自定义BaseAdapter完美解决ListView异常:java.lang.IllegalStateException这是代码使用方法原理另外

import java.util.ArrayList;
import java.util.List;

import android.util.SparseArray; 
import android.view.View;
import android.view.ViewGroup;

/**
 * @author 肖蕾
 * @param <DataType>
 *            传入的数据类型
 * @param <viewHolder>
 *            ViewHoler的类型
 */
public abstract class BaseAdapter<DataType, viewHolder extends BaseAdapter.Holder> extends android.widget.BaseAdapter
{
    /**
     * 保存的数据
     */
    private List<DataType> list = new ArrayList<DataType>();
    private List<DataType> outer_list;

    public BaseAdapter(List<DataType> list)
    {
        this.outer_list = list;
        this.list.addAll(outer_list);
    }

    @Override
    public int getCount()
    {
        return getItemCount();
    }

    @Override
    public DataType getItem(int position)
    {
        return list.get(position);
    }

    @Override
    public long getItemId(int position)
    {
        return position;
    }
    
    @Override
    public void notifyDataSetChanged()
    {
        this.list.clear();
        this.list.addAll(outer_list);
        super.notifyDataSetChanged();
    }
    
    /**
     * View 的创建
     * 
     * @param parent
     *            父控件
     * @param viewType
     *            类型
     * @return
     */
    public abstract viewHolder onCreateViewHolder(ViewGroup parent, int viewType);

    /**
     * ViewHolder与数据的绑定
     * 
     * @param holder
     *            viewHoler对象
     * @param data
     *            数据
     * @param position
     *            定位
     */
    public abstract void onBindViewHolder(viewHolder holder, DataType data, int position);

    public int getItemCount()
    {
        if (list == null)
        {
            return 0;
        }
        return list.size();
    }

    public int getItemViewType(DataType data, int position)
    {
        return super.getItemViewType(position);
    }

    @SuppressWarnings("unchecked")
    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        viewHolder holder = null;
        DataType data = list.get(position);
        if (convertView == null)
        {
            holder = onCreateViewHolder(parent, getItemViewType(data, position));
            convertView = holder.getRootView();
        } else
        {
            holder = (viewHolder) convertView.getTag();
        }
        onBindViewHolder(holder, data, position);
        return convertView;
    }

    public static class Holder
    {
        private View root;
        private SparseArray<View> store = new SparseArray<View>();
        
        @SuppressWarnings("unchecked")
        public <T extends View> T get(int id) 
        {
            View result = store.get(id);
            if(result == null)
            {
                result = root.findViewById(id);
                store.append(id, result);
            }
            return (T) result;
        }

        public Holder(View view)
        {
            this.root = view;
        }

        public View getRootView()
        {
            root.setTag(this);
            return root;
        }
    }
}

public class mAdapter extends BaseAdaptor<String, BaseAdaptor.Holder>
{
    public mAdapter(List<String> list)
    {
        super(list);
    }
    /**
    * 新建一个ViewHoler
    */
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
    {
        View view = View.inflate(parent.getContext(), R.layout.item, null);
        Holder holder = new Holder(view);
        return holder;
    }
    /**
    * ViewHoler与数据绑定
    */
    @Override
    public void onBindViewHolder(Holder holder, String data, int position)
    {
        TextView text = holder.get(R.id.text);
        text.setText(data);
    }
}