优化1

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

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <!-- 透明背景：保证不会出现“有背景颜色” -->
+    <item>
+        <shape android:shape="rectangle">
+            <solid android:color="@android:color/transparent" />
+        </shape>
+    </item>
+
+    <!-- 底部边框：固定在底部，只画一条线 -->
+    <item android:gravity="bottom">
+        <shape android:shape="rectangle">
+            <size android:height="1dp" />
+            <solid android:color="#F3F3F3" />
+        </shape>
+    </item>
+
+</layer-list>