Start Integrating Google Sign-In into Your Android App

Before you can start integrating Google Sign-In in your own app, you must configure a Google API Console project and set up your Android Studio project. The steps on this page do just that. The next steps then describe how to integrate Google Sign-In into your app.

Prerequisites

Google Sign-In for Android has the following requirements:

• A compatible Android-powered device that runs Android 6.0 or newer and includes the Google Play Store or an emulator with an AVD that runs the Google APIs platform based on Android 4.2.2 or newer and has Google Play services version 15.0.0 or newer.
• The latest version of the Android SDK, including the SDK Tools component. The SDK is available from the Android SDK Manager in Android Studio.
• A project configured to compile against Android 6.0 (Marshmallow) or newer.

This guide is written for users of Android Studio, which is the recommended development environment.

Add Google Play services

In your project's top-level build.gradle file, ensure that Google's Maven repository is included:

allprojects {
    repositories {
        google()

        // If you're using a version of Gradle lower than 4.1, you must instead use:
        // maven {
        //     url 'https://maven.google.com'
        // }
    }
}

Then, in your app-level build.gradle file, declare Google Play services as a dependency:

apply plugin: 'com.android.application'
    ...

    dependencies {
        implementation 'com.google.android.gms:play-services-auth:21.3.0'
    }

Configure a Google API Console project

1. Open your project in the API console, or create a project if you don't already have one.
2. On the OAuth consent screen page, make sure all of the information is complete and accurate.
3. On the Credentials page, create an Android type client ID for your app if you don't already have one. You will need to specify your app's package name and SHA-1 certificate fingerprint. See Authenticating Your Client for more information.

Get your backend server's OAuth 2.0 client ID

If your app authenticates with a backend server or accesses Google APIs from your backend server, you need to get the OAuth 2.0 client ID that represents your backend server.

To create a client ID for your server:

1. Open your project in the API console.

2. On the Credentials page, create a Web application type client ID. Take note of the client ID string, which you will need to pass to the requestIdToken or requestServerAuthCode method when you create the GoogleSignInOptions object.

Next steps

Now that you have configured a Google API Console project and set up your Android Studio project, you can integrate Google Sign-In into your app.