samtstern / google-server-auth-android

Demonstrate Google Sign-In with Server Authorization on Android

google-server-auth-android

Overview

This sample application demonstrates the following features:

• Google Sign-In
• Retrieving server auth code for offline access

Prerequisites

To run this sample you will need the following:

• An Android device running Android 2.3 or higher that has the Google Play Store
• Android Studio
• The Google Play Services SDK (install in Android Studio via Tools > Android > SDK Manager)

Set Up

In order to use Google Sign-In in your application, you will need to register your application in the Google Developers Console.

1. Go to the Google Developers Console.
2. Click Create Project. Then enter a Project name and click Create.
3. In the left sidebar, click APIs & auth. Find and enable the Google+ API.
4. In the left sidebar, select Consent Screen. Fill out all required fields and click Save.
5. In the left sidebar, select Credentials:
   1. Click Create a new Client ID:
   2. Select Installed Application and then select Android.
   3. Enter com.google.android.gms.identity.quickstart as your package name.
   4. Enter the SHA1 of your debug keystore file. If you don't know how to get that, execute the keytool command on this page.
   5. Click Create Client ID.

Run

Now that you have created a Client ID, you are ready to run the sample app. Import the app into Android Studio and run it on your Android device,

Offline Access

This app demonstrates how to get a an ID token and server auth code during sign-in, but you will notice that some values are not filled in. If you would like to test the sample with your own webserver, create a Client ID for your server in the same project as the Android Client ID. Then, change the following values:

• MainActivity.java:
  • Change WEB_CLIENT_ID to the Client ID of your web server.
• ServerAuthHandler.java:
  • Change SERVER_BASE_URL to the base URL of your web server (like "https://example.com")
  • Change EXCHANGE_TOKEN_URL to the path on your web server where the Android application should send the server auth code and id token.
  • Change SELECT_SCOPES_URL to the path on your server where the Android client can get the list of scopes required by your server for offline access.