Facebook LoginButton 回调未被调用

Question

我正在尝试在我的 android 应用程序上实现一个简单的 Facebook 登录。当我单击登录按钮时，应用程序被重定向到 facebook 页面，输入凭据后，它再次返回到我的应用程序。但是不会调用 LoginButton 回调函数。虽然有几个类似的问题，但他们有一个单独的片段class。但是，我正在从主要 Activity 开始做所有事情。以下是我的代码：

package com.example.ankur.facebookdemo;

import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {
    private LoginButton loginButton;
    CallbackManager callbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();
        setContentView(R.layout.activity_main);

        loginButton = (LoginButton) findViewById(R.id.login_button);
        if (loginButton == null) {
            Log.v("CheckLogin", "null");
        }
        else {
            Log.v("CheckLogin", "not null");
        }


        loginButton.setReadPermissions("user_friends");

        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                // App code
                Toast.makeText(getApplicationContext(),"Fb Login Success", Toast.LENGTH_LONG);
                Log.v("CheckLogin", "successfully connected to facebook");
            }

            @Override
            public void onCancel() {
                // App code
                Toast.makeText(getApplicationContext(),"Fb on cancel",Toast.LENGTH_LONG);
                Log.v("CheckLogin", " connection to facebook cancelled");

            }

            @Override
            public void onError(FacebookException exception) {
                // App code
                Toast.makeText(getApplicationContext(),"Fb Login Error",Toast.LENGTH_LONG);
                Log.v("CheckLogin", "Error on  connection to facebook");
            }
        });

        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                        .setAction("Action", null).show();
            }
        });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

Answer 1

您忘记覆盖 onActivityResult() 方法。 onActivityResult() 导致回调方法被调用。

做这样的事情：

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

希望对您有所帮助！一切顺利:)

Answer 2

您缺少 onActivityResult 钩子：

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

The documentation明确指出：

Every activity and fragment that you integrate with the FacebookSDK Login or Share should forward onActivityResult to the callbackManager.

Facebook LoginButton 回调未被调用

Facebook LoginButton callback not getting called

android

facebook-login

facebook-android-sdk