activity_main.xml

<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:background="@android:color/holo_orange_dark"
    android:orientation="vertical"
    android:padding="50dp"
    tools:context=".MainActivity">


    <TextView
        android:id="@+id/titleView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:padding="50dp"
        android:text="@string/mainActivity"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/alternativeLayoutButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:onClick="onClickAlternativeLayout"
        android:padding="20dp"
        android:text="@string/showAlternativeLayout" />

</LinearLayout>