Question

我开始在android studio上进行开发，我想创建一个可以从我的facebook帐户连接的简单应用程序。为此：我使用：-developers.facebook.com中的工具。 -Firebase的工具。

代码如下：

package com.fb_.fblogin.facebooklogin;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;

import java.lang.reflect.ReflectPermission;
import java.util.Arrays;

public class MainActivity extends AppCompatActivity {
    private FirebaseAuth mAuth;
    private CallbackManager mCallbackManager;
    private static final String TAG = "FACELOG";
    private Button mFacebookBtn;
    private Button mLogoutBtn;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        mAuth = FirebaseAuth.getInstance();

        // Initialize Facebook Login button
        mFacebookBtn = findViewById(R.id.button3);
        mLogoutBtn = (Button) findViewById(R.id.button4);
        mCallbackManager = CallbackManager.Factory.create();
        mFacebookBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("email", "public_profile"));
                LoginManager.getInstance().registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        Log.d(TAG, "facebook:onSuccess:" + loginResult);
                        handleFacebookAccessToken(loginResult.getAccessToken());
                    }

                    @Override
                    public void onCancel() {
                        Log.d(TAG, "facebook:onCancel");
                        // ...
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Log.d(TAG, "facebook:onError", error);
                        // ...
                    }

                });
            }
        });

        mLogoutBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mAuth.signOut();
                LoginManager.getInstance().logOut();
            }
        });
        }

// ...


    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        if(currentUser != null)
        {
            updateUI();
        }

        //updateUI(currentUser);
    }

    private  void updateUI(){
        Toast.makeText(MainActivity.this, "You're logged in ",Toast.LENGTH_LONG).show();

        Intent accountIntent = new Intent(MainActivity.this, AccountActivity.class);
        startActivity(accountIntent);
        finish();
    }


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

        // Pass the activity result back to the Facebook SDK
        mCallbackManager.onActivityResult(requestCode, resultCode, data);
    }

    private void handleFacebookAccessToken(AccessToken token) {
        Log.d(TAG, "handleFacebookAccessToken:" + token);

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            updateUI();
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(MainActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }

                        // ...
                    }
                });
    }
}

好多代码... 这里的问题在 if（task.isSuccessful（））中，它总是在 handleFacebookAccessToken 函数中返回FALSE。我还注意到，在 handleFacebookAccessToken 函数的 token 变量中，它包含 {AccessToken令牌：ACCESS_TOKEN_REMOVED权限：[public_profile，电子邮件]} 可能有问题吗？如果是，我该怎么办才能解决此问题。

最诚挚的问候，

通过应用程序通过Facebook发布连接

0 个答案: