自定义AlertDialog - 有问题的android.R.id.custom [英] Custom AlertDialog - problem with android.R.id.custom

问题描述

我敢肯定，我错过了点这里，所以我希望有人能解释清楚。

I'm sure I'm missing the point here so I'm hoping someone can explain.

我想，当用户触摸的ImageView创建一个弹出窗口。我在AlertDialog了外观和文档说...

I want to create a popup when a user touches an ImageView. I had a look at AlertDialog and the docs say...

如果你想显示一个更复杂的视图，查找名为定制的FrameLayout，并添加您的看法吧：

If you want to display a more complex view, look up the FrameLayout called "custom" and add your view to it:

...用下面的code ...

...with the following code...

    FrameLayout fl = (FrameLayout) findViewById(android.R.id.custom);
    fl.addView(myView, new LayoutParams(MATCH_PARENT, WRAP_CONTENT));

因此​​，作为一个测试，我试图在我的onclick以下（）方法...

So as a test I tried the following in my onCLick() method...

    TextView tv = new TextView(this);
    tv.setText("Hello World");
    FrameLayout customFrameLayout = (FrameLayout) findViewById(android.R.id.custom);
    customFrameLayout.addView(tv, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));

以上我打电话addView（），其中最后一行抛出一个NullPointerException异常这让我觉得有一个与android.R.id.custom一个问题。

The last line of the above where I'm calling addView() throws a NullPointerException which makes me think there's a problem with android.R.id.custom.

所以现在的问题是，什么是错的上方，也有（通过使用Dialog类或延长它也许）创建一个自定义弹出一个更好的办法？

So the question is, what is wrong with the above and also is there a better way of creating a custom popup (perhaps by using the Dialog class or extending it)?

请注意：我只在这个例子作为测试使用TextView的，我想补充一些更复杂，我的实际弹出

NOTE: I'm only using TextView in this example as a test, I want to add something more complex for my actual popup.

推荐答案

一种选择是使用对话主题，以创建一个活动和风格是：

One option is to create an Activity and style it using the dialog theme:

<activity android:theme="@android:style/Theme.Dialog">

请参阅应用主题了解详情。

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