同的CheckInActivityClass这样中：

Now my AsyncTask class is within the same CheckInActivityClass as such:

private class LocationControl extends AsyncTask<Context, Void, Void>
    {
        private final ProgressDialog dialog = new ProgressDialog(CheckInActivity.this);

        protected void onPreExecute()
        {
            this.dialog.setMessage("Determining your location...");
            this.dialog.show();
        }

当我运行给定的应用程序，它得来与窗口管理$ BadTokenException错误。陈述它不能启动与未知令牌的窗口。我试图做一个示例应用程序，这只是一个普通的活动（没有的ActivityGroup）和它的工作就好了。

When I run the given app it throughs an error relating to WindowManager$BadTokenException. Stating the it cannot start the window with an unknown token. I tried making a sample app that is just a regular Activity(not ActivityGroup) and it worked just fine.

有谁知道如何修改此，使其工作，还是周围的工作，将允许嵌套的进度条到标签栏之内？任何帮助是极大的AP preciated。

Does anyone know how to modify this to make it work, or a work around that will allow the progress bar to be nested within the tab bar? Any help is greatly appreciated.

推荐答案

如果在的ActivityGroup是你嵌套活动两个以上的水平TabActivity内。 Android不此刻的支持，但是有解决方法。你必须父活动传递给对话框。

If the ActivityGroup is within a TabActivity you have nested activities with more then two levels. Android doesn't support this at the moment but there is a workaround. You have to pass the parent activity to the dialog.

为此，在活动课中创建一个helper方法：

Create a helper method for this purpose in the activity class:

private Context getDialogContext() {
    Context context;
    if (getParent() != null) context = getParent();
    else context = this;
    return context;
}

然后换行

private final ProgressDialog dialog = new ProgressDialog(CheckInActivity.this);

到

private final ProgressDialog dialog = new ProgressDialog(getDialogContext());

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