避免ListView项重复

Question

我正在尝试在ListView中显示其子项后面的一些项目。为此，我已将Collection（ArrayList）传递给ListView Adapter类以显示每个项目。对于子项，我必须借助每个位置Id从SQLite数据库中获取数据，并为每个子项创建动态视图。幸运的是它显示所有项目和子项目，但多次。此外，当我点击一些动态视图加载后，列表再次创建相同的视图3/4次。

适配器类：

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    ViewHolder mViewHolder;
    LayoutInflater mInflater;

    if(convertView == null){
        mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        mViewHolder = new ViewHolder();
        convertView = mInflater.inflate(R.layout.customincidentquestion, null);         
        mViewHolder.customLayout = (LinearLayout)convertView.findViewById(R.id.linearLayoutCustomIncidentQuestionList);
        mViewHolder.question = (TextView) convertView.findViewById(R.id.textViewQuestion);
        convertView.setTag(mViewHolder);
    } else {
        mViewHolder = (ViewHolder)convertView.getTag();
    }

    ArrayList<IncidentOptionHolder> mOptionCollection = new ArrayList<IncidentOptionHolder>();
    ArrayList<String> optionText = new ArrayList<String>();
    ArrayList<String> orderedId = new ArrayList<String>();
    Log.v("POSITION", String.valueOf(position));
    IncidentQuestionHolder mHolder = mQuestionData.get(position);
    String mServerId = mQuestionData.get(position).getId();
    Log.e("mServerId", mQuestionData.get(position).getId());



    String mQText = mHolder.getqText();
    Log.e("mQText", mQText);
    String mType = mHolder.getType();
    String mOrderId = mHolder.getOrderId();
    String mIsMandatory = mHolder.getIsMandatory();
    String mIsOption = mHolder.getIsOption();

            Log.v("Equality", "Not Equal");
            IncidentOption mOptions = new IncidentOption(mContext);
            mOptions.open();
            mOptionCollection = mOptions.getOptions(mServerId);
            mOptions.close();

            //if(mViewHolder.customLayout.getChildAt(0) == null){
                mViewHolder.question.setText(mQText);
            for (int i = 0; i < mOptionCollection.size(); i++) {
                //optionText.add(mOptionCollection.get(i).getOptionText());
                //orderedId.add(mOptionCollection.get(i).getOrderId());
                Log.e("mOptionCollection.get(i).getOptionText()", mOptionCollection.get(i).getOptionText());


                if (mType.equals("Cb")) {
                    Log.v("TYPE", "Check Box");
                    LinearLayout ll = new LinearLayout(mContext);
                    ll.setOrientation(LinearLayout.VERTICAL);
                    ll.setPadding(10, 10, 10, 10);
                    CheckBox product = new CheckBox(mContext);
                    product.setText(mOptionCollection.get(i).getOptionText());
                    product.setGravity(Gravity.CENTER_VERTICAL);
                    product.setBackgroundResource(R.drawable.bg_designs);
                    product.setPadding(50, 10, 10, 30);
                    ll.addView(product);
                    mViewHolder.customLayout.addView(ll);
                }

                else if (mType.equals("Ta")) {
                    LinearLayout ll = new LinearLayout(mContext);
                    ll.setOrientation(LinearLayout.VERTICAL);
                    ll.setPadding(10, 10, 10, 10);
                    Log.v("TYPE", "Text Box");
                    LinearLayout lll = new LinearLayout(mContext);
                    lll.setOrientation(LinearLayout.VERTICAL);
                    TextView tv = new TextView(mContext);
                    tv.setText(mOptionCollection.get(i).getOptionText());
                    lll.addView(tv);

                    EditText ta = new EditText(mContext);

                    ta.setPadding(10, 10, 10, 10);
                    ta.setBackgroundResource(R.drawable.bg_designs);
                    lll.addView(ta);
                    ll.addView(lll);
                    mViewHolder.customLayout.addView(ll);
                }

                else if (mType.equals("Rb")) {
                    LinearLayout ll = new LinearLayout(mContext);
                    ll.setOrientation(LinearLayout.VERTICAL);
                    ll.setPadding(10, 10, 10, 10);
                    Log.v("TYPE", "Radio Button");
                    RadioButton rb = new RadioButton(mContext);
                    rb.setText(mOptionCollection.get(i).getOptionText());
                    rb.setGravity(Gravity.CENTER_VERTICAL);
                    rb.setPadding(50, 10, 10, 30);
                    rb.setBackgroundResource(R.drawable.bg_designs);
                    ll.addView(rb);
                    mViewHolder.customLayout.addView(ll);
                }
                else{
                    Log.v("TYPE", "Nothing");
                }


            }


    return convertView;


}

public static class ViewHolder {
    public LinearLayout customLayout = null;
    public TextView question;
}

对于子项目，我不需要使用可扩展列表。

可以建议我在哪里犯了错误，迫使ListView多次加载相同的项目。