關于左邊點擊右邊
private Itemclick itemclick;

public void setItemclick(Itemclick itemclick) {
this.itemclick = itemclick;
}

public interface Itemclick{
void click(int cid);
}
mh.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
itemclick.click(list.get(i).getCid());
}
});
leftrv =view.findViewById(R.id.leftrv);
rightrv =view.findViewById(R.id.rightrv);
leftrv.setLayoutManager(new LinearLayoutManager(getActivity()));
rightrv.setLayoutManager(new LinearLayoutManager(getActivity()));
adapter = new LeftAdapter(getActivity());
adapter1 = new RightAdapter(getActivity());
presenter = new ShowPresenter(this);
presenter.show1(UserApi.RIGHT_API,null);
presenter.show(UserApi.LEFTFEN_API,null);
leftrv.setAdapter(adapter);
rightrv.setAdapter(adapter1);
adapter.setItemclick(new LeftAdapter.Itemclick() {
@Override
public void click(int cid) {
HashMap<String,String> params=new HashMap<>();
params.put(“cid”,cid+"");
presenter.show1(UserApi.RIGHT_API,params);
}
});
}
關于購物車
void notityNum();
void nitify(boolean isChecked,int pos);
//void niticart();
*

• 計算總價
• */
• // adapter.setCartCallback(this);（這句話？？？）
  public void getTotalprice(){
  double totalprice=0;
  for (ShowcartsBean.Data datum : data) {
  for (ShowcartsBean.Data.LA la : datum.list) {
  if(la.isProductChecked) {
  totalprice += la.price * la.productNum;
  }
  }
  }
  fprice.setText(“￥：”+totalprice);
  }

@Override
public void niticart() {
getTotalprice();
}
@Override
public void onSuccessCarts(String result) {
final ShowcartsBean showcartsBean = new Gson().fromJson(result, ShowcartsBean.class);
data = showcartsBean.data;
for (ShowcartsBean.Data datum : data) {
for (ShowcartsBean.Data.LA la : datum.list) {
la.productNum=1;
}
}
adapter.setList(data);
adapter.setCardUIcallback(this);

}
public class FragmentFour extends Fragment implements AContract.AView,CartUICallback {

private CheckBox cb; private RecyclerView rvv; private TextView price; private Button btn_order; private SerachPresenter presenter; private AddsAdapter adapter; private List<ShowcartsBean.Data> data; private TextView fprice;@Nullable @Override public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {final View view = inflater.inflate(R.layout.fragmentfour, container, false);return view; }@Override public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);cb =view.findViewById(R.id.cb);fprice =view.findViewById(R.id.price);rvv =view.findViewById(R.id.rvv);price =view.findViewById(R.id.price);btn_order = view.findViewById(R.id.btn_order);rvv.setLayoutManager(new LinearLayoutManager(getActivity()));adapter = new AddsAdapter(getActivity(),this);presenter = new SerachPresenter(this);HashMap<String,String> params=new HashMap<>();params.put("uid","24421");presenter.addcartss(UserApi.SHOWCATRS_API,params);rvv.setAdapter(adapter);cb.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {@Overridepublic void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {if(isChecked){for (ShowcartsBean.Data datum : data) {datum.isChecked=true;for (ShowcartsBean.Data.LA la : datum.list) {la.isProductChecked=true;}}}else{for (ShowcartsBean.Data datum : data) {datum.isChecked=false;for (ShowcartsBean.Data.LA la : datum.list) {la.isProductChecked=false;}}}adapter.notifyDataSetChanged();getTotalprice();}}); } 父子類 package com.example.addcarts.adapter;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.TextView;

import com.example.addcarts.R;
import com.example.addcarts.callback.CardCallback;
import com.example.addcarts.callback.CartUICallback;
import com.example.addcarts.entity.ShowcartsBean;

import java.util.ArrayList;
import java.util.List;

public class AddsAdapter extends RecyclerView.Adapter<AddsAdapter.VV> implements CardCallback {
private Context context;
private List<ShowcartsBean.Data> list;
private CartUICallback cartUICallback;

public AddsAdapter(Context context, CartUICallback cartUICallback) {this.context = context;this.list=new ArrayList<>();this.cartUICallback = cartUICallback; }public void setList(List<ShowcartsBean.Data> list) {if(list!=null) {this.list = list;}notifyDataSetChanged(); }@NonNull @Override public AddsAdapter.VV onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {final View view = LayoutInflater.from(context).inflate(R.layout.fragitem, viewGroup, false);return new VV(view); }@Override public void onBindViewHolder(@NonNull final AddsAdapter.VV vv, final int i) {for (ShowcartsBean.Data.LA la : list.get(i).list) {la.pos=i;}vv.name.setText(list.get(i).sellerName);vv.fcheckbox.setChecked(list.get(i).isChecked);vv.rvv.setLayoutManager(new LinearLayoutManager(context));vv.rvv.setAdapter(new AddshowAdapter(context,list.get(i).list,this));new AddshowAdapter(context,list.get(i).list,this)).setCartCallback(this);vv.fcheckbox.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {list.get(i).isChecked=vv.fcheckbox.isChecked();for (ShowcartsBean.Data.LA la : list.get(i).list) {la.isProductChecked=list.get(i).isChecked;}notifyDataSetChanged();if(cartUICallback!=null){cartUICallback.niticart();}}});}@Override public int getItemCount() {return list.size(); }@Override public void notityNum() {if(cartUICallback!=null){cartUICallback.niticart();} }@Override public void nitify(boolean isChecked, int pos) {list.get(pos).isChecked=isChecked;if(cartUICallback!=null){cartUICallback.niticart();}notifyDataSetChanged(); }public class VV extends RecyclerView.ViewHolder {private CheckBox fcheckbox;private TextView name;private RecyclerView rvv;public VV(@NonNull View itemView) {super(itemView);name=itemView.findViewById(R.id.name);rvv=itemView.findViewById(R.id.frv);fcheckbox=itemView.findViewById(R.id.fcheckbox);} }

}
子類適配器
package com.example.addcarts.adapter;

import android.content.Context;
import android.graphics.PorterDuff;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckBox;
import android.widget.ImageView;
import android.widget.TextView;

import com.bumptech.glide.Glide;
import com.example.addcarts.R;
import com.example.addcarts.callback.CardCallback;
import com.example.addcarts.entity.ShowcartsBean;
import com.example.addcarts.width.AddminView;

import java.util.ArrayList;
import java.util.List;

public class AddshowAdapter extends RecyclerView.Adapter<AddshowAdapter.VG> {
private Context context;
private List<ShowcartsBean.Data.LA> list;
private CardCallback cardCallback;

public AddshowAdapter(Context context, List<ShowcartsBean.Data.LA> list, CardCallback cardCallback) {this.context = context;this.list = list;this.cardCallback = cardCallback; }@NonNull @Override public AddshowAdapter.VG onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {final View view = LayoutInflater.from(context).inflate(R.layout.fragmentfouritem, viewGroup, false);return new VG(view); }@Override public void onBindViewHolder(@NonNull final AddshowAdapter.VG vg, final int i) {vg.checkBox.setChecked(list.get(i).isProductChecked);vg.name.setText(list.get(i).title);vg.price.setText(list.get(i).price+"");final String[] split = list.get(i).images.split("!");Glide.with(context).load(split[0]).into(vg.icon);vg.checkBox.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {list.get(i).isProductChecked=vg.checkBox.isChecked();for (ShowcartsBean.Data.LA la : list) {if(!la.isProductChecked){cardCallback.nitify(false,la.pos);return;}cardCallback.nitify(true,la.pos);}}});vg.addminView.setAddminu(new AddminView.Addminu() {@Overridepublic void addm(int num) {list.get(i).productNum=num;cardCallback.notityNum();}});vg.addminView.setNum(list.get(i).productNum); }@Override public int getItemCount() {return list.size(); }public class VG extends RecyclerView.ViewHolder {private CheckBox checkBox;private ImageView icon;private TextView name;private TextView price;private AddminView addminView;public VG(@NonNull View itemView) {super(itemView);checkBox=itemView.findViewById(R.id.checkbox);icon=itemView.findViewById(R.id.icon);name=itemView.findViewById(R.id.fv_name);price=itemView.findViewById(R.id.fv_price);addminView=itemView.findViewById(R.id.addmin);} }

}
自定義組合加減
final View view = LayoutInflater.from(context).inflate(R.layout.addview, this, true);
addTV = view.findViewById(R.id.add);
minusTv = view.findViewById(R.id.minus);
numTv = view.findViewById(R.id.et_num);
minusTv.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
num = Integer.parseInt(numTv.getText().toString());
num–;
if(num==0){
num=1;
Toast.makeText(getContext(),“不能再減了”,Toast.LENGTH_SHORT).show();
}
numTv.setText(num+"");
addminu.addm(num);
}
});
addTV.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
num = Integer.parseInt(numTv.getText().toString());
num++;
numTv.setText(num+"");
addminu.addm(num);
}
});
}

public void setNum(int num) {
numTv.setText(num+"");
}

private Addminu addminu;

public void setAddminu(Addminu addminu) {
this.addminu = addminu;
}

public interface Addminu{
void addm(int num);
}

總結

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