1、概要

總有學生要解決 購物車物品結算問題，下面給出了一個簡單的實現：

1.1、購物車中的物品可以修改數量

1.2、購物車中的物品可以選擇支付【并不對全部物品支付】

1.3、需支付的物品總價，需要顯示，并在用戶修改商品時，實時修改！

2、預覽圖效果

3、MainActivity代碼

需要事先準備幾個 充當商品的 圖片！

package edu.freshen.shopcat;import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;import android.os.Bundle; import android.app.Activity; import android.util.Log; import android.view.Menu; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.CheckBox; import android.widget.ListView; import android.widget.TextView;public class MainActivity extends Activity implements OnItemClickListener {//List<Map<String,Object>>data =new ArrayList(); //List<Map<String,Object>> cdata =new ArrayList();//ListView lv;TextView tv;Button bt;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);lv=(ListView) findViewById(R.id.listView1);tv=(TextView) findViewById(R.id.totalPrice);bt=(Button) findViewById(R.id.payBt);initData();initLv();}private void initLv() {ShopAdapter sa = new ShopAdapter(this, data, R.layout.listview_item);lv.setAdapter(sa);lv.setOnItemClickListener(this);}private void initData() {for (int i = 0; i <4; i++) {Map<String,Object> item =new HashMap();item.put("id", i);item.put("img", R.drawable.item1+i);item.put("name","物品"+i);item.put("price", 10f+5*i);item.put("count", 1);data.add(item);}}@Overridepublic void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {Map item = data.get(arg2);Log.i("Msg", "arg0="+arg0.getClass() +" ,arg1="+arg1.getClass());CheckBox box =(CheckBox) arg1.findViewById(R.id.lv_item_check);if(cdata.contains(item)){cdata.remove(item);box.setChecked(false);}else{cdata.add(item);box.setChecked(true);}sumPrice();}public void sumPrice(){float sum=0;for(Map<String,Object>item : cdata){sum+=(Float)item.get("price")*(Integer)item.get("count");}tv.setText("總價：￥ "+sum);} }

4、MainActivity布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".MainActivity" ><ListViewandroid:id="@+id/listView1"android:layout_width="match_parent"android:layout_height="match_parent"android:layout_marginBottom="55dp"></ListView><LinearLayoutandroid:layout_width="match_parent"android:layout_height="50dp"android:layout_marginTop="5dp"android:layout_alignParentBottom="true"android:background="#DDDDDD"><TextViewandroid:id="@+id/totalPrice"android:layout_width="0dp"android:layout_height="wrap_content"android:layout_weight="1"android:text="總價：" /><Buttonandroid:id="@+id/payBt"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="前往支付"/></LinearLayout></RelativeLayout>

5、ListView元素布局文件

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:descendantFocusability="blocksDescendants"><CheckBox android:id="@+id/lv_item_check"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_centerVertical="true"android:clickable="false"/><ImageViewandroid:id="@+id/lv_item_img"android:layout_width="80dp"android:layout_height="80dp"android:layout_centerVertical="true"android:layout_toRightOf="@id/lv_item_check"android:src="@drawable/item1" /><TextViewandroid:id="@+id/lv_item_name"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:layout_toRightOf="@+id/lv_item_img"android:layout_alignTop="@id/lv_item_img"android:text="精品頑石"android:textAppearance="?android:attr/textAppearanceMedium" /><TextViewandroid:id="@+id/lv_item_price"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_alignLeft="@id/lv_item_name"android:layout_below="@id/lv_item_name"android:layout_marginTop="5dp"android:text="￥30"android:textAppearance="?android:attr/textAppearanceSmall" /><Button android:id="@+id/lv_item_add"style="?android:attr/buttonStyleSmall"android:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginTop="20dp"android:layout_alignParentRight="true"android:layout_centerVertical="true"android:padding="2dp"android:text="+" /><EditTextandroid:id="@+id/lv_item_txt"android:layout_width="40dp"android:layout_height="wrap_content"android:layout_toLeftOf="@id/lv_item_add"android:layout_alignBottom="@id/lv_item_add"android:ems="10"android:inputType="number" /><Buttonandroid:id="@+id/lv_item_min"style="?android:attr/buttonStyleSmall"android:layout_width="wrap_content"android:layout_height="wrap_content"android:padding="2dp"android:layout_alignBottom="@id/lv_item_add"android:layout_toLeftOf="@id/lv_item_txt"android:text="-" /></RelativeLayout>

6、ListView適配器

package edu.freshen.shopcat;import java.util.List; import java.util.Map;import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.TextView;public class ShopAdapter extends BaseAdapter {private MainActivity activity;private List<Map<String,Object>>data;private int layout;public ShopAdapter(MainActivity activity, List<Map<String, Object>> data,int layout) {super();this.activity = activity;this.data = data;this.layout = layout;}@Overridepublic int getCount() {// TODO Auto-generated method stubreturn data.size();}@Overridepublic Object getItem(int arg0) {// TODO Auto-generated method stubreturn data.get(arg0);}@Overridepublic long getItemId(int arg0) {// TODO Auto-generated method stubreturn arg0;}@Overridepublic View getView(int arg0, View arg1, ViewGroup arg2) {final Map<String,Object> item = data.get(arg0);View v =LayoutInflater.from(activity).inflate(layout, null);ImageView iv=(ImageView) v.findViewById(R.id.lv_item_img);iv.setImageResource((Integer) item.get("img"));TextView name =(TextView) v.findViewById(R.id.lv_item_name);name.setText(item.get("name").toString());TextView price =(TextView) v.findViewById(R.id.lv_item_price);price.setText("￥ "+item.get("price").toString());Button addBt= (Button) v.findViewById(R.id.lv_item_add);Button minBt= (Button) v.findViewById(R.id.lv_item_min);final EditText et =(EditText) v.findViewById(R.id.lv_item_txt);et.setText(item.get("count").toString());addBt.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {item.put("count", (Integer)item.get("count")+1);et.setText(item.get("count").toString());activity.sumPrice();}});minBt.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {Integer ct = (Integer)item.get("count")-1;if(ct<=0)ct=0;item.put("count", ct);et.setText(ct.toString());activity.sumPrice();}});return v;}}

總結

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