Parse + Facebook 授权：已为 <facebook> 注册回调：com.parse.ParseFacebookUtils

Posted 2023-03-17

【中文标题】Parse + Facebook 授权：已为 <facebook> 注册回调：com.parse.ParseFacebookUtils

【英文标题】：Parse + Facebook authorization: Callback already registered for <facebook>: com.parse.ParseFacebookUtils

【发布时间】：2015-11-10 17:11:27

【问题描述】：

我需要通过 Parse 在我的应用程序中添加 Facebook 授权。我按照https://parse.com/docs/android/guide#users-facebook-users 上的说明进行操作。但是如果我运行应用程序，然后按返回按钮，然后再次运行它，我总是会收到此错误：

java.lang.RuntimeException: Unable to start activity ComponentInfo.AuthActivity: java.lang.IllegalStateException: Callback already registered for <facebook>: com.parse.ParseFacebookUtils$1@28d04f8f
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2693)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758)
    at android.app.ActivityThread.access$900(ActivityThread.java:177)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:145)
    at android.app.ActivityThread.main(ActivityThread.java:5942)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
 Caused by: java.lang.IllegalStateException: Callback already registered for <facebook>: com.parse.ParseFacebookUtils$1@28d04f8f
    at com.parse.ParseAuthenticationManager.register(ParseAuthenticationManager.java:35)
    at com.parse.ParseUser.registerAuthenticationCallback(ParseUser.java:1094)
    at com.parse.ParseFacebookUtils$ParseUserDelegateImpl.registerAuthenticationCallback(ParseFacebookUtils.java:562)
    at com.parse.ParseFacebookUtils.initialize(ParseFacebookUtils.java:109)
    at com.parse.ParseFacebookUtils.initialize(ParseFacebookUtils.java:92)
    at .AuthActivity.onCreate(AuthActivity.java:47)
    at android.app.Activity.performCreate(Activity.java:6289)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2646)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2758) 
    at android.app.ActivityThread.access$900(ActivityThread.java:177) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1448) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:145) 
    at android.app.ActivityThread.main(ActivityThread.java:5942) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at java.lang.reflect.Method.invoke(Method.java:372) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195) 

这就是我的 Activity 的样子：

public class AuthActivity extends AppCompatActivity 
    …

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

        ParseFacebookUtils.initialize(this); // crash here

        setupEvents();

        …
    

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

    private void setupEvents() 
        findViewById(R.id.fb_login).setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                loginViaFacebook();
            
        );
    

    private void loginViaFacebook() 
        ParseFacebookUtils.logInWithReadPermissionsInBackground(AuthActivity.this, null, new LogInCallback() 
            @Override
            public void done(ParseUser user, ParseException err) 
                …
            
        );
    

这里有什么问题？

【参考方案1】：

您应该将 ParseFacebookUtils 初始化为 Application 类，而不是 AppCompatActivity 类。

您可以创建一个 java 类并将其命名为 Configs，在 Manifest 中设置其名称：

    <application
        android:name=".Configs"
        ...

Configs 类如下所示：

public class Configs extends Application 
…

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

    ParseFacebookUtils.initialize(this); 

    …