LoginHandler.java

/*
 * Copyright 2010 Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package at.madexperts.logmynight.facebook;

import org.json.JSONObject;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

import com.facebook.android.AsyncFacebookRunner;
import com.facebook.android.DialogError;
import com.facebook.android.Facebook;
import com.facebook.android.FacebookError;
import com.facebook.android.Facebook.DialogListener;

/**
 * A handler for the login page.
 * 
 * @author yariv
 */
public class LoginHandler extends Handler {

    // The permissions that the app should request from the user
    // when the user authorizes the app.
    private static String[] PERMISSIONS = 
        new String[] { "offline_access", "read_stream", "publish_stream" };

    /**
     * Render the Login page.
     */
    public void go() {
        final Activity activity = LoginHandler.this.getActivity();
        activity.runOnUiThread(new Runnable() {
            public void run() {
                // We need to temporarily remove the app's WebView
                // instance because Android apparently doesn't support
                // multiple WebView instances in the same app.
                dispatcher.hideWebView();
                final Facebook fb = new Facebook();
                fb.authorize(getActivity(), FacebookActivity.APPLICATION_ID, PERMISSIONS, 
                        new AppLoginListener(fb));
            }
        });
    }


	private class AppLoginListener implements DialogListener {

		private Facebook fb;

		public AppLoginListener(Facebook fb) {
			this.fb = fb;
		}

		public void onCancel() {
			Log.d("app", "login canceled");
		}

		public void onComplete(Bundle values) {
			/**
			 * We request the user's info so we can cache it locally and use it
			 * to render the new html snippets when the user updates her status
			 * or comments on a post.
			 */
			new AsyncFacebookRunner(fb).request("/me",
					new AsyncRequestListener() {
						public void onComplete(JSONObject obj) {
							// save the session data
							String uid = obj.optString("id");
							String name = obj.optString("name");
							new Session(fb, uid, name).save(getActivity());

							// render the Stream page in the UI thread
							getActivity().runOnUiThread(new Runnable() {
								public void run() {
									dispatcher.showWebView();
									dispatcher.runHandler("publish");
								}
							});
						}
					});
		}

		public void onError(DialogError e) {
			Log.d("app", "dialog error: " + e);
		}

		public void onFacebookError(FacebookError e) {
			Log.d("app", "facebook error: " + e);
		}
	}

}