public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        facebookLogin();
    }
public void facebookLogin()
    {
    	shareAppPreferences = new AppPreferences(getApplicationContext());
    	 facebook =  new Facebook("APP KEY");//((GlobalVars)getApplicationContext()).facebook;
    	 Log.d("MyTag","access key: "+ shareAppPreferences.getAccessKey());
         String access_token = shareAppPreferences.getAccessToken();
         Long expires = shareAppPreferences.getAccessExpires();
         Log.d("MyTag","token:" +access_token);
         if(access_token != null) {
             facebook.setAccessToken(access_token);
         }
         if(expires != 0) {
             facebook.setAccessExpires(expires);
         }
         /*
          * Only call authorize if the access_token has expired.
          */
         if(!facebook.isSessionValid()) {
        	 Log.d("MyTag","In Authorize");
        	  facebook.authorize(this, new String[] {"publish_stream", "email"}, Facebook.FORCE_DIALOG_AUTH, new DialogListener() {
                  public void onComplete(Bundle values) {

                      shareAppPreferences.saveAccessToken(facebook.getAccessToken());
                      Log.d("MyTag","face token: " +facebook.getAccessToken());
                      shareAppPreferences.saveAccessExpires(facebook.getAccessExpires());
                      completeLogin();
                  }

                  public void onFacebookError(FacebookError e) {
                    Toast.makeText(getBaseContext(), "onFacebookError", Toast.LENGTH_SHORT).show();
                }

                public void onError(DialogError e) {
                    Toast.makeText(getBaseContext(), "onError", Toast.LENGTH_SHORT).show();
                }
                public void onCancel() {

              }
              });
         }
         else{
        	 completeLogin();
         }

    }
    private void completeLogin()
    {
        shareLinkOnFB();

        Intent intent = new Intent(this,MainActivity.class);
        Log.d("MyTag", "starting activity");
        startActivity(intent);
    }
   public void shareLinkOnFB(){
    	Facebook mFacebook = ((GlobalVars)getApplicationContext()).facebook;
    	AsyncFacebookRunner mAsyncRunner;
    	mAsyncRunner = new AsyncFacebookRunner(mFacebook);
    	Bundle params = new Bundle();

    	params.putString("message", "Test");
    	params.putString("name", "ka");
    	params.putString("link", "http://www.facebook.com");
    	params.putString("description", "desc ...");

    	mAsyncRunner.request("me/feed", params, new WallPostRequestListener());

        Toast.makeText(Login.this, "Posting to your Wall...", Toast.LENGTH_SHORT).show();
    }
    public class WallPostRequestListener extends BaseRequestListener {

        public void onComplete(final String response, final Object state) {
            Log.d("Facebook-Example", "Got response: " + response);
            String message = "<empty>";
            try {
                JSONObject json = Util.parseJson(response);
                message = json.getString("message");
            } catch (JSONException e) {
                Log.w("Facebook-Example", "JSON Error in response");
            } catch (FacebookError e) {
                Log.w("Facebook-Example", "Facebook Error: " + e.getMessage());
            }
            final String text = "Your Wall Post: " + message;
        }
    }
    public abstract class BaseRequestListener implements RequestListener {

    	public void onFacebookError(FacebookError e, final Object state) {
    	    Log.e("Facebook", e.getMessage());
    	    e.printStackTrace();
    	}

    	public void onFileNotFoundException(FileNotFoundException e,
    	        final Object state) {
    	    Log.e("Facebook", e.getMessage());
    	    e.printStackTrace();
    	}

    	public void onIOException(IOException e, final Object state) {
    	    Log.e("Facebook", e.getMessage());
    	    e.printStackTrace();
    	}

    	public void onMalformedURLException(MalformedURLException e,
    	        final Object state) {
    	    Log.e("Facebook", e.getMessage());
    	    e.printStackTrace();
    	}
    }

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

        facebook.authorizeCallback(requestCode, resultCode, data);
    }