Skeleton for login into Facebook

FbLoginActivity

package com.sudosaints.android;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;

import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.model.GraphObject;
import com.facebook.model.GraphUser;

public class FbLoginActivity extends Activity {

  private static List<String> permissions;
	Session.StatusCallback statusCallback = new SessionStatusCallback();
	ProgressDialog dialog;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.opening_screen_layout);
		
		ImageView fbButton = (ImageView) findViewById(R.id.fbButton);
		
		/***** FB Permissions *****/
		
		permissions = new ArrayList<String>();
		permissions.add("email");
		
		/***** End FB Permissions *****/
		
		fbButton.setOnClickListener(new View.OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Check if there is any Active Session, otherwise Open New Session
				Session session = Session.getActiveSession();
				
				if(!session.isOpened()) {
					session.openForRead(new Session.OpenRequest(FbShareActivity.this).setCallback(statusCallback).setPermissions(permissions));
				} else {
					Session.openActiveSession(FbShareActivity.this, true, statusCallback);
				}
			}
		});
		
		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);
			session.addCallback(statusCallback);
			if(session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) {
				session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback).setPermissions(permissions));
			} 
		}
	}
	
	
	private class SessionStatusCallback implements Session.StatusCallback {

		@Override
		public void call(Session session, SessionState state, Exception exception) {
			//Check if Session is Opened or not
			processSessionStatus(session, state, exception);
		}
		
	}

	public void processSessionStatus(Session session, SessionState state, Exception exception) {
		
		if(session != null && session.isOpened()) {
			
			if(session.getPermissions().contains("email")) {
				//Show Progress Dialog 
				dialog = new ProgressDialog(FbShareActivity.this);
				dialog.setMessage("Loggin in..");
				dialog.show();
				Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {

					@Override
					public void onCompleted(GraphUser user, Response response) {
						

						if (dialog!=null && dialog.isShowing()) {
							dialog.dismiss();
						}
						if(user != null) {
							Map<String, Object> responseMap = new HashMap<String, Object>();
							GraphObject graphObject = response.getGraphObject();
							responseMap = graphObject.asMap();
							Log.i("FbLogin", "Response Map KeySet - " + responseMap.keySet());
							// TODO : Get Email responseMap.get("email"); 
							
							String fb_id = user.getId();
							String email = null;
							String name = (String) responseMap.get("name");
							if (responseMap.get("email")!=null) {
								email = responseMap.get("email").toString();
								//TODO Login successfull Start your next activity
								startActivity(new Intent(FbLoginActivity.this, HomeActivity.class));
							}
							else {
								//Clear all session info & ask user to login again
								Session session = Session.getActiveSession();
								if(session != null) {
									session.closeAndClearTokenInformation();
								}
							}
						}
					}
				});
			} else {
				session.requestNewReadPermissions(new Session.NewPermissionsRequest(FbShareActivity.this, permissions));
			}
		}
	}
		
	/********** Activity Methods **********/
	
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		super.onActivityResult(requestCode, resultCode, data);
		Log.d("FbLogin", "Result Code is - " + resultCode +"");
		Session.getActiveSession().onActivityResult(FbShareActivity.this, requestCode, resultCode, data);
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		// TODO Save current session
		super.onSaveInstanceState(outState);
		Session session = Session.getActiveSession();
		Session.saveSession(session, outState);
	}
	
	@Override
	protected void onStart() {
		// TODO Add status callback
		super.onStart();
		Session.getActiveSession().addCallback(statusCallback);
	}
	
	@Override
	protected void onStop() {
		// TODO Remove callback
		super.onStop();
		Session.getActiveSession().removeCallback(statusCallback);
	}
}

Glad it helped :)

Is this also usable on a fragment? or do I have to place the events on the fragmentActivity?

Hi, Sorry for so late.
Yes you have to place events on Fragment Activity.You can pass callback to your fragment for initiating facebook login.

How to add the application Id

How do i add the application id....I kindly need an urgent assistance. Tnx

You can add app id in manifest.

Thank you!

Hi,
I have implmented this code.
When I hit the facebook login button it is showing the login screen of facebook.
But when i close without login and try to hit the login button again it crashes saying "session: an attempt was made to open an already opened session."

hi you have to use FbShareActivity.this not should be FbLoginActivity ???

if(!session.isOpened()) {
session.openForRead(new Session.OpenRequest(FbShareActivity.this).setCallback(statusCallback).setPermissions(permissions));
} else {
Session.openActiveSession(FbShareActivity.this, true, statusCallback);
}

thanks a lot !!!

Hi , what is the FbShareActivity in this code.??

hey how to import the library there are alot of error in the code !!!!

which library i import????
please give me