<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <solid android:color="#FFFFFF" />
 <corners android:radius="4dp" />
</shape>

<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
 android:color="#FF21272B">
 <item>
  <shape android:shape="rectangle">
   <solid android:color="#FFFFFF" />
   <corners android:radius="4dp" />
  </shape>
 </item>
 <item android:drawable="@drawable/rounded_corners" />
</ripple>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:gravity="center"
 android:orientation="vertical"
 android:paddingBottom="@dimen/activity_vertical_margin"
 android:paddingLeft="@dimen/activity_horizontal_margin"
 android:paddingRight="@dimen/activity_horizontal_margin"
 android:paddingTop="@dimen/activity_vertical_margin"
 tools:context=".MainActivity">

 <TextView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="@string/hello_world" />

 <Button
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  android:background="@drawable/ripple_bg"
  android:text="@string/hello_world" />
</LinearLayout>