android_mobile_linkdiay/app/src/main/res/drawable/btn_blue_shape.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <!-- 填充颜色 -->
    <solid></solid>
    <!-- 线的宽度，颜色灰色 -->
    <stroke android:width="1px" ></stroke>
    <!-- 矩形的圆角半径 -->
    <corners android:radius="5dp" />
</shape>