listView dynamic add item

Question

I used ListView to dynamic add item,but there is a problem about not Smooth add. there are textView and button in my listActivity,Iwant to Press button ,then

Answer 1

Yes!!, the method notifyDataSetChanged() applied in the ArrayAdapter before you fulling him, was the solution for me. Reading from Firebase.

Objects

    private DatabaseReference myRef;
    ArrayList lista;
    ArrayAdapter adapter;

OnCreate

    FirebaseDatabase database = FirebaseDatabase.getInstance();
    myRef = database.getReference("chat");

    //GETTIN MY DATA TO SHOW IN CHAT
    lista = new ArrayList();

OnResume

    myRef.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot postSnappy : dataSnapshot.getChildren()){
                for (DataSnapshot rePostSnappy : postSnappy.getChildren()){
                    // Defined Array values to show in ListView
                    lista.add(new String(rePostSnappy.getValue().toString()));
                    adapter.notifyDataSetChanged();//Notyfing adapter that will goes to change
                }
            }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

    adapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, lista);

    ListView listVista = (ListView) findViewById(R.id.list);
    listVista.setAdapter(adapter);