可能不是最好的方法但我必须要做的是

public String performTokenRefresh() {
    AuthState state = AuthUtils.readAuthState(context, key);
    AuthorizationService service = new AuthorizationService(context);
    state.performActionWithFreshTokens(service, new 
    AuthState.AuthStateAction() {
        @Override
        public void execute(@Nullable String accessToken, @Nullable String 
        idToken, @Nullable AuthorizationException ex) {
            updateAuthState(accessToken); // updates the authstate in Shared Preferences
        }
    });
    Thread.sleep(10000); // 10 seconds to work with slow connections
    return AuthUtils.readAuthState(context, key).getAccessToken();
}

字符串