如何使用适用于 android 的 google play 游戏服务实现后端服务器身份验证答案

【问题标题】：how to implement backend server authentication with google play games services for android如何使用适用于 android 的 google play 游戏服务实现后端服务器身份验证
【发布时间】：2016-08-19 21:06:55
【问题描述】：

也许我忽略了一些东西，但是通过 Play 游戏服务文档 https://developers.google.com/games/services/android/quickstart，我还不知道如何实现后端服务器身份验证，例如如何从 Google 的服务器获取令牌并将其传递给我自己的后端服务器验证登录。我希望有人能给我一个线索。谢谢！

【问题讨论】：

标签： android google-play google-play-games

【解决方案1】：

第 1 步：使用标准的谷歌登录按钮创建一个按钮

Step2 : 添加按钮点击监听器

第 3 步：在侦听器中检查 google play 服务的可用性

public void googleLoginClicked(View v){
        if (checkPlayServices()) {
            pickUserAccount();
        }else{
            showToast("Google Play Services is not installed or updated in your deivce", Toast.LENGTH_LONG);
        }
    }

受保护的布尔值 checkPlayServices() { 整数结果代码 =

GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (resultCode != ConnectionResult.SUCCESS) {
            if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
                GooglePlayServicesUtil.getErrorDialog(resultCode, this,
                        PLAY_SERVICES_RESOLUTION_REQUEST).show();
            } else {
             //   Log.i("GCM", "This device is not supported.");
                finish();
            }
            return false;
        }
        return true;
    }

第四步：

在手机中搜索谷歌账户：

private void pickUserAccount() {
        String[] accountTypes = new String[]{"com.google"};
        Intent intent = AccountPicker.newChooseAccountIntent(null, null,
                accountTypes, false, null, null, null, null);
        startActivityForResult(intent, REQUEST_CODE_PICK_ACCOUNT);
    }

第五步：

onActivityResult:

   @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == REQUEST_CODE_PICK_ACCOUNT) {
            if (resultCode == RESULT_OK) {
                mEmail = data.getStringExtra(AccountManager.KEY_ACCOUNT_NAME);
                getUsername(null);
            } else if (resultCode == RESULT_CANCELED) {
                showToast("You must pick an account",
                        Toast.LENGTH_SHORT);
            }

        } else if (requestCode == REQUEST_CODE_RECOVER_FROM_PLAY_SERVICES_ERROR && resultCode == RESULT_OK) {
            Bundle extra = data.getExtras();
            String oneTimeToken = extra.getString("authtoken");
            getUsername(oneTimeToken);

        }

    }

第6步：成功使用后台任务从谷歌获取用户名

异步任务：

doinbackground(){
...
fetchToken
...
}


 protected String fetchToken() throws IOException {
        try {
            return GoogleAuthUtil.getToken(mActivity, mEmail, mScope);
        } catch (UserRecoverableAuthException userRecoverableException) {
            // GooglePlayServices.apk is either old, disabled, or not present, which is
            // recoverable, so we need to show the user some UI through the activity.
            mActivity.handleException(userRecoverableException);
        } catch (GoogleAuthException fatalException) {
            onError("Unrecoverable error " + fatalException.getMessage(), fatalException);
        }
        return null;
    }

【讨论】：