优化首页背景图和返回按钮虚化问题

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

@@ -3,6 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@mipmap/home_back"
     tools:context=".home.HomeMenuFragment">
 
     <LinearLayout
@@ -140,7 +141,8 @@
             android:layout_marginRight="12dp"
             android:layout_marginTop="12dp"
             android:layout_height="0dp"
-            android:layout_weight="1">
+            android:layout_weight="1"
+            android:background="@android:color/transparent">
 
             <androidx.recyclerview.widget.RecyclerView
                 android:id="@+id/rvDeviceList"
@@ -152,6 +154,7 @@
                 android:clipToPadding="false"
                 android:nestedScrollingEnabled="false"
                 android:paddingBottom="16dp"
+                android:background="@android:color/transparent"
                 tools:listitem="@layout/item_device" />
         </androidx.swiperefreshlayout.widget.SwipeRefreshLayout>