Android Login and Register Using Restful Web Services (Java + MySQL)

Here you will learn to make android login and register system using restful web services in java and mysql.

In this tutorial I will teach you to develop a very simple android app for login and register system. This system sends the login or register request to the restful web service that is running on local server.

If you don’t know how to make restful web services in java and use it in android then I would highly recommend you to first read below tutorials.

Also Read: Create Simple Java RESTful Web Services Using Jersey

Also Read: Android Restful Web Service Client Example

Android Login and Register Using Restful Web Services (Java + MySQL)

Create Restful Web Service

I have used MySQL database in this web service. Make a login table in database with following schema.

mysql database login schema

Below is the code for restful web service developed in Java.

DemoService.java

package example;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

import javax.ws.rs.Consumes;
import javax.ws.rs.FormParam;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

@Path("/DemoService")
public class DemoService {
	final static String url = "jdbc:mysql://localhost:3306/test";
	final static String user = "root";
	final static String pass = "root";

	@POST
	@Path("/login")
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	@Produces(MediaType.TEXT_HTML)
	public String login(@FormParam("email") String email, @FormParam("password") String password){
		String result="false";
		
		try{
			Class.forName("com.mysql.jdbc.Driver");
			Connection con = DriverManager.getConnection(url, user, pass);
			
			PreparedStatement ps = con.prepareStatement("select * from login where email=? and password=?");
			ps.setString(1, email);
			ps.setString(2, password);
			
			ResultSet rs = ps.executeQuery();
			
			if(rs.next()){
				result = "true";
			}
			
			con.close();
		}
		catch(Exception e){
			e.printStackTrace();
		}
		
		return result;
	}

	@POST
	@Path("/register")
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	@Produces(MediaType.TEXT_HTML)
	public String register(@FormParam("email") String email, @FormParam("password") String password){
		String result="false";
		int x = 0;
		
		try{
			Class.forName("com.mysql.jdbc.Driver");
			Connection con = DriverManager.getConnection(url, user, pass);
						
			PreparedStatement ps = con.prepareStatement("insert into login(email, password) values(?,?)");
			ps.setString(1, email);
			ps.setString(2, password);
			
			x = ps.executeUpdate();
			
			if(x==1){
				result = "true";
			}
			
			con.close();
		}
		catch(Exception e){
			e.printStackTrace();
		}
		
		return result;
	}
}

Create Android Project

Make a new android project with package name com.loginandregister

For sending and fetching data from server I am using Volley library. So add its dependency in build.gradle file.

compile 'com.android.volley:volley:1.0.0'

Read below tutorial if you don’t know how to use volley library.

Also Read: Android Volley Tutorial With Example

As we are doing network related operation so add internet access permission in AndroidManifest.xml file.

<uses-permission android:name="android.permission.INTERNET"/>

Now create three activities in the project Login, Register and Home. Add following code in the respective files.

Login.java

package com.loginandregister;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import java.util.HashMap;
import java.util.Map;

public class Login extends AppCompatActivity {
    EditText emailBox, passwordBox;
    Button loginButton;
    TextView registerLink;
    String URL = "http://192.168.1.8/JavaRESTfullWS/DemoService/login";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        emailBox = (EditText)findViewById(R.id.emailBox);
        passwordBox = (EditText)findViewById(R.id.passwordBox);
        loginButton = (Button)findViewById(R.id.loginButton);
        registerLink = (TextView)findViewById(R.id.registerLink);

        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringRequest request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        if(s.equals("true")){
                            Toast.makeText(Login.this, "Login Successful", Toast.LENGTH_LONG).show();
                            startActivity(new Intent(Login.this,Home.class));
                        }
                        else{
                            Toast.makeText(Login.this, "Incorrect Details", Toast.LENGTH_LONG).show();
                        }
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Toast.makeText(Login.this, "Some error occurred -> "+volleyError, Toast.LENGTH_LONG).show();;
                    }
                }) {
                    @Override
                    protected Map<String, String> getParams() throws AuthFailureError {
                        Map<String, String> parameters = new HashMap<String, String>();
                        parameters.put("email", emailBox.getText().toString());
                        parameters.put("password", passwordBox.getText().toString());
                        return parameters;
                    }
                };

                RequestQueue rQueue = Volley.newRequestQueue(Login.this);
                rQueue.add(request);
            }
        });

        registerLink.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(Login.this, Register.class));
            }
        });
    }
}

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="20dp"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:paddingTop="20dp"
    tools:context="com.loginandregister.Login"
    android:orientation="vertical"
    android:gravity="center">

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

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:id="@+id/passwordBox"
        android:layout_marginTop="10dp"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login"
        android:id="@+id/loginButton"
        android:layout_marginTop="10dp"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click here to register"
        android:textSize="20dp"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:id="@+id/registerLink"
        android:textColor="#0D47A1"/>
</LinearLayout>

Register.java

package com.loginandregister;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import java.util.HashMap;
import java.util.Map;

public class Register extends AppCompatActivity {
    EditText emailBox, passwordBox;
    Button registerButton;
    TextView loginLink;
    String URL = "http://192.168.1.8/JavaRESTfullWS/DemoService/register";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_register);

        emailBox = (EditText)findViewById(R.id.emailBox);
        passwordBox = (EditText)findViewById(R.id.passwordBox);
        registerButton = (Button)findViewById(R.id.registerButton);
        loginLink = (TextView)findViewById(R.id.loginLink);

        registerButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                StringRequest request = new StringRequest(Request.Method.POST, URL, new Response.Listener<String>(){
                    @Override
                    public void onResponse(String s) {
                        if(s.equals("true")){
                            Toast.makeText(Register.this, "Registration Successful", Toast.LENGTH_LONG).show();
                        }
                        else{
                            Toast.makeText(Register.this, "Can't Register", Toast.LENGTH_LONG).show();
                        }
                    }
                },new Response.ErrorListener(){
                    @Override
                    public void onErrorResponse(VolleyError volleyError) {
                        Toast.makeText(Register.this, "Some error occurred -> "+volleyError, Toast.LENGTH_LONG).show();;
                    }
                }) {
                    @Override
                    protected Map<String, String> getParams() throws AuthFailureError {
                        Map<String, String> parameters = new HashMap<String, String>();
                        parameters.put("email", emailBox.getText().toString());
                        parameters.put("password", passwordBox.getText().toString());
                        return parameters;
                    }
                };

                RequestQueue rQueue = Volley.newRequestQueue(Register.this);
                rQueue.add(request);
            }
        });

        loginLink.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startActivity(new Intent(Register.this, Login.class));
            }
        });
    }
}

activity_register.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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.loginandregister.Register"
    android:orientation="vertical"
    android:gravity="center">

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

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="Password"
        android:id="@+id/passwordBox"
        android:layout_marginTop="10dp"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Register"
        android:id="@+id/registerButton"
        android:layout_marginTop="10dp"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Click here to login"
        android:textSize="20dp"
        android:layout_marginTop="15dp"
        android:gravity="center"
        android:id="@+id/loginLink"
        android:textColor="#0D47A1"/>
</LinearLayout>

Home.java

package com.loginandregister;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Home extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
    }
}

activity_home.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="20dp"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
    android:paddingTop="20dp"
    tools:context="com.loginandregister.Home"
    android:gravity="center">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="- Welcome -"
        android:textSize="30dp"
        android:gravity="center"/>
</LinearLayout>

Make sure the web service is already running on the server. Also change the IP 192.168.1.8 in the URL with the IPv4 of your local system. You can find the IPv4 in windows by typing ipconfig command in command prompt.

Finally run and test the project.

Screenshots

home

The whole code is very simple and self-explanatory. If still you are facing any problem then feel free to ask in comment section.

The post Android Login and Register Using Restful Web Services (Java + MySQL) appeared first on The Crazy Programmer.

Android Login and Register Using Restful Web Services (Java + MySQL)