如何更改 Android 警报对话框的背景? [英] How can I change the background of Android alert dialogs?

问题描述

我在我的应用程序中使用了 AlertDialog 类.默认情况下，这些警报对话框具有透明背景.我正在尝试使用不透明的背景，但非常不成功.这些是我的风格:

I use the AlertDialog class in my application. By default, these alert dialogs have a transparent background. I'm trying to use an opaque background instead, very unsuccessfully. These are my styles:

<style name="MyOpaqueActivity" parent="@android:style/Theme.Dialog">
    <item name="android:windowBackground">@drawable/my_background</item>
    <item name="android:alertDialogStyle">@style/MyOpaqueAlertDialog</item>
</style>

<style name="MyOpaqueAlertDialog" parent="@android:style/Theme.Dialog.Alert">
    <item name="android:background">#454545</item>
    <item name="android:windowBackground">@drawable/my_background</item>
    <item name="android:popupBackground">@drawable/my_background</item>
</style>

我成功地为整个活动应用了MyOpaqueActivity"样式(窗口背景更改为my_background")，但它不适用于这些活动中的警报对话框.alertDialogStyle"属性和我的MyOpaqueAlertDialog"样式似乎没有任何效果.

I applied the "MyOpaqueActivity" style successfully for whole activities (the window background is changed to "my_background"), but it doesn't work for alert dialogs within those activities. The "alertDialogStyle" attribute and my "MyOpaqueAlertDialog" style don't seem to have any effect.

那么如何更改这些警报对话框的背景呢?

So how can I change the background of these alert dialogs?

推荐答案

你的方法行不通.似乎 AlertDialog(和 Builder)对主题进行了硬编码，并且在任何地方都不尊重 alertDialogStyle:

Your approach won't work. It seems AlertDialog (and Builder) hardcode the theme and don't honor alertDialogStyle anywhere:

protected AlertDialog(Context context) {
    this(context, com.android.internal.R.style.Theme_Dialog_Alert);
}

public Builder(Context context) {
    this(context, com.android.internal.R.style.Theme_Dialog_Alert);
}

他们在这里得出了相同的结论.

They came to the same conclusion here.

从 AlertDialog 派生的自定义对话框类调用受保护的构造函数 AlertDialog(context, R.style.MyOpaqueAlertDialog) 将是一种解决方法.

A custom dialog class derived from AlertDialog that calls the protected constructor AlertDialog(context, R.style.MyOpaqueAlertDialog) would be a workaround.

在最新的 android 源代码中，有一个新的用于 AlertDialog.Builder 的公共构造函数，它采用主题参数.不幸的是，它还没有发布(也许在 Gingerbread 中?).

In the latest android source, there is a new public constructor for AlertDialog.Builder that takes a theme argument. Unfortunately, it hasn't been released yet (maybe in Gingerbread?).

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