RSA demo / example

This is the implementation of RSA tutorial given at http://www.javamex.com/tutorials/cryptography/rsa_encryption.shtml with little bit of additions so you can use it right out of the box.

CLASS:  RSAKeyGenerator

Method: void generateKeyPair("<public key file name>","<private key file name>")

CLASS: RSAEncDec

Method: String encrypt("your plane string message", "<location of public key file>")

              [Returns the base64 encoded string that you can send easily]

Method: String decrtpt("<above base64 encoded string>", "<location of private key file>")

              [Returns original plane string message]

For details see "readme.txt" and main() methods avaliable in each class

Download project at : https://github.com/meamit/rsa-demo

Showing notificaiton, passing parameter from Intent to activity

//my activity is under com.hello

//my activity class name is HelloAndroidActivity

In your IntentService class or Service class do following:

private void showNotification() {

        String ns = Context.NOTIFICATION_SERVICE;

        NotificationManager mNotificationManager = (NotificationManager) getSystemService(ns);

        int icon = R.drawable.icon;

        CharSequence tickerText = "some ticket text";

        long when = System.currentTimeMillis();

        Notification notification = new Notification(icon, tickerText, when);

       

        Context context = getApplicationContext();

        CharSequence contentTitle = "Some title";

        CharSequence contentText = "Some content";

        Intent notificationIntent = new Intent(this, HelloAndroidActivity.class);

       

        notificationIntent.setAction("com.hello"+System.currentTimeMillis());//notice : com.hello

   

        notificationIntent.putExtra("extra0", "some xtra message");

        notificationIntent.putExtra("extra1", "extra message");

       

       

        notificationIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP|Intent.FLAG_ACTIVITY_SINGLE_TOP);

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_UPDATE_CURRENT | Notification.FLAG_AUTO_CANCEL);

        notification.flags |= Notification.FLAG_AUTO_CANCEL;

        notification.setLatestEventInfo(context, contentTitle, contentText, contentIntent);

        mNotificationManager.notify(1, notification);//where 1 is the id,, different id will have different notification

   

    }

   
   
    in your activity class override onNewIntent method as shown below for example

   

    public void onNewIntent(Intent intent) {

        super.onNewIntent(intent);

        Bundle extras = intent.getExtras();

        String extra0 = extras.getString("extra0");

        String extra1 = extras.getString("extra1");

    }

acess internet from android simulator connected to sim card in card reader

When sim card is present normally emulator [here i am referring to 2.3.3 version] will try to connect internet via sim card so internet do not work. One trick is to do following:
When the emulator starts, do following:
 menu->Setting->Wireless-> enable airplane mode
After this disable airplane mode.

[make sure that adb emulator is allowed in firewall]

Triple Graph Grammar

They are the techniques for defining the correspondence between source and target model in a declarative way [declarative: specifying what instead of how]. In TGG we can do bi-directional transformation namely Forward Transformation and Backward Transformation. However there is no distinct differentiation on that due to bidirectional nature of TGG. TGG also can be used for model synchronization. 3 parts of TGG are
source model  <------ trace/correspondence model -----> Target model
[note in the similarity with QVT]