android - ビューの状態をビューページャーに保存

Question

これは、この質問ViewPager とフラグメントのフォローアップです — フラグメントの状態を保存する正しい方法は何ですか? . 回答のこの部分をコードで解釈する人が必要です。

Another approach is to override FragmentPageAdapter.instantiateItem(View, int) and save a reference to the fragment returned from the super call before returning it (it has the logic to find the fragment, if already present).

を使用してPagerAdapter、カーソルからビューページャーにデータをロードしています。私はすでにPagerAdapter.intantiateItem. 必要なのは、クリックされたボタンの状態を保存できることだけです。これは私のコードです

    public class CustomQuestionPagerAdapter extends PagerAdapter {

private Cursor cursor;
private Cursor cursorCategory;
private LayoutInflater inflater;
private Context context;
private ArrayList<String> optionsArray; 
String rightAnswer;
String wrongAnswer1;
String wrongAnswer2;
Button option1;
Button option2;
Button option3;

public CustomQuestionPagerAdapter(Context context, Cursor cursor1, Cursor cursor2) {
    this.context = context;
    this.cursor = cursor1;
    this.cursorCategory = cursor2;
    this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}        

public void swapCursor(Cursor cursor) {
    this.cursor = cursor;
}

public void swapAnotherCursor(Cursor cursor) {
    this.cursorCategory = cursor;
}


public void destroyItem(View view, int position, Object object) {
    ((ViewPager) view).removeView((ScrollView) object);
}

@Override
public int getCount() {
    if (cursor == null) {
        return 0;
    }else {
        return cursor.getCount();
    }
}



/* (non-Javadoc)
 * @see android.support.v4.view.PagerAdapter#instantiateItem(android.view.View, int)
 */


@Override
public Object instantiateItem(View view, int position) {

    cursor.moveToPosition(position);
    final ViewPager pager = (ViewPager) view.findViewById(R.id.pager_nav);
    ScrollView layout = (ScrollView) inflater.inflate(R.layout.question_activity, null);
    if (cursorCategory != null && cursorCategory.moveToFirst()){
        String s = cursorCategory.getString(cursorCategory.getColumnIndex("name"));
        ((TextView)layout.findViewById(R.id.text_category)).setText(s);
    }

    Typeface tpf = Typeface.createFromAsset(context.getAssets(), "Roboto-Light.ttf");
    String text = cursor.getString(cursor.getColumnIndex("question_text"));
    TextView question_text =  (TextView)layout.findViewById(R.id.text_question);
    question_text.setText(text);
    question_text.setTypeface(tpf);

    String qPos = Integer.toString(position + 1) + ".";
    TextView question_position = (TextView) layout.findViewById(R.id.text_position);
    question_position.setText(qPos);
    question_position.setTypeface(tpf);

    this.rightAnswer = cursor.getString(cursor.getColumnIndex(DBHelper.RIGHT_ANSWER));
    this.wrongAnswer1 = cursor.getString(cursor.getColumnIndex(DBHelper.WRONG_ANSWER1));
    this.wrongAnswer2 = cursor.getString(cursor.getColumnIndex(DBHelper.WRONG_ANSWER2));

    optionsArray = new ArrayList<String>();
    optionsArray.clear();
    optionsArray.add(this.rightAnswer);
    optionsArray.add(this.wrongAnswer1);
    optionsArray.add(this.wrongAnswer2);
    Collections.shuffle(optionsArray);

    option1 = (Button) layout.findViewById(R.id.button_option1);
    option1.setText((CharSequence) this.optionsArray.get(0));

    option2 = (Button) layout.findViewById(R.id.button_option2);
    option2.setText((CharSequence) this.optionsArray.get(1));

    option3 = (Button) layout.findViewById(R.id.button_option3);
    option3.setText((CharSequence) this.optionsArray.get(2));


    final Button next = (Button) layout.findViewById(R.id.next_button);
    next.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            int j = getItem(+1) + 1;
            Toast.makeText(context, context.getResources().getString(R.string.question_no) + " " + j, Toast.LENGTH_SHORT).show();
            pager.setCurrentItem(getItem(+1), true);
            next.setBackgroundColor(0xffeeeeee); // i need to save this new bacground color
        }

        private int getItem(int i) {
            return i += pager.getCurrentItem();
        }
    });

私もこの答えを試しましたが、ViewPagerでフラグメント状態を保存することはできませんでした

前もって感謝します。