文件预览：default_shape.xml

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <!-- 颜色填充方式绘画按钮 --> <!--<solid android:color="?attr/colorPrimaryDark" />--> <stroke android:width="2dp" android:color="?attr/colorPrimary" /> <corners android:radius="15dp" /> <!-- 颜色线性渐变方式绘画按钮 --> <gradient android:angle="270" android:startColor="?attr/colorAccent" android:centerColor="?attr/colorPrimary" android:endColor="?attr/colorPrimaryDark"/> <padding android:left="5dp" android:top="5dp" android:right="5dp" android:bottom="5dp" /> </shape>