类概述BaseAdapter主要用于ListView(实现指定的ListAdapter接口)、Spinner(实现指定的SpinnerAdapter接口)以及GridView的共同实现一个公共基类适配器。假设我们实现一个ArrayListAdapter，public abstract class ArrayListAdapter<T> extends BaseAdapter{protected ArrayList<T> mList;protected Activity mContext;protected ListView mListView;public ArrayListAdapter(Activity context){this.mContext = context;}
@Override//设置像layout中填充的条目数量public int getCount() {if(mList != null)return mList.size();elsereturn 0;}
@Overridepublic Object getItem(int position) {return mList == null ? null : mList.get(position);}
@Overridepublic long getItemId(int position) {return position;}
@Override/*** @param positionposition就是位置从0开始* @param convertViewconvertView是Spinner,ListView中每一项要显示的view* @param parentparent就是父窗体了，也就是Spinner,ListView,GridView了* @return通常return 的view也就是convertView* 绘制的内容均在此实现*/abstract public View getView(int position, View convertView, ViewGroup parent);public void setList(ArrayList<T> list){this.mList = list;notifyDataSetChanged();}public ArrayList<T> getList(){return mList;}public void setList(T[] list){ArrayList<T> arrayList = new ArrayList<T>(list.length);for (T t : list) {arrayList.add(t);}setList(arrayList);}public ListView getListView(){return mListView;}public void setListView(ListView listView){mListView = listView;}
}
