Android 购物车的实现
实现了购物车的全选 全不选 选中删除 选中状态下数量增加时总价随之增加等基本功能。
实现代码逻辑
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.SparseArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener
{
private static final int INITIALIZE = 0;
private ListView mListView;// 列表
private ListAdapter mListAdapter;// adapter
private List mListData = new ArrayList();// 数据
private boolean isBatchModel;// 是否可删除模式
private RelativeLayout mBottonLayout;
private CheckBox mCheckAll; // 全选 全不选
private TextView mEdit; // 切换到删除模式
private TextView mPriceAll; // 商品总价
private TextView mSelectNum; // 选中数量
private TextView mFavorite; // 移到收藏夹
private TextView mDelete; // 删除 结算
private int totalPrice = 0; // 商品总价
/** 批量模式下，用来记录当前选中状态 */
private SparseArray mSelectState = new SparseArray();
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
initView();
initListener();
loadData();
}
private void doDelete(List ids)
{
for (int i = 0; i < mListData.size(); i++)
{
long dataId = mListData.get(i).getId();
for (int j = 0; j < ids.size(); j++)
{
int deleteId = ids.get(j);
if (dataId == deleteId)
{
mListData.remove(i);
i--;
ids.remove(j);
j--;
}
}
}
refreshListView();
mSelectState.clear();
totalPrice = 0;
mSelectNum.setText("已选" + 0 + "件商品");
mPriceAll.setText("￥" + 0.00 + "");
mCheckAll.setChecked(false);
}
private final List getSelectedIds()
{
ArrayList selectedIds = new ArrayList();
for (int index = 0; index < mSelectState.size(); index++)
{
if (mSelectState.valueAt(index))
{
selectedIds.add(mSelectState.keyAt(index));
}
}
return selectedIds;
}
private void initView()
{
mBottonLayout = (RelativeLayout) findViewById(R.id.cart_rl_allprie_total);
mCheckAll = (CheckBox) findViewById(R.id.check_box);
mEdit = (TextView) findViewById(R.id.subtitle);
mPriceAll = (TextView) findViewById(R.id.tv_cart_total);
mSelectNum = (TextView) findViewById(R.id.tv_cart_select_num);
mFavorite = (TextView) findViewById(R.id.tv_cart_move_favorite);
mDelete = (TextView) findViewById(R.id.tv_cart_buy_or_del);
mListView = (ListView) findViewById(R.id.listview);
mListView.setSelector(R.drawable.list_selector);
}
private void initListener()
{
mEdit.setOnClickListener(this);
mDelete.setOnClickListener(this);
mCheckAll.setOnClickListener(this);
}
private void loadData()
{
new LoadDataTask().execute(new Params(INITIALIZE));
}
private void refreshListView()
{
if (mListAdapter == null)
{
mListAdapter = new ListAdapter();
mListView.setAdapter(mListAdapter);
mListView.setOnItemClickListener(mListAdapter);
} else
{
mListAdapter.notifyDataSetChanged();
}
}
private List getData()
{
int maxId = 0;
if (mListData != null && mListData.size() > 0)
maxId = mListData.get(mListData.size() - 1).getId();
List result = new ArrayList();
DataBean data = null;
for (int i = 0; i < 20; i++)
{
data = new DataBean();
data.setId(maxId + i + 1);// 从最大Id的下一个开始
data.setShopName("我的" + (maxId + 1 + i) + "店铺");
data.setContent("我的购物车里面的第" + (maxId + 1 + i) + "个商品");
data.setCarNum(1);
data.setPrice(305f);
result.add(data);
}
return result;
}
class Params
{
int op;
public Params(int op)
{
this.op = op;
}
}
class Result
{
int op;
List list;
}
private class LoadDataTask extends AsyncTask
{
@Override
protected Result doInBackground(Params... params)
{
Params p = params[0];
Result result = new Result();
result.op = p.op;
try
{// 模拟耗时
Thread.sleep(500L);
} catch (InterruptedException e)
{
e.printStackTrace();
}
result.list = getData();
return result;
}
@Override
protected void onPostExecute(Result result)
{
super.onPostExecute(result);
if (result.op == INITIALIZE)
{
mListData = result.list;
} else
{
mListData.addAll(result.list);
Toast.makeText(getApplicationContext(), "添加成功！", Toast.LENGTH_SHORT).show();
}
refreshListView();
}
}
private class ListAdapter extends BaseAdapter implements OnItemClickListener
{
@Override
public int getCount()
{
return mListData.size();
}
@Override
public Object getItem(int position)
{
return mListData.get(position);
}
@Override
public long getItemId(int position)
{
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent)
{
ViewHolder holder = null;
View view = convertView;
if (view == null)
{
view = LayoutInflater.from(MainActivity.this).inflate(R.layout.cart_list_item, null);
holder = new ViewHolder(view);
view.setTag(holder);
} else
{
holder = (ViewHolder) view.getTag();
}
DataBean data = mListData.get(position);
bindListItem(holder, data);
holder.add.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
int _id = (int) mListData.get(position).getId();
boolean selected = mSelectState.get(_id, false);
mListData.get(position).setCarNum(mListData.get(position).getCarNum() + 1);
notifyDataSetChanged();
if (selected)
{
totalPrice += mListData.get(position).getPrice();
mPriceAll.setText("￥" + totalPrice + "");
}
}
});
holder.red.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
if (mListData.get(position).getCarNum() == 1)
return;
int _id = (int) mListData.get(position).getId();
boolean selected = mSelectState.get(_id, false);
mListData.get(position).setCarNum(mListData.get(position).getCarNum() - 1);
notifyDataSetChanged();
if (selected)
{
totalPrice -= mListData.get(position).getPrice();
mPriceAll.setText("￥" + totalPrice + "");
}
}
});
return view;
}
private void bindListItem(ViewHolder holder, DataBean data)
{
holder.shopName.setText(data.getShopName());
holder.content.setText(data.getContent());
holder.price.setText("￥" + data.getPrice());
holder.carNum.setText(data.carNum + "");
int _id = data.getId();
boolean selected = mSelectState.get(_id, false);
holder.checkBox.setChecked(selected);
}
@Override
public void onItemClick(AdapterView parent, View view, int position, long id)
{
DataBean bean = mListData.get(position);
ViewHolder holder = (ViewHolder) view.getTag();
int _id = (int) bean.getId();
boolean selected = !mSelectState.get(_id, false);
holder.checkBox.toggle();
if (selected)
{
mSelectState.put(_id, true);
totalPrice += bean.getCarNum() * bean.getPrice();
} else
{
mSelectState.delete(_id);
totalPrice -= bean.getCarNum() * bean.getPrice();
}
mSelectNum.setText("已选" + mSelectState.size() + "件商品");
mPriceAll.setText("￥" + totalPrice + "");
if (mSelectState.size() == mListData.size())
{
mCheckAll.setChecked(true);
} else
{
mCheckAll.setChecked(false);
}
}
}
class ViewHolder
{
CheckBox checkBox;
ImageView image;
TextView shopName;
TextView content;
TextView carNum;
TextView price;
TextView add;
TextView red;
public ViewHolder(View view)
{
checkBox = (CheckBox) view.findViewById(R.id.check_box);
shopName = (TextView) view.findViewById(R.id.tv_source_name);
image = (ImageView) view.findViewById(R.id.iv_adapter_list_pic);
content = (TextView) view.findViewById(R.id.tv_intro);
carNum = (TextView) view.findViewById(R.id.tv_num);
price = (TextView) view.findViewById(R.id.tv_price);
add = (TextView) view.findViewById(R.id.tv_add);
red = (TextView) view.findViewById(R.id.tv_reduce);
}
}
@Override
public void onClick(View v)
{
// TODO Auto-generated method stub
switch (v.getId())
{
case R.id.subtitle:
isBatchModel = !isBatchModel;
if (isBatchModel)
{
mEdit.setText(getResources().getString(R.string.menu_enter));
mDelete.setText(getResources().getString(R.string.menu_del));
mBottonLayout.setVisibility(View.GONE);
mFavorite.setVisibility(View.VISIBLE);
} else
{
mEdit.setText(getResources().getString(R.string.menu_edit));
mFavorite.setVisibility(View.GONE);
mBottonLayout.setVisibility(View.VISIBLE);
mDelete.setText(getResources().getString(R.string.menu_sett));
}
break;
case R.id.check_box:
if (mCheckAll.isChecked())
{
totalPrice = 0;
if (mListData != null)
{
mSelectState.clear();
int size = mListData.size();
if (size == 0)
{
return;
}
for (int i = 0; i < size; i++)
{
int _id = (int) mListData.get(i).getId();
mSelectState.put(_id, true);
totalPrice += mListData.get(i).getCarNum() * mListData.get(i).getPrice();
}
refreshListView();
mPriceAll.setText("￥" + totalPrice + "");
mSelectNum.setText("已选" + mSelectState.size() + "件商品");
}
} else
{
if (mListAdapter != null)
{
totalPrice = 0;
mSelectState.clear();
refreshListView();
mPriceAll.setText("￥" + 0.00 + "");
mSelectNum.setText("已选" + 0 + "件商品");
}
}
break;
case R.id.tv_cart_buy_or_del:
if (isBatchModel)
{
List ids = getSelectedIds();
doDelete(ids);
} else
{
Toast.makeText(getApplicationContext(), "结算", 0).show();
}
break;
default:
break;
}
}
}
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