» » (Tutorial Android) Login and Registration with PHP & MySQL

(Tutorial Android) Login and Registration with PHP & MySQL


Login dan Registrasi sangat sering kita temukan di beberapa aplikasi yang berbasis client server. Pada postingan kali ini saya akan memberikan tutorial membuat login dan registrasi di Android dengan PHP & MySQL.

Untuk mengkoneksikan antara aplikasi android dengan server, kita perlu membuat API (Application Programming Interface) sebagai jembatan penghubungnya.

Setelah itu mendesain database sekaligus menginteraksikannya dengan API.

Sebelum kita memulai, pastikan laptop/notebook sudah terinstall XAMPP.

1. Install XAMPP

Download dan install XAMPP di sini https://www.apachefriends.org/index.html

2. Buat Database MySQL

Buka http://localhost/phpmyadmin kemudian buat database baru dengan nama simple_db. Setelah itu buat table dengan nama users yang berisi field-field berikut.


3. Buat API

Langkah selanjutnya adalah membuat API. Dalam hal ini kita membuat API menggunakan PHP 5.

Buka folder xampp → htdocs dan buat folder dengan nama simple_api.

Di dalam folder simple_api, buat php file dengan nama connect.php.

Connect.php
<?php
     define('_HOST_NAME','localhost');
     define('_DATABASE_NAME','simple_db');
     define('_DATABASE_USER_NAME','root');
     define('_DATABASE_PASSWORD','');
 
     $MySQLiconn = new MySQLi(_HOST_NAME,_DATABASE_USER_NAME,_DATABASE_PASSWORD,_DATABASE_NAME);
  
     if($MySQLiconn->connect_errno) {
       die("ERROR : -> ".$MySQLiconn->connect_error);
     }


?>
Kemudian buat file register.php dan include-kan connect.php berikut. 
<?php

include_once 'connect.php';

$response = array("error" => FALSE);

if (isset($_POST['firstname']) && isset($_POST['lastname']) && isset($_POST['email']) && isset($_POST['password'])) {
 $firstname = htmlspecialchars($_POST['firstname']);
 $lastname = htmlspecialchars($_POST['lastname']);
 $email = htmlspecialchar($_POST['email']);
 $password = htmlspecialchars($_POST['password']);
 
 $encrypted_password = hash("sha256", $password);// encrypted password
    
    $sql = $MySQLiconn->query("SELECT email from users WHERE email = '$email'");

    if(mysqli_num_rows($sql) > 0) {
  $response["error"] = TRUE;
        $response["message"] = "User already existed";

        echo json_encode($response);
    }else{
     $sql = $MySQLiconn->query("INSERT INTO users(firstname, lastname, email, password, created_at) VALUES('$firstname', '$lastname', '$email', '$encrypted_password', NOW())"); 

     if($sql) {
         $response["error"] = FALSE;
         $response["message"] = "Register Successfull";

   echo json_encode($response);
     } else {
      $response["error"] = TRUE;
         $response["message"] = "Register Failure";

   echo json_encode($response);
     }  
 
    }
    
}
?>
Kemudian buat file login.php berikut : 
<?php

include_once 'connect.php';

$response = array("error" => FALSE);

if (isset($_POST['email']) && isset($_POST['password'])) {
 
 $email = htmlspecialchars($_POST['email']);
 $password = htmlspecialchars($_POST['password']);

 $encrypted_password = hash("sha256", $password);// encrypted password
        
 $sql = $MySQLiconn->query("SELECT * FROM users WHERE email='$email' AND password='$encrypted_password'");

 if(mysqli_num_rows($sql) > 0){
  while($row = $sql->fetch_array()){
   $response["error"] = FALSE;
       $response["message"] = "Login Successfull";
       $response["data"]["firstname"] = $row['firstname'];
       $response["data"]["lastname"] = $row['lastname'];
       $response["data"]["email"] = $row['email'];
      }

  echo json_encode($response);
   }else{
    $response["error"] = TRUE;
     $response["message"] = "Incorrect Email or Password!";

  echo json_encode($response);
   }
}

?>
4. Buat Android Project

Setelah kita membuat API, berikutnya adalah membuat project baru di Android. Aplikasi yang dibuat nantinya memiliki 3 tampilan yakni Login, Registration dan Dashboard.

Pertama, tambahkan library yang diperlukan di gradle.

Untuk library networking kita menggunakan Retrofit 2. Penjelasan dan implementasi Retrofit 2 dalam dilihat di postingan saya sebelumnya http://wimsonevel.blogspot.co.id/2016/07/tutorial-android-http-client-on-android.html
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:24.2.1'

    compile 'com.squareup.retrofit2:retrofit:2.1.0'
    compile 'com.squareup.retrofit2:converter-gson:2.1.0'
    compile "com.squareup.okhttp3:logging-interceptor:3.3.0"
}
Buat struktur projectnya sebagai berikut :


Edit dan tambahkan beberapa resources string di strings.xml berikut : 
<resources>
    <string name="app_name">AndroidLoginAndRegistration</string>
    <string name="email">Email</string>
    <string name="password">Password</string>
    <string name="login">Login</string>
    <string name="register">Register</string>
    <string name="register_caption">Dont have an account? Register</string>
    <string name="title_activity_register">RegisterActivity</string>
    <string name="first_name">First Name</string>
    <string name="last_name">Last Name</string>
    <string name="logout">Logout</string>
    <string name="greeting">Hi, %s :)</string>
</resources>
Edit dan tambahkan beberapa resources color di color.xml berikut :
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#2196F3</color>
    <color name="colorPrimaryDark">#1565C0</color>
    <color name="colorAccent">#1976D2</color>
    <color name="colorWhite">#FFFFFF</color>
    <color name="colorGray">#E5E5E5</color>
    <color name="colorText">#8A8A8A</color>
</resources>
Edit dan tambahkan beberapa resource drawable berikut :

btn_normal.xml 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@color/colorWhite"/>
    <corners android:radius="4dp" />
    <padding
        android:bottom="5dp"
        android:left="5dp"
        android:right="5dp"
        android:top="5dp" />
</shape>
btn_normal_2.xml 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@color/colorPrimary"/>
    <corners android:radius="4dp" />
    <padding
        android:bottom="5dp"
        android:left="5dp"
        android:right="5dp"
        android:top="5dp" />
</shape>
btn_pressed.xml 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@color/colorGray"/>
    <corners android:radius="4dp" />
    <padding
        android:bottom="5dp"
        android:left="5dp"
        android:right="5dp"
        android:top="5dp" />
</shape>
btn_pressed_2.xml 
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >
    <solid android:color="@color/colorPrimaryDark"/>
    <corners android:radius="4dp" />
    <padding
        android:bottom="5dp"
        android:left="5dp"
        android:right="5dp"
        android:top="5dp" />
</shape>
btn_background.xml 
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
        android:drawable="@drawable/btn_pressed" /> <!-- pressed -->
    <item android:state_focused="true"
        android:drawable="@drawable/btn_normal" /> <!-- focused -->
    <item android:drawable="@drawable/btn_normal" /> <!-- default -->
</selector>
btn_background_2.xml 
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true"
        android:drawable="@drawable/btn_pressed_2" /> <!-- pressed -->
    <item android:state_focused="true"
        android:drawable="@drawable/btn_normal_2" /> <!-- focused -->
    <item android:drawable="@drawable/btn_normal_2" /> <!-- default -->
</selector>
Selanjutnya buat beberapa layout untuk Login, Registrasi dan Dashboard berikut :

activity_login.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"
    android:windowSoftInputMode="adjustResize"
    android:background="@color/colorPrimary"
    tools:context="com.wimso.androidloginandregistration.MainActivity">

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true">

        <EditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textEmailAddress"
            android:ems="10"
            android:hint="@string/email"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:padding="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus"/>

        <EditText
            android:id="@+id/password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:ems="10"
            android:hint="@string/password"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:padding="@dimen/activity_vertical_margin"
            android:layout_marginTop="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus" />

    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true">

        <Button
            android:id="@+id/btn_login"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/login"
            android:background="@drawable/btn_background"
            android:textColor="@color/colorPrimary"/>

        <TextView
            android:id="@+id/register_caption"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="@string/register_caption"
            android:layout_marginTop="@dimen/activity_vertical_margin"
            android:gravity="center"
            android:textColor="@color/colorWhite" />

    </LinearLayout>

</RelativeLayout>

activity_register.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:windowSoftInputMode="adjustResize"
    android:background="@color/colorPrimary"
    tools:context="com.wimso.androidloginandregistration.RegisterActivity">

    <android.support.v7.widget.Toolbar
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?actionBarSize"
        android:background="?colorPrimary"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true">

        <EditText
            android:id="@+id/firstname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:hint="@string/first_name"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:ems="10"
            android:padding="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus" />

        <EditText
            android:id="@+id/lastname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPersonName"
            android:hint="@string/last_name"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:ems="10"
            android:padding="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus" />

        <EditText
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textEmailAddress"
            android:hint="@string/email"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:ems="10"
            android:padding="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus" />

        <EditText
            android:id="@+id/password"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textPassword"
            android:hint="@string/password"
            android:textColor="@color/colorWhite"
            android:textColorHint="@color/colorWhite"
            android:ems="10"
            android:padding="@dimen/activity_vertical_margin"
            android:theme="@style/WhiteFocus" />

    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true">

        <Button
            android:id="@+id/btn_register"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/register"
            android:background="@drawable/btn_background"
            android:textColor="@color/colorPrimary" />

    </LinearLayout>

</RelativeLayout>
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"
    android:windowSoftInputMode="adjustResize"
    tools:context="com.wimso.androidloginandregistration.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:orientation="vertical">

        <TextView
            android:id="@+id/greeting"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textSize="48sp"
            android:textColor="@color/colorText" />


        <TextView
            android:id="@+id/email"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="@color/colorText" />

    </LinearLayout>

    <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true">

        <Button
            android:id="@+id/btn_logout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/logout"
            android:background="@drawable/btn_background_2"
            android:textColor="@color/colorWhite"/>

    </LinearLayout>

</RelativeLayout>

Buat package network→ config lalu buat kelas dengan nama Config.java. Di kelas ini kita akan mendeklarasikan url dan endpoint pada API yang telah kita buat. Base url yang ditentukan dari IP localhost yang digunakan. 
/**
 * Created by Wim on 11/4/16.
 */
public class Config {

    public static final String BASE_URL = "YOUR IP ADDRESS"; // Your Local IP Address or Localhost (http://10.0.2.2/)

    public static final String API_URL = BASE_URL + "/simple_api";

    public static final String API_LOGIN = API_URL + "/login.php";
    public static final String API_REGISTER = API_URL + "/register.php";

}
Masih di package yang sama, buat kelas dengan nama RetrofitBuilder.java
import com.wimso.androidloginandregistration.BuildConfig;

import java.util.concurrent.TimeUnit;
import android.content.Context;

import okhttp3.Cache;
import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

/**
 * Created by Wim on 11/4/16.
 */
public class RetrofitBuilder {

    public static Retrofit builder(Context context) {
        OkHttpClient.Builder okhttpBuilder = new OkHttpClient().newBuilder();
        okhttpBuilder.connectTimeout(60, TimeUnit.SECONDS);
        okhttpBuilder.writeTimeout(60, TimeUnit.SECONDS);
        okhttpBuilder.readTimeout(60, TimeUnit.SECONDS);

        int cacheSize = 10 * 1024 * 1024;
        Cache cache = new Cache(context.getCacheDir(), cacheSize);
        okhttpBuilder.cache(cache);

        if (BuildConfig.DEBUG) {
            HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
            interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
            okhttpBuilder.addInterceptor(interceptor);
        }

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(Config.BASE_URL)
                .client(okhttpBuilder.build())
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        return retrofit;
    }
}

Dari package network, buat package interfaces kemudian tambahkan interface LoginInterface.java dan RegisterInterface.java.

LoginInterface.java 
import com.wimso.androidloginandregistration.model.User;
import com.wimso.androidloginandregistration.network.config.Config;

import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.POST;

/**
 * Created by Wim on 11/3/16.
 */
public interface LoginInterface {

    @FormUrlEncoded
    @POST(Config.API_LOGIN)
    Call<User> login(
            @Field("email") String email,
            @Field("password") String password);

}

RegisterInterface.java 
import com.wimso.androidloginandregistration.model.BaseResponse;
import com.wimso.androidloginandregistration.network.config.Config;

import retrofit2.Call;
import retrofit2.http.Field;
import retrofit2.http.FormUrlEncoded;
import retrofit2.http.POST;

/**
 * Created by Wim on 11/4/16.
 */
public interface RegisterInterface {

    @FormUrlEncoded
    @POST(Config.API_REGISTER)
    Call<BaseResponse> register(
            @Field("firstname") String firstname,
            @Field("lastname") String lastname,
            @Field("email") String email,
            @Field("password") String password);

}

Kemudian di package network buat kelas LoginService.java dan RegisterService.java berikut :

LoginService.java 
import android.content.Context;

import com.wimso.androidloginandregistration.network.config.RetrofitBuilder;
import com.wimso.androidloginandregistration.network.interfaces.LoginInterface;

import retrofit2.Callback;

/**
 * Created by Wim on 11/4/16.
 */
public class LoginService {

    private LoginInterface loginInterface;

    public LoginService(Context context) {
        loginInterface = RetrofitBuilder.builder(context)
                .create(LoginInterface.class);
    }

    public void doLogin(String email, String password, Callback callback) {
        loginInterface.login(email, password).enqueue(callback);
    }

}
RegisterService.java 
import android.content.Context;

import com.wimso.androidloginandregistration.network.config.RetrofitBuilder;
import com.wimso.androidloginandregistration.network.interfaces.RegisterInterface;

import retrofit2.Callback;

/**
 * Created by Wim on 11/4/16.
 */
public class RegisterService {

    private RegisterInterface registerInterface;

    public RegisterService(Context context) {
        registerInterface = RetrofitBuilder.builder(context)
                .create(RegisterInterface.class);
    }

    public void doRegister(String firstname, String lastname, String email, String password, Callback callback) {
        registerInterface.register(firstname, lastname, email, password).enqueue(callback);
    }

}
Kemudian buat package model yang berisi kelas model datanya sesuai dengan response json yang akan di mapping dalam bentuk kelas pojos.

Buat kelas dengan nama BaseResponse.java 
/**
 * Created by Wim on 11/4/16.
 */
public class BaseResponse {

    private boolean error;
    private String message;

    public BaseResponse() {
    }

    public boolean isError() {
        return error;
    }

    public void setError(boolean error) {
        this.error = error;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }
}

Buat kelas dengan nama User.java 
/**
 * Created by Wim on 11/4/16.
 */
public class User extends BaseResponse {

    private UserData data;

    public User() {
    }

    public UserData getData() {
        return data;
    }

    public void setData(UserData data) {
        this.data = data;
    }
}

Buat kelas dengan nama UserData.java
/**
 * Created by Wim on 11/4/16.
 */
public class UserData {

    private String firstname;
    private String lastname;
    private String email;

    public UserData() {
    }

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}
Selanjutnya buat package util kemudian buat kelas PrefUtil.java untuk menyimpan data di SharedPreferences. 
import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;

import com.google.gson.Gson;
import com.wimso.androidloginandregistration.model.User;

/**
 * Created by Wim on 11/3/16.
 */
public class PrefUtil {

    public static final String USER_SESSION = "user_session";

    public static SharedPreferences getSharedPreference(Context context) {
        return PreferenceManager.getDefaultSharedPreferences(context);
    }

    public static void putUser(Context context, String key, User user) {
        Gson gson = new Gson();
        String json = gson.toJson(user);
        putString(context, key, json);
    }

    public static User getUser(Context context, String key) {
        Gson gson = new Gson();
        String json = getString(context, key);
        User user = gson.fromJson(json, User.class);
        return user;
    }

    public static void putString(Context context, String key, String value) {
        getSharedPreference(context).edit().putString(key, value).apply();
    }

    public static String getString(Context context, String key) {
        return getSharedPreference(context).getString(key, null);
    }

    public static void clear(Context context) {
        getSharedPreference(context).edit().clear().apply();
    }

}

Buat kelas activity dengan nama LoginActivity.java untuk proses login user. 
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.text.Html;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.method.LinkMovementMethod;
import android.text.style.ClickableSpan;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import com.wimso.androidloginandregistration.model.User;
import com.wimso.androidloginandregistration.network.LoginService;
import com.wimso.androidloginandregistration.util.PrefUtil;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

/**
 * Created by Wim on 10/31/16.
 */
public class LoginActivity extends AppCompatActivity {

    private EditText emailText;
    private EditText passwordText;
    private Button btnLogin;
    private TextView registerCaption;

    private LoginService loginService;

    public static void start(Context context) {
        Intent intent = new Intent(context, LoginActivity.class);
        context.startActivity(intent);
    }

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

        if(isSessionLogin()) {
            MainActivity.start(this);
            LoginActivity.this.finish();
        }

        emailText = (EditText) findViewById(R.id.email);
        passwordText = (EditText) findViewById(R.id.password);
        btnLogin = (Button) findViewById(R.id.btn_login);
        registerCaption = (TextView) findViewById(R.id.register_caption);

        btnLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                loginAct();
            }
        });

        String caption = "Dont have an account? <b>Register</b>";
        SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder(Html.fromHtml(caption));
        spannableStringBuilder.setSpan(new ClickableSpan() {
            @Override
            public void onClick(View view) {
                RegisterActivity.start(LoginActivity.this);
            }
        }, caption.indexOf("Register") - 3, spannableStringBuilder.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        spannableStringBuilder.setSpan(new ForegroundColorSpan(Color.WHITE), caption
                .indexOf("Register") - 3, spannableStringBuilder.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        registerCaption.setText(spannableStringBuilder);
        registerCaption.setMovementMethod(LinkMovementMethod.getInstance());

    }

    void loginAct() {
        String email = emailText.getText().toString();
        String password = passwordText.getText().toString();

        if(TextUtils.isEmpty(email)) {
            emailText.setError("Email cannot be empty!");
            return;
        }

        if(TextUtils.isEmpty(password)) {
            passwordText.setError("Password cannot be empty");
            return;
        }

        loginService = new LoginService(this);
        loginService.doLogin(email, password, new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                User user = (User) response.body();

                if(user != null) {
                    if(!user.isError()) {
                        PrefUtil.putUser(LoginActivity.this, PrefUtil.USER_SESSION, user);
                        MainActivity.start(LoginActivity.this);
                        LoginActivity.this.finish();
                    }

                    Toast.makeText(LoginActivity.this, user.getMessage(), Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call call, Throwable t) {
                Toast.makeText(LoginActivity.this, "An error occurred!", Toast.LENGTH_SHORT).show();
            }
        });
    }

    boolean isSessionLogin() {
        return PrefUtil.getUser(this, PrefUtil.USER_SESSION) != null;
    }
}

Buat kelas dengan nama RegisterActivity.java untuk proses register user. 
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.text.TextUtils;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.wimso.androidloginandregistration.model.BaseResponse;
import com.wimso.androidloginandregistration.network.RegisterService;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class RegisterActivity extends AppCompatActivity {

    private Toolbar toolbar;

    private EditText firstnameText;
    private EditText lastnameText;
    private EditText emailText;
    private EditText passwordText;

    private Button btnRegister;

    private RegisterService registerService;

    public static void start(Context context) {
        Intent intent = new Intent(context, RegisterActivity.class);
        context.startActivity(intent);
    }

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

        toolbar = (Toolbar) findViewById(R.id.toolbar);

        firstnameText = (EditText) findViewById(R.id.firstname);
        lastnameText = (EditText) findViewById(R.id.lastname);
        emailText = (EditText) findViewById(R.id.email);
        passwordText = (EditText) findViewById(R.id.password);
        btnRegister = (Button) findViewById(R.id.btn_register);

        setSupportActionBar(toolbar);

        ActionBar actionBar = getSupportActionBar();
        if(actionBar != null) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }

        btnRegister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                registerAct();
            }
        });
    }

    void registerAct() {
        String firstname = firstnameText.getText().toString();
        String lastname = lastnameText.getText().toString();
        String email = emailText.getText().toString();
        String password = passwordText.getText().toString();

        if(TextUtils.isEmpty(firstname)) {
            firstnameText.setError("Firstname cannot be empty !");
            return;
        }

        if(TextUtils.isEmpty(lastname)) {
            firstnameText.setError("Lastname cannot be empty !");
            return;
        }

        if(TextUtils.isEmpty(email)) {
            firstnameText.setError("Email cannot be empty !");
            return;
        }

        if(TextUtils.isEmpty(password)) {
            firstnameText.setError("Password cannot be empty !");
            return;
        }

        registerService = new RegisterService(this);
        registerService.doRegister(firstname, lastname, email, password, new Callback() {
            @Override
            public void onResponse(Call call, Response response) {
                BaseResponse baseResponse = (BaseResponse) response.body();

                if(baseResponse != null) {
                    if(!baseResponse.isError()) {
                        LoginActivity.start(RegisterActivity.this);
                        RegisterActivity.this.finish();
                    }

                    Toast.makeText(RegisterActivity.this, baseResponse.getMessage(), Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call call, Throwable t) {
                Toast.makeText(RegisterActivity.this, "An error occurred!", Toast.LENGTH_SHORT).show();
            }
        });

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                onBackPressed();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

}
Buat kelas MainActivity.java sebagai dashboard user. 
import android.content.Context;
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.TextView;

import com.wimso.androidloginandregistration.model.User;
import com.wimso.androidloginandregistration.util.PrefUtil;

public class MainActivity extends AppCompatActivity {

    private TextView greeting;
    private TextView email;
    private Button btnLogout;

    public static void start(Context context) {
        Intent intent = new Intent(context, MainActivity.class);
        context.startActivity(intent);
    }

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

        greeting = (TextView) findViewById(R.id.greeting);
        email = (TextView) findViewById(R.id.email);
        btnLogout = (Button) findViewById(R.id.btn_logout);

        User user = PrefUtil.getUser(this, PrefUtil.USER_SESSION);

        greeting.setText(getResources().getString(R.string.greeting, user.getData().getFirstname()));
        email.setText(user.getData().getEmail());

        btnLogout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                logoutAct();

                LoginActivity.start(MainActivity.this);
                MainActivity.this.finish();
            }
        });

    }

    void logoutAct() {
        PrefUtil.clear(this);
    }
}

Terakhir adalah tambahkan permission internet di AndroidManifest.xml 
<uses-permission android:name="android.permission.INTERNET" />
Build dan jalankan maka hasilnya sebagai berikut :




Source code lengkap dapat dilihat di https://github.com/wimsonevel/AndroidLoginAndRegistration

Sekian tutorial dari saya kali ini.
Semoga bermanfaat.

Happy Coding :)
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