自Android Studio 4.1起，Android Background Drawable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，自Android Studio 4.1起，我无法通过在 android:background 上设置颜色来更改 Button 的背景颜色，但没有任何效果.而且自定义 Drawable 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.

我的背景可绘制:

My background 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:

My Button:

<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

对于许多模板，Android Studio 4.1新建项目向导的项目都使用Android的材料组件库.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.

此方法的副作用是，布局中的任何< Button> 元素都会变成 MaterialButton 小部件，而不是常规的 Button 小部件. MaterialButton 会忽略 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，并且将和主题设置为使用 Theme.MaterialComponents ，则可以将布局中的XML元素切换为是< android.widget.Button> 而不是< Button> .这将导致Android的Material Components忽略该元素，并且您可以相对于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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