Hello Android Example

activity_main.xml xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/root_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:padding="16dp"

activity_main.xml xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/root_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#c7c9bf" >