1. Creem clasa cu atributele cerute, facem constructor cu toate atributele,
si constructor fara atribute, getteri si setteri si toString, IMPORTANT
implements Serializable
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2. Creem activitatea de formular, un ArrayList de tipul activitatii,
field-urile care sunt trecuta in XML (EditText, Spinner, CalendarView plm),
* la CalendarView ne mai trebuie un rand cu Calendar c=Calendar.getInstance();
* un int editedPosition - pt editarea formularului

- in onCreate
-> Intent
-> Array List-ul de mai sus = (cast)i.getSerializableExtra("list");
-> field-uri cu findviewById
-> editedPosition=intent.getIntExtra("pos",-1);
daca pozitia e diferita de -1 -> array list-ul =
i.getSerializableExtra("editList");
etId.setText(String.valueOf(arraylist.get(editedPosition).getId());
etId.setEnabled(false);
calendarView.setOnDateChangeListener(new CalendarView.On....
c=new GregorianCalendar(year,month,dayOfMonth);

- in btnAdd
field-urile
conditiile cerute de problema pt fiecare field
if(field.getText().toString().isEmpty()) { toast sau plm ce vrei tu }
else { field=VariableType.valueOf(field.getText().toString(); }
creaza un nou obiect de tipul clasei de mai sus cu field-urile fiind astea
de aici
if(editedPosition!=-1) { arraylistobiect.set(editedPosition,obiect); }
else { arraylistobiect.add(obiect); }
intent legat de Main
intent.putExtra("list",arraylistobiect);
startActivity(intent);
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3. Creaza activitatea de tip listView si obiectul lv_item

- xml pt lista, schimbi din constraint layout in linear layout, adaugi listview
- obiect lv_item - iti pui ca TextView atributele pe care le vrei afisate
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4. Clasa adaptorului - extends BaseAdapter
- creezi array list si context
- constructor, getter setter,
- functiile de la BaseAdapter
getCount() - return lista.size();
getItem(position) -  return lista.get(position);
getItemId(position) - return lista.get(position).getID();
creem inauntru o clasa Handler cu TextView pt fiecare atribut si un
constructor cu parametru Handler(View view) -
fiecare atribut = view.findViewById(R.id.atribut);

functia getView(int position, View convertView, ViewGroup parent) {
creezi un obiect handler
verifici daca convertView e null - daca e null
convertView=LayoutInflater.from(context).inflate(R.layout.lv_item,parent,false);
obiectHandler=new ObiectHandler(convertView);
convertView.setTag(obiectHandler);
else - obiectHandler=(ObiectHandler)convertView.getTag();

creaza un obiect de tipul clasei creata la inceput
Obiect obiect=(Obiect)arraylist	.get(position);
obiectHandler.atribut1.setText(VariableType.valueOf(obiect.getId());
return convertView;
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5. Clasa ActivitateLista
creezi arrayList, ListView si adaptor

- in onCreate
Intent
arrayList=(cast)intent.getSerializableExtra("list");
adaptor=new Adaptor(arrayList,this);
listView=findViewById(R.id.dpList);
listView.setAdapter(adaptor);
listView.setOnItemClickListener(new AdapterView.OnItem....
onItemClick
Intent i = new Intent(ListActivity.this,AddForm.class);
i.putExtra("pos",position);
i.putExtra("editList",arrayList);
startActivity(i);
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6. Main Activity
creezi arrayList in plm iar

- in onCreate
Intent i=getIntent();
ArrayList<DataPackage> test=(cast)i.getSerializableExtra("list");
if(test!=null) {
arrayList=test;
Intent intent=new Intent(this,ListActivity.class);
intent.putExtra("list",arrayList);
startActivity(intent);

- butonul de Add
Intent intent = new Intent(this,AddActivity.class);
intent.putExtra("list",arrayList);
startActivity(intent);