Android Studio 简单购物车

其他 2018-07-31 05:10:31 阅读次数: 0

MainActivity的布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:id="@+id/top_bar"
        android:layout_width="match_parent"
        android:layout_height="48dp"
        android:background="#E24146"
        android:orientation="vertical" >
        <TextView
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:minHeight="48dp"
            android:text="购物车"
            android:textColor="#ffffff"
            android:textSize="17sp" />
    </LinearLayout>

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:childIndicator="@null"
        android:groupIndicator="@null" >
    </ListView>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:orientation="horizontal" >

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="2.5"
            android:gravity="center_vertical"
            android:orientation="horizontal" >

            <CheckBox
                android:id="@+id/all_chekbox"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:layout_marginLeft="10dp"
                android:layout_marginRight="4dp"
                android:checkMark="?android:attr/listChoiceIndicatorMultiple"
                android:gravity="center"
                android:minHeight="64dp"
                android:paddingLeft="10dp"
                android:textAppearance="?android:attr/textAppearanceLarge"
                android:visibility="visible" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:text="合计:"
                android:textSize="16sp"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/tv_total_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="￥0.00"
                android:textSize="16sp"
                android:textStyle="bold" />
        </LinearLayout>

        <TextView
            android:id="@+id/tv_delete"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:clickable="true"
            android:background="#a29e9e"
            android:gravity="center"
            android:text="删除"
            android:textColor="#FAFAFA" />

        <TextView
            android:id="@+id/tv_go_to_pay"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:background="#E24146"
            android:clickable="true"
            android:gravity="center"
            android:text="付款(0)"
            android:textColor="#FAFAFA" />
    </LinearLayout>
</LinearLayout>

条目的布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">


    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#CCCCCC" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <CheckBox
            android:id="@+id/check_box"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="4dp"
            android:checkMark="?android:attr/listChoiceIndicatorMultiple"
            android:gravity="center"
            android:minHeight="64dp"
            android:minWidth="32dp"
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:visibility="visible" />

        <ImageView
            android:id="@+id/iv_adapter_list_pic"
            android:layout_width="85dp"
            android:layout_height="85dp"
            android:layout_marginBottom="15dp"
            android:layout_marginTop="13dp"
            android:scaleType="centerCrop"
            android:src="@mipmap/ic_launcher"
             />

        <RelativeLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="13dp" >

            <TextView
                android:id="@+id/tv_goods_name"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginRight="10dp"
                android:layout_marginTop="20dp"
                android:ellipsize="end"
                android:maxLines="2"
                android:text="商品"
                android:textSize="14sp" />

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_marginBottom="30dp"
                android:orientation="horizontal" >

                <TextView
                    android:id="@+id/tv_goods_price"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:singleLine="true"
                    android:textSize="14sp"
                    android:textStyle="bold"
                    android:text="价格"/>

                <TextView
                    android:id="@+id/tv_type_size"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerVertical="true"
                    android:layout_marginLeft="10dp"
                    android:layout_toRightOf="@+id/tv_goods_price"
                    android:singleLine="true"
                    android:textSize="10sp"/>

                <LinearLayout
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_alignParentRight="true"
                    android:layout_centerVertical="true"
                    android:layout_marginRight="15dp"
                    android:orientation="horizontal" >

                    <TextView
                        android:id="@+id/tv_reduce"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:gravity="center"
                        android:background="#ccc"
                        android:text="一"
                        android:textSize="12sp" />

                    <TextView
                        android:id="@+id/tv_num"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:gravity="center"
                        android:singleLine="true"
                        android:text="1"
                        android:textSize="12sp" />

                    <TextView
                        android:id="@+id/tv_add"
                        android:layout_width="25dp"
                        android:layout_height="25dp"
                        android:gravity="center"
                        android:text="十"
                        android:background="#ccc"
                        android:textSize="12sp" />
                </LinearLayout>
            </RelativeLayout>
        </RelativeLayout>
    </LinearLayout>

</LinearLayout>

CartAdapter适配器

public class CaetAdapter extends BaseAdapter {

    private Context context;
    private List<HashMap<String, String>> list;
    private HashMap<String, Integer> pitchOnMap;

    public HashMap<String, Integer> getPitchOnMap() {
        return pitchOnMap;
    }

    public void setPitchOnMap(HashMap<String, Integer> pitchOnMap) {
        this.pitchOnMap = pitchOnMap;
    }

    public CaetAdapter(Context context, List<HashMap<String, String>> list) {
        this.context = context;
        this.list = list;

        pitchOnMap = new HashMap<>();
        for (int i = 0; i < list.size(); i++) {
            pitchOnMap.put(list.get(i).get("id"), 0);
        }
    }

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

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

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        convertView = View.inflate(context, R.layout.item_layout, null);
        final CheckBox checkBox;
        ImageView icon;
        final TextView name, price, num, type, reduce, add;

        checkBox = convertView.findViewById(R.id.check_box);
        icon = convertView.findViewById(R.id.iv_adapter_list_pic);
        name = convertView.findViewById(R.id.tv_goods_name);
        price = convertView.findViewById(R.id.tv_goods_price);
        type = convertView.findViewById(R.id.tv_type_size);
        num = convertView.findViewById(R.id.tv_num);
        reduce = convertView.findViewById(R.id.tv_reduce);
        add = convertView.findViewById(R.id.tv_add);

        name.setText(list.get(position).get("name"));
        price.setText("¥ " + (Integer.valueOf(list.get(position).get("price"))) * (Integer.valueOf(list.get(position).get("count"))));
        type.setText(list.get(position).get("type"));
        num.setText(list.get(position).get("count"));

        if(pitchOnMap.get(list.get(position).get("id"))== 0){
            checkBox.setChecked(false);
        }else{
            checkBox.setChecked(true);
        }

        checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(checkBox.isChecked()){
                    pitchOnMap.put(list.get(position).get("id"),1);
                }else{
                    pitchOnMap.put(list.get(position).get("id"), 0);
                }
                mrefreshPriceInterface.refreshPrice(pitchOnMap);
            }
        });

        //商品数量减
        reduce.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (Integer.valueOf(list.get(position).get("count")) <= 1) {
                    Toast.makeText(context, "数量不能再减啦,只能删除!", Toast.LENGTH_SHORT).show();
                } else {
                    list.get(position).put("count", (Integer.valueOf(list.get(position).get("count")) - 1) + "");
                    notifyDataSetChanged();
                }
                mrefreshPriceInterface.refreshPrice(pitchOnMap);
            }
        });
        //商品数量加
        add.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                list.get(position).put("count", (Integer.valueOf(list.get(position).get("count")) + 1) + "");
                notifyDataSetChanged();
                mrefreshPriceInterface.refreshPrice(pitchOnMap);

            }

        });

        return convertView;
    }

    /**
     * 创建接口
     */
    public interface RefreshPriceInterface {
        /**
         * 把价格展示到总价上
         * @param pitchOnMap
         */
        void refreshPrice(HashMap<String, Integer> pitchOnMap);
    }

    /**
     * 定义一个接口对象
     */
    private RefreshPriceInterface mrefreshPriceInterface;

    /**
     * 向外部暴露一个方法
     * 把价格展示到总价上
     * @param refreshPriceInterface
     */
    public void setRefreshPriceInterface(RefreshPriceInterface refreshPriceInterface) {
        mrefreshPriceInterface = refreshPriceInterface;
    }


}

MainActivity

public class MainActivity extends AppCompatActivity implements View.OnClickListener,CaetAdapter.RefreshPriceInterface{

    private LinearLayout top_bar;
    private ListView listview;
    private CheckBox all_chekbox;
    private TextView price;
    private TextView delete;
    private TextView tv_go_to_pay;

    private List<User> goodsList;
    private UserDao userDao;
    private List<HashMap<String,String>> listmap=new ArrayList<>();
    private CaetAdapter adapter;

    private double totalPrice = 0.00;
    private int totalCount = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {
        top_bar = (LinearLayout) findViewById(R.id.top_bar);
        listview = (ListView) findViewById(R.id.listview);
        all_chekbox = (CheckBox) findViewById(R.id.all_chekbox);
        price = (TextView) findViewById(R.id.tv_total_price);
        delete = (TextView) findViewById(R.id.tv_delete);
        tv_go_to_pay = (TextView) findViewById(R.id.tv_go_to_pay);

        all_chekbox.setOnClickListener(this);
        delete.setOnClickListener(this);
        tv_go_to_pay.setOnClickListener(this);

        initDate();
        adapter = new CaetAdapter(MainActivity.this, listmap);
        listview.setAdapter(adapter);
        adapter.setRefreshPriceInterface(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.all_chekbox:
                AllTheSelected();
                break;
            case R.id.tv_delete:
                checkDelete(adapter.getPitchOnMap());
                break;
            case R.id.tv_go_to_pay:
                if(totalCount<=0){
                    Toast.makeText(this,"请选择要付款的商品~",Toast.LENGTH_SHORT).show();
                }else{
                    Toast.makeText(this,"付款成功",Toast.LENGTH_SHORT).show();
                }
                break;
        }
    }
    /**
     * 数据
     */
    private void initDate() {
        //创建集合
        goodsList = new ArrayList<>();
        //数据库
        userDao = Myapplication.getInstances().getDaoSession().getUserDao();
        userDao.deleteAll();
        //数据源
        for (int i = 0; i < 10; i++) {
            //向数据库存放数据
            User user = new User((long) i,
                    "购物车里的第" + (i + 1) + "件商品",
                    (i + 20) + "码",
                    "10",
                    "10");
            userDao.insert(user);
        }
        //从数据库中把数据放到集合中
        goodsList=userDao.loadAll();
        //把结合中的数据放到HashMap集合中
        for(int i=0;i<goodsList.size();i++){
            HashMap<String,String> map=new HashMap<>();
            map.put("id",goodsList.get(i).getId()+"");
            map.put("name",goodsList.get(i).getName());
            map.put("type",(goodsList.get(i).getType()));
            map.put("price",goodsList.get(i).getPrice()+"");
            map.put("count",goodsList.get(i).getCount()+"");
            listmap.add(map);
        }
    }

    @Override
    public void refreshPrice(HashMap<String, Integer> pitchOnMap) {
        priceControl(pitchOnMap);
    }

    /**
     *  控制价格展示总价
     */
    private void priceControl(Map<String, Integer> pitchOnMap){
        totalCount = 0;
        totalPrice = 0.00;
        for(int i=0;i<listmap.size();i++){
            if(pitchOnMap.get(listmap.get(i).get("id"))==1){
                totalCount=totalCount+Integer.valueOf(listmap.get(i).get("count"));
                double goodsPrice=Integer.valueOf(listmap.get(i).get("count"))*Double.valueOf(listmap.get(i).get("price"));
                totalPrice=totalPrice+goodsPrice;
            }
        }
        price.setText(" ¥ "+totalPrice);
        tv_go_to_pay.setText("付款("+totalCount+")");
    }

    /**
     *  删除  控制价格展示总价
     * @param map
     */
    private void checkDelete(Map<String,Integer> map){
        List<HashMap<String,String>> waitDeleteList=new ArrayList<>();
        Map<String,Integer> waitDeleteMap =new HashMap<>();
        for(int i=0;i<listmap.size();i++){
            if(map.get(listmap.get(i).get("id"))==1){
                waitDeleteList.add(listmap.get(i));
                waitDeleteMap.put(listmap.get(i).get("id"),map.get(listmap.get(i).get("id")));
            }
    }
        listmap.removeAll(waitDeleteList);
        map.remove(waitDeleteMap);
        priceControl(map);
        adapter.notifyDataSetChanged();
    }
    /**
     *全选或反选
     */
    private void AllTheSelected(){
        HashMap<String,Integer> map=adapter.getPitchOnMap();
        boolean isCheck=false;
        boolean isUnCheck=false;
        Iterator iter = map.entrySet().iterator();
        while (iter.hasNext()) {
            Map.Entry entry = (Map.Entry) iter.next();

            if(Integer.valueOf(entry.getValue().toString())==1){
                isCheck=true;
            }else{
               isUnCheck=true;
            }
        }
        if(isCheck==true&&isUnCheck==false){//已经全选,做反选
            for(int i=0;i<listmap.size();i++){
                map.put(listmap.get(i).get("id"),0);
            }
            all_chekbox.setChecked(false);
        }else if(isCheck==true && isUnCheck==true){//部分选择,做全选
            for(int i=0;i<listmap.size();i++){
                map.put(listmap.get(i).get("id"),1);
            }
            all_chekbox.setChecked(true);
        }else if(isCheck==false && isUnCheck==true){//一个没选,做全选
            for(int i=0;i<listmap.size();i++){
                map.put(listmap.get(i).get("id"),1);
            }
            all_chekbox.setChecked(true);
        }
        priceControl(map);
        adapter.setPitchOnMap(map);
        adapter.notifyDataSetChanged();
    }

}


猜你喜欢

转载自blog.csdn.net/qpdb19981023/article/details/80848088
今日推荐
周排行
深度学习------Lingvo框架下的加速通道GPipe
webjars管理静态资源
C专家编程_2.2
mysql 源码安装
json文件操作
123231432
注解的实现
Spring MVC 控制器
《人月神话》读后感二
C#使用HttpWebRequest和HttpWebResponse上传文件示例
每日归档
更多
2024-09-08(0)
2024-09-07(0)
2024-09-06(0)
2024-09-05(0)
2024-09-04(0)
2024-09-03(0)
2024-09-02(0)
2024-09-01(0)
2024-08-31(0)
2024-08-30(0)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022