我应该使用什么而不是get.userId来获取facebook用户的用户名？

Question

import android.content.Intent;
import android.graphics.Typeface;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.MenuItem;
import android.widget.TextView;

import com.facebook.CallbackManager;
import com.facebook.FacebookSdk;
import com.facebook.login.LoginManager;
import com.facebook.login.widget.LoginButton;
import android.widget.Toast;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginResult;

public class MainActivity extends AppCompatActivity {

    private CallbackManager callbackManager;
    private LoginButton loginButton;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();
        setContentView(R.layout.login);
        Typeface myTypeface = Typeface.createFromAsset(getAssets(), "MAGNETOB.TTF");
        TextView myTextview = (TextView) findViewById(R.id.textview1);
        myTextview.setTypeface(myTypeface);

        loginButton = (LoginButton) findViewById(R.id.fb_login_button);
        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {


            @Override
            public void onSuccess(LoginResult loginResult) {

                System.out.println("Facebook Login Successful!");
                System.out.println("Logged in user Details : ");
                System.out.println("--------------------------");
                System.out.println("User ID  : " + loginResult.getAccessToken().getUserId());
                System.out.println("Authentication Token : " + loginResult.getAccessToken().getToken());
                Toast.makeText(MainActivity.this, "Login Successful!" + loginResult.getAccessToken().getUserId() , Toast.LENGTH_LONG).show();
                  *** // Over here where it says get.UserId()***

            }


            @Override
            public void onCancel() {
                Toast.makeText(MainActivity.this, "Login cancelled by user!", Toast.LENGTH_LONG).show();
                System.out.println("Facebook Login failed!!");



            }

            @Override
            public void onError(FacebookException e) {
                Toast.makeText(MainActivity.this, "Login unsuccessful!", Toast.LENGTH_LONG).show();
                System.out.println("Facebook Login failed!!");
            }
        });


    }

    @Override
    protected void onActivityResult(int reqCode, int resCode, Intent data) {
        callbackManager.onActivityResult(reqCode, resCode, data);
    }

在我的onSucess方法中，我想使用toast打印用户名，但似乎无法找到如何在没有textview的情况下这样做，这不是我想要的，我想使用toast加载用户名，但目前我正在加载userID。

请帮助谢谢

Answer 1

• 在onSuccess方法中尝试了这个：

      @Override 
  public void onSuccess(LoginResult loginResult) { 
  
    Profile profile = Profile.getCurrentProfile();
    if(profile != null) {    
     String fbid = profile.getId();
  
           String name = profile.getFirstName();
  
           String profileUrl = "https://graph.facebook.com/" + fbid
  
                                   + "/picture?type=large";
        }
  
  }
  

  -

其他方法是使用图形

    @Override
            public void onSuccess(final LoginResult loginResult) {
                accessToken = loginResult.getAccessToken();
                GraphRequest request = GraphRequest.newMeRequest(loginResult.getAccessToken(), new GraphRequest.GraphJSONObjectCallback() {
                    @Override
                    public void onCompleted(JSONObject json, GraphResponse response) {
                        if (response.getError() != null) {
                            //show error message to user
                        } else {
                            loginResult.getRecentlyGrantedPermissions();
                            Log.d("fb response", json.toString());
                            try {
                                //check json response
                            } catch (JSONException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                });
                Bundle parameters = new Bundle();
                parameters.putString("fields", "id,name,email,gender, birthday,location");
                request.setParameters(parameters);
                request.executeAsync();

            }

Answer 2

在onSuccess方法中，使用Graph API获取用户信息，请参阅official doc

@Override
public void onSuccess(LoginResult loginResult) {

     Bundle params = new Bundle();
     params.putString("fields", "id,name,first_name,last_name");//here you can add more fields as you want 
     new GraphRequest(loginResult.getAccessToken(), "me"/*you can also  pass FB id of user instead of 'me'*/, params, HttpMethod.GET,
     new GraphRequest.Callback() {
        @Override
        public void onCompleted(GraphResponse response) {
            if (response != null) {
                try {

                      JSONObject userObj = response.getJSONObject();
                      String fname =userObj.optString("first_name");
                      String lname =userObj.optString("last_name");
                      String fullName =userObj.optString("name");

                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
     }).executeAsync();
}