Facebook 登录按钮未显示在 ActionbarActivity 中

Posted 2023-03-17

【中文标题】Facebook 登录按钮未显示在 ActionbarActivity 中

【英文标题】：Facebook login button not showing up in ActionbarActivity

【发布时间】：2015-01-02 22:55:57

【问题描述】：

我想将 Facebook 登录按钮添加到操作栏活动。我按照https://developers.facebook.com/docs/android/login-with-facebook/v2.2?locale=de_DE 的说明进行操作，如果我使用 FragmentActivity，一切正常。但是，如果我从 ActionBarActivity 扩展 LoginActivity，虽然我没有收到任何错误，但登录按钮只是没有显示在活动中。

这是我的activity_login.xml 代码：

<com.facebook.widget.LoginButton
    android:id="@+id/authButton"
    android:layout_
    android:layout_
    android:layout_gravity="center_horizontal"
    android:layout_marginTop="30dp"
    />

对于LoginActivity.java：

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class LoginActivity extends ActionBarActivity 

private MainFragment mainFragment;

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

    if (savedInstanceState == null) 
        // Add the fragment on initial activity setup
        mainFragment = new MainFragment();
        getSupportFragmentManager()
        .beginTransaction()
        .add(android.R.id.content, mainFragment)
        .commit();
     else 
        // Or set the fragment from restored state info
        mainFragment = (MainFragment) getSupportFragmentManager()
        .findFragmentById(android.R.id.content);
    


@Override
public boolean onCreateOptionsMenu(Menu menu) 
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.login, 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();
    if (id == R.id.action_settings) 
        return true;
    
    return super.onOptionsItemSelected(item);


 public void onPause() 
     super.onPause();
     overridePendingTransition(0, 0);
 

还有MainFragment.java:

import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.UiLifecycleHelper;
import com.facebook.widget.LoginButton;

import android.support.v4.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class MainFragment extends Fragment 

private static final String TAG = "MainFragment";
private UiLifecycleHelper uiHelper;

@Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    uiHelper = new UiLifecycleHelper(getActivity(), callback);
    uiHelper.onCreate(savedInstanceState);


@Override
public View onCreateView(LayoutInflater inflater, 
        ViewGroup container, 
        Bundle savedInstanceState) 
    View view = inflater.inflate(R.layout.activity_login, container, false);

    LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton);
    authButton.setFragment(this);

    return view;


private void onSessionStateChange(Session session, SessionState state, Exception exception) 
    if (state.isOpened()) 
        Log.i(TAG, "Logged in...");
     else if (state.isClosed()) 
        Log.i(TAG, "Logged out...");
    


private Session.StatusCallback callback = new Session.StatusCallback() 
    @Override
    public void call(Session session, SessionState state, Exception exception) 
        onSessionStateChange(session, state, exception);
    
;

@Override
public void onResume() 
    super.onResume();
    uiHelper.onResume();
    //Add Monitor Facebook logins for statistical reasons!!
    // For scenarios where the main activity is launched and user
    // session is not null, the session state change notification
    // may not be triggered. Trigger it if it's open/closed.
    Session session = Session.getActiveSession();
    if (session != null &&
           (session.isOpened() || session.isClosed()) ) 
        onSessionStateChange(session, session.getState(), null);
    

    uiHelper.onResume();


@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) 
    super.onActivityResult(requestCode, resultCode, data);
    uiHelper.onActivityResult(requestCode, resultCode, data);


@Override
public void onPause() 
    super.onPause();
    uiHelper.onPause();


@Override
public void onDestroy() 
    super.onDestroy();
    uiHelper.onDestroy();


@Override
public void onSaveInstanceState(Bundle outState) 
    super.onSaveInstanceState(outState);
    uiHelper.onSaveInstanceState(outState);

【问题讨论】：

所有安卓版本都会出现这个问题吗？如果你添加普通的Button而不是facebook登录按钮，它是否可见？

@AbhishekV 这似乎只发生在 Android 5.0 中。它在 Android 4.4 中运行良好。如果我实现一个普通的 android.widget.Button，我也看不到按钮。

检查这个：***.com/questions/26633743/…，code.google.com/p/android/issues/detail?id=78701。好像是同一个问题

像魅力一样工作。感谢您的帮助！

我很高兴它有帮助:)

【参考方案1】：

参考这些问题： Fragments won't show up in activity extending ActionBarActivity

https://code.google.com/p/android/issues/detail?id=78701

您可以在 post 方法中添加片段来解决此问题。

new Handler().post(new Runnable() 
    @Override
    public void run() 
        // Add the fragment on initial activity setup
    mainFragment = new MainFragment();
    getSupportFragmentManager()
    .beginTransaction()
    .add(android.R.id.content, mainFragment)
    .commit();
    
);

【参考方案2】：

在你的 LoginActivity 中实现必要的回调函数和 uiHelper 的东西。如果您使用 Facebook 软件包中的 LoginButton，只需将 Facebook 的 Login 活动添加到您的清单。

<application>
...
    activity
        android:name="com.facebook.LoginActivity"
        android:label="@string/app_name" />
    <meta-data
        android:name="com.facebook.sdk.ApplicationId"
        android:value="@string/app_id" />
</application>