android - 从 Facebook 连接的 Android 应用程序注销

Question

所以我按照 Androidhive tutorial 中有关使用 Facebook 登录 Android 应用程序的说明进行操作(我知道，这里使用的大多数类都已弃用)并最终将其作为我的 MainActivity

package com.divingscores;
public class MainActivity extends Activity implements View.OnClickListener {

private static String APP_ID = "779458385402636";

Intent facebookLogoutIntent = new Intent(this, LogoutActivity.class);
private Button fbLoginButton;

private Facebook facebook;
@SuppressWarnings("deprecation")
private AsyncFacebookRunner mAsyncRunner;
String FILENAME = "AndroidSSO_data";
private SharedPreferences mPrefs;


@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    //facebook = new Facebook(APP_ID);
    //mAsyncRunner = new AsyncFacebookRunner(facebook);
    }

@SuppressWarnings("deprecation")
public void loginToFacebook() {

    mPrefs = getPreferences(MODE_PRIVATE);
    String access_token = mPrefs.getString("access_token", null);
    long expires = mPrefs.getLong("access_expires", 0);

    if (access_token != null) {
        facebook.setAccessToken(access_token);
    }

    if (expires != 0) {
        facebook.setAccessExpires(expires);
    }

    if (!facebook.isSessionValid()) {
        facebook.authorize(this,
                new String[] { "email", "publish_stream" },
                new DialogListener() {

                    @Override
                    public void onCancel() {
                        // Function to handle cancel event
                    }

                    @Override
                    public void onComplete(Bundle values) {
                        // Function to handle complete event
                        // Edit Preferences and update facebook acess_token
                        SharedPreferences.Editor editor = mPrefs.edit();
                        editor.putString("access_token",
                                facebook.getAccessToken());
                        editor.putLong("access_expires",
                                facebook.getAccessExpires());
                        editor.commit();

                                           }

                    @Override
                    public void onFacebookError(FacebookError e) {
                        // TODO Auto-generated method stub

                    }

                    @Override
                    public void onError(DialogError e) {
                        // TODO Auto-generated method stub

                    }



                });
}}

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

    facebook = new Facebook(APP_ID);
    mAsyncRunner = new AsyncFacebookRunner(facebook);
    fbLoginButton = (Button) findViewById(R.id.fbLoginButton);
    fbLoginButton.setOnClickListener(this);
    return true;
}

@Override
public void onClick(View v) {

  switch(v.getId()) {


  case R.id.fbLoginButton:
      loginToFacebook();
      break;
  }

}
}

一切正常，我可以登录应用程序。但问题是我保持登录状态，因为我没有指定应用程序应该做什么，模拟器没有启动。我想要能够在登录成功时启动 activity，但不确定我应该将代码放在哪里。

Answer 1

让我们从使用 session 对象在 Android 上连接 Facebook 开始。

Pre: Import the Facebook SDK to your project.

1. 首先在您要使用 Facebook 登录的 Activity 中创建一个方法 setupFacebookConnect()

   // Add the Session status variable to your activity
   private Session.StatusCallback statusCallback = new FBSessionStatus();
   
   /**
   *
   * @param Bundle
   *
   */
   public void setupFacebookConnect(Bundle savedInstanceState) {
       Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS);
   
       Session session = Session.getActiveSession();
       if (session == null) {
            if (savedInstanceState != null) {
                session = Session.restoreSession(this, null, statusCallback,
                   savedInstanceState);
            }
            if (session == null) {
                session = new Session(this);
            }
            Session.setActiveSession(session);
            if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
                session.openForRead(new Session.OpenRequest(this)
                   .setCallback(statusCallback));
            }
       }
   }
   

2. 实现 onStart、onStop、onSavedInstanceState 和 onActivityResult 方法，如下所示

   @Override
   public void onStart() {
       super.onStart();
       Session.getActiveSession().addCallback(statusCallback);
   }
   
   @Override
   public void onStop() {
       super.onStop();
       Session.getActiveSession().removeCallback(statusCallback);
   }
   
   @Override
   protected void onSaveInstanceState(Bundle outState) {
       super.onSaveInstanceState(outState);
       Session session = Session.getActiveSession();
       Session.saveSession(session, outState);
   }
   
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
       super.onActivityResult(requestCode, resultCode, data);
       Session.getActiveSession().onActivityResult(this, requestCode,
           resultCode, data);
   }
   

3. 在Activity中添加一个内部类来监听Session状态回调

   private class FBSessionStatus implements Session.StatusCallback {
   
       @Override
       public void call(Session session, SessionState state,
           Exception exception) {
   
       }
   }
   

4. 添加到您的 list

   <activity android:name="com.facebook.LoginActivity" >
   </activity>
   

   和访问互联网的权限

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

   和 Facebook 应用程序 ID

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

5. 现在创建一个方法connectFacebook()，您可以调用它来连接到 Facebook

   public void connectFacebook() {
   Session session = Session.getActiveSession();
       if (!session.isOpened() && !session.isClosed()) {
           session.openForRead(new Session.OpenRequest(this)
               .setCallback(statusCallback));
       } else {
           Session.openActiveSession(this, true, statusCallback);
       }
   }
   

6. 最后创建一个方法disConnectFacebook，当您想要断开连接并清除 session 时调用

   public void disConnectFacebook() {
   Session session = Session.getActiveSession();
       if (!session.isClosed()) {
           session.closeAndClearTokenInformation();
       }
   }
   

7. 现在，一切设置就绪，从 Activity 的 onCreate() 调用 setupFacebookConnect() 方法。您可以在您想要连接或断开连接的地方调用 connectFacebook() 和 disConnectFacebook()，例如按下按钮或在某个对话框中，您可以在任何地方调用。

Pheww !! that was long, I hope it works, I have tested the connect and disconnect.

你可以在这里看到完整的源代码https://gist.github.com/rachitrm/7978389或分支此存储库 https://github.com/rachitrm/rm-facebook-login