How to call new JSON AsynTask() in the Adapter's getView() on CheckBox click?

I know the JSON parsing. I have A List View and Grid View in same Activity. My List View has Check Box. So I am getting it's click in adapter class. So when I check that Check Box, then A new JSON will call and the data will set in the Grid View. But when I am trying to call the new JSON on setOnCheckedChangeListener(). then I am getting “System services not available to Activities before onCreate()” in onPostExecute().

Here is my code.

checkBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView,
                        boolean isChecked) {

                    ac = new PhoneAndTabletsActivity();
                     ac.new SendFilterInfo().execute();


                }
            });

In postExecute()

    @Override
    protected void onPostExecute(Void result) {
        super.onPostExecute(result);
        phoneTabletAdapter = new PhoneAndTabletAdapter1(
                PhoneAndTabletsActivity.this,
                R.layout.row_phone_and_tablet1, filterArray);
        gridView.setAdapter(phoneTabletAdapter);
    }