警告对话框与自定义布局失败 [英] Alert Dialog with custom layout failing

问题描述

因此​​，这涉及到一个问题，我刚才问。我想显示使用指定的布局警报。我的布局是：

So this is related to a question I asked earlier. I am trying to display an alert using a specified layout. My layout is:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/layout_root"
              android:orientation="horizontal"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:padding="10dp">
    <TextView android:id="@+id/text"
              android:layout_width="wrap_content"
              android:layout_height="fill_parent"
              android:textColor="#FFF" />   
</LinearLayout>

而code调用并显示警告对话框是：

And the code to call and show the alert dialog is:

    Context mContext = getApplicationContext();

    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    // use a custom View defined in xml
    View view = LayoutInflater.from(mContext).inflate(R.layout.sell_dialog,      (ViewGroup) findViewById(R.id.layout_root));
    builder.setView(view);
    builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {

            // do whatever you want with the input
        }
    });
    AlertDialog alertDialog = builder.create();

    alertDialog.show();

当我运行它，我得到一个错误说：

When I run it I get an error saying:

未捕获的处理程序：螺纹主力退出，由于未捕获的异常
android.view.WindowManager $ NadTokenException：无法添加窗口 - 令牌null不是一个应用程序

Uncaught handler: thread main exiting due to uncaught exception android.view.WindowManager$NadTokenException: Unable to add window -- token null is not for an application

我已经通过Android开发网站看了看，不能弄明白。我想我只是失去了一些东西明显，但修复不是在我跳出。我怎样才能显示此警告对话框？

I've looked through the android development site and can't figure it out. I think I'm just missing something obvious but the fix isn't jumping out at me. How can I get this alert dialog to display?

推荐答案

不要使用 getApplicationContext（）。该方法是只在上下文可（例如，活动） - 使用上下文您 AlertDialog.Builder 。

Do not use getApplicationContext(). That method is only available on a Context (e.g., Activity) -- use that Context for your AlertDialog.Builder.

下面是从我的书一个示例项目，在其他中的事情，显示了 AlertDialog 基于掀起了自定义的查看。

Here is a sample project from one of my books that, among other things, shows an AlertDialog based off of a custom View.

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