如何修复错误＆＃34;无法转换为android.content.Context＆＃34;

Question

我在片段中有功能

public void resetUpdating()
{
    MenuItem menuItem = Mymenu.findItem(R.id.action_refresh);
    if(menuItem.getActionView()!=null)
    {
        menuItem.getActionView().clearAnimation();
        menuItem.setActionView(null);
    }
}

在AsyncTask中调用并获取错误“无法转换的类型无法转换为android.content.Context”

protected void onPostExecute(ArrayList<String> strings) {
    super.onPostExecute(strings);
    ((Currency_list)mContext).resetUpdating();
}

片段

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.action_refresh:
           if (isOnline()) {
                LayoutInflater inflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                ImageView iv = (ImageView)inflater.inflate(R.layout.animated_view, null);
                Animation rotation = AnimationUtils.loadAnimation(getActivity(), R.anim.refresh_anim);
                rotation.setRepeatCount(Animation.INFINITE);
                iv.startAnimation(rotation);
                item.setActionView(iv);
                parseData = new ParseData(getActivity());
                try {
                    arrayList = parseData.execute().get();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                } catch (ExecutionException e) {
                    e.printStackTrace();
                }
                setCustomList();
            }
            break;

请告诉我我错在哪里？