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How to Make Email Validation in Flutter – Using Email Validator Library

By
Rajat Palankar
-
0
Flutter Email Validation library
Hi Guys, Welcome to Proto Coders Point,  In this Flutter Tutorial we will integrate Flutter library called Email Validator to validate email address.

Email Validation

Usually Email Validation is done, by a String value that contains alphabets, @ symbols and a .(dot) symbol For Example: contact@protocoderspoint.com, This email address contains all the characters required to be a perfect/valid email address.

Flutter Email Validation Library

Flutter Comes with awesome and easy to use flutter Library/Plugins. This Email validation flutter library is pre defined class that validated email addresses. You just need to call its class. This plugin is very easy to use and understand. Visit official site to learn more here Let’s start adding the library in our Flutter Project.

Adding Dependencies in our project

Open Pubspec.yaml and add the dependencies 
dependencies:
  email_validator: ^1.0.4 // add this line

Import the email validator dart class

you need to import the email_validator.dart file, where you want to make use validator library. In my case i have imported it in main.dart file 
import 'package:email_validator/email_validator.dart';
And their you go now you can use the library.

Snippet Code Example how to use it

    const String email = 'contact@protocoderspoint.com';
    final bool isValid = EmailValidator.validate(email);

    print('Email is valid? ' + (isValid ? 'yes' : 'no'));
The above code is snippet code, Their is a string that holds email address, a boolen type variable that stored true or false based on email address, is the email is valid it will store true else false. (isValid ? ‘yes’ : ‘no’) :  is similar to if else statement.

Complete code on Email Validation in flutter

In my flutter project i have 2 dart files. main.dart is with TextFormField() where we will check if email is valid, if entered email is valid that the user will be navigated to page2.dart main.dart Copy paste the below code in main.dart 
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:email_validator/email_validator.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'page2.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.yellow,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final _emailcontroller = TextEditingController();
  bool isvalid = false;

  @override
  Widget build(BuildContext context) {
    double width = MediaQuery.of(context).size.width;
    return Scaffold(
      appBar: AppBar(
        title: Text("Email Validate Example"),
      ),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Center(
          child: Column(
            children: <Widget>[
              Text(
                "Example on Email Validation",
                style: TextStyle(
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                    fontStyle: FontStyle.italic),
              ),
              Container(
                height: 10,
              ),
              TextFormField(
                controller: _emailcontroller,
                decoration: InputDecoration(
                    labelText: "Email",
                    labelStyle: TextStyle(color: Colors.blue),
                    focusedBorder: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.red),
                        borderRadius: BorderRadius.circular(10.0)),
                    enabledBorder: OutlineInputBorder(
                        borderSide: BorderSide(color: Colors.red),
                        borderRadius: BorderRadius.circular(10.0))),
              ),
              SizedBox(
                height: 10,
              ),
              RaisedButton(
                onPressed: () {
                  isvalid = EmailValidator.validate(_emailcontroller.text);
                  if (isvalid) {
                    Navigator.push(context,
                        MaterialPageRoute(builder: (context) => Page2()));
                  } else {
                    Fluttertoast.showToast(
                        msg: "Please Enter a valid Email",
                        toastLength: Toast.LENGTH_SHORT,
                        gravity: ToastGravity.BOTTOM,
                        timeInSecForIos: 1,
                        backgroundColor: Colors.red,
                        textColor: Colors.white,
                        fontSize: 16.0);
                  }
                },
                child: Container(
                  width: width * 0.5,
                  child: Center(
                    child: Text(
                      "Submit",
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
                color: Colors.blue,
              ),
            ],
          ),
        ),
      ),
    );
  }
}
page2.dart Create a new dart page in lib folder of your flutter project and add below code. the below code is simply a UI where we show a Text. 
import 'package:flutter/material.dart';

class Page2 extends StatefulWidget {
  @override
  _Page2State createState() => _Page2State();
}

class _Page2State extends State<Page2> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Email Validator Flutter plugin"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text("Email Address is validate"),
          ],
        ),
      ),
    );
  }
}
Check out Similar Articles on Validation Flutter Password Validation Flutter Form Validation Flutter Email Validation using plugin Flutter Email Regex Pattern

Flutter Sqlite Tutorial using Flutter Sqflite library with example

By
Rajat Palankar
-
0
Flutter SqfLite database Insert, Update, Delete

Hi Guys, Welcome to Proto Coders Point, In this Flutter Tutorial we will learn how to use SQLITE in Flutter.

What is SQLite ?

SQLite is a Database Library that provides a relational database management system(RDBMS). Here Lite means a very light weight process in term of setup or administration.

Sqlite have very awesome feature : Zero Configuration, Transactional management, Serverless database support and much more.

Flutter SQLite is very small  as small as 400kb in size.

SQLite Source code is open for all the developers any one can use then to develop a data storage.

Now a day’s SQLite are mostly use in storing data locally

For Example : A user plays a games with is completely offline, So all Hs data will be stored in SQLITE DATABASE Locally.

Let’s Start adding the Required Dependencies into our Flutter Project.

Flutter Sqflite library Adding dependencies

Step1: Open Pubspec.yaml file and add dependencies

dependencies:
  sqflite: ^1.3.0 // add this line

NOTE : Latest feature might get added in this flutter plugin so better check out official site for latest version.

Step2: Import Sqlite dart file

Once you have added the dependencies, Now you can easily user the sqlite packages in your flutter project by just importing the dart file.

import 'package:sqflite/sqflite.dart';

How to create a Sqlite Database in Flutter?

Opening a database

Get location of database using getdatabasepath() method.

var databasesPath = await getDatabasesPath();
String path = join(databasesPath, 'student.db');
var db = await openDatabase(path);

here path is a string variable where our database path is been stored.

Closing database which is open.
await db.close();
Opening the database and creating a new TABLE in it.
Database database = await openDatabase(path, version: 1,
    onCreate: (Database db, int version) async {
  await db.execute(
      'CREATE TABLE USER (id INTEGER PRIMARY KEY AUTOINCREMENT, username TEXT, ID INTEGER)');
});

Here in above example i have opened the database and created a new table called as USER.

Ok Now let’s implement SQFLite in our Flutter Application

Flutter Sqlite Tutorial with INSERT, UPDATE and DELETE Option.

Create a new Dart file which is actually an SQLITE_DBHelper

Project file > lib (right click) > New > Dart 

create a file and name it as SQLITE_DBHelper.dart

creating new file sqlite db helper

and copy paste below database helper code.

import 'package:flutter/cupertino.dart';
import 'dart:async';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';

class DBStudentManager {
  Database _datebase;

  Future openDB() async {
    if (_datebase == null) {
      _datebase = await openDatabase(
          join(await getDatabasesPath(), "student.db"),
          version: 1, onCreate: (Database db, int version) async {
        await db.execute(
            "CREATE TABLE student(id INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT,course TEXT)");
      });
    }
  }

  Future<int> insertStudent(Student student) async {
    await openDB();
    return await _datebase.insert('student', student.toMap());
  }

  Future<List<Student>> getStudentList() async {
    await openDB();
    final List<Map<String, dynamic>> maps = await _datebase.query('student');

    return List.generate(maps.length, (index) {
      return Student(
          id: maps[index]['id'],
          name: maps[index]['name'],
          course: maps[index]['course']);
    });
  }

  Future<int> updateStudent(Student student) async {
    await openDB();
    return await _datebase.update('student', student.toMap(),
        where: 'id=?', whereArgs: [student.id]);
  }

  Future<void> deleteStudent(int id) async {
    await openDB();
    await _datebase.delete("student", where: "id = ? ", whereArgs: [id]);
  }
}

class Student {
  int id;
  String name;
  String course;

  Student({ @required this.name, @required this.course,this.id});
  Map<String, dynamic> toMap() {
    return {'name': name, 'course': course};
  }
}

Now you have database helper class that returns all the data you request from main class.

main.dart

Replace all the default code with below code in main.dart file

import 'package:flutter/material.dart';
import 'MyDBManager.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final DBStudentManager dbStudentManager = new DBStudentManager();
  final _nameController = TextEditingController();
  final _courseController = TextEditingController();
  final _formkey = new GlobalKey<FormState>();
  Student student;
  int updateindex;

  List<Student> studlist;

  @override
  Widget build(BuildContext context) {
    double width = MediaQuery.of(context).size.width;
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter Sqflite Example"),
      ),
      body: ListView(
        children: <Widget>[
          Form(
            key: _formkey,
            child: Padding(
              padding: const EdgeInsets.all(12.0),
              child: Column(
                children: <Widget>[
                  TextFormField(
                    decoration: InputDecoration(labelText: "Name"),
                    controller: _nameController,
                    validator: (val) =>
                        val.isNotEmpty ? null : "Name Should not be Empty",
                  ),
                  TextFormField(
                    decoration: InputDecoration(labelText: "Course"),
                    controller: _courseController,
                    validator: (val) =>
                        val.isNotEmpty ? null : "Course Should not be Empty",
                  ),
                  RaisedButton(
                    textColor: Colors.white,
                    color: Colors.lightBlue,
                    child: Container(
                        width: width * 0.9,
                        child: Text(
                          "Submit",
                          textAlign: TextAlign.center,
                        )),
                    onPressed: () {
                      submitStudent(context);
                    },
                  ),
                  FutureBuilder(
                    future: dbStudentManager.getStudentList(),
                    builder: (context, snapshot) {
                      if (snapshot.hasData) {
                        studlist = snapshot.data;
                        return ListView.builder(
                          shrinkWrap: true,
                          itemCount: studlist == null ? 0 : studlist.length,
                          itemBuilder: (BuildContext context, int index) {
                            Student st = studlist[index];
                            return Card(
                              child: Row(
                                children: <Widget>[
                                  Padding(
                                    padding: const EdgeInsets.all(16.0),
                                    child: Container(
                                      width: width * 0.50,
                                      child: Column(
                                        children: <Widget>[
                                          Text('ID: ${st.id}'),
                                          Text('Name: ${st.name}'),
                                        ],
                                      ),
                                    ),
                                  ),
                                  IconButton(
                                    onPressed: () {
                                      _nameController.text = st.name;
                                      _courseController.text = st.course;
                                      student = st;
                                      updateindex = index;
                                    },
                                    icon: Icon(
                                      Icons.edit,
                                      color: Colors.blue,
                                    ),
                                  ),
                                  IconButton(
                                    onPressed: () {
                                      dbStudentManager.deleteStudent(st.id);
                                      setState(() {
                                        studlist.removeAt(index);
                                      });
                                    },
                                    icon: Icon(
                                      Icons.delete,
                                      color: Colors.red,
                                    ),
                                  ),
                                ],
                              ),
                            );
                          },
                        );
                      }
                      return CircularProgressIndicator();
                    },
                  )
                ],
              ),
            ),
          )
        ],
      ),
    );
  }

  void submitStudent(BuildContext context) {
    if (_formkey.currentState.validate()) {
      if (student == null) {
        Student st = new Student(
            name: _nameController.text, course: _courseController.text);
        dbStudentManager.insertStudent(st).then((value) => {
              _nameController.clear(),
              _courseController.clear(),
              print("Student Data Add to database $value"),
            });
      } else {
        student.name = _nameController.text;
        student.course = _courseController.text;

        dbStudentManager.updateStudent(student).then((value) {
          setState(() {
            studlist[updateindex].name = _nameController.text;
            studlist[updateindex].course = _courseController.text;
          });
          _nameController.clear();
          _courseController.clear();
          student = null;
        });
      }
    }
  }
}

And there your app is ready to open a datebase/ create a new database , create a new table and store all the data in it and even delete or update the present data base using Sqflite flutter library.

Flutter date time picker library with example

By
Rajat Palankar
-
1

Hi Guys, Welcome to Proto Coders Point, In this Flutter Tutorial we gonna implement datetime picker flutter library.

Brief about date time picker library

A date time picker is a widget library using which your flutter app user can easily select date or time.

This library comes with different set of languages :

Some of them are : Arabic(ar), Armenian(hy) , Azerbaijan(az) ,Chinese(zh) , Dutch(nl) ,English(en) and much more ( Visit official site to know more ).

Ok then Let’s start implementing the date time library in our flutter project.

Step 1: Add the Dependencies

Navigate towords / open pubspec.yaml

Then add the following date time picker dependencies, what this does it that it downloads all the required packages  into our flutter project as External Libraries.

dependencies:
  flutter_datetime_picker: ^1.3.5 //add this line

Then, after adding the dependencies just click on Packages Get.

Step 2: Import the package

once you have added dependencies all the package will be stored in external libraries if you want to use them you need to import the required package

For example : if you want to use the library in main.dart file you need to import it.

import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';

Time picker snippet code

DatePicker.showTime12hPicker(context,
                   showTitleActions: true,
                   currentTime: DateTime.now(), onConfirm: (time) {
                 setState(() {
                   pickedtime = "Picked time is : ${time.hour} : ${time.minute} : ${time.second}";
                 });

DateTime.now() function will fetch the current time from the users mobile phone and store it in time variable.

time picker flutter ui

you can access the time based on your requirement

For example:

Suppose you have time format as : 07 : 50 : 00

time.hour will return : 7

time.minute will return : 50

time.second will return : 00

Date Picker Snippet code

DatePicker.showDatePicker(context,
                        showTitleActions: true,
                        minTime: DateTime(2018, 3, 5),
                        maxTime: DateTime(2026, 6, 7), onChanged: (date) {
                      print('change $date');
                      setState(() {
                        pickeddate = "${date.day}";
                      });
                    }, onConfirm: (date) {
                      print('confirm $date');
                      setState(() {
                        pickeddate =
                            "Picked Date is : ${date.day}/${date.month}/${date.year}";
                      });
                    }, currentTime: DateTime.now(), locale: LocaleType.en);

In date picker you have properties such as:

date picker flutter ui design

minTime : where you can set starting range of date picker in flutter.

maxTime : Where you can set upto or max range of date picker in flutter.

date can accessed in 3 different ways 

those are : day, month, year.

Complete Source code for date time picker library

Copy Paste below lines of code in main.dart file

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  var pickeddate;
  var pickedtime;
  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Flutter Date time Picker"),
        ),
        body: Center(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              SizedBox(
                height: 50.0,
              ),
              FloatingActionButton.extended(
                onPressed: () {
                  DatePicker.showTime12hPicker(context,
                      showTitleActions: true,
                      currentTime: DateTime.now(), onConfirm: (time) {
                    setState(() {
                      pickedtime =
                          "Picked time is : ${time.hour} : ${time.minute} : ${time.second}";
                    });
                  });
                },
                label: Text("Set Time"),
                icon: Icon(Icons.timer),
              ),
              SizedBox(
                height: 25,
              ),
              FloatingActionButton.extended(
                onPressed: () {
                  DatePicker.showDatePicker(context,
                      showTitleActions: true,
                      minTime: DateTime(2018, 3, 5),
                      maxTime: DateTime(2026, 6, 7), onChanged: (date) {
                    print('change $date');
                    setState(() {
                      pickeddate = "${date.day}";
                    });
                  }, onConfirm: (date) {
                    print('confirm $date');
                    setState(() {
                      pickeddate =
                          "Picked Date is : ${date.day}/${date.month}/${date.year}";
                    });
                  }, currentTime: DateTime.now(), locale: LocaleType.en);
                },
                label: Text("Set Date"),
                icon: Icon(Icons.date_range),
              ),
              SizedBox(
                height: 50,
              ),
              Container(
                child: (pickeddate == null)
                    ? Text("Select a date Please")
                    : Text("$pickeddate"),
              ),
              SizedBox(
                height: 30,
              ),
              Container(
                child: (pickedtime == null)
                    ? Text("Select a time Please")
                    : Text("$pickedtime"),
              ),
            ],
          ),
        ));
  }
}

Then you flutter app is ready with feature to pick date time in flutter app.

The easiest way to implement image picker in flutter using library example

By
Rajat Palankar
-
0
image picker in flutter
image picker in flutter

Hi Guys, Welcome to Proto Coders Point, In this Flutter tutorial we gonna learn how to use the image picker flutter library a package that helps getimage/flutter pick images from a gallery or camera.

Image Picker flutter library

A Flutter Plugin library for both iOS and Android that is been used to pick an images from mobile phone gallery or even you can take a new photo with the camera.

let’s straight away start implement the flutter image picker in our flutter app.

find the latest version of Image picker from official site.

VIDEO TUTORIAL

Step 1: Adding image picker dependency flutter in to our flutter project

Once you have created a new Flutter project or open your existing flutter project to implement image picker flutter library.

Then you need to add image picker dependencies,

Open pubspec.yaml  then add the below lines

dependencies:
  image_picker: ^0.6.3+4 //add this line in pubspec.yaml file

Step 2: Import image_picker.dart file in main.dart

Now, as you have added the required library in your project now you need to import the picker library wherever required.

import 'package:image_picker/image_picker.dart';

For Example : In my case i have imported the library in main.dart file whcih is my main activity screen.

Step 3: Configuration

1. ANDROID IMAGE PICKER CONFIGURATION

When it comes to android their is no configuration required – the plugin should work out of the box.

Just we need to set request Legacy External Storage to true Android > app > src > main >AndroidManifest.xml

By adding the above request Legacy External Strorage the app will auto ask user to grant permission to make use of storage.

2. IOS IMAGE PICKER CONFIGURATION

Add the following keys to your Info.plist file, located in

Project > ios > Runner > Info.plist

adding flutter permission for ios devices in info.plist

Copy paste the below permission in info.plist

<key>NSPhotoLibraryUsageDescription</key>
<string>This app requires read and write permission Photo Library</string>

used to ask uses to give permission for accessing photo library. This is Called Privacy – Photo Library Usage Description.

<key>NSCameraUsageDescription</key>
<string>This app requires read and write permission from the user.</string>

Used to take photo from device camera itself.

<key>NSMicrophoneUsageDescription</key>
<string>This app requires get access to micro phone</string>

if you intend to record an video by using camera, video offcourse need audio to be recorded, this permission is used to record audio from microphone.

Step4 : Explaination of Image Picker snippet code

File _image; //here we gonna store our image.
var image = await ImagePicker.pickImage(source: ImageSource.gallery);
image picking from gallery

Then, Here we are using ImagePicker Class to pick images from ImageSource.

var image = await ImagePicker.pickImage(source: ImageSource.camera);

Here, ImageSource can either be camera or gallery.

image capture in flutter app

Camera is you want to click a image from device camera.

Gallery is you want to pick/select image from gallery of mobile phone.

Picked image from gallery in flutter app

Complete Code for image picker in flutter

main.dart

import 'dart:ffi';
import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:image_picker/image_picker.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  File _image;

  Future getImagefromcamera() async {
    var image = await ImagePicker.pickImage(source: ImageSource.camera);

    setState(() {
      _image = image;
    });
  }

  Future getImagefromGallery() async {
    var image = await ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      _image = image;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Flutter Image Picker Example"),
      ),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: <Widget>[
          Center(
            child: Text(
              "Image Picker Example in Flutter",
              style: TextStyle(fontSize: 20),
            ),
          ),
          Padding(
            padding: const EdgeInsets.all(16.0),
            child: Container(
              width: MediaQuery.of(context).size.width,
              height: 200.0,
              child: Center(
                child: _image == null
                    ? Text("No Image is picked")
                    : Image.file(_image),
              ),
            ),
          ),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              FloatingActionButton(
                onPressed: getImagefromcamera,
                tooltip: "pickImage",
                child: Icon(Icons.add_a_photo),
              ),
              FloatingActionButton(
                onPressed: getImagefromGallery,
                tooltip: "Pick Image",
                child: Icon(Icons.camera_alt),
              )
            ],
          )
        ],
      ),
    );
  }
}

Here are some best Flutter Library that you can use in your flutter Project

Very useful Libraries in Flutter

Flutter image viewer : Is a simple photo View flutter library using which your app user will be easily able to zoom into the image.

Flutter time picker : A Flutter library that help you in adding date & time picker in your application.

Android Developer Image Libraries

Android Image Filter library : Image processing library is very easy to use as android image filter library.

Image Steps : Can you used as delivery progress indicator.

Flutter Image to base64 string or viceversa base64 to image: Here we have covered 3 example i.e convert image to base64 string, base64 to image, and pick image from gallery and convert it into base64 string.

Mobile Number OTP Verification / SMS OTP verification in Android

By
Rajat Palankar
-
0

Hi Guys, Welcome to Proto Coders Point, In this android tutorial we gonna integrate an app for OTP Verification in android.

For this, we gonna make use of the TextLocal SMS Service platform. I have already talked about TextLocal an India’s No 1 SMS service provider

Check out this Post Send SMS using text local an SMS GATEWAY – Android Studio Application

Let’s begin Integrating OTP Verification in our android application.

Mobile Number OTP Verification / SMS OTP verification in Android

Step 1: Creating a new account in textlocal.in or log in

go to textlocal.in create a new account or login with an old account if you have signup below with TextLocal.

After a Successful log In you will see a dashboard something like below

textlocal dashboard
textlocal dashboard

TextLocal provides you Free SMS Credit of 10, using which you can send up to 10 free SMS After you use all the Free SMS Credits you may need to  Buy their services for more SMS benefits. For App testing you can user textlocal otp generator.

Step 2: Creating a new API KEY in Text Local to send OTP

On your text local dashboard go to settings > API KEY.

Then Create a new API KEY

creating new api key in textlocal
creating new API key in textlocal

Note down the API key, because we then in our android application to send OTP to a mobile number via Text local.

Step 3: Creating a new Android Project

Now open  Android Studio as usual and create a new android application and name it as Android OTP Verification in android or anything your wish.

Step 4: Creating an OTP verification UI in android

 step1: create an XML file

under res > drawable > creating an XML file and name it as:

edittext_stroke_borders.xml

<shape xmlns:android="http://schemas.android.com/apk/res/android">

    <corners android:radius="10dp" />
    <stroke
        android:width="1dp"
        android:color="@color/colorPrimary" />
</shape>

this above XML code will create a transparent border that we can use to show in EditText view as the background.

border stroke xml android

Step2: login page UI design

main activity.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:gravity="center"
    android:orientation="vertical">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Welcome to Proto Coders Point"
        android:textColor="@android:color/black"
        android:textSize="20sp"
        android:layout_gravity="center"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="Android Tutorial on OTP VERIFICATION"
        android:textColor="@android:color/black"
        android:textSize="20sp"
        android:layout_gravity="center"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Login "
        android:textColor="@android:color/black"
        android:textSize="30sp"
        android:layout_gravity="center"/>

    <EditText
        android:id="@+id/userphoneno"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:ems="10"
        android:layout_margin="10dp"
        android:padding="5dp"
        android:background="@drawable/edittext_stoke_borders"
        android:inputType="number"
        android:hint="Enter Your  Phone"
        tools:layout_editor_absoluteX="118dp"
        tools:layout_editor_absoluteY="76dp" />
    <Button
        android:id="@+id/getotp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="@android:color/black"
        android:text="SignIN"
        android:layout_marginTop="10dp"
        android:layout_gravity="center"
        android:background="@color/colorAccent"/>


</LinearLayout>
otp verification ui android

Step 3: create a new activity

you need a new activity where we are going verify the OTP, for that you need to create an Activity with an XML file 

right-click on java > new > Activity > Empty Activity

Name it as OTP_Verification_Page

Then open the XML file of OTP Verification page and copy-paste below lines of XML UI code

activity_verify_otp.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Activity.GetOPT"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center">

    <Button
        android:id="@+id/get_otp_no"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="20dp"
        android:layout_marginTop="10dp"
        android:background="@color/colorPrimary"
        android:gravity="center"
        android:onClick="GetOTPNO"
        android:text="Get OTP Now"
        android:textColor="@android:color/white" />

    <EditText
        android:id="@+id/otpedittext"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:ems="10"
        android:layout_margin="10dp"
        android:padding="5dp"
        android:background="@drawable/edittext_stoke_borders"
        android:inputType="number"
        android:hint="......"
        android:letterSpacing="0.5"
        android:maxLength="6"
        android:gravity="center"
        tools:layout_editor_absoluteX="118dp"
        tools:layout_editor_absoluteY="76dp" />

    <Button
        android:id="@+id/verifyotp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_margin="20dp"
        android:layout_marginTop="10dp"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:onClick="verifyOTP"
        android:text="Verify"
        android:textColor="@android:color/black" />

</LinearLayout>
otp verification ui android

Step 4: create another Activity

like the same process as above create another Activity,

Here we gonna navigate the user if the OTP Verification mobile number was successful.

activity_successpage.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".SuccessLoginIn"
    android:gravity="center">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="25sp"
        android:textColor="@android:color/black"
        android:text="OTP VERIFIED SUCCESSFULLY"/>

</LinearLayout>

Now we are done with OTP Verification UI android, Now let’s add some backend code in MainActivity.java, VerifyOTP.java, SuccessLogin.java.

Step 5: Adding Backend Java code

MainActivity.java

package com.ui.otpverfication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    Button getotp;
    EditText userphoneno;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getotp=(Button)findViewById(R.id.getotp);
        userphoneno=(EditText)findViewById(R.id.userphoneno);

        getotp.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(userphoneno.getText().toString().trim().isEmpty())
                {
                    userphoneno.setError("Enter Phone No");
                }else{
                    Intent i = new Intent(MainActivity.this, VerifyOTP.class);
                    i.putExtra("phone",userphoneno.getText().toString().trim());
                    startActivity(i);
                    finish();
                }

            }
        });
    }
}

Here we are simply passing mobile number entered by users via intent to VerifyOTP.java page.

VerifyOTP.java

package com.ui.otpverfication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Random;

public class VerifyOTP extends AppCompatActivity {

    int randonnumber;
    String phonenumber;
    Button verifyotp,getVerifyotp;
    EditText otp_edittext;
    String otp_text;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_verify_otp);
        verifyotp=(Button)findViewById(R.id.verifyotp);
        getVerifyotp=(Button)findViewById(R.id.get_otp_no);
        otp_edittext=(EditText)findViewById(R.id.otpedittext);

        final StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);


        Intent intent=getIntent();
        phonenumber=intent.getStringExtra("phone");

        Toast.makeText(VerifyOTP.this, ""+phonenumber, Toast.LENGTH_SHORT).show();

    }

    void initialsendotp(){
        try {
            // Construct data
            String apiKey = "apikey=" + "ERJtdFbCOEk-5vvFn7mjg4SuywzHCcQkNxxxx(Replace with your API KEY)";

            Random random = new Random();
            randonnumber=random.nextInt(99999);
            String message = "&message=" + "Hey, Your OTP is " +randonnumber;
            String sender = "&sender=" + "TXTLCL";
            String numbers = "&numbers=" +phonenumber;

            // Send data
            HttpURLConnection conn = (HttpURLConnection) new URL("https://api.textlocal.in/send/?").openConnection();
            String data = apiKey + numbers + message + sender;
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Content-Length", Integer.toString(data.length()));
            conn.getOutputStream().write(data.getBytes("UTF-8"));
            final BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
            final StringBuffer stringBuffer = new StringBuffer();
            String line;
            while ((line = rd.readLine()) != null) {
                stringBuffer.append(line);
            }
            rd.close();
        } catch (Exception e) {
            System.out.println("Error SMS "+e);

        }
    }

    public  void GetOTPNO(View view)
    {
        initialsendotp();
        Toast.makeText(VerifyOTP.this,"OTP SENT< Please Wait you may recieved in a movement",Toast.LENGTH_LONG).show();
        getVerifyotp.setVisibility(View.GONE);
    }

    public void verifyOTP(View view) {
        Toast.makeText(VerifyOTP.this,"Verify Button",Toast.LENGTH_LONG).show();
        otp_text = otp_edittext.getText().toString().trim();

        if(otp_text.equals(String.valueOf(randonnumber)))
        {

            Toast.makeText(VerifyOTP.this,"user login in successfully",Toast.LENGTH_LONG).show();
            finish();
            Intent mainactivity = new Intent(VerifyOTP.this,SuccessLoginIn.class);

            startActivity(mainactivity);
        }
        else{
            Toast.makeText(VerifyOTP.this,"Invalid OTP, Please Try Again",Toast.LENGTH_LONG).show();

        }
    }
}

Here we have 2 buttons, one will send OTP to the registered mobile number and another button will simply verify the OTP entered by the user. and if the OTP entered by the user is correct the user will be navigated to the success page.

verify otp page

SuccessPage.java

package com.ui.otpverfication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

public class SuccessLoginIn extends AppCompatActivity {

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

here we are simply setting the content view with the layout XML file.

otp verification success page

After all, Don’t forget to set <user-permission> INTERNET under AndroidManifest.xml

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/> // need to make network calls

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