ChangeTextViewOnButtonClick/activity_main.xml at master · JohnsAndroidStudioTutorials/ChangeTextViewOnButtonClick · GitHub

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<RelativeLayout 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"
    tools:context=".MainActivity">

    <Button
		android:id="@+id/change_text_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
		android:layout_centerHorizontal="true"
		android:layout_marginTop="197dp"
		android:text="@string/change_text" />

	<TextView
		android:id="@+id/text_to_change"
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:layout_alignParentTop="true"
		android:layout_centerHorizontal="true"
		android:layout_marginTop="58dp"
		android:text="@string/text_to_change"
		android:textAppearance="?android:attr/textAppearanceLarge"
		android:gravity="center" />

</RelativeLayout>