前言

公司做海外产品的，集成的是 google 账号登录，账号信息、邮箱等这些不涉及隐私的按 google 的正常登录流程可以轻松实现 。但是一旦需要获取涉及隐私的信息就比较麻烦，文档也不是十分清晰，非常难找，很多坑。

google 账号登录

官方链接：https://developers.google.com/identity/sign-in/android/start
https://developers.google.com/identity/sign-in/android/sign-in
google 账号登录接入的坑：

• 申请的 client_id必须是 api console 后台 ：https://console.cloud.google.com/apis 与 google play 后台对应的应用关联起来。
• client_id 下的签名信息和报名信息必须和测试时的 apk 的签名信息和报名信息一致。
• 在 google play 下启动 google 的二次签名，则 api console 后台的签名信息是二次签名后的信息。打包测试时使用上传 到 Google play 后台的 apk 的签名证书即可。

google 登录的流程在这个文档写的比较清楚了：https://developers.google.com/identity/sign-in/android/sign-in，这里大致说一下，不贴代码了

构建需求请求的内容：

GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
  .requestEmail()
  .requestIdToken("your client_id")
  .build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

2.发起登录请求，跳转 google 登录页面。

Intent signInIntent = mGoogleSignInClient.getSignInIntent();
 startActivityForResult(signInIntent, RC_SIGN_IN);

获取 Google 登录返回

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

 // Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
 if (requestCode == RC_SIGN_IN) {
  // The Task returned from this call is always completed, no need to attach
  // a listener.
  Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
  handleSignInResult(task);
 }
}

获取 用户 id token,传到你自己的 服务端 做验证

private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
 try {
  GoogleSignInAccount account = completedTask.getResult(ApiException.class);
  // Signed in successfully, show authenticated UI. 
 } catch (ApiException e) {
  // The ApiException status code indicates the detailed failure reason.
  // Please refer to the GoogleSignInStatusCodes class reference for more information.
  Log.w(TAG, "signInResult:failed code=" + e.getStatusCode()); 
 }
}

切换账号

 /**
  * 重新获取账号列表
  */
 public void revokeAccess() {
  try {
   if (mGoogleSignInClient!=null && mActivity!=null){
    mGoogleSignInClient.revokeAccess().addOnCompleteListener(mActivity, new OnCompleteListener<Void>() {
     @Override
     public void onComplete(@NonNull Task<Void> task) {
      Log.d(TAG, "onComplete: ");
     }
    });
   }
  } catch (Exception e){
   e.printStackTrace();
  }
 }

获取公开资料和需要特别授权的信息（性别、生日等）

1、在构建请求是新增获取 的公共资料信息 及 需要获取的特殊信息

private static final String GENDER_SCOPE = "https://www.googleapis.com/auth/user.gender.read";
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
  .requestEmail()
  .requestIdToken("your client_id")
  .requestScopes(new Scope(GENDER_SCOPE));
  .build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

需要请求的信息可在如下链接查找：https://developers.google.com/people/api/rest/v1/people/get

2、检测是否有权限

 GoogleSignInAccount lastSignedInAccount = GoogleSignIn.getLastSignedInAccount(mActivity);
  Scope scope = new Scope(GENDER_SCOPE);
  if (Utils.isNeedRequest() && !GoogleSignIn.hasPermissions(lastSignedInAccount,scope)){
     SGLog.d(TAG+" need requst permission...");
   GoogleSignIn.requestPermissions(mActivity,RC_GET_TOKEN,lastSignedInAccount,scope);
  }

注意：这一步不需要也可以，有这一步会出现一个 “再确认” 的授权页面，没有也不影响获取的信息。
3、跳转登录页面 （同以上 google 账号登录）
4、获取登录信息 （同以上 Google账号登录）
5、开启线程获取 特殊信息

 getProfileAsyncTask = new GetProfileAsyncTask(mActivity, new GpProfileInfoCallback() {
   @Override
   public void onGetProfileInfo(Person person) {
    SGLog.d(TAG+" onGetProfileInfo... ");
    getProfileInfo(person);
   }
  });
  getProfileAsyncTask.execute(signInAccount);

异步任务

// Global instance of the HTTP transport
 private static final HttpTransport HTTP_TRANSPORT = AndroidHttp.newCompatibleTransport();

 // Global instance of the JSON factory
 private static final JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance();

 private static class GetProfileAsyncTask extends AsyncTask<GoogleSignInAccount, Void, Person> {

  // Retrieved from the sigin result of an authorized GoogleSignIn
  private WeakReference<Activity> mActivityRef;
  private GpProfileInfoCallback mProfileInfoCallback;

  public GetProfileAsyncTask(Activity activity,GpProfileInfoCallback callback) {
   mActivityRef = new WeakReference<>(activity);
   mProfileInfoCallback = callback;
  }

  @Override
  protected Person doInBackground(GoogleSignInAccount... params) {
   if (mActivityRef.get() == null){
    SGLog.d(TAG+" GetProfileAsyncTask doInBackground activity is null.");
    return null;
   }

   GoogleSignInAccount signInAccount = params[0];
   Context context = mActivityRef.get().getApplicationContext();
   GoogleAccountCredential credential = GoogleAccountCredential.usingOAuth2(
     context,
     Collections.singleton(GENDER_SCOPE));
   credential.setSelectedAccount(signInAccount.getAccount());
   SGLog.d(TAG+" get profile info start.");
   PeopleService service =
     new PeopleService.Builder(HTTP_TRANSPORT, JSON_FACTORY, credential)
     .setApplicationName(ApkUtils.getAppName(context)) // your app name
     .build();
   SGLog.d(TAG+" get profile info start.");
   // Get info. on user
   Person person =null;
   try {
    person = service
      .people()
      .get("people/me")
      .setPersonFields("genders")
      .execute();
    SGLog.d(TAG+" getPerson end.");
    // return the result
    if (mProfileInfoCallback!=null){
     mProfileInfoCallback.onGetProfileInfo(person);
    }
   } catch (Exception e) {
    SGLog.e(TAG+e.getMessage());
    if (mProfileInfoCallback!=null){
     mProfileInfoCallback.onGetProfileInfo(null);
    }
    e.printStackTrace();
   }
   return person;
  }

  @Override
  protected void onPostExecute(Person aVoid) {
   super.onPostExecute(aVoid);
  }
 }

获取性别信息

private void getProfileInfo(Person person){
  SGLog.d(TAG+" executeProfileInfo...");
  if (person == null){
   notifyResult(mLastUser,Utils.SUCCESS);
  }else {
   try {
    List<Gender> genders = person.getGenders();
    Gender gender = genders.get(0);
    String value = gender.getValue();
    SGLog.d(TAG+" genders:"+genders.size()+ " gender:"+value);
    mLastUser.setGender(value);
    notifyResult(mLastUser,Utils.SUCCESS);
   }catch (Exception e){
    SGLog.e(TAG+" getProfileInfo error.");
    notifyResult(null,SGErrorCode.LOGIN_FAILED);
    e.printStackTrace();
   }
  }
 }

参考文献：

https://developers.google.com/identity/sign-in/android/sign-in
https://developers.google.cn/android/guides/http-auth
https://developers.google.com/people/api/rest/?apix=true
https://github.com/googlesamples/google-services/tree/master/android/signin
https://developers.google.com/people/api/rest/v1/people/get

总结

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