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;// adapterprivate List<DataBean> mListData = new ArrayList<DataBean>();// 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<Boolean> mSelectState = new SparseArray<Boolean>();@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main_activity);initView();initListener();loadData();}private void doDelete(List<Integer> 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<Integer> getSelectedIds(){ArrayList<Integer> selectedIds = new ArrayList<Integer>();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<DataBean> getData(){int maxId = 0;if (mListData != null && mListData.size() > 0)maxId = mListData.get(mListData.size() - 1).getId();List<DataBean> result = new ArrayList<DataBean>();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<DataBean> list;}private class LoadDataTask extends AsyncTask<Params, Void, Result>{@Overrideprotected 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;}@Overrideprotected 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{@Overridepublic int getCount(){return mListData.size();}@Overridepublic Object getItem(int position){return mListData.get(position);}@Overridepublic long getItemId(int position){return position;}@Overridepublic 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(){@Overridepublic void onClick(View v){// TODO Auto-generated method stubint _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(){@Overridepublic void onClick(View v){// TODO Auto-generated method stubif (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);}@Overridepublic 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);}}@Overridepublic void onClick(View v){// TODO Auto-generated method stubswitch (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<Integer> ids = getSelectedIds();doDelete(ids);} else{Toast.makeText(getApplicationContext(), "结算", 0).show();}break;default:break;}}}

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