所以我想让我的按钮有白边/黑底边框，在我的xml中有一个简单的解决方案吗？
是的！在res/drawable目录中创建一个新的XML文件，然后通过XML创建一个可绘制的形状。下面是一个带有2个白色边框的3个黑色圆角矩形的示例：
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
>
<corners
android:radius="3"
/>
<stroke
android:width="2"
android:color="#FFFFFFFF"
/>
<solid
android:color="#FF000000"
/>
</shape>
然后只需将此绘图设置为按钮的背景，例如：
<Button
android:background="@drawable/my_xml_file"
/>
开发者网站在创建通过XML绘制图形。
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