// u onCreate 

DBAdapter db = new DBAdapter(this);

        
        //---add a contact---
        db.open();
        long id = db.insertContact("Wei-Meng Lee", "weimenglee@learn2develop.net");
        id = db.insertContact("Mary Jackson", "mary@jackson.com");
        db.close();
        
        
        
        //--get all contacts---
        db.open();
        Cursor c = db.getAllContacts();
        if (c.moveToFirst())
        {
            do {
                DisplayContact(c);
            } while (c.moveToNext());
        }
        db.close();
        
        
        
        //---get a contact---
        db.open();
        Cursor cu = db.getContact(2);
        if (cu.moveToFirst())        
            DisplayContact(cu);
        else
            Toast.makeText(this, "No contact found", Toast.LENGTH_LONG).show();
        db.close();     
        
        
        
        //---update contact---
        db.open();
        if (db.updateContact(1, "Wei-Meng Lee", "weimenglee@gmail.com"))
            Toast.makeText(this, "Update successful.", Toast.LENGTH_LONG).show();
        else
            Toast.makeText(this, "Update failed.", Toast.LENGTH_LONG).show();
        db.close();
        
        
        
        //---delete a contact---
        db.open();
        if (db.deleteContact(1))
            Toast.makeText(this, "Delete successful.", Toast.LENGTH_LONG).show();
        else
            Toast.makeText(this, "Delete failed.", Toast.LENGTH_LONG).show();
        db.close();


// nakon onCreate        

//funkcija za ispis
  public void DisplayContact(Cursor c)
    {
        Toast.makeText(this,
                "id: " + c.getString(0) + "\n" +
                "Name: " + c.getString(1) + "\n" +
                "Email:  " + c.getString(2),
                Toast.LENGTH_LONG).show();
    }