### oefening 4 ###

switch(view.getId()) {

    ...

    case R.id.tonen:

        Cursor c = gebruikersDB.rawQuery("SELECT * FROM gegevens",null);

        if (c.getCount()==0) {
            Log.d("database ", " is leeg");
        } else {
            while (c.moveToNext()){
                int Column1 = c.getColumnIndex("Inlognaam");
                int Column2 = c.getColumnIndex("Wachtwoord");

                String Name = c.getString(Column1);
                String WW = c.getString(Column2);
                Log.d(Name,WW);
            }
        }

        break;

    ...
}