Android Apps Development Workshop Day 2 slides

Android Forelancing Workshop

Day 2 - 19th April, 2016

• Full Stack Android Developer

• Top Rated Freelancer on Upwork

• Founder SumatoDev.com (The Mobile Apps Development Agency)

• 5+ years of experience developing Android Apps

• Most recent app is Hash-Todo Task Management App developed with Firebase

Shajeel Afzal

@ShajeelAfzal ShajeelAfzal.com

SumatoDev.com

I will be covering

• Facebook Login with Facebook Android SDK

• Firebase Basics

• Authentication with Firebase

• Saving and showing data from Firebase

• In App Purchase Integration

Login with Facebook

How it Works?

• Facebook Android SDK provides easy way to Login

• Users can grant permissions to our app

• Permissions like user_friends, email, user_posts etc

Read more about Permissions at https://goo.gl/rnBVav

Getting Facebook App ID

https://developers.facebook.com/quickstarts/?platform=android

Login with Facebook<code>

AccessTracker

• Create instance in the BaseActivity

• Callback method “onCurrentAccessTokenChanged”

• if(currentAccessToken != null)

• User is Logged In

• else

• User Logged Out.

Integration with

Firebase Introduction• NoSQL (key-value) based database

• Provides easy authentication methods

• Easy to write security rules to control security

• Automatically handles integration with Facebook, Google, Twitter, GitHub, Custom Provider and even Anonymous Login.

• Comes with builtin offline support

• No need to write “AsyncTasks” to store and retrieve data

• No need to worry about server side (Almost)

Firebase Authentication• Create Account on firebase.com

• Create New Project

• Enable Facebook Provider for the project by giving Facebook “App ID” and Facebook “App Secret”

• Specify the “Session Length”

• Include the Firebase-Android-SDK

• Initialise the SDK and use “authWithOAuthToken” method by passing the Facebook access token

Firebase Authentication• public void onAuthenticated(AuthData authData) is

called if authentication is successful

• public void onAuthenticationError(FirebaseError firebaseError) is called if not

• authData contains all the information of the authenticated user like UID, profile picture url, user name etc.

• NOTE: Authentication does not mean that user is created on Firebase

https://www.firebase.com/docs/android/guide/user-auth.html

Save User on Firebase

• Let’s discuss how we will organise the data

• Let’s discuss how Hash-Todo app organises the data

• Create User model

• Extract all user information from the AuthData object (I have created helper method for that)

• Store the user object on Firebase

Firebase usersRef = mFirebaseRef.child(Constants.FIREBASE_LOCATION_USERS).child(authData.getUid()); usersRef.setValue(user, new Firebase.CompletionListener() { @Override public void onComplete(FirebaseError firebaseError, Firebase firebase) { if (firebaseError == null) { } else { DialogUtils.showOkDialog(BaseActivity.this, "Login Problem", "Sorry an error occurred while logging in."); } }});