Add a Button Widget

Add in the relative xml file of the view the following:

<Button

    android:id="@+id/LinearLayoutLaunchButton"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:text="@string/launchLinearLayout"

    android:layout_centerVertical="true"

    android:layout_centerHorizontal="true"

    android:layout_marginTop="30dp"

    android:layout_below="@+id/textView2"

    style="@style/Widget.AppCompat.Button.Colored"/>

LinearLayoutLaunchButton: this is the name of the button
launchLinearLayout: this is a string in the string.xml file
Widget.AppCompat.Button.Colored: this is the style of the button in the styles.xml file

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