activity_main.xml

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <TextView android:id="@+id/txtHelloWorld"
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <EditText android:id="@+id/edtNomeCampo"
        android:layout_width="match_parent"
        android:inputType="text"
        android:layout_below="@id/txtHelloWorld"
        android:layout_height="wrap_content"
        />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="98dp"
        android:id="@+id/btnCliqueAqui"
        android:text="Clique aqui" />

</RelativeLayout>