优化

app/src/main/res/layout/item_file.xml

@@ -1,11 +1,13 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:orientation="horizontal"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:gravity="center_vertical"
-    android:padding="5dp">
+    android:orientation="horizontal"
+    android:padding="5dp"
+    android:background="?attr/selectableItemBackground"
+    tools:ignore="UseCompoundDrawables">
 
     <ImageView
         android:id="@+id/image_view"