Android User Login and Registration with Retrofit, Php, MySql and Slim Framework

In this android tutorial, we are going to learn how we can implement android user login and registration with retrofit, Php, MySql and Slim framework. This topic might sound as if a lot is going on but if you follow the tutorial to the end you will learn how you can combine different technologies to achieve your aim.

Retrofit is a type-safe REST client for Android built by Square. The library provides a powerful framework for authenticating and interacting with APIs and sending network requests with OkHttp.

This library makes downloading JSON or XML data from a web API fairly straightforward. Once the data is downloaded then it is parsed into a Plain Old Java Object (POJO) which must be defined for each “resource” in the response.

We are going to create an android user login and registration. We will create an API endpoints which our android client application will make call to and use the response data received to execute further actions.

I wrote initial android tutorial on Android User Login and Registration. I will suggest you have a look at it before you continue with this tutorial.

We are going to consume our user registration data using android retrofit library. Retrofit is one of the best android library for network applications.

If you are interested in android OkHttp library tutorial, I wrote the following tutorial on ANDROID PUSH NOTIFICATIONS USING GOOGLE CLOUD MESSAGING (GCM), PHP, MYSQL AND OKHTTP and I think it will interest you.

Right now it is important for us to understand what we are planning to achieve in this tutorial. The screen-shot of our project is shown below.

We will create a simple database that will contain a single table called user. The user table will contain user registration information. If you don’t have a remote database server you can as well use a local server like WAMP. The sql code below will create the user table in our database.

CREATE TABLE IF NOT EXISTS `user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `email` varchar(300) DEFAULT NULL,
  `password` varchar(300) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=latin1 AUTO_INCREMENT=0 ;

Database Connect with web server application

Now, we are going to connect our web application to our database server so that the information stored in the database can be access in the web application.

Create your application root folder called api for our web application. Inside the api root folder, create a configuration file called config.php. Copy and paste the below code inside the file. Don’t forget to enter your database server access details

config.php

<?php

 define("DB_HOST", " ");
 define("DB_USER", " ");
 define("DB_PASSWORD", " ");
 define("DB_NAME", " "); 

?>

Create another file called db.php which will return the instance of our database.

db.php

<?php
include_once 'config.php';

class DbConnect{	
	
	private $connect;	
	
	public function __construct(){
		
		$this->connect = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
		 
		if (mysqli_connect_errno($this->connect))
		{
			echo "Failed to connect to MySQL: " . mysqli_connect_error();  
		}
	}
	
	public function getDb(){
		
		return $this->connect;
	}	
}

?>

We are going to create a separate class that will contain the methods we will use in our REST API. Create a file called database.php. Copy and paste the below code in this file.

Database.php

<?php

include_once 'db.php';

 class DatabaseLayer{ 			
	
	public function __constructor(){
	}
	
	public function isUserExist($email, $password){
		$dbObject = new DbConnect();
		$sql = "Select * from user where email = $email and password = $password limit 1";
		$result = mysqli_query($dbObject->getDb(), $sql);
		if(count($result) > 0){
			return true;
		}
		return false;		
	}
	
	public function addNewUser($email, $password){
		$dbObject = new DbConnect();
		if(!$this->isUserExist($email, $password)){
			$sql = "Insert into user (email, password) values ('$email', '$password')";
			$result = mysqli_query($dbObject->getDb(), $sql);
			if($result){
				return true;
		    }
		    return false;		
		}
	}
	
}
	
?>

Creating Web API with Slim 2 Php Framework

Instead of writing our own API from scratch, it is better for us to use a well tested open source Php framework that basically do what we planned to achieve.

If you have not heard of Php Slim framework, you can read more here. Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.

To install and use this framework, you can just download it in their website and following the installation instruction or you can install Slim with Composer. If you don’t have Composer installed in your system, you can head over to getcomposer.org  to download and follow the installation instruction.

Create a new file in the root directory called composer.json and add the following lines of code.

Composer.json

{
    "require": {
        "slim/slim": "2.*"
    }
}

Open you command line application as an administrator and execute the following line of code.

Composer install

We will create a new index.php file in the root directory of our project. Add the following line of code to it first.

require ‘vendor/autoload.php‘

The downloaded Slim framework is added inside a new created folder called vendor. The vendor folder is where Composer store all the dependency modules used in the project.

We are going to create two endpoints for our API. For example.

GET – http://localhost/api/email/password. For login process

POST – http://localhost/api/email/password. For registration process

Create the index.php file. Copy and paste below code in the file.

Index.php

<?php
require 'vendor/autoload.php';
include_once 'database.php';

$app = new SlimSlim();

$app->get('/:email/:password', function($email, $password){
	
	$password = md5($password);
	
	$databaseObject = new DatabaseLayer();
	$isRegistered = $databaseObject->isUserExist($email, $password);
	
	$app = SlimSlim::getInstance();
	
	if($isRegistered){
		$app->response->setStatus('200');	
		$app->response->headers->set('Content_Type', 'application/json');	
		echo json_encode(Array('isLogin' => '1'));
		
	}else{
		echo json_encode(Array('isLogin' => '0'));
	}
	
});

$app->post('/:email/:password', function($email, $password){
	$password = md5($password);
	
	$app = SlimSlim::getInstance();
	
	$databaseObject = new DatabaseLayer();
	$isInserted = $databaseObject->addNewUser($email, $password);
	
	if($isInserted){
		$app->response->setStatus('200');	
		$app->response->headers->set('Content_Type', 'application/json');	
		echo json_encode(Array('isLogin' => '1'));
	}else{
		echo json_encode(Array('isLogin' => '0'));
	}
 
});

$app->run();

?>

You can see the two functions above, one for the GET request and the other for the POST request.

We can test our GET request directly in the browser by passing the parameters to the base url pointing to our API.

For the POST request, you can download a Google Chrome extension call Chrome Poster which allow you to interact with your web server.

It is time to move over to the android client app. We are going to creating android application that will consume our web API and used it for user registration and login.

Android Client App

Before we start, it is important for you to understand the tools and environment I used in this android tutorial. Feel free to use tools you are familiar with.

Windows 7

Android Studio

Sony Xperia ZL

Min SDK 14

Target SDK 23

To create a new android application project, following the steps as stipulated below.

Go to File menu

Click on New menu

Click on Android Application

Enter Project name: AndroidUserLoginWithRetrofit

Package: com.inducesmile.androiduserloginwithretrofit

Select Login Activity

Keep other default selections

Continue to click on next button until Finish button is active, then click on Finish Button.

If you are using Android Studio as your choice IDE, the new project will create a default

LoginActivity.java file and its corresponding layout file.

Since we are going to use android retrofit library for our network call, open the app build.gradle and add the following lines of code to the dependency section.

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'com.android.support:design:23.1.1'
    compile 'com.google.code.gson:gson:2.6.1'
    compile 'com.squareup.retrofit2:retrofit:2.0.0-beta4'
    compile 'com.squareup.retrofit2:converter-gson:2.0.0-beta4'
    compile 'com.squareup.okhttp3:okhttp:3.1.2'
}

You can see that apart from retrofit, we also add OkHttp and Gson libraries. Retrofit is built on top of OkHttp. The Gson library is use as a converter factory to serialize and deserialize JSON data

Since retrofit 2, the following converter can be used also

Jackson – com.squareup.retrofit2:converter-jackson:2.0.0-beta4

Moshi – com.squareup.retrofit2:converter-moshi:2.0.0-beta4

Protobuf – com.squareup.retrofit2:converter-protobuf:2.0.0-beta4

Wire – com.squareup.retrofit2:converter-wire:2.0.0-beta4

Simple XML – com.squareup.retrofit2:converter-simplexml:2.0.0-beta4

Mainfest.xml

Since we are making a network call, we are going to add Internet permission in our application Manifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.inducesmile.androidloginwithretrofit">
    <uses-permission android:name="android.permission.INTERNET" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".LoginActivity"
            android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity android:name=".MainActivity"></activity>
    </application>
</manifest>

Colors.xml

Open the colors.xml file located in the values folder and add these lines of code.

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#3F51B5</color>
    <color name="colorPrimaryDark">#303F9F</color>
    <color name="colorAccent">#FF4081</color>
    <color name="colorBlack">#000000</color>
</resources>

Feel free to choose any color you might be interested to use.

Strings.xml

The default and some of the string values we will add in our application are stored in the strings.xml file located in the values folder. Open the file, copy and paste the following code in the file.

<resources>
    <string name="app_name">Android Login With Retrofit</string>
    <!-- Strings related to login -->
    <string name="prompt_email">Email</string>
    <string name="prompt_password">Password </string>
    <string name="registration_button">Register</string>
    <string name="action_sign_in">Sign in</string>
    <string name="action_sign_in_short">Sign in</string>
    <string name="error_invalid_email">This email address is invalid</string>
    <string name="error_invalid_password">This password is too short</string>
    <string name="error_incorrect_password">This password is incorrect</string>
    <string name="error_field_required">This field is required</string>
    <string name="permission_rationale">Contacts permissions are needed for providing email completions.</string>
    <string name="no_text"> </string>
    <string name="registration_message">You are not registered yet. Use the registration button to complete your registration.</string>
    <string name="registration_failed">Your email or password is already in use</string>
    <string-array name="autocomplete">
        <item>johnpaul@yahoo.com</item>
        <item>marykate@yahoo.com</item>
        <item>kelvinjames@yahoo.com</item>
        <item>henrysweart@gmail.com</item>
        <item>gracepowell@yahoo.com</item>
    </string-array>
</resources>

Lets create the MainActivity.java file. This Activity page will server as the first page a user will see when successfully login. It is going to be simple. The layout file for this Activity will only contain a single TextView control which will display user login email address.

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.inducesmile.androidloginwithretrofit.MainActivity">
    <TextView
        android:id="@+id/login_email"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/app_name"
        android:textColor="@color/colorBlack"
        android:layout_margin="16dp"
        android:textSize="16dp"
        android:textStyle="bold"
        android:gravity="center|center_horizontal"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

The MainActivity class will instantiate the TextView control using the findViewById(int k) method of the Activity class. The object of the TextView’s text component is set with the data (User login email address) obtained from the intent extra data as parameter.

Open the MainActivity.java file, copy and paste the code below to the file.

MainActivity.java

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String myLoginEmailAddress = getLoginEmailAddress();
        TextView loginInformation = (TextView)findViewById(R.id.login_email);
        if(myLoginEmailAddress != null || !myLoginEmailAddress.equals("")){
            loginInformation.setText("Welcome!!! You have logged in as " + myLoginEmailAddress);
        }else {
            loginInformation.setText("Your login email is missing");
        }
    }
    private String getLoginEmailAddress(){
        String storedEmail = "";
        Intent mIntent = getIntent();
        Bundle mBundle = mIntent.getExtras();
        if(mBundle != null){
            storedEmail = mBundle.getString("EMAIL");
        }
        return storedEmail;
    }
}

We will modify the default activity_login.xml file create by Android Studio when we select LoginActivity default template. We are going to add one Button and one TextView controls.

The new Button view will be used for registration while the TextView is used to display login denial message.

Open the activity_login.xml file located in the layout folder. Copy and paste the following code inside this file.

activity_login.xml

<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:gravity="center_horizontal"
    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"
    tools:context="com.inducesmile.androidloginwithretrofit.LoginActivity">
    <!-- Login progress -->
    <ProgressBar
        android:id="@+id/login_progress"
        style="?android:attr/progressBarStyleLarge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:visibility="gone" />
    <ScrollView
        android:id="@+id/login_form"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none">
        <LinearLayout
            android:id="@+id/email_login_form"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <AutoCompleteTextView
                    android:id="@+id/email"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_email"
                    android:inputType="textEmailAddress"
                    android:maxLines="1"
                    android:singleLine="true" />
            </android.support.design.widget.TextInputLayout>
            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <EditText
                    android:id="@+id/password"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:hint="@string/prompt_password"
                    android:imeActionId="@+id/login"
                    android:imeActionLabel="@string/action_sign_in_short"
                    android:imeOptions="actionUnspecified"
                    android:inputType="textPassword"
                    android:maxLines="1"
                    android:singleLine="true" />
            </android.support.design.widget.TextInputLayout>
            <Button
                android:id="@+id/email_sign_in_button"
                style="?android:textAppearanceSmall"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="@string/action_sign_in"
                android:textColor="@color/colorBlack"
                android:textStyle="bold" />
            <Button
                android:id="@+id/registration_button"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:text="@string/registration_button"
                android:textColor="@color/colorBlack"
                android:textStyle="bold"/>
            <TextView
                android:id="@+id/failed_login"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="@color/colorPrimaryDark"
                android:layout_margin="24dp"
                android:textSize="16sp"
                android:text="@string/no_text"/>
        </LinearLayout>
    </ScrollView>
</LinearLayout>

Before we open the LoginActivity.java, it is important for us to understand how we are going to setup the android retrofit library. For a thorough understanding of what retrofit is all about I will suggest you read their GitHub webpage.

We are going to create our APIService. This is use to create annotation of the query string which is used for the remote call.

Understanding how to map your URL with the corresponding API endpoints is the challenging part of learning android retrofit.

We will create an Interface file in our project called ApiInterface.java.

ApiInterface.java

Open the file, copy and paste the following code in the file.

import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.POST;
import retrofit2.http.Path;
public interface ApiInterface {
    @GET("api/{email}/{password}")
    Call<Login> authenticate(@Path("email") String email, @Path("password") String password);
    @POST("api/{email}/{password}")
    Call<Login> registration(@Path("email") String email, @Path("password") String password);
}

As you can see, we are using the GET request annotation with parameters we are going to pass to the base URL of the web API we are planning to access. You can find more information about this annotation in the guide I referenced above.

Finally, lets move over to the LoginActivity class to understand how we can tie all these together and achieve our purpose.

I have created this method below.

private ApiInterface getInterfaceService() {
    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(BASE_URL)
            .addConverterFactory(GsonConverterFactory.create())
            .build();
    final ApiInterface mInterfaceService = retrofit.create(ApiInterface.class);
    return mInterfaceService;
}

An instance of retrofit object was built and thereafter, we use this object to create a service by pass our ApiInterface class as a parameter to retrofit create method.

The returned service object is then use to call any of the methods declared in the ApiInterface.java file

Since you can use retrofit for both asynchronous and synchronous call, we will focus on asynchronous call since the response object will be used to update some of our UI View controls.

We will call the enqueue() method which uses a callback class and override methods for the response object and on failure error message.

The complete code for the LoginActivity.java file is shown below.

LoginActivity.java

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.TextUtils;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends AppCompatActivity {
    private final String TAG = "LoginActivity";
    public static final String BASE_URL = "http://nigerianstudentshop.com/";
    // UI references.
    private AutoCompleteTextView mEmailView;
    private EditText mPasswordView;
    private View mProgressView;
    private View mLoginFormView;
    private TextView failedLoginMessage;
    View focusView = null;
    private String email;
    private String password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        // Set up the login form.
        mEmailView = (AutoCompleteTextView) findViewById(R.id.email);
        populateAutoComplete();
        failedLoginMessage = (TextView)findViewById(R.id.failed_login);
        mPasswordView = (EditText) findViewById(R.id.password);
        mPasswordView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.login || id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });
        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
        mEmailSignInButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                failedLoginMessage.setText("");
                attemptLogin();
            }
        });
        Button registrationButton = (Button)findViewById(R.id.registration_button);
        registrationButton.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                attemptRegistration();
            }
        });
        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
    }
    private void attemptRegistration(){
        boolean mCancel = this.loginValidation();
        if (mCancel) {
            focusView.requestFocus();
        } else {
            registrationProcessWithRetrofit(email, password);
        }
    }
    private void attemptLogin(){
        boolean mCancel = this.loginValidation();
        if (mCancel) {
            focusView.requestFocus();
        } else {
            loginProcessWithRetrofit(email, password);
        }
    }
    private boolean loginValidation() {
        // Reset errors.
        mEmailView.setError(null);
        mPasswordView.setError(null);
        // Store values at the time of the login attempt.
        email = mEmailView.getText().toString();
        password = mPasswordView.getText().toString();
        boolean cancel = false;
        // Check for a valid password, if the user entered one.
        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
            mPasswordView.setError(getString(R.string.error_invalid_password));
            focusView = mPasswordView;
            cancel = true;
        }
        // Check for a valid email address.
        if (TextUtils.isEmpty(email)) {
            mEmailView.setError(getString(R.string.error_field_required));
            focusView = mEmailView;
            cancel = true;
        } else if (!isEmailValid(email)) {
            mEmailView.setError(getString(R.string.error_invalid_email));
            focusView = mEmailView;
            cancel = true;
        }
        return cancel;
    }
    private void populateAutoComplete(){
        String[] countries = getResources().getStringArray(R.array.autocomplete);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,countries);
        mEmailView.setAdapter(adapter);
    }
    private boolean isEmailValid(String email) {
        //TODO: Replace this with your own logic
        return email.contains("@");
    }
    private boolean isPasswordValid(String password) {
        //TODO: Replace this with your own logic
        return password.length() > 4;
    }
    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }
    private ApiInterface getInterfaceService() {
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(BASE_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        final ApiInterface mInterfaceService = retrofit.create(ApiInterface.class);
        return mInterfaceService;
    }
    private void loginProcessWithRetrofit(final String email, String password){
        ApiInterface mApiService = this.getInterfaceService();
        Call<Login> mService = mApiService.authenticate(email, password);
        mService.enqueue(new Callback<Login>() {
            @Override
            public void onResponse(Call<Login> call, Response<Login> response) {
                Login mLoginObject = response.body();
                String returnedResponse = mLoginObject.isLogin;
                Toast.makeText(LoginActivity.this, "Returned " + returnedResponse, Toast.LENGTH_LONG).show();
                //showProgress(false);
                if(returnedResponse.trim().equals("1")){
                    // redirect to Main Activity page
                    Intent loginIntent = new Intent(LoginActivity.this, MainActivity.class);
                    loginIntent.putExtra("EMAIL", email);
                    startActivity(loginIntent);
                }
                if(returnedResponse.trim().equals("0")){
                    // use the registration button to register
                    failedLoginMessage.setText(getResources().getString(R.string.registration_message));
                    mPasswordView.requestFocus();
                }
            }
            @Override
            public void onFailure(Call<Login> call, Throwable t) {
                call.cancel();
                Toast.makeText(LoginActivity.this, "Please check your network connection and internet permission", Toast.LENGTH_LONG).show();
            }
        });
    }
    private void registrationProcessWithRetrofit(final String email, String password){
        ApiInterface mApiService = this.getInterfaceService();
        Call<Login> mService = mApiService.registration(email, password);
        mService.enqueue(new Callback<Login>() {
            @Override
            public void onResponse(Call<Login> call, Response<Login> response) {
                Login mLoginObject = response.body();
                String returnedResponse = mLoginObject.isLogin;
                //showProgress(false);
                if(returnedResponse.trim().equals("1")){
                    // redirect to Main Activity page
                    Intent loginIntent = new Intent(LoginActivity.this, MainActivity.class);
                    loginIntent.putExtra("EMAIL", email);
                    startActivity(loginIntent);
                }
                if(returnedResponse.trim().equals("0")){
                    // use the registration button to register
                    failedLoginMessage.setText(getResources().getString(R.string.registration_failed));
                    mPasswordView.requestFocus();
                }
            }
            @Override
            public void onFailure(Call<Login> call, Throwable t) {
                call.cancel();
                Toast.makeText(LoginActivity.this, "Please check your network connection and internet permission", Toast.LENGTH_LONG).show();
            }
        });
    }
}

Login Class

Create a new java file called Login.java. Open the class and add the code below to it

public class Login {
    public String isLogin;
}

This brings us to the end of this tutorial, If you find anything confusing kindly contact me with your questions or use the comment box below.

Now, when you run your application you will see the interface that looks similar to the sample that was shown earlier on.

You can download the code for this tutorial below. If you are having hard time downloading the tutorials, kindly contact me.

Retrofit 9.36 MB

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