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activity_hello_testing_blueprint.xml

<?xml version="1.0" encoding="utf-8"?>

<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".HelloTestActivity">

<Button android:id="@+id/btn_hello_android_testing"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/btn_hello_test_text"
        android:onClick="onClick"
        android:contentDescription="@string/content_desc_hello_android_testing"/>

<TextView android:id="@+id/text_view_rocks"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:contentDescription="@string/content_desc_rocks"/>

</LinearLayout>