Android端如何避免Google OAuth授权同意界面弹出？

Great question! Let's break down why apps like Pokemon GO, CityMapper, and Booking.com don't show the consent screen for Google Sign-In, while yours does, plus how to resolve this.

First, Let's Understand the Permission Scope Issue #

Your code uses GoogleSignInOptions.DEFAULT_SIGN_IN, which automatically includes the profile and openid scopes—even if you only call requestEmail(). That's why you can't remove those scopes from the Google Developer Console's consent screen: they're baked into the default sign-in flow for OpenID Connect (which Google Sign-In relies on).

The popular apps you mentioned might be using a more minimal sign-in configuration, or their users have already granted the necessary permissions (more on that below).

Why the Consent Screen Pops Up (and Why Other Apps Don't) #

The consent screen triggers in specific scenarios, even for basic scopes like email, profile, and openid:

• First-time authorization: If a user has never granted your app access to these scopes, the screen will always pop up. Those popular apps have millions of users who've already authorized them, so returning users don't see the screen.
• Changed permissions: If you add or modify scopes after a user has already authorized your app, they'll see the screen again to approve the new access.
• Revoked permissions: If a user manually revoked your app's access in their Google Account settings, the screen will reappear on their next login.

Steps to Stop the Consent Screen From Popping Up (For Returning Users) #

1. Use a Minimal Sign-In Configuration #

If you only need access to the user's email, try ditching DEFAULT_SIGN_IN and building a leaner GoogleSignInOptions instance. This reduces the scopes you're requesting (though openid may still be required for OpenID Connect):

GoogleSignInOptions gso = new GoogleSignInOptions.Builder()
    .requestEmail()
    .build();

Test this configuration—you might find it reduces the consent screen's visibility, especially for users who haven't authorized your app yet.

2. Leverage Existing User Authorizations #

Once a user grants your app access to the required scopes, Google will remember this authorization. On subsequent logins, the consent screen won't pop up automatically. This is exactly why those popular apps don't show the screen for returning users.

3. Complete Google OAuth App Verification #

While verification is primarily required for sensitive scopes, completing the verification process can help streamline the authorization flow for your app. Verified apps are often trusted more by both users and Google, which may reduce the frequency of consent screen prompts (especially for new users).

4. Double-Check Your Consent Screen Settings #

In the Google Developer Console, make sure your consent screen is properly configured with accurate app information, privacy policy links, and a clear explanation of why you need the requested scopes. A transparent consent screen is less likely to cause confusion, and Google may optimize the flow for verified, well-configured apps.

Final Note #

It's important to remember: you can't completely eliminate the consent screen for first-time users—Google requires this to ensure users understand what access they're granting. But by minimizing your scopes, leveraging existing authorizations, and verifying your app, you can ensure the screen only appears when absolutely necessary.

内容的提问来源于stack exchange，提问作者Yuri