LinearLayout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:id="@+id/activity_main"
    android:orientation="vertical"
    android:paddingTop="10dp"
    android:paddingLeft="5dp"
    android:paddingRight="5dp"
    tools:context="com.example.reaz.linearlayout.MainActivity">


    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Enter Email Address"
        android:gravity="center"
        />
    <EditText
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="top"
        android:hint="Enter message here"

        />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="SEND"
        android:layout_gravity="center"
        />

</LinearLayout>