在Android的ListView中加载更多选项

Android ListView] ListView应该显示前10个结果，然后当我单击“ LoadMore option”时，它应该显示类似“ LoadMore”的选项，然后listview将显示另外10个结果，然后应再次显示“ LoadMore”选项。 。

XML格式

<ListView
      android:id="@+id/subCategory"
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="5"
      android:cacheColorHint="@android:color/transparent"
      android:divider="#fff"
      android:dividerHeight="1dp"
      android:fadingEdge="none">
 </ListView>

适配器类

public class ListAdapter extends BaseAdapter {

    private ArrayList<String>   mData   = new ArrayList<String>();
    private LayoutInflater      mInflater;

    public MobileListAdapter(Activity activity) {
        mInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

    public void addItem(String item) {
        mData.add(item);
        notifyDataSetChanged();
    }

    public int getCount() {
        return mData.size();
    }

    public String getItem(int position) {
        return mData.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = mInflater.inflate(R.layout.mobile_page, parent, false);
            holder.textView = (TextView) convertView.findViewById(R.id.text);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        String str = mData.get(position);
        holder.textView.setText(str);
        return convertView;
    }

    public class ViewHolder {
        public TextView textView;
    }

}

活动类

public void setData() {
    mobileList = new ArrayList<String>();
    mAdapter = new ListAdapter(this);
    for (int i = 0; i < str.length; i++) {
        mAdapter.addItem(str[i]);
        mobileList.add(str[i]);
    }
    Button btnLoadMore = new Button(this);
    btnLoadMore.setText("Load More");
    lv.addFooterView(btnLoadMore);
    lv.setAdapter(mAdapter);
    btnLoadMore.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View arg0) {
            // Starting a new async task
            //new loadMoreListView().execute();
        }
    });

现在我还要做些什么来显示loadmore选项