[Feature] Move app name to strings.xml.

Author: zhanghai

sample/src/main/AndroidManifest.xml

@@ -25,7 +25,7 @@
         android:allowBackup="true"
         android:fullBackupContent="true"
         android:icon="@mipmap/launcher_icon"
-        android:label="AndroidFastScroll Sample"
+        android:label="@string/app_name"
         android:roundIcon="@mipmap/launcher_icon"
         android:supportsRtl="true"
         android:theme="@style/Theme.Sample"

sample/src/main/res/values/strings.xml

@@ -18,6 +18,8 @@
 
 <resources>
 
+    <string name="app_name">AndroidFastScroll Sample</string>
+
     <string name="view_on_github">View on GitHub</string>
 
     <string name="navigation_recycler_view_list">RecyclerView</string>