ADD:- Initial Source Commit.

.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 0b8abb4724aa590dd0f429683339b1e045a1594d
+  channel: stable
+
+project_type: app

CHANGELOG

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+1.0.0 (July 17, 2020)
+Initial release - Sample source code for Flutter OTP Authentication demo.

README.md

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-# Flutter-OTP-Authentication
+# Flutter - OTP Authentication
+
+A Flutter based OTP Authentication component, used to verify your mobile number with OTP (One Time Password) using Firebase Authentication. 
+
+
+## Table of contents
+- [Flutter Support](#flutter-support)
+- [Demo](#demo)
+- [Features](#features)
+- [Getting started](#getting-started)
+- [Usage](#usage)
+- [Methods](#methods)
+- [Want to Contribute?](#want-to-contribute)
+- [Need Help / Support?](#need-help)
+- [Collection of Components](#collection-of-Components)
+- [Changelog](#changelog)
+- [License](#license)
+- [Keywords](#Keywords)
+
+
+## Flutter Support
+
+Version - Flutter 1.17 (stable)
+
+We have tested our program in above version, however you can use it in other versions as well.
+
+
+## Demo
+[![](wliotpauthentication.jpg)](https://github.com/weblineindia/Flutter-OTP-Authentication/blob/master/wliotpauthentication.jpg)
+
+------
+
+## Features
+
+* Select country with flag & country code. 
+* Verify mobile number with OTP all over the world.
+
+
+## Getting started
+
+* Download this sample project and import widget dart files in your Flutter App. 
+* Update Widgets UI based on your requirements. 
+
+
+## Usage
+
+Setup process is described below to integrate in sample project.
+
+### Methods
+
+Configure Country Picker Widget & implement method for call back selected country details e.g
+
+    // Put CountryPicker Widget
+    CountryPicker(
+        callBackFunction: _callBackFunction
+    );
+
+    // Create callback function 
+    void _callBackFunction(String name, String dialCode, String flag) {
+        // place your code
+    }
+
+Configure PINEntryTextField For OTP (One Time Password)
+
+    // add this package in pubspec.yaml file
+    pin_entry_text_field: ^0.1.4
+
+    // run this command to install package
+    flutter pub get
+
+    // add PINEntryTextField in class
+    PinEntryTextField(
+      fields: 6,
+      onSubmit: (text) {
+      },
+    )
+
+Validate Phone Number & Generate Otp     
+
+    // generate otp method and store Verification Id
+    Future<void> generateOtp(String contact) async {
+      final PhoneCodeSent smsOTPSent = (String verId, [int forceCodeResend]) {
+        verificationId = verId;
+      };
+      try {
+        await _auth.verifyPhoneNumber(
+            phoneNumber: contact,
+            codeAutoRetrievalTimeout: (String verId) {
+              verificationId = verId;
+            },
+            codeSent: smsOTPSent,
+            timeout: const Duration(seconds: 60),
+            verificationCompleted: (AuthCredential phoneAuthCredential) {},
+            verificationFailed: (AuthException exception) {
+             // Navigator.pop(context, exception.message);
+            });
+      } catch (e) {
+        Navigator.pop(context, (e as PlatformException).message);
+      }
+    }
+
+
+Verify otp                   
+
+    //Method for verify otp entered by user  
+    Future<void> verifyOtp() async {
+      if (smsOTP == null || smsOTP == '') {
+        showAlertDialog(context, 'please enter 6 digit otp');
+        return;
+      }
+      try {
+        final AuthCredential credential = PhoneAuthProvider.getCredential(
+          verificationId: verificationId,
+          smsCode: smsOTP,
+        );
+        final AuthResult user = await _auth.signInWithCredential(credential);
+        final FirebaseUser currentUser = await _auth.currentUser();
+        assert(user.user.uid == currentUser.uid);
+        Navigator.pushReplacementNamed(context, '/homeScreen');
+      } catch (e) {
+        handleError(e as PlatformException);
+      }
+    }
+
+
+Handle errors
+
+    //Method for handle the errors
+    void handleError(PlatformException error) {
+      switch (error.code) {
+        case 'ERROR_INVALID_VERIFICATION_CODE':
+          FocusScope.of(context).requestFocus(FocusNode());
+          setState(() {
+            errorMessage = 'Invalid Code';
+          });
+          showAlertDialog(context, 'Invalid Code');
+          break;
+        default:
+          showAlertDialog(context, error.message);
+          break;
+      }
+    }
+
+------
+
+## Directive options
+
+### Firebase project setup steps
+
+Create Project setup in firebase console using below URL [https://console.firebase.google.com/](https://console.firebase.google.com/) . Enable Phone Number sign-in for your Firebase project in console
+[https://firebase.google.com/docs/auth/ios/phone-auth](https://firebase.google.com/docs/auth/ios/phone-auth])
+
+Download GoogleService-Info.Plist file and add into iOS folder
+
+Download GoogleService.json file and add into Android folder
+
+### Firebase project setup steps
+
+Install following pub dev package
+
+firebase_auth: ^0.15.4
+
+------
+
+## Want to Contribute?
+
+- Created something awesome, made this code better, added some functionality, or whatever (this is the hardest part).
+- [Fork it](http://help.github.com/forking/).
+- Create new branch to contribute your changes.
+- Commit all your changes to your branch.
+- Submit a [pull request](http://help.github.com/pull-requests/).
+
+ ------
+
+## Collection of Components
+ We have built many other components and free resources for software development in various programming languages. Kindly click here to view our [Free Resources for Software Development.](https://www.weblineindia.com/software-development-resources.html)
+
+------
+
+## Changelog
+Detailed changes for each release are documented in [CHANGELOG](./CHANGELOG).
+
+## License
+[MIT](LICENSE)
+
+[mit]: https://github.com/weblineindia/Flutter-OTP-Authentication/blob/master/LICENSE
+
+## Keywords
+Flutter-OTP-Authentication, Firebase-OTP-Authentication, Firebase-Authentication, Firebase, Authentication, OTP-Authetication