Viewpager不要破坏/保存被破坏的页面

Question

我有viewpager和asynctask在一起。我没有问题地展示内容。

但;当我向页面添加单选按钮时（对于多项选择题），在我在内容之间滑动之后，以前选中的选项将取消选中。我想保存这个选中的选项

PagerAdapter：

public class QuestionPagerAdapter extends PagerAdapter{

    public QuestionPagerAdapter(){
        super();

    }
    @Override
    public int getCount() {
        int qcount = QuestionPagerAdapter.q.getQuestionCount();
        return qcount;
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == ((View) object);
    }

    @Override
    public Object instantiateItem(View collection, int pos) {
        LayoutInflater inflater = (LayoutInflater) collection.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        //View v = null;
        Context mycontext = collection.getContext();
        View page = inflater.inflate(R.layout.page_quiz, null);
        TextView tv = (TextView)page.findViewById(R.id.questionText);

            FetchTask fft = new FetchTask(tv);
        fft.execute(pos);

        ((ViewPager) collection).addView(page, 0);
        return page;
    }

    @Override
    public void destroyItem(View collection, int position, Object view) {
        //Util.Log("destroying" + position);
        ((ViewPager) collection).removeView((View) view);
    }

}

AsyncTask：

public  class FetchTask extends AsyncTask<Integer, Void, ArrayList<String>>  {

        TextView outTxt;

        public FetchTask(TextView outputTxt, LinearLayout linlay, RadioGroup mrg, Context dcontext) {

                outTxt = outputTxt;             

                } 

        @Override
        protected ArrayList<String> doInBackground(Integer... uri) {

            ArrayList<String> result = new ArrayList<String>();

                result.add(uri[0] + " " );

            return result;
        }

        @Override
        protected void onPostExecute(ArrayList<String> result) {
            super.onPostExecute(result);

            outTxt.setText(result.get(0));

        }

    }