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app/src/main/res/drawable/corners.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android" >
+
+    <solid android:color="@color/transparent" />
+
+    <corners
+        android:bottomLeftRadius="8dp"
+        android:bottomRightRadius="8dp"
+        android:topLeftRadius="8dp"
+        android:topRightRadius="8dp" />
+    <!-- 这是半透明，还可以设置全透明，那就是白色边框的效果了 -->
+
+    <stroke
+        android:dashGap="0dp"
+        android:width="1dp"
+        android:color="#FFFFFF" />
+
+</shape>