代號一個FB認證

Question

我一直在使用下面的代碼

String clientId = "1171134366245722"; 
String redirectURI = "http://www.codenameone.com/"; 
String clientSecret = "XXXXXXXXXXXXXXXXXXXXXXXXXX"; 
Login fb = FacebookConnect.getInstance(); 
fb.setClientId(clientId); 
fb.setRedirectURI(redirectURI); 
fb.setClientSecret(clientSecret); 
//Sets a LoginCallback listener 
fb.setCallback(...); 
//trigger the login if not already logged in 
if(!fb.isUserLoggedIn()){ 
    fb.doLogin(); 
} else { 
    //get the token and now you can query the facebook 
    String token = fb.getAccessToken().getToken(); 
    ... 
} 

登錄到Facebook帳戶後，直接帶我到在代碼中指定和回調函數不工作的sendRedirectURI（XXX）。我需要運行setcallback()，我該如何實現這一目標？

Answer 1

對於Facebook登錄工作你有幾件事情要做。

您需要定義您想要獲取的數據類型。最好的方法是創建一個的UserData接口，並在你的類實現它：

public interface UserData { 

    public String getId(); 

    public String getEmail(); 

    public String getFirstName(); 

    public String getLastName(); 

    public String getImage(); 

    public void fetchData(String token, Runnable callback); 
} 

然後實現它是這樣的：

class FacebookData implements UserData { 

    String id; 
    String email; 
    String first_name; 
    String last_name; 
    String image; 

    @Override 
    public String getId() { 
     return id; 
    } 

    @Override 
    public String getEmail() { 
     return email; 
    } 

    @Override 
    public String getFirstName() { 
     return first_name; 
    } 

    @Override 
    public String getLastName() { 
     return last_name; 
    } 

    @Override 
    public String getImage() { 
     return image; 
    } 

    @Override 
    public void fetchData(String token, Runnable callback) { 
     ConnectionRequest req = new ConnectionRequest() { 
      @Override 
      protected void readResponse(InputStream input) throws IOException { 
       try { 
        JSONParser parser = new JSONParser(); 
        Map<String, Object> parsed = parser.parseJSON(new InputStreamReader(input, "UTF-8")); 
        id = (String) parsed.get("id"); 
        email = (String) parsed.get("email"); 
        first_name = (String) parsed.get("first_name"); 
        last_name = (String) parsed.get("last_name"); 
        image = (String) ((Map) ((Map) parsed.get("picture")).get("data")).get("url").toString(); 
       } catch (Exception ex) { 
       } 
      } 

      @Override 
      protected void postResponse() { 
       callback.run(); 
      } 

      @Override 
      protected void handleErrorResponseCode(int code, String message) { 
       if (code >= 400 && code <= 410) { 
        doLogin(FacebookConnect.getInstance(), FacebookData.this, true); 
        return; 
       } 
       super.handleErrorResponseCode(code, message); 
      } 
     }; 
     req.setPost(false); 
     req.setUrl("https://graph.facebook.com/v2.10/me"); 
     req.addArgumentNoEncoding("access_token", token); 
     req.addArgumentNoEncoding("fields", "id,email,first_name,last_name,picture.width(512).height(512)"); 
     NetworkManager.getInstance().addToQueue(req); 
    } 
} 

讓我們創建一個doLogin()方法，其中包括setCallback()

void doLogin(Login lg, UserData data, boolean forceLogin) { 
    if (!forceLogin) { 
     if (lg.isUserLoggedIn()) { 
      //process Facebook login with "data" here 
      return; 
     } 

     String token = Preferences.get("token", (String) null); 

     if (getToolbar() != null && token != null) { 
      long tokenExpires = Preferences.get("tokenExpires", (long) -1); 
      if (tokenExpires < 0 || tokenExpires > System.currentTimeMillis()) { 
       data.fetchData(token,() -> { 
        //process Facebook login with "data" here 
       }); 
       return; 
      } 
     } 
    } 

    lg.setCallback(new LoginCallback() { 
     @Override 
     public void loginFailed(String errorMessage) { 
      Dialog.show("Error Logging In", "There was an error logging in with Facebook: " + errorMessage, "Ok", null); 
     } 

     @Override 
     public void loginSuccessful() { 
      data.fetchData(lg.getAccessToken().getToken(),() -> { 
       Preferences.set("token", lg.getAccessToken().getToken()); 
       Preferences.set("tokenExpires", tokenExpirationInMillis(lg.getAccessToken())); 
       //process Facebook login with "data" here 
      }); 
     } 
    }); 
    lg.doLogin(); 
} 

long tokenExpirationInMillis(AccessToken token) { 
    String expires = token.getExpires(); 
    if (expires != null && expires.length() > 0) { 
     try { 
      long l = (long) (Float.parseFloat(expires) * 1000); 
      return System.currentTimeMillis() + l; 
     } catch (NumberFormatException ex) { 
     } 
    } 
    return -1; 
} 

最後，撥打doLogin()後fb.setClientSecret()

String clientId = "1171134366245722"; 
String redirectURI = "http://www.codenameone.com/"; 
String clientSecret = "XXXXXXXXXXXXXXXXXXXXXXXXXX"; 
Login fb = FacebookConnect.getInstance(); 
fb.setClientId(clientId); 
fb.setRedirectURI(redirectURI); 
fb.setClientSecret(clientSecret); 
doLogin(fb, new FacebookData(), false);