Android实现购物车功能

最近看了一些淘宝购物车的demo，于是也写了一个。

效果图如下：

主要代码如下：
actvity中的代码：

public class ShoppingCartActivity extends BaseActivity {

  private List data;
  private ListView mListView;
  private ShoppingCartAdapter adapter;

  private RelativeLayout rlRefresh;
  private TextView tvRefresh;
  private ProgressBar barRefresh;
  private LinearLayout clear;
  private CheckBox checkBox_select_all;
  private CheckBox checkBox_add;
  private TextView integral_sum;
  private int sum = 0;
  private int[] sumIntegral;
  private Context context;

  @Override
  protected void onCreate(Bundle bundle) {
    // TODO Auto-generated method stub
    super.onCreate(bundle);
    setContentView(R.layout.activity_shopping_cart);
    initView();
  }

  private void initView() {
    context = this;
    showpage = 1;
    isPermitFlag = true;
    data = new ArrayList();
    // 测试数据
    data.add(new Test("id", "color", "type", "100"));
    data.add(new Test("id", "color", "type", "200"));
    data.add(new Test("id", "color", "type", "300"));
    data.add(new Test("id", "color", "type", "0"));
    data.add(new Test("id", "color", "type", "300"));
    data.add(new Test("id", "color", "type", "100"));
    data.add(new Test("id", "color", "type", "500"));
    data.add(new Test("id", "color", "type", "0"));
    data.add(new Test("id", "color", "type", "900"));

    adapter = new ShoppingCartAdapter(context, handler, data);

    sumIntegral = new int[data.size() + 1];

    checkBox_add = (CheckBox) findViewById(R.id.checkbox_add);
    integral_sum = (TextView) findViewById(R.id.integral_sum);
    clear = (LinearLayout) findViewById(R.id.clear);
    clear.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {
        data.clear();
        adapter.notifyDataSetChanged();
        integral_sum.setText(0 + "");
        checkBox_select_all.setChecked(false);
        checkBox_add.setClickable(false);
      }
    });
    checkBox_select_all = (CheckBox) findViewById(R.id.checkbox_select);
    checkBox_select_all.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        HashMap isSelected = ShoppingCartAdapter
            .getIsSelected();
        Iterator iterator = isSelected.entrySet().iterator();
        List array = new ArrayList();//列表中checkbox选中状态
        List nums = new ArrayList();//列表中商品数量
        while (iterator.hasNext()) {
          HashMap.Entry entry = (HashMap.Entry) iterator.next();
          Integer key = (Integer) entry.getKey();
          Boolean val = (Boolean) entry.getValue();
          array.add(val);
        }
        for (int i = 0; i < data.size(); i++) {
          int num = data.get(i).getNum();
          int integral = Integer.valueOf(data.get(i).getIntegral());
          nums.add(num);
        }
        if (checkBox_select_all.isChecked()) {

          for (int i = 0; i < data.size(); i++) {
            ShoppingCartAdapter.getIsSelected().put(i, true);
          }
          checkBox_add.setChecked(true);
          adapter.notifyDataSetChanged();
        } else {
          for (int i = 0; i < data.size(); i++) {
            ShoppingCartAdapter.getIsSelected().put(i, false);
          }
          checkBox_add.setChecked(false);
          adapter.notifyDataSetChanged();
          integral_sum.setText(0 + "");
        }

      }
    });
    mListView= (ListView) findViewById(R.id.finance_list);
    mListView.setAdapter(adapter);
    mListView.setOnItemClickListener(new OnItemClickListener() {

      @Override
      public void onItemClick(AdapterView parent, View view,
          int position, long id) {
        Toast.makeText(context, position + "", Toast.LENGTH_LONG)
            .show();

        int pos = position - 1;
        ViewHolder viewHolder = (ViewHolder) view.getTag();
        int num = data.get(pos).getNum();
        if (num == 0) {
          Toast.makeText(context, "请选择商品数量", Toast.LENGTH_LONG)
              .show();
        } else {
          boolean cu = !ShoppingCartAdapter.getIsSelected().get(pos);
          ShoppingCartAdapter.getIsSelected().put(pos, cu);
          adapter.notifyDataSetChanged();
          //遍历获取列表中checkbox的选中状态
          HashMap isSelected = ShoppingCartAdapter
              .getIsSelected();
          Iterator iterator = isSelected.entrySet().iterator();
          List array = new ArrayList();
          while (iterator.hasNext()) {
            HashMap.Entry entry = (HashMap.Entry) iterator.next();
            Integer key = (Integer) entry.getKey();
            Boolean val = (Boolean) entry.getValue();
            array.add(val);
          }
          if (Test.isAllFalse(array)) {
            checkBox_select_all.setChecked(false);
            checkBox_add.setChecked(false);
          }
          if (Test.isAllTrue(array)) {
            checkBox_select_all.setChecked(true);
            checkBox_add.setChecked(true);
          }
          if (Test.isHaveOneFasle(array)) {
            checkBox_select_all.setChecked(false);
          }
          if (Test.isHaveOneTrue(array)) {
            checkBox_add.setChecked(true);
          }
        }
      }
    });
  }

  @SuppressLint("HandlerLeak")
  private Handler handler = new Handler(){
    @SuppressWarnings("unchecked")
    @Override
    public void handleMessage(Message msg) {
      super.handleMessage(msg);
      if(msg.what == 10){ //更改选中商品的总价格
        float price = (Float)msg.obj;
        if(price > 0){
          integral_sum.setText(price+"");
        }else{
          integral_sum.setText("0");
        }
      }
      else if(msg.what == 11){
        //列表选中状态
        List array = (List) msg.obj;
        if (Test.isAllFalse(array)) {
          checkBox_select_all.setChecked(false);
          checkBox_add.setChecked(false);
        }
        if (.isAllTrue(array)) {
          checkBox_select_all.setChecked(true);
          checkBox_add.setChecked(true);
        }
        if (Test.isHaveOneFasle(array)) {
          checkBox_select_all.setChecked(false);
        }
        if (Test.isHaveOneTrue(array)) {
          checkBox_add.setChecked(true);
        }
      }
    }
  };

actvity中XML的代码：

-XML中头部可以到网上找一个这里就不放上来了
.checkbox和button的样式可以根据个人喜好设置。

Adaper中的代码：

public class ShoppingCartAdapter extends BaseAdapter {

  private Context context;
  private List loans;
  private LayoutInflater inflater;
  private static HashMap isSelected;
  private static HashMap numbers;
  private Handler handler;
  int num;// 商品数量

  static class ViewHolder { // 自定义控件集合
    public CheckBox ck_select;
    public ImageView pic_goods;
    public TextView id_goods;
    public TextView color_goods;
    public TextView type_goods;
    public TextView integral_goods;
    public AddMinusWidget add_minus;
    public LinearLayout layout;
    public TextView number;
    public Button minus;
    public Button plus;
  }

  /**
   * 实例化Adapter
   * 
   * @param context
   * @param data
   */
  public ShoppingCartAdapter(Context context, Handler handler, List data) {
    this.context = context;
    this.inflater = LayoutInflater.from(context);
    this.loans = data;
    this.handler = handler;
    isSelected = new HashMap();
    numbers = new HashMap();
    initDate();
  }

  private void initDate() {
    for (int i = 0; i < loans.size(); i++) {
      getIsSelected().put(i, false);
      getNumbers().put(i, 1);
    }
  }

  @Override
  public int getCount() {
    return loans.size();
  }

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

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

  @Override
  public View getView(final int position, View convertView, ViewGroup parent) {
    // 自定义视图
    ViewHolder itemView = null;
    if (convertView == null) {
      // 获取list_item布局文件的视图
      itemView = new ViewHolder();
      convertView = inflater.inflate(R.layout.list_shopping_cart_item,
          null);
      // 获取控件对象
      itemView.ck_select = (CheckBox) convertView
          .findViewById(R.id.ck_select);
      itemView.pic_goods = (ImageView) convertView
          .findViewById(R.id.pic_goods);
      itemView.id_goods = (TextView) convertView
          .findViewById(R.id.id_goods);
      itemView.color_goods = (TextView) convertView
          .findViewById(R.id.color_goods);
      itemView.type_goods = (TextView) convertView
          .findViewById(R.id.type_goods);
      itemView.integral_goods = (TextView) convertView
          .findViewById(R.id.integral_goods);
      itemView.number = (TextView) convertView.findViewById(R.id.number);
      itemView.minus = (Button) convertView.findViewById(R.id.minus);
      itemView.plus = (Button) convertView.findViewById(R.id.plus);
      convertView.setTag(itemView);
    } else {
      itemView = (ViewHolder) convertView.getTag();
    }

    init(itemView, position);

    itemView.ck_select.setChecked(getIsSelected().get(position));
    itemView.number.setText(getNumbers().get(position).toString());
    if (getIsSelected().get(position)) {
      itemView.ck_select.setChecked(true);
    } else {
      itemView.ck_select.setChecked(false);
    }

    String a = itemView.number.getText().toString();
    loans.get(position).setNum(Integer.valueOf(a));

    Test test = loans.get(position);
    itemView.id_goods.setText((CharSequence) test.getId());
    itemView.color_goods.setText((CharSequence) test.getColor());
    itemView.type_goods.setText((CharSequence) test.getType());
    itemView.integral_goods.setText((CharSequence) test.getIntegral());
    itemView.pic_goods.setImageResource(R.drawable.shopping);
    return convertView;
  }

  private void init(final ViewHolder itemView, final int position) {

    itemView.ck_select
        .setOnCheckedChangeListener(new OnCheckedChangeListener() {

          @Override
          public void onCheckedChanged(CompoundButton buttonView,
              boolean isChecked) {
            isSelected.put(position, true);
            getIsSelected().put(position, isChecked);
            itemView.ck_select.setChecked(getIsSelected().get(
                position));
            handler.sendMessage(handler.obtainMessage(10,
                getTotalPrice()));

            Iterator iterator = isSelected.entrySet().iterator();
            List array = new ArrayList();
            while (iterator.hasNext()) {
              HashMap.Entry entry = (HashMap.Entry) iterator
                  .next();
              Integer key = (Integer) entry.getKey();
              Boolean val = (Boolean) entry.getValue();
              array.add(val);
            }
            handler.sendMessage(handler.obtainMessage(11, array));
          }
        });

    final String numString = itemView.number.getText().toString();
    itemView.plus.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        if (numString == null || numString.equals("")) {
          num = 1;
          itemView.number.setText("1");
        } else {
          if (++num < 1) // 先加，再判断
          {
            num--;

            Toast.makeText(context, "请输入一个大于0的数字",
                Toast.LENGTH_SHORT).show();
          } else {
            itemView.number.setText(String.valueOf(num));
            loans.get(position).setNum(num);
            numbers.put(position, num);
            handler.sendMessage(handler.obtainMessage(10,
                getTotalPrice()));
            Log.i("test", "+:" + num);
          }
        }
      }
    });
    itemView.minus.setOnClickListener(new OnClickListener() {

      @Override
      public void onClick(View v) {

        if (numString == null || numString.equals("")) {
          num = 1;
          itemView.number.setText("1");
        } else {
          if (--num < 1) // 先加，再判断
          {
            num++;
            Log.i("test", "-:" + num);
            Toast.makeText(context, "请输入一个大于0的数字",
                Toast.LENGTH_SHORT).show();
            Log.i("test", "-:" + num);
          } else {
            itemView.number.setText(String.valueOf(num));
            Log.i("test", "-:" + num);
            loans.get(position).setNum(num);
            numbers.put(position, num);
            handler.sendMessage(handler.obtainMessage(10,
                getTotalPrice()));
          }
        }

      }
    });

  }

  /**
   * 计算选中商品的积分
   * 
   * @return 返回需要付费的总积分
   */
  private float getTotalPrice() {
    Test bean = null;
    float totalPrice = 0;
    for (int i = 0; i < loans.size(); i++) {
      bean = loans.get(i);
      if (ShoppingCartAdapter.getIsSelected().get(i)) {
        totalPrice += bean.getNum()
            * Integer.valueOf(bean.getIntegral());
      }
    }
    return totalPrice;
  }

  public static HashMap getIsSelected() {
    return isSelected;
  }

  public static void setIsSelected(HashMap isSelected) {
    ShoppingCartAdapter.isSelected = isSelected;
  }

  public static HashMap getNumbers() {
    return numbers;
  }

  public static void setNumbers(HashMap numbers) {
    ShoppingCartAdapter.numbers = numbers;
  }
}

Adapter中的XML代码：

实体类：

package com.autoserve.net33.model;


public class Test {
  @Override
  public String toString() {
    return "test [id=" + id + ", color=" + color
        + ", type=" + type + ", integral=" + integral + "]";
  }

  public String getId() {
    return id;
  }
  public void setId(String id) {
    this.id = id;
  }
  public String getColor() {
    return color;
  }
  public void setColor(String color) {
    this.color = color;
  }
  public String getType() {
    return type;
  }
  public void setType(String type) {
    this.type = type;
  }
  public String getIntegral() {
    return integral;
  }
  public void setIntegral(String integral) {
    this.integral = integral;
  }
  private String id;
  private String color;
  private String type;
  private String integral;
  private int num;//商品数量
  private int sumIntegral;
  private boolean isChoosed;   //商品是否在购物车中被选中

  public Test(String id, String color, String type, String integral) {
    super();
    this.id = id;
    this.color = color;
    this.type = type;
    this.integral = integral;
  }
  public Test() {
    super();
  }

  public int getNum() {
    return num;
  }

  public void setNum(int num) {
    this.num = num;
  }

  public int getSumIntegral() {
    return sumIntegral;
  }

  public void setSumIntegral(int sumIntegral) {
    this.sumIntegral = sumIntegral;
  }

  public boolean isChoosed() {
    return isChoosed;
  }

  public void setChoosed(boolean isChoosed) {
    this.isChoosed = isChoosed;
  }  
}

以上就是本文的全部内容，祝大家在新的一年里工作顺利，事事顺心，我们大家共同努力。