package momo.com.week10_project.adapter;

import android.content.Context;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import java.util.List;

/**

* 自定义抽象万能 BaseAdapter

* 可传入任意数据源、布局

*/

public abstract class AbstractBaseAdapter<T> extends BaseAdapter{

//数据源

List<T> data;

//LayoutInflater

LayoutInflater inflater;

//布局资源

int[] layoutId;

int countSum = -1;

//构造方法

public AbstractBaseAdapter(Context context, List<T> data ,int ...layoutId) {

this.layoutId = layoutId;

this.data = data;

inflater = LayoutInflater.from(context);

}

/**

* 定义itemCount

*/

public void setCount(int count)

{

countSum = count;

//this.notifyDataSetChanged();

}

@Override

public int getCount() {

if (countSum == -1)

{

return data.size();

}

else

{

return countSum;

}

}

@Override

public Object getItem(int position) {

if (countSum == -1)

{

return data.get(position);

}

else

{

return data.get(countSum % data.size());

}

}

@Override

public long getItemId(int position) {

return position;

}

//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

public int getViewTypeCount() {

return layoutId.length;

}

//抽象绑定数据的方法

public abstract void bindData(int position, ViewHolder holder);

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null;

//得到当前数据布局类型

int layoutType = getItemViewType(position);

if (convertView == null) {

//根据类型加载不同的布局

convertView = inflater.inflate(layoutId[layoutType], parent, false);

holder = new ViewHolder(convertView);

convertView.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

//绑定数据

bindData(position, holder);

return convertView;

}

public static class ViewHolder {

//保存的控件：是需要设置值的控件

private View view;

public ViewHolder(View view) {

this.view = view;

}

//向子类提供一个方法，返回需要设置值的控件

public View findViewById(int viewId) {

//根据viewid，找到对应的控件

return view.findViewById(viewId);

}

}

}