LoginDatabase login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <EditText
        android:id="@+id/edittext_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="username" />
    <EditText
        android:id="@+id/edittext_password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="password"/>
    <Button
        android:id="@+id/button_login"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"/>
    <Button
        android:id="@+id/button_exit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Exit"/>
</LinearLayout>