BaseAdapter的抽取

为了更方便高效的使用BaseAdapter，特意抽取了一下，下面是简单的结构图：

需要4个类：

【MyBaseAdapter3】：

public abstract class MyBaseAdapter3<T> extends BaseAdapter {
public List<T> list;

public MyBaseAdapter3(List<T> list) {
this.list = list;
}

@Override
public int getCount() {
return list==null?0:list.size();
}

@Override
public Object getItem(int position) {
return list.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
T t=list.get(position);
BaseHolder holder;
if(convertView==null){
holder=getHolder();
}else{
holder= (BaseHolder) convertView.getTag();
}
//绑定数据
holder.setData(t);
return holder.getRootView();
}
public abstract BaseHolder getHolder();

}

【MyAdapter3】：

public class MyAdapter3 extends MyBaseAdapter3<Product>{

public MyAdapter3(List<Product> list) {
super(list);
}

@Override
public BaseHolder getHolder() {
return new MyHolder();
}
}

【BaseHolder】：

public abstract class BaseHolder<T> {
private View rootView;//每个item
private T t;//每个item的数据

public BaseHolder() {
rootView=initView();
rootView.setTag(this);
ButterKnife.bind(this,rootView);
}

public void setData(T t){
this.t=t;
refreshData(t);
}

public View getRootView() {
return rootView;
}

public abstract View initView();
protected abstract void refreshData(T t);

}

【MyHolder】：

public class MyHolder extends BaseHolder<Product> {

@Bind(R.id.p_name)
TextView pName;
@Bind(R.id.p_money)
TextView pMoney;
@Bind(R.id.p_yearlv)
TextView pYearlv;
@Bind(R.id.p_suodingdays)
TextView pSuodingdays;
@Bind(R.id.p_minzouzi)
TextView pMinzouzi;
@Bind(R.id.p_minnum)
TextView pMinnum;
@Bind(R.id.p_progresss)
RoundProgress2 pProgresss;

@Override
public View initView() {
return UIUtils.getXmlView(R.layout.item_product_list);
//一般将MyHolder写在MyAdapter3里变成内部类，这样上下文就可以使用Activity了
}

@Override
protected void refreshData(Product product) {
pMinnum.setText(product.getMemberNum());
pMinzouzi.setText(product.getMinTouMoney());
pMoney.setText(product.getMoney());
pName.setText(product.getName());
pSuodingdays.setText(product.getSuodingDays());
pYearlv.setText(product.getYearLv());
pProgresss.setProgress(Integer.parseInt(product.getProgress()));
}
}

【说明1】：一般将MyHolder写成适配器的内部类，这样上下文就可以使用Activity，使用Application作为上下文还有有些样式问题的隐患。

【说明2】：MyHolder用到了工具类UIUtils的下面一个方法，MyApplication extends Application

public static View getXmlView(int layoutId){
   return View.inflate(MyApplication.mContext, layoutId, null);
}