上一篇文章已将说了一级购物车的逻辑，在这在按步骤贴一下二级购物车代码，我是用RecycleView嵌套RecycleView完成的，没有用二级列表，无非是下面几个逻辑，具体的看注释，具有一定的参考价值，感兴趣的可以参考一下！
先去第五步完成自定义View加减器，布局用；
逻辑：
全选或全不选（复选框）；
商品控制商家（复选框）；
商家控制商品复选框（复选框）；
商家和商品控制全选（复选框）；
复选框选中状态计算价格；
第一步：封装bean对象时，记得在商家和商品的bean对象内添加boolean变量。
//商家
public static class DataBean {
private boolean isGroupChecked;
..............................
public boolean isGroupChecked() {
return isGroupChecked;
}
public void setGroupChecked(boolean groupChecked) {
isGroupChecked = groupChecked;
}
}
————————————————————————————————————————————————————————————
//商品
public class ChildGoods {
private boolean isChildChecked;
..............................
public boolean isChildChecked() {
return isChildChecked;
}
public void setChildChecked(boolean childChecked) {
isChildChecked = childChecked;
}
}
第二步：（Activity或Fragment页面）
public class CartsFragment extends Fragment implements CartsView {
@BindView(R.id.checkAll)
CheckBox checkAll;
@BindView(R.id.priceAll)
TextView priceAll;
Unbinder unbinder;
@BindView(R.id.rlv_group)
RecyclerView rlvGroup;
private CartsPresenter presenter;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_carts, null, false);
unbinder = ButterKnife.bind(this, view);
rlvGroup.setLayoutManager(new LinearLayoutManager(getActivity()));
//实例p
presenter = new CartsPresenter(this);
presenter.attachView(this);
//关联p
presenter.onRelated();
return view;
}
@Override
public void getViewData(GroupGoods groupGoods) {
if (groupGoods != null) {
final List<GroupGoods.DataBean> data = groupGoods.getData();
final GroupAdapter groupAdapter = new GroupAdapter(getActivity(), data);
rlvGroup.setAdapter(groupAdapter);
//商家控制全选
groupAdapter.setGroupListener(new GroupAdapter.onGroupListener() {
@Override
public void onGroup(List<GroupGoods.DataBean> list) {
double priceSum = 0.0;//累计总价
int num1 = 0;//累计商品数量
int num2 = 0;//累计商品商品选中数量
for (int i = 0; i < list.size(); i++) {
List<ChildGoods> childGoods = list.get(i).getList();
for (int j = 0; j < childGoods.size(); j++) {
num1++;
boolean childChecked = childGoods.get(j).isChildChecked();
if (childChecked) {
num2++;
priceSum += childGoods.get(j).getPrice() * childGoods.get(j).getNum();
}
}
}
//判断商品选中数量和商品数量是否相等
if (num1 == num2) {
checkAll.setChecked(true);
} else {
checkAll.setChecked(false);
}
priceAll.setText("总价:" + priceSum);
}
});
/**
* 全选全不选
*/
checkAll.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
double priceSum = 0.0;
boolean isChecked = ((CheckBox) v).isChecked();
if (isChecked) {
for (int i = 0; i < data.size(); i++) {
data.get(i).setGroupChecked(true);
List<ChildGoods> list = data.get(i).getList();
for (int j = 0; j < list.size(); j++) {
list.get(j).setChildChecked(true);
//选中状态累加总价
priceSum += list.get(j).getPrice() * list.get(j).getNum();
}
}
} else {
for (int i = 0; i < data.size(); i++) {
data.get(i).setGroupChecked(false);
List<ChildGoods> list = data.get(i).getList();
for (int j = 0; j < list.size(); j++) {
list.get(j).setChildChecked(false);
}
}
}
groupAdapter.notifyDataSetChanged();
priceAll.setText("总价:"+priceSum);
}
});
}
}
//销毁
@Override
public void onDestroyView() {
super.onDestroyView();
unbinder.unbind();
presenter.detachView();
}
}
第三步：(商家适配器)
public class GroupAdapter extends RecyclerView.Adapter<GroupAdapter.MyViewHolder> {
private Context context;
private List<GroupGoods.DataBean> list;
public GroupAdapter(Context context, List<GroupGoods.DataBean> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.group_item, null, false);
MyViewHolder myViewHolder = new MyViewHolder(view);
return myViewHolder;
}
@Override
public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int i) {
myViewHolder.checkGroup.setChecked(list.get(i).isGroupChecked());
myViewHolder.nameGroup.setText(list.get(i).getSellerName());
//给商品设置适配器
myViewHolder.rlvChild.setLayoutManager(new LinearLayoutManager(context));
final List<ChildGoods> childlist = this.list.get(i).getList();
if (childlist.size() != 0) {
//商品适配器
final ChildAdapter childAdapter = new ChildAdapter(context, childlist);
myViewHolder.rlvChild.setAdapter(childAdapter);
//商品适配器接口监听
childAdapter.setChildListener(new ChildAdapter.onChildListener() {
@Override
public void onChild() {
//商品监听到就调用商家接口回调到主页面
if (groupListener != null) {
groupListener.onGroup(list);
}
//声明变量
boolean isChecked = true;
//遍历商品状态
for (int j = 0; j < childlist.size(); j++) {
boolean childChecked = childlist.get(j).isChildChecked();
if (!childChecked) {
isChecked = false;
break;
}
}
//通过商品状态改变商家状态
myViewHolder.checkGroup.setChecked(isChecked);
list.get(i).setGroupChecked(isChecked);
}
});
//商家控制商品
myViewHolder.checkGroup.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
//先改变商家状态
myViewHolder.checkGroup.setChecked(myViewHolder.checkGroup.isChecked());
//改变商品状态-->调用商品适配器方法
childAdapter.setCheckChild(myViewHolder.checkGroup.isChecked());
}
});
}
}
@Override
public int getItemCount() {
return list.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.check_group)
CheckBox checkGroup;
@BindView(R.id.name_group)
TextView nameGroup;
@BindView(R.id.rlv_child)
RecyclerView rlvChild;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
public interface onGroupListener {
void onGroup(List<GroupGoods.DataBean> list);
}
public onGroupListener groupListener;
public void setGroupListener(onGroupListener groupListener) {
this.groupListener = groupListener;
}
}
第四步：(商品适配器)
public class ChildAdapter extends RecyclerView.Adapter<ChildAdapter.MyViewHolder> {
private Context context;
private List<ChildGoods> list;
public ChildAdapter(Context context, List<ChildGoods> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(context).inflate(R.layout.child_item, null, false);
MyViewHolder myViewHolder = new MyViewHolder(view);
return myViewHolder;
}
@Override
public void onBindViewHolder(@NonNull final MyViewHolder myViewHolder, final int i) {
myViewHolder.checkChild.setChecked(list.get(i).isChildChecked());
myViewHolder.imgChild.setImageURI(Uri.parse(list.get(i).getImages()));
myViewHolder.priceChild.setText("¥：" + list.get(i).getPrice());
myViewHolder.titleChild.setText(list.get(i).getTitle());
//调用自定义view加减器内方法
myViewHolder.myaddjian.setData(this,list,i);
//监听加减器接口
myViewHolder.myaddjian.setNumChangeListener(new CustomAddJian.onNumChangeListener() {
@Override
public void onResult() {
if (childListener!=null){
childListener.onChild();
}
}
});
//商品状态改变
myViewHolder.checkChild.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (childListener!=null){
//先改变自身状态
list.get(i).setChildChecked(isChecked);
childListener.onChild();
}
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public void setCheckChild(boolean checked) {
//商家适配器调用的方法
//通过该方法实现商家内部全选
for (int i = 0; i < list.size(); i++) {
list.get(i).setChildChecked(checked);
}
notifyDataSetChanged();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
@BindView(R.id.img_child)
SimpleDraweeView imgChild;
@BindView(R.id.title_child)
TextView titleChild;
@BindView(R.id.price_child)
TextView priceChild;
@BindView(R.id.check_child)
CheckBox checkChild;
@BindView(R.id.myaddjian)
CustomAddJian myaddjian;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
public interface onChildListener{
void onChild();
}
public onChildListener childListener;
public void setChildListener(onChildListener childListener) {
this.childListener = childListener;
}
}
第五步：（自定义View加减器）
public class CustomAddJian extends LinearLayout {
private TextView add;
private TextView jian;
private EditText num_edit;
private int number;
private ChildAdapter childAdapter;
private List<ChildGoods> list;
private int i;
public CustomAddJian(Context context) {
super(context);
}
public CustomAddJian(final Context context, AttributeSet attrs) {
super(context, attrs);
LayoutInflater.from(context).inflate(R.layout.custom_addjian, this);
add = findViewById(R.id.add_custom);
jian = findViewById(R.id.jian_custom);
num_edit = findViewById(R.id.num_custom);
//加号点击事件
add.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
number++;
num_edit.setText(number + "");
list.get(i).setNum(number);
numChangeListener.onResult();
childAdapter.notifyDataSetChanged();
}
});
//减号点击事件
jian.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (number <= 1) {
Toast.makeText(context, "不能再减了", Toast.LENGTH_SHORT).show();
} else {
number--;
num_edit.setText(number + "");
list.get(i).setNum(number);
numChangeListener.onResult();
childAdapter.notifyDataSetChanged();
}
}
});
}
//商品适配器调用的方法
public void setData(ChildAdapter childAdapter, List<ChildGoods> list, int i) {
this.childAdapter = childAdapter;
this.list = list;
this.i = i;
number = list.get(i).getNum();
num_edit.setText(list.get(i).getNum() + "");
}
public interface onNumChangeListener {
void onResult();
}
public onNumChangeListener numChangeListener;
public void setNumChangeListener(onNumChangeListener numChangeListener) {
this.numChangeListener = numChangeListener;
}
}