Android 购物车的实现

实现了购物车的全选 全不选  选中删除   选中状态下数量添加时总价随之添加等基本功能。

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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<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>();

	@Override
	protected 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的下一个開始
			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>
	{
		@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(), "加入成功！", 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<Integer> ids = getSelectedIds();
				doDelete(ids);
			} else
			{
				Toast.makeText(getApplicationContext(), "结算", 0).show();
			}

			break;

		default:
			break;
		}
	}

}

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