Add FloatingSearchView

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

 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:theme="@style/AppTheme">
+    android:layout_height="match_parent">
 
     <android.support.v7.widget.RecyclerView
         android:id="@+id/recycler_view"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:scrollbars="vertical" />
+        android:clipToPadding="false"
+        android:gravity="center_horizontal"
+        android:paddingTop="84dp" />
+
+    <com.arlib.floatingsearchview.FloatingSearchView
+        android:id="@+id/floating_search_view"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        app:floatingSearch_close_search_on_keyboard_dismiss="true"
+        app:floatingSearch_dimBackground="false"
+        app:floatingSearch_dismissOnOutsideTouch="true"
+        app:floatingSearch_leftActionMode="showSearch"
+        app:floatingSearch_searchBarMarginLeft="4dp"
+        app:floatingSearch_searchBarMarginRight="4dp"
+        app:floatingSearch_searchBarMarginTop="28dp" />
 
-</LinearLayout>
\ No newline at end of file
+</RelativeLayout>
\ No newline at end of file