问题是当发生方向改变时,不仅寻呼机而且适配器被重新加载 – 我知道如何保存当前的寻呼机位置,但是当适配器被重置时,它也从该组中选择新的问题.处理这个问题的正确方法是什么？

另外,附带问题 – 在RadioGroups上注册选项的最佳方式是什么？直接点击或以不同的方式？

我是Android应用程序开发的新手.

活动：

public class MyActivity extends SherlockActivity {
    ActionBar actionBar;
    ViewPager pager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        pager = new ViewPager(this);
        setContentView(pager);
        QuestionsAdapter adapter = new QuestionsAdapter(this);
        pager.setAdapter(adapter);

        int position = 0;
        if (savedInstanceState != null) {
            position = savedInstanceState.getInt("Q_NUMBER");
        }         
        pager.setCurrentItem(position);
    }

    @Override
    public void onSaveInstanceState(Bundle savedInstanceState) {
        int position = pager.getCurrentItem();
        savedInstanceState.putInt("Q_NUMBER",position);
    }
}

适配器：

class QuestionsAdapter extends PagerAdapter {
    Context context;
    QuestionsHelper dbQuestions;
    boolean exam;
    List<HashMap<String,Object>> examQuestions;

    public QuestionsAdapter(Context context,boolean exam) {
        this.context = context;
        this.examQuestions = GetQuestionsFromDB(30);
    }

    public Object instantiateItem(View collection,int position) {
        LayoutInflater inflater = (LayoutInflater) collection.getContext()
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view;
        HashMap<String,Object> q;

        view = inflater.inflate(R.layout.exam_question_layout,null);
        q = getQuestion(position+1);

        ((TextView)view.findViewById(R.id.q_number)).setText(Integer.toString(position+1)+".");
        ((TextView)view.findViewById(R.id.q_question)).setText(q.get("question").toString());
        ((RadioButton)view.findViewById(R.id.q_answer_a)).setText(q.get("answer_a").toString());
        ((RadioButton)view.findViewById(R.id.q_answer_b)).setText(q.get("answer_b").toString());
        ((RadioButton)view.findViewById(R.id.q_answer_c)).setText(q.get("answer_c").toString());

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