从 Android Studio 4.1 开始，Android 背景可绘制对象在按钮中不起作用 [英] Android Background Drawable Not Working in Button Since Android Studio 4.1

问题描述

我发现从 Android Studio 4.1 开始，我无法通过在 android:background 上设置颜色来更改 Button 的背景颜色，只是没有效果.自定义 Drawable 也不能正常工作.

I find out that since Android Studio 4.1 I cannot change the background color of a Button by setting color on its android:background, just no effect. And custom Drawable is not working as well.

我的背景Drawable:

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <stroke
        android:width="1.5dp"
        android:color="@android:color/black" />

    <solid
        android:color="@android:color/white" />

    <corners
        android:radius="8dp" />

</shape>

我的按钮:

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Add To Cart"
    android:background="@drawable/background3"/>

结果:

推荐答案

Android Studio 4.1 新项目向导，对于它的许多模板，项目都使用 Material Components for Android 库.并且，它将默认主题设置为基于 Theme.MaterialComponents.DayNight.DarkActionBar.

The Android Studio 4.1 new-project wizard, for many of its templates, has the project use the Material Components for Android library. And, it sets up the default theme to be based on Theme.MaterialComponents.DayNight.DarkActionBar.

这样做的副作用是布局中的任何 元素都会变成 MaterialButton 小部件，而不是常规的 Button 小部件.MaterialButton 忽略 android:background.

A side effect of this is that any <Button> elements in a layout get turned into MaterialButton widgets, not regular Button widgets. MaterialButton ignores android:background.

如果您只想更改颜色，请使用 android:backgroundTint 或更改主题中的 colorPrimary 属性.

If all you want to do is to change the color, use android:backgroundTint or change the colorPrimary attribute in the theme.

如果您想要一个具有自定义背景的按钮，并且您的主题设置为使用 Theme.MaterialComponents，您可以将布局中的 XML 元素切换为是 而不是

.这应该会导致 Android 的 Material 组件忽略该元素，并且您可以根据 XML 属性正常操作此按钮.

If you want a button that has a custom background, and your theme is set up to use Theme.MaterialComponents, you could switch the XML element in the layout to be <android.widget.Button> instead of <Button>. This should cause the Material Components for Android to ignore that element, and you can manipulate this button normally with respect to XML attributes.

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