remove test bg black ui

Author: ToDou

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

@@ -16,7 +16,6 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:fitsSystemWindows="true"
-        android:background="@android:color/black"
         app:layout_behavior="@string/nest_refresh_scroll_behavior">
 
         <android.support.design.widget.AppBarLayout

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

@@ -4,14 +4,13 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="@android:color/black">
+    android:background="#f4f4f5">
 
     <com.todou.nestrefresh.RefreshBarLayout
         android:id="@+id/pull_refresh_hover"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="vertical"
-        android:background="@android:color/white"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
         app:layout_constraintTop_toTopOf="parent">
@@ -167,7 +166,6 @@
 
     <android.support.v7.widget.RecyclerView
         android:id="@+id/recycler_view"
-        android:background="@android:color/white"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:layout_behavior="@string/nest_refresh_bar_scroll_behavior"/>

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

@@ -3,7 +3,6 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:fitsSystemWindows="@bool/out_fits_system_windows"
-    android:background="@android:color/black"
     android:layout_height="match_parent"
     android:layout_width="match_parent">