activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Email"
        android:id="@+id/email"
        android:inputType="textEmailAddress"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Mobile"
        android:id="@+id/mobile"
        android:inputType="phone"/>



    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/save"
        android:text="Save"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/retrive"
        android:text="Retrieve"/>


</LinearLayout>