Android_Utils/AbstractBaseAdapter.java at master · RealMoMo/Android_Utils · GitHub

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packagemomo.com.week10_project.adapter;

importandroid.content.Context;
importandroid.view.LayoutInflater;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.widget.BaseAdapter;

importjava.util.List;

/**
 * 自定义抽象万能 BaseAdapter
 * 可传入任意数据源、布局
 */
publicabstractclassAbstractBaseAdapter<T> extendsBaseAdapter{
//数据源
List<T> data;
//LayoutInflater
LayoutInflaterinflater;
//布局资源
int[] layoutId;

intcountSum = -1;

//构造方法
publicAbstractBaseAdapter(Contextcontext, List<T> data ,int ...layoutId) {
this.layoutId = layoutId;
this.data = data;
inflater = LayoutInflater.from(context);
 }


/**
 * 定义itemCount
 */
publicvoidsetCount(intcount)
 {
countSum = count;
//this.notifyDataSetChanged();

 }

@Override
publicintgetCount() {
if (countSum == -1)
 {
returndata.size();
 }
else
 {
returncountSum;
 }
 }

@Override
publicObjectgetItem(intposition) {
if (countSum == -1)
 {
returndata.get(position);
 }
else
 {
returndata.get(countSum % data.size());
 }
 }

@Override
publiclonggetItemId(intposition) {
returnposition;
 }

//重写getViewTypeCount(因为可能传入的布局有多个)
//返回Listview布局种类个数，即布局资源id数组的长度
@Override
publicintgetViewTypeCount() {
returnlayoutId.length;
 }

//抽象绑定数据的方法
publicabstractvoidbindData(intposition, ViewHolderholder);

@Override
publicViewgetView(intposition, ViewconvertView, ViewGroupparent) {
ViewHolderholder = null;
//得到当前数据布局类型
intlayoutType = getItemViewType(position);
if (convertView == null) {
//根据类型加载不同的布局
convertView = inflater.inflate(layoutId[layoutType], parent, false);
holder = newViewHolder(convertView);
convertView.setTag(holder);
 } else {
holder = (ViewHolder) convertView.getTag();
 }

//绑定数据
bindData(position, holder);


returnconvertView;
 }

publicstaticclassViewHolder {
//保存的控件：是需要设置值的控件
privateViewview;

publicViewHolder(Viewview) {
this.view = view;
 }


//向子类提供一个方法，返回需要设置值的控件
publicViewfindViewById(intviewId) {
//根据viewid，找到对应的控件
returnview.findViewById(viewId);
 }

 }

}