This is a good example of login  and Sign up page using SQLite. In this project, we have 3 activities and 2  java classes.  Contact.java   DatabaseHelper.java  Display.java  MainActivity.java  SignUp.java activity_main.xml <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:paddingBottom="@dimen/activity_vertical_margin"     android:paddingLeft="@dimen/activity_horizontal_margin"     android:paddingRight="@dimen/activity_horizontal_margin"     android:paddingTop="@dimen/activity_vertical_margin"     tools:context="com.blogspot.csdevbin.sqliteexample.MainActivity">     <EditText         android