Android开发实现简单购物车功能

释放双眼,带上耳机,听听看~!

 

MainActivity布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<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:button="@drawable/check_box_bg"
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:textColor="@color/purple"
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:background="@color/orange"
android:clickable="true"
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>
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
public class MainActivity extends AppCompatActivity implements CartAdapter.RefreshPriceInterface ,View.OnClickListener{
private ListView listView;
private CheckBox cb_check_all;
private TextView tv_total_price;
private TextView tv_delete;
private TextView tv_go_to_pay;
private CartAdapter adapter;
private double totalPrice = 0.00;
private int totalCount = 0;
private List<HashMap<String,String>> goodsList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initDate();
}
//控制价格展示
private void priceControl(Map<String, Integer> pitchOnMap){
totalCount = 0;
totalPrice = 0.00;
for(int i=0;i<goodsList.size();i++){
if(pitchOnMap.get(goodsList.get(i).get("id"))==1){
totalCount=totalCount+Integer.valueOf(goodsList.get(i).get("count"));
double goodsPrice=Integer.valueOf(goodsList.get(i).get("count"))*Double.valueOf(goodsList.get(i).get("price"));
totalPrice=totalPrice+goodsPrice;
}
}
tv_total_price.setText("¥ "+totalPrice);
tv_go_to_pay.setText("付款("+totalCount+")");
}
@Override
public void refreshPrice(Map<String, Integer> pitchOnMap) {
priceControl(pitchOnMap);
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.all_chekbox:
AllTheSelected();
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();
return;
}
Toast.makeText(this,"钱就是另一回事了~",Toast.LENGTH_SHORT).show();
break;
case R.id.tv_delete:
if(totalCount<=0){
Toast.makeText(this,"请选择要删除的商品~",Toast.LENGTH_SHORT).show();
return;
}
checkDelete(adapter.getPitchOnMap());
break;
}
}
//删除操作
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<goodsList.size();i++){
if(map.get(goodsList.get(i).get("id"))==1){
waitDeleteList.add(goodsList.get(i));
waitDeleteMap.put(goodsList.get(i).get("id"),map.get(goodsList.get(i).get("id")));
}
}
goodsList.removeAll(waitDeleteList);
map.remove(waitDeleteMap);
priceControl(map);
adapter.notifyDataSetChanged();
}
//全选或反选
private void AllTheSelected(){
Map<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<goodsList.size();i++){
map.put(goodsList.get(i).get("id"),0);
}
cb_check_all.setChecked(false);
}else if(isCheck==true && isUnCheck==true){//部分选择,做全选
for(int i=0;i<goodsList.size();i++){
map.put(goodsList.get(i).get("id"),1);
}
cb_check_all.setChecked(true);
}else if(isCheck==false && isUnCheck==true){//一个没选,做全选
for(int i=0;i<goodsList.size();i++){
map.put(goodsList.get(i).get("id"),1);
}
cb_check_all.setChecked(true);
}
priceControl(map);
adapter.setPitchOnMap(map);
adapter.notifyDataSetChanged();
}
private void initView(){
listView = (ListView) findViewById(R.id.listview);
cb_check_all = (CheckBox) findViewById(R.id.all_chekbox);
tv_total_price = (TextView) findViewById(R.id.tv_total_price);
tv_delete = (TextView) findViewById(R.id.tv_delete);
tv_go_to_pay = (TextView) findViewById(R.id.tv_go_to_pay);
tv_go_to_pay.setOnClickListener(this);
tv_delete.setOnClickListener(this);
cb_check_all.setOnClickListener(this);
adapter=new CartAdapter(this,goodsList);
adapter.setRefreshPriceInterface(this);
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
private void initDate(){
goodsList=new ArrayList<>();
for(int i=0;i<10;i++){
HashMap<String,String> map=new HashMap<>();
map.put("id",(new Random().nextInt(10000)%(10000-2900+2900) + 2900)+"");
map.put("name","购物车里的第"+(i+1)+"件商品");
map.put("type",(i+20)+"码");
map.put("price",(new Random().nextInt(100)%(100-29+29) + 29)+"");
map.put("count",(new Random().nextInt(10)%(10-1+1) + 1)+"");
goodsList.add(map);
}
initView();
}
}

CartAdapter布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
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:background="@color/page_backgroup"
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:button="@drawable/check_box_bg"
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="https://js.aizhan.com/develop/android/@mipmap/good_icon" />
<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:textColor="@color/grey_color1"
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:textColor="@color/orange_color"
android:textSize="14sp"
android:textStyle="bold" />
<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:textColor="@color/grey_color3"
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:background="@drawable/text_angle_gray"
android:gravity="center"
android:text="一"
android:textColor="@color/grey_color1"
android:textSize="12sp" />
<TextView
android:id="@+id/tv_num"
android:layout_width="25dp"
android:layout_height="25dp"
android:background="@drawable/text_angle"
android:gravity="center"
android:singleLine="true"
android:text="1"
android:textColor="@color/grey_color1"
android:textSize="12sp" />
<TextView
android:id="@+id/tv_add"
android:layout_width="25dp"
android:layout_height="25dp"
android:background="@drawable/text_angle_right"
android:gravity="center"
android:text="+"
android:textColor="@color/grey_color1"
android:textSize="12sp" />
</LinearLayout>
</RelativeLayout>
</RelativeLayout>
</LinearLayout>
</LinearLayout>
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Created by lipeng
* 2017/6/5.
*/
public class CartAdapter extends BaseAdapter {
private Context context;
private List<HashMap<String,String>> dataList;
private ViewHolder vh;
private Map<String,Integer> pitchOnMap;
private RefreshPriceInterface refreshPriceInterface;
public CartAdapter(Context context, List<HashMap<String,String>> list){
this.context=context;
this.dataList=list;
pitchOnMap=new HashMap<>();
for(int i=0;i<dataList.size();i++){
pitchOnMap.put(dataList.get(i).get("id"),0);
}
}
@Override
public View getView(final int position, View view, ViewGroup viewGroup) {
vh=new ViewHolder();
if(view==null){
view= LayoutInflater.from(context).inflate(R.layout.item_layout,null);
vh.checkBox=(CheckBox)view.findViewById(R.id.check_box);
vh.icon=(ImageView)view.findViewById(R.id.iv_adapter_list_pic);
vh.name=(TextView)view.findViewById(R.id.tv_goods_name);
vh.price=(TextView)view.findViewById(R.id.tv_goods_price);
vh.type=(TextView)view.findViewById(R.id.tv_type_size);
vh.num=(TextView)view.findViewById(R.id.tv_num);
vh.reduce=(TextView)view.findViewById(R.id.tv_reduce);
vh.add=(TextView)view.findViewById(R.id.tv_add);
view.setTag(vh);
}else {
vh=(ViewHolder)view.getTag();
}
if(dataList.size()>0){
if(pitchOnMap.get(dataList.get(position).get("id"))==0)vh.checkBox.setChecked(false);
else vh.checkBox.setChecked(true);
HashMap<String,String> map=dataList.get(position);
vh.name.setText(map.get("name"));
vh.num.setText(map.get("count"));
vh.type.setText(map.get("type"));
vh.price.setText("¥ "+(Double.valueOf(map.get("price")) * Integer.valueOf(map.get("count"))));
vh.checkBox.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final int index=position;
if(((CheckBox)view).isChecked())pitchOnMap.put(dataList.get(index).get("id"),1);else pitchOnMap.put(dataList.get(index).get("id"),0);
refreshPriceInterface.refreshPrice(pitchOnMap);
}
});
vh.reduce.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final int index=position;
dataList.get(index).put("count",(Integer.valueOf(dataList.get(index).get("count"))-1)+"");
if(Integer.valueOf(dataList.get(index).get("count"))<=0){
//可提示是否删除该商品,确定就remove,否则就保留1
String deID=dataList.get(index).get("id");
dataList.remove(index);
pitchOnMap.remove(deID);
}
notifyDataSetChanged();
refreshPriceInterface.refreshPrice(pitchOnMap);
}
});
vh.add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
final int index=position;
dataList.get(index).put("count",(Integer.valueOf(dataList.get(index).get("count"))+1)+"");
if(Integer.valueOf(dataList.get(index).get("count"))>15){
//15为库存可选择上限
Toast.makeText(context,"已达库存上限~",Toast.LENGTH_SHORT).show();
return;
}
notifyDataSetChanged();
refreshPriceInterface.refreshPrice(pitchOnMap);
}
});
}
return view;
}
public Map<String,Integer> getPitchOnMap(){
return pitchOnMap;
}
public void setPitchOnMap(Map<String,Integer> pitchOnMap){
this.pitchOnMap=new HashMap<>();
this.pitchOnMap.putAll(pitchOnMap);
}
public interface RefreshPriceInterface{
void refreshPrice(Map<String, Integer> pitchOnMap);
}
public void setRefreshPriceInterface(RefreshPriceInterface refreshPriceInterface){
this.refreshPriceInterface=refreshPriceInterface;
}
@Override
public Object getItem(int i) {
return null;
}
@Override
public long getItemId(int i) {
return 0;
}
@Override
public int getCount() {
if (dataList != null) {
return dataList.size();
} else {
return 0;
}
}
class ViewHolder{
CheckBox checkBox;
ImageView icon;
TextView name,price,num,type,reduce,add;
}
}

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