Android parsefacebooktils流与登录和注销

Question

我已经实现了一个Parse &在我的Android应用程序中使用ParseFacebookUtils。

TL;博士

1. 在登录(并链接)Facebook后创建一个Parse用户(ParseFacebookUtils.logIn)
2. 已注销(parsefacebookkutils)。注销,ParseUser.logOut)
3. 再次登录Facebook创建一个新的Parse

长版本:登录流程工作- parsefacebooktils。logIn调用启动Facebook对话框，接受后创建一个新的Parse用户并将其链接到用户的Facebook帐户。

注销后出现问题(parsefacebookkutils)。logOut和ParseUser.logOut)，并尝试重新登录到相同的Parse用户。Facebook对话框显示简短，然后我得到重定向到应用程序(因为它已经授权的Facebook用户)，但它似乎是一个新的Parse用户正在创建，而不是找到前一个相关的Facebook用户。

问题:是否有一种方法来启用这样的流?我必须手动获得已经创建的用户吗?

我的MainActivity的代码，其中所有的登录逻辑驻留:

public class MainActivity extends Activity {
  private ProgressBar progressBar;
  private Button loginButton;
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    progressBar = (ProgressBar) findViewById(R.id.splash_loading_spinner);
    loginButton = (Button) findViewById(R.id.splash_facebook_login);
    loginButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View view) {
        onLoginButtonClicked();
      }
    });
    ParseAnalytics.trackAppOpened(getIntent());
    // Check if there is a currently logged in user
    // and they are linked to a Facebook account.
    ParseUser currentUser = ParseUser.getCurrentUser();
    if ((currentUser != null) && ParseFacebookUtils.isLinked(currentUser)) {
      // load data from Parse user and launch the next activity immediately
      retrieveData();
    } else {
      failedLoggingIn();
    }
  }
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    ParseFacebookUtils.getSession().onActivityResult(this, requestCode, resultCode, data);
  }
  // this method will link the current ParseUser to the used Facebook account if needed
  private boolean linkFacebookUser() {
    ParseUser user = ParseUser.getCurrentUser();
    // save fb_id and email to the parse user
    Request.newMeRequest(ParseFacebookUtils.getSession(), new Request.GraphUserCallback() {
      @Override
      public void onCompleted(GraphUser fbUser, Response response) {
        if (fbUser == null) {
          Log.e("Facebook Me Request", "Failed fetching user Facebook Graph object.");
        } else {
          Log.d("Facebook Me Request", "Received Facebook graph object for "+fbUser.getId()+"("+fbUser.getProperty("email").toString()+")");
          ParseUser.getCurrentUser().put("fb_id", fbUser.getId());
          ParseUser.getCurrentUser().setEmail(fbUser.getProperty("email").toString());
          ParseUser.getCurrentUser().setUsername(fbUser.getProperty("email").toString());
          ParseUser.getCurrentUser().setPassword(UUID.randomUUID().toString());
          ParseUser.getCurrentUser().signUpInBackground(new SignUpCallback() {
            @Override
            public void done(ParseException e) {
              if (e == null) {
                Log.d("Parse signup user", "Successfully saved a new Parse-Facebook user!");
                retrieveData();
              } else {
                Log.e("Parse signup user", "FAILED saving a new Parse-Facebook user. Error: " + e.getMessage());
                e.printStackTrace();
              }
            }
          });
        }
      }
    }).executeAsync();
    return true;
  }
  private void retrieveData() {
    // fetch data needed to show movie recommendations
    Log.d("Parse Facebook Login Info", "fb_id=" + ParseUser.getCurrentUser().get("fb_id"));
    startActivity(new Intent(this, BrowseMoviesActivity.class));
    finish();
  }
  private void failedLoggingIn() {
    ParseUser.logOut();
    progressBar.setVisibility(View.GONE);
    loginButton.setVisibility(View.VISIBLE);
  }
  private void onLoginButtonClicked() {
    Log.d("UI", "Clicked the Facebook login button");
    progressBar.setVisibility(View.VISIBLE);
    loginButton.setVisibility(View.GONE);
    List<String> permissions = Arrays.asList(
      "public_profile",
      "user_friends",
      "user_actions.video",
      ParseFacebookUtils.Permissions.User.EMAIL,
      ParseFacebookUtils.Permissions.User.ABOUT_ME,
      ParseFacebookUtils.Permissions.User.RELATIONSHIPS,
      ParseFacebookUtils.Permissions.User.BIRTHDAY,
      ParseFacebookUtils.Permissions.User.LOCATION
    );
    ParseFacebookUtils.logIn(permissions, this, new LogInCallback() {
      @Override
      public void done(ParseUser user, ParseException err) {
        MainActivity.this.progressBar.setVisibility(View.GONE);
        if (user == null) {
          Log.d("ParseFacebookLogin", "Uh oh. The user cancelled the Facebook login.");
          if (err != null) {
            Log.d("ParseFacebookLogin",  "Error: " + err.getLocalizedMessage());
          }
          failedLoggingIn();
        } else if (user.isNew()) {
          Log.d("ParseFacebookLogin", "User signed up and logged in through Facebook!");
          // we should probably use this scenario to set fb id to the Parse user
          linkFacebookUser();
        } else {
          Log.d("ParseFacebookLogin", "User logged in through Facebook!");
          if (user.get("fb_id") == null) {
            linkFacebookUser();
          } else {
            retrieveData();
          }
        }
      }
    });
  }
}

Answer 1

我也遇到了同样的问题。实际上这是parse sdk中的一个bug，问题在没有改变我的任何代码的情况下解决了，只是通过安装最新的parse android sdk(在撰写本文时为1.8.1)。