Question

I am creating one application for student. I need to set the different message whenever
user open application.I don’t understand how to do this or which method use for this.
I search lot of articles but i didn’t found anything.
So please provide me some reference or code.

Answer 1

Save your messages in a persistent storage. In android, you could use SharedPreference http://developer.android.com/reference/android/content/SharedPreferences.html, or a Sqlite databse http://developer.android.com/reference/android/database/sqlite/package-summary.html depending on your specific need. Store the messages in either of them and read back a different message each time.
Store some msgs in a SharedPreference at some point in your Activity:

SharedPreferences pref =    getPreferences(Context.MODE_PRIVATE);
        Editor ed =pref.edit();
        ed.putString("0","msg0");
        ed.putString("1","msg1");
        ed.putString("2","msg2");
        ed.putString("3","msg3");
        ed.commit();

Then in onCreate(), retrieve a random sg and diplay to the user:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        SharedPreferences pref =    getPreferences(Context.MODE_PRIVATE);
        Random r = new Random();

        String msg = pref.getString(r.nextInt(4)+"", "none");
        Toast.makeText(this, msg, Toast.LENGTH_LONG ).show();
}