我的淘宝简单实现

我的淘宝简单实现

/**
* 自定义Adapter
*
* @author jhao
* @version 1.0
*/
class MyAdapter extends BaseAdapter {
private Context context;
private int res_item_layout = R.layout.productitem;

public MyAdapter(Context context) {
this.context = context;

}

public MyAdapter(Context context, int res_item_layout) {
this.context = context;
this.res_item_layout = res_item_layout;
init();
}

/**
* 初始化内部的用于保存checkbox状态的集合
*/
private void init() {
isSelected = new HashMap<Integer, Boolean>();
for (int i = 0; i < products.size(); i++) {
isSelected.put(i, false);
}
}

/**
* 获取更多（分页获取）
*/
public void more() {
// step 1: 当前页++
pageIndex++;
// step 2:获取更多的数据
List<Product> moreProducts = productManager.getProdcutByPager(
pageIndex, PAGESIZE);
if (moreProducts != null) {
// step 3:添加到现有的集合中
products.addAll(moreProducts);
// 刷新ListView
this.notifyDataSetChanged();
} else {
Tool.ShowMessage(context, "已经是最后一条记录了！");
}
}

/**
* 刷新ListView
*/
public void refresh() {
if (this.isBatchManager())
init();
this.notifyDataSetChanged();
}

/**
* 用于判断是否是处于批量管理状态,true:是，false:否
*
* @return
*/
public boolean isBatchManager() {
return this.res_item_layout == R.layout.productitem2;
}

@Override
public int getCount() {
return products.size() + 2;
}

@Override
public Object getItem(int position) {
return products.get(position - 1);
}

@Override
public long getItemId(int position) {

// return products.get(position - 1).getId();
if (position == 0)// 选中第一项
{
return -1;// 代表点击的是第一项
} else if (position > 0 && (position < this.getCount() - 1)) {
return products.get(position - 1).getId();// 如果用户选中了中间项
// mUserList.get(index-1).getId();
} else {
return -2;// 表示用户选中最后一项
}

}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageView img = null;
TextView title = null;
TextView unitPrice = null;

// 说明是第一项
if (position == 0) {
convertView = inflater.inflate(R.layout.addproductitem, null);
ImageView imgAdd = (ImageView) convertView
.findViewById(R.id.imgAdd);
imgAdd.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Tool.ShowMessage(context, "添加！");
}
});
return convertView;
}
// 说明是最后一项
if (position == this.getCount() - 1) {
convertView = inflater.inflate(R.layout.moreitemsview, null);
return convertView;
}

ViewHolder holder = null;
if (convertView == null
|| convertView.findViewById(R.id.addproduct) != null
|| convertView.findViewById(R.id.linemore) != null) {

/*
* convertView = inflater.inflate(R.layout.productitem, parent,
* false);
*/
holder = new ViewHolder();
convertView = inflater.inflate(this.res_item_layout, parent,
false);
holder.img = (ImageView) convertView
.findViewById(R.id.imgPhoto);
holder.title = (TextView) convertView
.findViewById(R.id.txtName);
holder.unitPrice = (TextView) convertView
.findViewById(R.id.txtUnitPrice);
holder.cBox = (CheckBox) convertView.findViewById(R.id.chkIn);

convertView.setTag(holder);

} else {
holder = (ViewHolder) convertView.getTag();
}

if (holder.cBox != null)
holder.cBox.setChecked(isSelected.get(position - 1));

holder.img.setImageResource(products.get(position - 1).getPhoto());
holder.title.setText(position + "、"
+ products.get(position - 1).getName().toString());
holder.unitPrice.setText(String.valueOf(products.get(position - 1)
.getUnitPrice()));

return convertView;
}

}

public final class ViewHolder {
public ImageView img;
public TextView title;
public TextView unitPrice;
public CheckBox cBox;
}

商品初始化：

private Product[] products={
new Product(1,"三星 GT-S5830", 1, R.drawable.p1,
1630, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(2,"HTC A510e", 1, R.drawable.p2,
1514, "网络类型:WCDMA(3G) 操作系统:ANDROID ")   ,
new Product(3,"三星 I9100", 1, R.drawable.p3,
3266, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(4,"中兴 U880（TD版）", 1,
R.drawable.p4, 989,
"网络类型:TD-SCDMA(3G) 操作系统:ANDROID  "),
new Product(5,"Sony Ericsson索尼爱立信 ", 1,
R.drawable.p5, 2584,
"网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(6,"摩托罗拉 Defy", 1, R.drawable.p6,
1851, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(7,"中兴 V880", 1, R.drawable.p7,
957, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(8,"HTC S710e", 1, R.drawable.p8,
2671, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(9,"摩托罗拉 ME525",1, R.drawable.p9,
1853, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(10,"G12", 1, R.drawable.p10,
2470, "网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(11,"摩托罗拉 ME525+", 1,
R.drawable.p11, 1923,
"网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(12,"Sony Ericsson", 1,
R.drawable.p12, 2231,"网络类型:WCDMA(3G) 操作系统:ANDROID "),
new Product(13,"Lenovo", 1, R.drawable.p13,997, "网络类型:WCDMA(3G) 操作系统:ANDROID ")
};

本例中最重要的一个思想是通过接口， 和XXManager将一些列操作进行封装， 进行了松耦合