Android App Firebase and Google Login Demo

Project Description

This android demo project shows step by step how to use app user authorization using by Firebase and Google APIs.  As enabling Firebase user authorization for the android app needs some detailed instructions,  I made step by step methods for later references.  Developers need to use Firebase Console and Google APIs Console for this demo project.  These are brief steps to achieve the goal.
  • 1. Create android app using Android Studio.
  • 2. Create (or open) a project from Firebase Console. And add (edit) the requirements.
  • 3. Create (or update) a project from Google APIs Console.
  • 4. Code app.
GitHub Source
Android App Screenshots
1. Create android app using Android Studio
Android app package name will be used on Firebase Console project.
2. Update build.gradle
  • App build.gradle update dependencies.
    compile 'com.google.firebase:firebase-auth:10.0.1'
    compile 'com.google.android.gms:play-services-auth:10.0.1'
    Add google service plugin at the bottom of the gradle file.
    apply plugin: 'com.google.gms.google-services'
  • Project build.gradle update dependencies.
    classpath 'com.google.gms:google-services:3.0.0'
3. Firebase Console Configuration
  • Create or select firebase project.
  • Prepare SHA1 certificate fingerprint.
    instruction here.
  • Add android app from project settings.
    Use android app package name when add the app.
  • Add SHA1 certification fingerprint generated previously.
  • Download google-services.json file and add into the android project.
    Add json file on to the app folder.
  • Enable Google authentication.
4. Google Developers Console Configuration
  • Open google developers console, and find a project.
    Firebase will generate a project on the developers console automatically.
  • Open Web client OAuth 2.0 client id
    Web client id will be used for requesting the Google SignIn apis on the android app.
    Check android package name and Signing-certificate fingerprint values
  • Open google-services.json file and check the fingerprint and package name values.
9. Finished.