android - 关于 Android 上的 Facebook 登录

Question

我注意到有些游戏使用 Facebook SDK 登录他们的游戏。我第一次登录时，它会显示一个登录表单并转到他们的应用程序。注销并再次登录后，它不再显示 Facebook 登录表单。如果我想用另一个 Facebook 帐户登录，我必须使用 Facebook 应用程序。为什么？为什么游戏的注销按钮也无法注销Facebook？这是一个正确的机制吗？

Answer 1

打开由 facebook sdk 提供的 Facebook.java，然后我进行了如下更改：

public void authorize(Activity activity, String[] permissions,
            int activityCode, final DialogListener listener) {

        boolean singleSignOnStarted = false;

        mAuthDialogListener = listener;

      /*  // Prefer single sign-on, where available.
        if (activityCode >= 0) {
            singleSignOnStarted = startSingleSignOn(activity, mAppId,
                    permissions, activityCode);
        }
        // Otherwise fall back to traditional dialog.
        if (!singleSignOnStarted) {*/
            startDialogAuth(activity, permissions);
       // }
    }

Answer 2

使用以下代码进行注销：

private void logout(Facebook facebook) {
    AsyncFacebookRunner mAsyncRunner = new AsyncFacebookRunner(facebook);
    mAsyncRunner.logout(getBaseContext(), new RequestListener() {
        @Override
        public void onComplete(String response, Object state) {
            Log.i("System out", "Logout:onComplete:res:state " + response
                    + ":" + state);
            new LoginData(SettingsActivity.this).clearFacebookDataInPref();
            handler.sendEmptyMessage(1);
        }

        @Override
        public void onIOException(IOException e, Object state) {
            Log.i("System out", "Logout:state" + ":" + state);
            e.printStackTrace();
            exceptionMessage = e.getMessage();
            handler.sendEmptyMessage(2);
        }

        @Override
        public void onFileNotFoundException(FileNotFoundException e,
                Object state) {
            Log.i("System out", "Logout:OnFileNotFoundExce:state:" + state);
            e.printStackTrace();
            exceptionMessage = e.getMessage();
            handler.sendEmptyMessage(2);
        }

        @Override
        public void onMalformedURLException(MalformedURLException e,
                Object state) {
            Log.i("System out", "Logout:MalformedURLExce:state:" + state);
            e.printStackTrace();
            exceptionMessage = e.getMessage();
            handler.sendEmptyMessage(2);
        }

        @Override
        public void onFacebookError(FacebookError e, Object state) {
            Log.i("System out", "Logout:onFacebookError:state" + state);
            e.printStackTrace();
            exceptionMessage = e.getMessage();
            handler.sendEmptyMessage(2);
        }
    });
}

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