類概述
BaseAdapter主要用於ListView(實現指定的ListAdapter接口)、Spinner(實現指定的SpinnerAdapter接口)以及GridView的共同實現一個公共基類適配器。
假設我們實現一個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
//設置像layout中填充的條目數量
public int getCount() {
if(mList != null)
return mList.size();
else
return 0;
}
@Override
public Object getItem(int position) {
return mList == null ? null : mList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
/**
* @param position position就是位置從0開始
* @param convertView convertView是Spinner,ListView中每一項要顯示的view
* @param parent parent就是父窗體了,也就是Spinner,ListView,GridView了
* @return 通常return 的view也就是convertView
* 繪制的內容均在此實現
*/
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;
}
}
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