购物车的实现案例
来源：互联网 发布：vb中left是什么意思 编辑：程序博客网 时间：2024/05/22 10:46
首先写上框架
package com.example.mr.yuekaomoni;import android.annotation.SuppressLint;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.CheckBox;import android.widget.LinearLayout;import android.widget.TextView;import com.example.mr.yuekaomoni.bean.Goubean;import com.example.mr.yuekaomoni.bean.Pricebean;import com.example.mr.yuekaomoni.utils.Gouwucard;import com.example.mr.yuekaomoni.utils.OkUrl;import com.google.gson.Gson;import java.io.IOException;import java.util.ArrayList;import java.util.List;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;public class GouwuActivity extends AppCompatActivity { private LinearLayout cang; private Gouwucard card; private CheckBox xuan; private TextView heji; private TextView jiesuan; private List<Goubean.DataBean> data; private List<List<Goubean.DataBean.ListBean>> list; @SuppressLint("HandlerLeak") Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); if(msg.what==0){ Pricebean pricebean = (Pricebean) msg.obj; heji.setText("合计:￥"+pricebean.getPrice()); jiesuan.setText("去结算("+pricebean.getCount()+")"); }else if(msg.what==55){ info(); } } }; private LinearLayout linearLayout; private GouAdapter gouAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_gouwu); cang = findViewById(R.id.cang); card= findViewById(R.id.card); xuan = findViewById(R.id.quanxuan); heji = findViewById(R.id.heji); jiesuan = findViewById(R.id.jiesuan); linearLayout = findViewById(R.id.linear_layout); xuan.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { gouAdapter.quanxuan(xuan.isChecked()); } }); card.setGroupIndicator(null); } @Override protected void onResume() { super.onResume(); info(); } private void info() { OkUrl.doget("https://www.zhaoapi.cn/product/getCarts?uid=2834", new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); } @Override public void onResponse(Call call, final Response response) throws IOException { if(response.isSuccessful()){ final String string = response.body().string(); runOnUiThread(new Runnable() { @Override public void run() { try { Log.e("----", "run: "+string ); //判断是否为空 if(!string.equals("null")){ //隐藏 cang.setVisibility(View.GONE); Gson gson = new Gson(); Goubean goubean = gson.fromJson(string, Goubean.class); data = goubean.getData(); //创建子集合 list = new ArrayList<>(); for (int i=0;i<data.size();i++){ list.add(data.get(i).getList()); } //循环二级列表判断是否选改变一级状态 for(int i=0;i<data.size();i++){ if(ischilserstate(i)){ data.get(i).setIscheck(true); } } //全选根据一级全部选中所选中 xuan.setChecked(isgroupstate()); //创建适配器 gouAdapter = new GouAdapter(data, list, handler, GouwuActivity.this); card.setAdapter(gouAdapter); //展示所有 for(int i=0;i<data.size();i++){ card.expandGroup(i); } gouAdapter.sendpriceanfcount(); }else{ linearLayout.setVisibility(View.GONE); } } catch (Exception e) { e.printStackTrace(); } } }); } } }); } //判断二级是否全选 private boolean ischilserstate(int i) { for(int j=0;j<data.get(i).getList().size();j++){ if(data.get(i).getList().get(j).getSelected()==0){ return false; } } return true; } //判断一级是否全部选中 private Boolean isgroupstate(){ for(int i=0;i<data.size();i++){ if(!data.get(i).isIscheck()){ return false; } } return true; }}
适配器的编写方式
package com.example.mr.yuekaomoni;import android.content.Context;import android.icu.util.Measure;import android.os.Handler;import android.os.Message;import android.view.View;import android.view.ViewGroup;import android.widget.BaseExpandableListAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.TextView;import com.example.mr.yuekaomoni.bean.Goubean;import com.example.mr.yuekaomoni.bean.Pricebean;import com.example.mr.yuekaomoni.utils.ImagBase;import com.example.mr.yuekaomoni.utils.OkUrl;import com.nostra13.universalimageloader.core.ImageLoader;import java.io.IOException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import okhttp3.Call;import okhttp3.Callback;import okhttp3.Response;/** * Created by Mr赵 on 2017/12/20. */class GouAdapter extends BaseExpandableListAdapter { private List<Goubean.DataBean> data; private List<List<Goubean.DataBean.ListBean>> list; Handler handler; Context ctx; private int index; private int size; private int chidesize; private int childindex; public GouAdapter(List<Goubean.DataBean> data, List<List<Goubean.DataBean.ListBean>> list, Handler handler, Context ctx) { this.data = data; this.list = list; this.handler = handler; this.ctx = ctx; } @Override public int getGroupCount() { return data.size(); } @Override public int getChildrenCount(int i) { return list.get(i).size(); } @Override public Object getGroup(int i) { return data.get(i); } @Override public Object getChild(int i, int i1) { return data.get(i).getList().get(i1); } @Override public long getGroupId(int i) { return i; } @Override public long getChildId(int i, int i1) { return i1; } @Override public boolean hasStableIds() { return true; } @Override public boolean isChildSelectable(int i, int i1) { return true; } /* * 一级 * */ @Override public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) { final Groupholder gh; if(view==null){ gh=new Groupholder(); view=View.inflate(ctx, R.layout.yijibuju,null); gh.yiji_check=view.findViewById(R.id.yiji_check); gh.text_yiji=view.findViewById(R.id.text_yiji); view.setTag(gh); }else{ gh= (Groupholder) view.getTag(); } gh.text_yiji.setText(data.get(i).getSellerName()); gh.yiji_check.setChecked(data.get(i).isIscheck()); //点击一级状态改变耳机状态 gh.yiji_check.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { //获取此组中所有自条目 chidesize = data.get(i).getList().size(); childindex = 0; updataAllInGroup(gh.yiji_check.isChecked(),data.get(i)); } }); return view; } private void updataAllInGroup(final boolean checked, final Goubean.DataBean dataBean) { Goubean.DataBean.ListBean listBean = dataBean.getList().get(childindex); //?uid=71&sellerid=1&pid=1&selected=0&num=10 Map<String, String> params=new HashMap<>(); params.put("uid","2834"); params.put("sellerid", String.valueOf(listBean.getSellerid())); params.put("pid", String.valueOf(listBean.getPid())); params.put("selected", String.valueOf(checked?1:0)); params.put("num", String.valueOf(listBean.getNum())); OkUrl.doPost("https://www.zhaoapi.cn/product/updateCarts", params, new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if(response.isSuccessful()){ index=index+1; if(index<size){ updataAllInGroup(checked,dataBean); }else { Message obtain = Message.obtain(); obtain.what=55; handler.sendMessage(obtain); } } } }); } /* * 二级 * */ @Override public View getChildView(int i, int i1, boolean b, View view, ViewGroup viewGroup) { Childholder ch; if(view==null){ ch=new Childholder(); view=View.inflate(ctx,R.layout.erjibuju,null); ch.erji_check=view.findViewById(R.id.erji_check); ch.erji_img=view.findViewById(R.id.erji_img); ch.erji_tel=view.findViewById(R.id.erji_tel); ch.erji_price=view.findViewById(R.id.erji_price); ch.shan=view.findViewById(R.id.shan); ch.text_jia=view.findViewById(R.id.text_add); ch.text_num=view.findViewById(R.id.text_num); ch.text_jian=view.findViewById(R.id.text_jian); view.setTag(ch); }else{ ch= (Childholder) view.getTag(); } final Goubean.DataBean.ListBean listBean = data.get(i).getList().get(i1); //复制 ch.erji_check.setChecked(listBean.getSelected()==0?false:true); String[] split = listBean.getImages().split("\\|"); ImageLoader.getInstance().displayImage(split[0],ch.erji_img,ImagBase.getDefaultOption()); ch.erji_tel.setText(listBean.getTitle()); ch.erji_price.setText("￥:"+listBean.getBargainPrice()); ch.text_num.setText(listBean.getNum()+""); //二级列表点击事件 ch.erji_check.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { updatachild(listBean); } }); ch.text_jia.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { upallNum(listBean,true); } }); ch.text_jian.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(listBean.getNum()==1){ return; } upallNum(listBean,false); } }); return view; } private void upallNum(Goubean.DataBean.ListBean listBean, boolean b) { //?uid=71&sellerid=1&pid=1&selected=0&num=10 Map<String, String> params=new HashMap<>(); params.put("uid","2834"); params.put("sellerid", String.valueOf(listBean.getSellerid())); params.put("pid", String.valueOf(listBean.getPid())); params.put("selected", String.valueOf(listBean.getSelected())); if(b){ params.put("num", String.valueOf(listBean.getNum()+1)); }else{ params.put("num", String.valueOf(listBean.getNum()-1)); } OkUrl.doPost("https://www.zhaoapi.cn/product/updateCarts", params, new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if(response.isSuccessful()){ Message obtain = Message.obtain(); obtain.what=55; handler.sendMessage(obtain); } } }); } private void updatachild(Goubean.DataBean.ListBean listBean) { //?uid=71&sellerid=1&pid=1&selected=0&num=10 Map<String, String> params=new HashMap<>(); params.put("uid","2834"); params.put("sellerid", String.valueOf(listBean.getSellerid())); params.put("pid", String.valueOf(listBean.getPid())); params.put("selected", String.valueOf(listBean.getSelected()==0?1:0)); params.put("num", String.valueOf(listBean.getNum())); OkUrl.doPost("https://www.zhaoapi.cn/product/updateCarts", params, new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if(response.isSuccessful()){ }else { Message obtain = Message.obtain(); obtain.what=55; handler.sendMessage(obtain); } } }); } /* * 点击全选改变所有状态 * */ public void quanxuan(boolean checkee){ List<Goubean.DataBean.ListBean> liss=new ArrayList<>(); for (int i=0;i<data.size();i++){ for(int j=0;j<data.get(i).getList().size();j++){ liss.add(data.get(i).getList().get(j)); } } size = liss.size(); index=0; //通过递归更新自条目的选中 updateAllchilde(liss,checkee); } private void updateAllchilde(final List<Goubean.DataBean.ListBean> liss, final boolean checkee) { Goubean.DataBean.ListBean listBean = liss.get(index); //?uid=71&sellerid=1&pid=1&selected=0&num=10 Map<String, String> params=new HashMap<>(); params.put("uid","2834"); params.put("sellerid", String.valueOf(listBean.getSellerid())); params.put("pid", String.valueOf(listBean.getPid())); params.put("selected", String.valueOf(checkee?1:0)); params.put("num", String.valueOf(listBean.getNum())); OkUrl.doPost("https://www.zhaoapi.cn/product/updateCarts", params, new Callback() { @Override public void onFailure(Call call, IOException e) { } @Override public void onResponse(Call call, Response response) throws IOException { if(response.isSuccessful()){ index=index+1; if(index<size){ updateAllchilde(liss,checkee); }else { Message obtain = Message.obtain(); obtain.what=55; handler.sendMessage(obtain); } } } }); } /* * 计算金钱 **/ public void sendpriceanfcount(){ double price=0; int count=0; for(int i=0;i<data.size();i++){ for(int j=0;j<data.get(i).getList().size();j++){ if(data.get(i).getList().get(j).getSelected()==1){ price+=data.get(i).getList().get(j).getBargainPrice()*data.get(i).getList().get(j).getNum(); count+=data.get(i).getList().get(j).getNum(); } } } Pricebean pricebean = new Pricebean(price, count); Message obtain = Message.obtain(); obtain.what=0; obtain.obj=pricebean; handler.sendMessage(obtain); } //优化 class Groupholder{ CheckBox yiji_check; TextView text_yiji; } class Childholder{ CheckBox erji_check; ImageView erji_img; TextView erji_tel; TextView erji_price; Button shan; TextView text_jian; TextView text_jia; TextView text_num; }}
编写首页布局
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="#fff" android:layout_height="match_parent"> <!--标题--> <LinearLayout android:layout_alignParentTop="true" android:id="@+id/biaoti" android:padding="20dp" android:orientation="horizontal" android:gravity="center" android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:text="购物车" android:textSize="25dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <ImageView android:background="@drawable/goubiao" android:layout_width="20dp" android:layout_height="20dp" /> </LinearLayout> <!--线--> <TextView android:id="@+id/xian" android:layout_below="@+id/biaoti" android:background="#e4e2e2" android:layout_width="match_parent" android:layout_height="2dp" /> <!--登录--> <LinearLayout android:id="@+id/cang1" android:layout_below="@+id/xian" android:visibility="visible" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="wrap_content"> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content"> <Button android:id="@+id/deng" android:text="登录" android:layout_marginLeft="20dp" android:layout_marginRight="10dp" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="登陆后同步电脑与手机购物车中的商品" /> </LinearLayout> <TextView android:id="@+id/xian2" android:visibility="visible" android:background="#e4e2e2" android:layout_width="match_parent" android:layout_height="2dp" /> </LinearLayout><!--存放是否为空--> <FrameLayout android:id="@+id/frame" android:visibility="visible" android:layout_below="@+id/cang1" android:layout_width="match_parent" android:layout_height="wrap_content"></FrameLayout><ScrollView android:layout_below="@+id/cang1" android:layout_above="@+id/linear_layout" android:layout_width="match_parent" android:layout_height="wrap_content"> <com.example.mr.zongheyemian.activitty.Goucarderjiliebiao android:id="@+id/goucard" android:layout_width="match_parent" android:layout_height="wrap_content"> > </com.example.mr.zongheyemian.activitty.Goucarderjiliebiao></ScrollView> <!--底部结算--> <LinearLayout android:id="@+id/linear_layout" android:layout_alignParentBottom="true" android:gravity="center_vertical" android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="50dp"> <CheckBox android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:button="@null" android:background="@drawable/check_box_selector" android:id="@+id/quanxuan" android:layout_width="25dp" android:layout_height="25dp" /> <TextView android:id="@+id/heji" android:text="合计:¥0.00" android:layout_weight="2" android:layout_width="0dp" android:layout_height="wrap_content" /> <TextView android:text="去结算(0)" android:background="#ff0000" android:textColor="#ffffff" android:gravity="center" android:id="@+id/jiesuan" android:layout_width="0dp" android:layout_weight="1" android:layout_height="match_parent" /> </LinearLayout></RelativeLayout>
编写一级布局
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:gravity="center_vertical" android:padding="10dp" android:layout_height="match_parent"> <CheckBox android:button="@null" android:id="@+id/check_yiji" android:background="@drawable/check_box_selector" android:layout_width="25dp" android:layout_height="25dp" /> <TextView android:layout_marginLeft="10dp" android:text="京东自营" android:id="@+id/text_yiji" android:layout_width="wrap_content" android:layout_height="wrap_content" /></LinearLayout>
编写二级布局
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:padding="10dp" android:layout_height="match_parent"> <CheckBox android:layout_centerVertical="true" android:id="@+id/check_erji" android:button="@null" android:background="@drawable/check_box_selector" android:layout_width="25dp" android:layout_height="25dp" /> <ImageView android:id="@+id/img_erji" android:layout_centerVertical="true" android:layout_toRightOf="@+id/check_erji" android:layout_marginLeft="10dp" android:layout_width="80dp" android:layout_height="80dp" /> <TextView android:id="@+id/title_erji" android:layout_toRightOf="@+id/img_erji" android:layout_marginLeft="10dp" android:layout_alignTop="@+id/img_erji" android:maxLines="2" android:minLines="2" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/price_erji" android:layout_toRightOf="@+id/img_erji" android:layout_marginLeft="10dp" android:layout_alignBottom="@+id/img_erji" android:text="¥0.00" android:textColor="#ff0000" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <LinearLayout android:layout_alignParentRight="true" android:layout_alignBottom="@+id/img_erji" android:orientation="horizontal" android:layout_width="wrap_content" android:layout_height="wrap_content"> <TextView android:id="@+id/text_jian" android:text="一" android:padding="5dp" android:background="@drawable/biangkuangxian" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:gravity="center" android:id="@+id/text_num" android:paddingLeft="10dp" android:paddingRight="10dp" android:text="1" android:background="@drawable/biangkuangxian" android:layout_width="wrap_content" android:layout_height="match_parent" /> <TextView android:id="@+id/text_add" android:text="十" android:padding="5dp" android:background="@drawable/biangkuangxian" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout></RelativeLayout>
当点击状态/非点击状态
<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android"> <item android:state_checked="true" android:drawable="@drawable/g1"/> <item android:state_checked="false" android:drawable="@drawable/g"/></selector>自定义card控件package com.example.mr.yuekaomoni.utils;import android.content.Context;import android.util.AttributeSet;import android.widget.ExpandableListView;/** * Created by Mr赵 on 2017/12/19. */public class Gouwucard extends ExpandableListView { public Gouwucard(Context context) { super(context); } public Gouwucard(Context context, AttributeSet attrs) { super(context, attrs); } public Gouwucard(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int i = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST); super.onMeasure(widthMeasureSpec, i); }}
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