andriod——二级列表完美实现购物车

adapter——Myadapter

public class MyAdapter extends BaseExpandableListAdapter {
private Context context;
private List<GoosBean.DataBean> groupList;
private List<List<GoosBean.DataBean.DatasBean>> childList;
private final LayoutInflater inflater;

public MyAdapter(Context context, List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList) {
this.context = context;
this.groupList = groupList;
this.childList = childList;
inflater = LayoutInflater.from(context);
}

@Override
public int getGroupCount() {
return groupList.size();
}

@Override
public int getChildrenCount(int groupPosition) {
return childList.get(groupPosition).size();
}

@Override
public Object getGroup(int groupPosition) {
return groupList.get(groupPosition);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
return childList.get(groupPosition).get(childPosition);
}

@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}

@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}

@Override
public boolean hasStableIds() {
return false;
}

@Override
public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
View view;
final GroupViewHolder holder;
if (convertView == null) {
holder = new GroupViewHolder();
view = inflater.inflate(R.layout.item_parent_market, null);
holder.cbGroup = view.findViewById(R.id.cb_parent);
holder.tv_number = view.findViewById(R.id.tv_number);
view.setTag(holder);
} else {
view = convertView;
holder = (GroupViewHolder) view.getTag();
}
final GoosBean.DataBean dataBean = groupList.get(groupPosition);
holder.cbGroup.setChecked(dataBean.isChecked());
holder.tv_number.setText(dataBean.getTitle());
//一级checkbox
holder.cbGroup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dataBean.setChecked(holder.cbGroup.isChecked());
changeChildCbState(groupPosition, holder.cbGroup.isChecked());
EventBus.getDefault().post(compute());
changeAllCbState(isAllGroupCbSelected());
notifyDataSetChanged();
}
});

return view;
}

@Override
public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
View view;
final ChildViewHolder holder;
if (convertView == null) {
holder = new ChildViewHolder();
view = inflater.inflate(R.layout.item_child_market, null);
holder.cbChild = view.findViewById(R.id.cb_child);
holder.tv_tel = view.findViewById(R.id.tv_del);
holder.tv_content = view.findViewById(R.id.tv_content);
holder.tv_time = view.findViewById(R.id.tv_time);
holder.tv_price = view.findViewById(R.id.tv_pri);
holder.tv_del = view.findViewById(R.id.tv_del);
holder.iv_add = view.findViewById(R.id.iv_add);
holder.iv_del = view.findViewById(R.id.iv_del);
holder.tv_num = view.findViewById(R.id.tv_num);
view.setTag(holder);
} else {
view = convertView;
holder = (ChildViewHolder) view.getTag();
}
final GoosBean.DataBean.DatasBean datasBean = childList.get(groupPosition).get(childPosition);
holder.cbChild.setChecked(datasBean.isChecked());
holder.tv_tel.setText(datasBean.getType_name());
holder.tv_content.setText(datasBean.getMsg());
holder.tv_time.setText(datasBean.getAdd_time());
holder.tv_price.setText(datasBean.getPrice() + "");
holder.tv_num.setText(datasBean.getNum() + "");

//二级checkbox
holder.cbChild.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//设置该条目对象里的checked属性值
datasBean.setChecked(holder.cbChild.isChecked());
PriceAndCountEvent priceAndCountEvent = compute();
EventBus.getDefault().post(priceAndCountEvent);

if (holder.cbChild.isChecked()) {
//当前checkbox是选中状态
if (isAllChildCbSelected(groupPosition)) {
changGroupCbState(groupPosition, true);
changeAllCbState(isAllGroupCbSelected());
}
} else {
changGroupCbState(groupPosition, false);
changeAllCbState(isAllGroupCbSelected());
}
notifyDataSetChanged();
}
});
//加号
holder.iv_add.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int num = datasBean.getNum();
holder.tv_num.setText(++num + "");
datasBean.setNum(num);
if (holder.cbChild.isChecked()) {
PriceAndCountEvent priceAndCountEvent = compute();
EventBus.getDefault().post(priceAndCountEvent);
}
}
});
//减号
holder.iv_del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int num = datasBean.getNum();
if (num == 1) {
return;
}
holder.tv_num.setText(--num + "");
datasBean.setNum(num);

cc62
if (holder.cbChild.isChecked()) {
PriceAndCountEvent priceAndCountEvent = compute();
EventBus.getDefault().post(priceAndCountEvent);
}
}
});
//删除
holder.tv_del.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
GoosBean.DataBean.DatasBean remove = datasBeen.remove(childPosition);
if (datasBeen.size() == 0) {
childList.remove(groupPosition);
groupList.remove(groupPosition);
}
EventBus.getDefault().post(compute());
notifyDataSetChanged();
}
});
return view;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}

class GroupViewHolder {
CheckBox cbGroup;
TextView tv_number;
}

class ChildViewHolder {
CheckBox cbChild;
TextView tv_tel;
TextView tv_content;
TextView tv_time;
TextView tv_price;
TextView tv_del;
ImageView iv_del;
ImageView iv_add;
TextView tv_num;
}

/**
* 改变全选的状态
*
* @param flag
*/
private void changeAllCbState(boolean flag) {
MessageEvent messageEvent = new MessageEvent();
messageEvent.setChecked(flag);
EventBus.getDefault().post(messageEvent);
}

/**
* 改变一级列表checkbox状态
*
* @param groupPosition
*/
private void changGroupCbState(int groupPosition, boolean flag) {
GoosBean.DataBean dataBean = groupList.get(groupPosition);
dataBean.setChecked(flag);
}

/**
* 改变二级列表checkbox状态
*
* @param groupPosition
* @param flag
*/
private void changeChildCbState(int groupPosition, boolean flag) {
List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
for (int i = 0; i < datasBeen.size(); i++) {
GoosBean.DataBean.DatasBean datasBean = datasBeen.get(i);
datasBean.setChecked(flag);
}
}

/**
* 判断一级列表是否全部选中
*
* @return
*/
private boolean isAllGroupCbSelected() {
for (int i = 0; i < groupList.size(); i++) {
GoosBean.DataBean dataBean = groupList.get(i);
if (!dataBean.isChecked()) {
return false;
}
}
return true;
}

/**
* 判断二级列表是否全部选中
*
* @param groupPosition
* @return
*/
private boolean isAllChildCbSelected(int groupPosition) {
List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(groupPosition);
for (int i = 0; i < datasBeen.size(); i++) {
GoosBean.DataBean.DatasBean datasBean = datasBeen.get(i);
if (!datasBean.isChecked()) {
return false;
}
}
return true;
}

/**
* 计算列表中，选中的钱和数量
*/
private PriceAndCountEvent compute() {
int count = 0;
int price = 0;
for (int i = 0; i < childList.size(); i++) {
List<GoosBean.DataBean.DatasBean> datasBeen = childList.get(i);
for (int j = 0; j < datasBeen.size(); j++) {
GoosBean.DataBean.DatasBean datasBean = datasBeen.get(j);
if (datasBean.isChecked()) {
price += datasBean.getNum() * datasBean.getPrice();
count += datasBean.getNum();
}
}
}
PriceAndCountEvent priceAndCountEvent = new PriceAndCountEvent();
priceAndCountEvent.setCount(count);
priceAndCountEvent.setPrice(price);
return priceAndCountEvent;
}

/**
* 设置全选、反选
*
* @param flag
*/
public void changeAllListCbState(boolean flag) {
for (int i = 0; i < groupList.size(); i++) {
changGroupCbState(i, flag);
changeChildCbState(i, flag);
}
EventBus.getDefault().post(compute());
notifyDataSetChanged();
}

}

bean——GoodsBeaneventbusevent——MessageEvent

public class MessageEvent {
private boolean checked;

public boolean isChecked() {
return checked;
}

public void setChecked(boolean checked) {
this.checked = checked;
}
}

eventbusevent——PriceAndCountEvent

public class PriceAndCountEvent {
private int price;
private int count;

public int getPrice() {
return price;
}

public void setPrice(int price) {
this.price = price;
}

public int getCount() {
return count;
}

public void setCount(int count) {
this.count = count;
}
}

mode——IMainModel

import com.example.gouwuche.bean.GoosBean;
import com.example.gouwuche.net.OnNetListener;

public interface IMainModel {
public void getGoods(OnNetListener<GoosBean> onNetListener);
}

mode——MainModel

public class MainModel implements IMainModel {private Handler handler = new Handler(Looper.getMainLooper());public void getGoods(final OnNetListener<GoosBean> onNetListener) {HttpUtils.getHttpUtils().doGet(Api.url, new Callback() {@Overridepublic void onFailure(Call call, IOException e) {}@Overridepublic void onResponse(Call call, Response response) throws IOException {String string = response.body().string();final GoosBean goosBean = new Gson().fromJson(string, GoosBean.class);handler.post(new Runnable() {@Overridepublic void run() {onNetListener.onSuccess(goosBean);}});}});}}

net——Api

public interface Api {public static final String url = "http://result.eolinker.com/iYXEPGn4e9c6dafce6e5cdd23287d2bb136ee7e9194d3e9?uri=evaluation";}

net——HttpUtils

import okhttp3.Callback;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.logging.HttpLoggingInterceptor;public class HttpUtils {private static volatile HttpUtils httpUtils;private final OkHttpClient client;private HttpUtils() {HttpLoggingInterceptor logging = new HttpLoggingInterceptor();logging.setLevel(HttpLoggingInterceptor.Level.BODY);client = new OkHttpClient.Builder().addInterceptor(logging).build();}public static HttpUtils getHttpUtils() {if (httpUtils == null) {synchronized (HttpUtils.class) {if (httpUtils == null) {httpUtils = new HttpUtils();}}}return httpUtils;}/*** GET请求** @param url* @param callback*/public void doGet(String url, Callback callback) {Request request = new Request.Builder().url(url).build();client.newCall(request).enqueue(callback);}}

net——OnNetListener

public interface OnNetListener<T> {public void onSuccess(T t);public void onFailure(Exception e);}

presenter——MainPresenter

import com.example.gouwuche.bean.GoosBean;import com.example.gouwuche.mode.IMainModel;import com.example.gouwuche.mode.MainModel;import com.example.gouwuche.net.OnNetListener;import com.example.gouwuche.view.IMainActivity;import java.util.ArrayList;import java.util.List;public class MainPresenter {private final IMainModel imainModel;private final IMainActivity iMainActivity;public MainPresenter(IMainActivity iMainActivity) {this.iMainActivity = iMainActivity;imainModel = new MainModel();}public void getGoods() {imainModel.getGoods(new OnNetListener<GoosBean>() {@Overridepublic void onSuccess(GoosBean goosBean) {//List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childListList<GoosBean.DataBean> dataBean = goosBean.getData();List<List<GoosBean.DataBean.DatasBean>> childList = new ArrayList<List<GoosBean.DataBean.DatasBean>>();for (int i = 0; i < dataBean.size(); i++) {List<GoosBean.DataBean.DatasBean> datas = dataBean.get(i).getDatas();childList.add(datas);}iMainActivity.showList(dataBean, childList);}@Overridepublic void onFailure(Exception e) {}});}}

view——IMainActivity

import com.example.gouwuche.bean.GoosBean;import java.util.List;public interface IMainActivity {public void showList(List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList);}

MainActivity

importandroid.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.CheckBox;import android.widget.ExpandableListView;import android.widget.TextView;import com.example.gouwuche.adapter.MyAdapter;import com.example.gouwuche.bean.GoosBean;import com.example.gouwuche.eventbusevent.MessageEvent;import com.example.gouwuche.eventbusevent.PriceAndCountEvent;import com.example.gouwuche.presenter.MainPresenter;import com.example.gouwuche.view.IMainActivity;import org.greenrobot.eventbus.EventBus;import org.greenrobot.eventbus.Subscribe;import java.util.List;

public class MainActivity extends AppCompatActivity implements IMainActivity {private ExpandableListView mElv;private CheckBox mCheckbox2;private TextView mTvPrice;private TextView mTvNum;private MyAdapter adapter;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);EventBus.getDefault().register(this);initView();new MainPresenter(this).getGoods();mCheckbox2.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {adapter.changeAllListCbState(mCheckbox2.isChecked());}});}@Overrideprotected void onDestroy() {super.onDestroy();EventBus.getDefault().unregister(this);}private void initView() {mElv = (ExpandableListView) findViewById(R.id.elv);mCheckbox2 = (CheckBox) findViewById(R.id.checkbox2);mTvPrice = (TextView) findViewById(R.id.tv_price);mTvNum = (TextView) findViewById(R.id.tv_num);}@Overridepublic void showList(List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList) {adapter = new MyAdapter(this, groupList, childList);mElv.setAdapter(adapter);mElv.setGroupIndicator(null);//默认让其全部展开for (int i = 0; i < groupList.size(); i++) {mElv.expandGroup(i);}}@Subscribepublic void onMessageEvent(MessageEvent event) {mCheckbox2.setChecked(event.isChecked());}@Subscribepublic void onMessageEvent(PriceAndCountEvent event) {mTvNum.setText("结算(" + event.getCount() + ")");mTvPrice.setText(event.getPrice() + "");}}

按钮效

:layout_width="wrap_content"android:layout_height="wrap_content"android:layout_marginBottom="30dp"android:layout_mar