How to update a ListView that use CursorAdapter when click a button in listview's row

I'm getting EditText's text when I click the "Save" button and this text is saved to Database and a cursor returns form Database then displayed in Listview. All saving and getting operations have no problem. When I click the save button, the list have been refreshed dynamically but When I click the "Delete" button in list row,altough the cursor updated the listview doesn't refresh itself.

I dont know what's wrong... Thanks a lot for helps...

MainActivity'S oncreate:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    DB = new DataBase(this,"CursorDatas",null,1);

    ContextWrapper.setContext(getApplicationContext());

    editText =(EditText) findViewById(R.id.edittext);
    btnSave = (Button)findViewById(R.id.btn_save);
    recordsList = (ListView)findViewById(R.id.list);


    cursor = DB.getRecords();


    listAdapter = new ListAdapter(this,cursor);


    recordsList.setAdapter(listAdapter);


    btnSave.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            String str = editText.getText().toString();

            DB.addRecord(str);

            cursor = DB.getRecords();

            listAdapter = new ListAdapter(getApplicationContext(),cursor);

            recordsList.setAdapter(listAdapter);


        }
    });


}

My ListAdapter class

public class ListAdapter extends CursorAdapter {

LayoutInflater inf;
ViewHolder vHolder;
DataBase DB;
Cursor cursor;
ListView lW;
ListeAdaptor listAdapter;
Context context;


public ListeAdaptor(Context context, Cursor c) {
    super(context, c);
    // TODO Auto-generated constructor stub

    inf = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View v = inf.inflate(R.layout.activity_main, null);
    lW = (ListView)v.findViewById(R.id.list);
    DB = new DataBase(context,"CursorDatas",null,1);
    this.context = context;

}

@Override
public void bindView(View arg0, Context arg1, Cursor arg2) {
    // TODO Auto-generated method stub


    vHolder = (ViewHolder)arg0.getTag();

    vHolder.tV.setText(arg2.getString(arg2.getColumnIndex("Name")));

    vHolder.btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {


            String name = vHolder.tV.getText().toString();

            DB.deleteRecords(isim);

            cursor = DB.getRecords();

            listAdapter = new ListAdapter(ContextWrapper.getContext(),cursor);
            cursor.requery();
            listAdapter.notifyDataSetChanged();
            lW.setAdapter(listAdapter);

        }
    });

}

@Override
public View newView(Context arg0, Cursor arg1, ViewGroup arg2) {
    // TODO Auto-generated method stub

    View v = inf.inflate(R.layout.list_item,null);

    ViewHolder viewHolder = new ViewHolder(v);

    v.setTag(viewHolder);



    return v;
}

}

List Item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<TextView 
    android:id="@+id/name"
    android:layout_width="100dp"
    android:layout_height="match_parent"
    />

<Button
    android:id="@+id/btn_delete"
    android:layout_width="80dp"
    android:layout_height="50dp"
    android:layout_toRightOf="@id/name"
    android:layout_toEndOf="@id/name"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:text="Delete"></Button>