我曾尝试添加一个Facebook登录按钮，但是无论如何，在按下它之后都会出现错误

Question

我正在开发一个应用程序，我首先要添加Facebook登录名。我已经按照developer.facebook.com的步骤进行了操作，但是没有用。问题是，每次我按“继续使用Facebook”按钮时，都会在Toast消息中生成错误。这是我的MainActivity.java：

package com.example.android.loginfacebookexemplu;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import com.facebook.AccessToken;
import com.facebook.AccessTokenTracker;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.GraphRequest;
import com.facebook.GraphResponse;
import com.facebook.appevents.AppEventsLogger;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;


import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import org.json.JSONException;
import org.json.JSONObject;

import java.util.Arrays;

import de.hdodenhof.circleimageview.CircleImageView;

public class MainActivity extends AppCompatActivity {
    private LoginButton loginButton;
    private CircleImageView circleImageView;
    private TextView txtName,txtEmail;
    private CallbackManager callbackManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        loginButton = findViewById(R.id.login_button);
        txtName = findViewById(R.id.profile_name);
        txtEmail = findViewById(R.id.profile_email);
        circleImageView = findViewById(R.id.profile_pic);

        callbackManager = CallbackManager.Factory.create();
        loginButton.setPermissions(Arrays.asList("email","public_profile"));
        checkLoginStatus();

        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult)
            {
                Toast.makeText(MainActivity.this,"Utilizator conectat",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onCancel() {
                Toast.makeText(MainActivity.this,"Conexiune anulata",Toast.LENGTH_LONG).show();
            }

            @Override
            public void onError(FacebookException error) {
                Toast.makeText(MainActivity.this,"A aparut o eroare la conectare, te rugam sa reincerci",Toast.LENGTH_LONG).show();
            }
        });
    }

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

    AccessTokenTracker tokenTracker = new AccessTokenTracker() {
        @Override
        protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken, AccessToken currentAccessToken)
        {
            if(currentAccessToken==null)
            {
                txtName.setText("");
                txtEmail.setText("");
                circleImageView.setImageResource(0);
                Toast.makeText(MainActivity.this,"Utilizator deconectat",Toast.LENGTH_LONG).show();
            }
            else
                loadUserProfile(currentAccessToken);
        }
    };

    private void loadUserProfile(AccessToken newAccessToken)
    {
        GraphRequest request = GraphRequest.newMeRequest(newAccessToken, new GraphRequest.GraphJSONObjectCallback() {
            @SuppressLint({"SetTextI18n", "CheckResult"})
            @Override
            public void onCompleted(JSONObject object, GraphResponse response)
            {
                try {
                    String first_name = object.getString("first_name");
                    String last_name = object.getString("last_name");
                    String email = object.getString("email");
                    String id = object.getString("id");
                    String image_url = "https://graph.facebook.com/"+id+ "/picture?type=normal";

                    txtEmail.setText(email);
                    txtName.setText(first_name +" "+last_name);
                    RequestOptions requestOptions = new RequestOptions();
                    requestOptions.dontAnimate();

                    Glide.with(MainActivity.this).load(image_url).into(circleImageView);


                } catch (JSONException e) {
                    e.printStackTrace();
                }

            }
        });

        Bundle parameters = new Bundle();
        parameters.putString("fields","first_name,last_name,email,id");
        request.setParameters(parameters);
        request.executeAsync();

    }

    private void checkLoginStatus()
    {
        if(AccessToken.getCurrentAccessToken()!=null)
        {
            loadUserProfile(AccessToken.getCurrentAccessToken());
        }
    }
}

清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android.loginfacebookexemplu">

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data android:name="com.facebook.sdk.ApplicationId"
            android:value="@string/facebook_app_id"/>

        <activity android:name="com.facebook.FacebookActivity"
            android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
            android:label="@string/app_name" />
        <activity
            android:name="com.facebook.CustomTabActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
                <data android:scheme="@string/fb_login_protocol_scheme" />
            </intent-filter>
        </activity>

    </application>


</manifest>

而且我还根据互联网的建议和元数据对build.gradle进行了更新，如facebook的页面所建议。预先感谢！

Answer 1

    LoginButton loginButton;
     CallbackManager callbackManager;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        loginButton = findViewById(R.id.login_button);


        boolean loggedOut = AccessToken.getCurrentAccessToken() == null;

        if (!loggedOut) {
            Picasso.with(this).load(Profile.getCurrentProfile().getProfilePictureUri(200, 200)).into(imageView);
            Log.d("TAG", "Username is: " + Profile.getCurrentProfile().getName());

            //Using Graph API
            getUserProfile(AccessToken.getCurrentAccessToken());
        }

        loginButton.setReadPermissions(Arrays.asList("email", "public_profile"));
        callbackManager = CallbackManager.Factory.create();

        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                // App code
                //loginResult.getAccessToken();
                //loginResult.getRecentlyDeniedPermissions()
                //loginResult.getRecentlyGrantedPermissions()
                boolean loggedIn = AccessToken.getCurrentAccessToken() == null;
                Log.d("API123", loggedIn + " ??");

            }

            @Override
            public void onCancel() {
                // App code
            }

            @Override
            public void onError(FacebookException exception) {
                // App code
            }
        });

    }

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

    private void getUserProfile(AccessToken currentAccessToken) {
        GraphRequest request = GraphRequest.newMeRequest(
                currentAccessToken, new GraphRequest.GraphJSONObjectCallback() {
                    @Override
                    public void onCompleted(JSONObject object, GraphResponse response) {
                        Log.d("TAG", object.toString());
                        try {
                            String first_name = object.getString("first_name");
                            String last_name = object.getString("last_name");
                            String email = object.getString("email");
                            String id = object.getString("id");
                            String image_url = "https://graph.facebook.com/" + id + "/picture?type=normal";




                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                });

        Bundle parameters = new Bundle();
        parameters.putString("fields", "first_name,last_name,email,id");
        request.setParameters(parameters);
        request.executeAsync();

    }
}

清单文件

<meta-data android:name="com.facebook.sdk.ApplicationId" 
        android:value="@string/facebook_app_id"/>

    <activity android:name="com.facebook.FacebookActivity"
        android:configChanges=
                "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
        android:label="@string/app_name" />
    <activity
        android:name="com.facebook.CustomTabActivity"
        android:exported="true">
        <intent-filter>
            <action android:name="android.intent.action.VIEW" />
            <category android:name="android.intent.category.DEFAULT" />
            <category android:name="android.intent.category.BROWSABLE" />
            <data android:scheme="@string/fb_login_protocol_scheme" />
        </intent-filter>
    </activity>

依赖项

 implementation 'com.facebook.android:facebook-login:[5,6)'

快乐编码：）