Google Sign in API - 获取照片 Uri 为空

我使用 Google Sign in API 来请求用户个人资料，例如用户显示名称、头像照片。我有null值 GoogleSignInAccount.getPhotoUrl()，获取值 GoogleSignInAccount.getDisplayName()。

Gmail 帐户可以，但私人帐户不行。私人帐户链接到 Google Gmail，它可以看到我的 Gmail 帐户和 Google Play 商店应用程序、Google plus 中的图片。但为什么我使用 Google Sign In account API 得到 null 值。

   GoogleSignInOptions.Builder builder = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestEmail();

        builder.setAccountName(userAcc);

        GoogleSignInOptions gso = builder.build();

mGoogleApiClient = new GoogleApiClient.Builder(this)
            .enableAutoManage(this, 0, this)
            .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
            .build();

        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);


 private void handleSignInResult(final GoogleSignInResult result) {
        if (result.isSuccess()) {
        if (getBaseContext() == null) {
            return;
        }
        GoogleSignInAccount acct = result.getSignInAccount();

        final String email = acct.getEmail();
        final String displayName = acct.getDisplayName();
        final Uri uri = acct.getPhotoUrl();

        String sUri = null;
        if (uri != null) {
            sUri = uri.toString();
        }

        System.out.println("GoogleSignInAccount: getPhotoUrl: " + sUri);

Use https://www.googleapis.com/plus/v1/people/USER_ID?fields=image&key=AIzaSyBz2jGjZl0VGkllxYYKRHPuuAX_oMxdyVQ,返回包含头像的json