Created an android app using web technologies like html, css, javascript. This is the simple representation of how Oauth technology works. Here representing how facebook_Oauth works. We have created an android app for this. Oauth is when you sign in to third party app/website using facebook/twitter/google etc.

1. facebook

2. Overview
•Node.JS
•Ionic Framework
•Apache Cordova
•Oauth
•Functioning
•Reference

3. Node.js is an open-source, cross-platform runtime environment
for developing server-side web applications.
Node.js applications are written in JavaScript and can be run
within the Node.js runtime on a wide variety of platforms,
including OS X, Microsoft Windows, Linux.
Its work is hosted and supported by the Node.js Foundation,a
collaborative project at the Linux Foundation.
Node.js contains a built-in library to allow
applications to act as a stand-alone web server.

4. Ionic is a powerful HTML5 SDK that helps you build native-
feeling mobile apps using web technologies like HTML, CSS,
and Javascript.
Ionic is focused mainly on the look and feel, and UI interaction
of your app.
Ionic provides all the functionality that can be found in native
mobile development SDKs. Users can build their apps,
customize them for Android or iOS, and deploy through
Cordova.

7. Apache Cordova is an open-source mobile development framework. It
allows you to use standard web technologies such as HTML5, CSS3, and
JavaScript for cross-platform development, avoiding each mobile platforms'
native development language. Applications execute within wrappers
targeted to each platform, and rely on standards-compliant API bindings to
access each device's sensors, data, and network status.
Use Apache Cordova if you are:
a mobile developer and want to extend an application across more than
one platform, without having to re-implement it with each platform's
language and tool set.
a web developer and want to deploy a web app that's packaged for
distribution in various app store portals.

8. Oauth
OAuth is an open standard for authorization, commonly used as
a way for Internet users to log into third party websites using their
Microsoft, Google, Facebook or Twitter accounts without
exposing their password
OAuth provides to clients a 'secure delegated access' to server
resources on behalf of a resource owner. It specifies a process
for resource owners to authorize third-party access to their server
resources without sharing their credentials.

9. How Oauth Works?

13. OpenID VS Oauth
OpenID is a standard protocol for authentication which also uses HTTP just
like OAuth. However, the purpose of OpenID is different from that of OAuth.
The main purpose of OpenID is authentication, while for OAuth it is
authorization. Therefore, using OpenID is fundamentally identical to log-in.
For OpenID, the OpenID Provider processes the user authentication
process. Many parties who rely on Open ID delegate the authentication to
the OpenID Provider.
In addition to authorization, OAuth also has its authentication process. For
example, when Facebook OAuth is used, Facebook Service Provider
authenticates the Facebook user. However, the essential purpose of OAuth
is to identify whether the user has the right to call the API to write on the
user's wall or the API to get the friends list.
You can use OAuth for user authentication; however, note that its
fundamental purpose is to authorize users. This is different from what
OpenID aims to achieve.

14. Reference
Google.com
Github.com
ionicframework.com
cordova.apache.org
wikipedia.org

15. Thank You !