<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    
	<EditText android:id="@+id/qr_message"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:text="@string/hello" />
		
	<Button android:id="@+id/convert"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:text="@string/convert_button" />
</LinearLayout>

View with textbox and button.

button, layout, android

Java