java泛型操作复习，以及讲解在android中使用的场景

public abstract class EasyAdapter<T> extends BaseAdapter {
    private LayoutInflater inflater;
    private int layoutId;
    private List<T> mlist = new ArrayList<T>();

    public EasyAdapter(Context context, int layoutId, List<T> list) {
        super();
        this.inflater = LayoutInflater.from(context);
        this.layoutId = layoutId;
        this.mlist = list;
    }

    /**
     * 往顶部添加数据
     * 
     * @param list
     */
    public void add2Head(List<T> list) {
        mlist.addAll(0, list);
        notifyDataSetChanged();
    }
    
    public void clearAll() {
        mlist.clear();
        notifyDataSetChanged();
    }

    public List<T> getAllList() {
        return mlist;
    }

    /**
     * 往底部添加数据
     * 
     * @param list
     */
    public void add2Bottom(List<T> list) {
        mlist.addAll(list);
        notifyDataSetChanged();
    }

    public void add2Bottom(T t) {
        mlist.add(t);
        notifyDataSetChanged();
    }

    /**
     * @Title: updateListView
     * @Description: TODO(更新BaseAdapter中的数据)
     * @param @param list 设定文件
     * @return void 返回类型
     * @throws
     */
    public void updateListView(List<T> list) {
        mlist = list;
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return mlist.size();
    }

    @Override
    public T getItem(int position) {
        return mlist.get(position);
    }

    @Override
    public long getItemId(int position) {

        return position;
    }

    /**
     * 实际显示View的方法，使用抽象方法强制调用者覆写！
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder viewHolder = ViewHolder.getViewHolder(parent, convertView,
                inflater, layoutId);
        convert(viewHolder, mlist.get(position));
        return viewHolder.getConvertView();

    }

    public abstract void convert(ViewHolder viewHolder, T t);

}

public class GsonImpl extends Json {
    private Gson gson = new Gson();

    @Override
    public String toJson(Object src) {
        return gson.toJson(src);
    }

    @Override
    public <T> T toObject(String json, Class<T> claxx) {
        return gson.fromJson(json, claxx);
    }

    @Override
    public <T> T toObject(byte[] bytes, Class<T> claxx) {
        return gson.fromJson(new String(bytes), claxx);
    }

    @Override
    public <T> List<T> toList(String json, Class<T> claxx) {
          Type type = new TypeToken<ArrayList<T>>() {}.getType();  
             List<T> list = gson.fromJson(json, type);  
        return list;
    }

}