Retrofit+Rxjava2.0+MVP的一个Android购物车

导入依赖

    //添加retrofit依赖
    implementation 'com.squareup.retrofit2:retrofit:2.4.0'
    //添加gson转换器的依赖
    implementation 'com.squareup.retrofit2:converter-gson:2.4.0'
    //注意 rxjava2是2.0的 不加2表示的是1.0
    implementation 'io.reactivex.rxjava2:rxjava:2.1.10'
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.2'
    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    //fresco
    implementation 'com.facebook.fresco:fresco:1.9.0'
    //Butterknife
    implementation 'com.jakewharton:butterknife:8.4.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'

各个接口

//V层接口
public interface IMainView {

    //展示购物车
    void showShoppCart(ShoppCartBean shoppCartBean);

    //购物车的uid
    String uid();

}
//M层接口
public interface IModel {

    //获取购物车数据
    void getDataShoppCart(Map map);
}
//P层接口
public interface IPresenter {

    //p的购物车请求数据
    void showLoginToView(IModel iModel, IMainView iMainView);

    //接受从m传上来的数据
    void getDataModel(ShoppCartBean shoppCartBean);
}

布局

//activity_main布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".view.MainActivity">

    <ExpandableListView
        android:id="@+id/expan_able"
        android:layout_width="match_parent"
        android:groupIndicator="@null"
        android:layout_weight="1"
        android:layout_height="0dp">

    ExpandableListView>

    <LinearLayout
        android:layout_width="match_parent"
        android:orientation="horizontal"
        android:gravity="center_vertical"
        android:layout_height="wrap_content">

        <CheckBox
            android:id="@+id/quan_cbox"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
        <TextView
            android:id="@+id/total"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:text="合计：0"
            android:layout_height="wrap_content" />
        <TextView
            android:background="#ff0000"
            android:text="去结算（0）"
            android:textStyle="bold"
            android:gravity="center"
            android:layout_width="100dp"
            android:layout_height="40dp" />
    LinearLayout>
LinearLayout>

//parent布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="wrap_content">
    <CheckBox
        android:id="@+id/parent_box"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/parent_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
LinearLayout>

//child布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="wrap_content">

    <CheckBox
        android:id="@+id/child_box"
        android:layout_gravity="center_vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <com.facebook.drawee.view.SimpleDraweeView
        android:id="@+id/child_img"
        android:layout_width="90dp"
        android:layout_height="90dp" />
    <LinearLayout
        android:orientation="vertical"
        android:layout_gravity="center"
        android:layout_marginLeft="6dp"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/child_title"
            android:maxLines="1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
            <TextView
                android:id="@+id/child_price"
                android:textColor="#ff0000"
                android:layout_marginTop="10dp"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
            <wby.laowang.newshoppcart.view.AddSubView
                android:id="@+id/addsub"
                android:layout_marginLeft="15dp"
                android:layout_width="110dp"
                android:layout_height="30dp">

            wby.laowang.newshoppcart.view.AddSubView>
        LinearLayout>

    LinearLayout>

    <TextView
        android:id="@+id/child_delete"
        android:text="删除"
        android:gravity="center"
        android:layout_gravity="center"
        android:layout_marginRight="7dp"
        android:background="#ff0000"
        android:layout_width="50dp"
        android:layout_height="70dp" />
LinearLayout>

//自定义View加减的布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:gravity="center_vertical"
    android:background="@drawable/add_shape"
    android:layout_height="wrap_content">

    <TextView
        android:id="@+id/sub"
        android:text="-"
        android:gravity="center"
        android:background="@drawable/add_shape"
        android:layout_width="30dp"
        android:layout_height="30dp" />
    <EditText
        android:id="@+id/count"
        android:background="@null"
        android:layout_width="50dp"
        android:gravity="center"
        android:layout_height="30dp" />
    <TextView
        android:id="@+id/add"
        android:text="+"
        android:gravity="center"
        android:background="@drawable/add_shape"
        android:layout_width="30dp"
        android:layout_height="30dp" />
LinearLayout>

Model层

 //在bean中加入判断父check的flag
 private boolean parent_flag;

   public boolean isParent_flag() {
          return parent_flag;
      }

   public void setParent_flag(boolean parent_flag) {
          this.parent_flag = parent_flag;
      }
  //在bean中加入判断子check的flag
  private boolean child_flag;

      public boolean isChild_flag() {
             return child_flag;
          }

      public void setChild_flag(boolean child_flag) {
            this.child_flag = child_flag;
         }
//Model的逻辑层 

/**
 * model的具体实现
 */

public class ModelFusion implements IModel {

    private IPresenter iPresenter;

    public ModelFusion(IPresenter iPresenter) {
        this.iPresenter = iPresenter;
    }

    @Override
    public void getDataShoppCart(Map map) {

        //网络请求
        RetrofitUtil retrofitUtil = RetrofitUtil.getInstance();
        MyService myService = retrofitUtil.createRequest(MyService.class);
        Observable observable = myService.getshoppcart(map);
        //请求执行
        observable.subscribeOn(Schedulers.newThread())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer() {
                    @Override
                    public void onSubscribe(Disposable d) {

                    }

                    @Override
                    public void onNext(ShoppCartBean shoppCartBean) {

                        iPresenter.getDataModel(shoppCartBean);
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });
    }
}

Presenter层

/**
 * Presenter的操作类
 */

public class PresenterFusion implements IPresenter {

    private IMainView iMainView;

    @Override
    public void showLoginToView(IModel iModel, IMainView iMainView) {
        this.iMainView = iMainView;
        Map map = new HashMap<>();
        map.put("uid",iMainView.uid());
        iModel.getDataShoppCart(map);
    }

    @Override
    public void getDataModel(ShoppCartBean shoppCartBean) {
        iMainView.showShoppCart(shoppCartBean);
    }

}

View层

public class MainActivity extends AppCompatActivity implements IMainView{

    @BindView(R.id.expan_able)
    ExpandableListView expanAble;
    @BindView(R.id.quan_cbox)
    CheckBox quanCbox;
    @BindView(R.id.total)
    TextView total;
    private MyExpanAdapter myExpanAdapter;
    private ShoppCartBean shopplist;
    private String suid = "10756";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        initdatas();
    }

    public void initdatas(){
        PresenterFusion presenterFusion = new PresenterFusion();
        presenterFusion.showLoginToView(new ModelFusion(presenterFusion),this);

        quanCbox.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                boolean quan_checked = quanCbox.isChecked();
                List data = shopplist.getData();

                for (int i = 0; i < data.size() ; i++){
                    data.get(i).setParent_flag(quan_checked);

                    List list = data.get(i).getList();
                    for (int j = 0; j < list.size(); j++) {
                        list.get(j).setChild_flag(quan_checked);
                    }
                }
                myExpanAdapter.notifyDataSetChanged();

                double sum = 0;

                for (int p = 0; p < data.size(); p++) {

                    List plist = shopplist.getData().get(p).getList();

                    for (int o = 0; o < plist.size(); o++) {

                        boolean child_flag = plist.get(o).isChild_flag();
                        if (child_flag) {
                            double price = plist.get(o).getPrice()*plist.get(o).getNum();
                            sum += price;
                        }

                    }
                }

                total.setText("合计:"+sum);
            }
        });
    }

    @Override
    public void showShoppCart(ShoppCartBean shoppCartBean) {
        this.shopplist = shoppCartBean;

        myExpanAdapter = new MyExpanAdapter(MainActivity.this,shoppCartBean.getData());
        expanAble.setAdapter(myExpanAdapter);

        int count = expanAble.getCount();
        for (int i = 0; i < count; i++) {
            expanAble.expandGroup(i);
        }
    }

    @Override
    public String uid() {
        return suid;
    }
}

二级列表适配器

public class MyExpanAdapter extends BaseExpandableListAdapter {

    private Context context;
    private List slist;

    public MyExpanAdapter(Context context, List slist) {
        this.context = context;
        this.slist = slist;
    }

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

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

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

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

    @Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        final ParentViewHolder parentViewHolder;
        if (convertView == null){
            parentViewHolder = new ParentViewHolder();
            convertView = View.inflate(context, R.layout.item_parent,null);

            parentViewHolder.parent_box = convertView.findViewById(R.id.parent_box);
            parentViewHolder.parent_title = convertView.findViewById(R.id.parent_title);

            convertView.setTag(parentViewHolder);
        }else {
            parentViewHolder = (ParentViewHolder) convertView.getTag();
        }

        parentViewHolder.parent_title.setText(slist.get(groupPosition).getSellerName());
        parentViewHolder.parent_box.setChecked(slist.get(groupPosition).isParent_flag());

        parentViewHolder.parent_box.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean ischecked = parentViewHolder.parent_box.isChecked();
                slist.get(groupPosition).setParent_flag(ischecked);

                List list = slist.get(groupPosition).getList();
                for (int i = 0; i < list.size(); i++) {
                    ShoppCartBean.DataBean.ListBean listBean = list.get(i);
                    listBean.setChild_flag(ischecked);
                }
                notifyDataSetChanged();

            }
        });
        return convertView;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
        final ChildViewHolder childViewHolder;
        if (convertView == null){
            childViewHolder = new ChildViewHolder();
            convertView = View.inflate(context, R.layout.item_child,null);

            childViewHolder.child_box = convertView.findViewById(R.id.child_box);
            childViewHolder.child_delete = convertView.findViewById(R.id.child_delete);
            childViewHolder.child_img = convertView.findViewById(R.id.child_img);
            childViewHolder.child_price = convertView.findViewById(R.id.child_price);
            childViewHolder.child_title = convertView.findViewById(R.id.child_title);
            childViewHolder.addSubView = convertView.findViewById(R.id.addsub);

            convertView.setTag(childViewHolder);
        }else {
            childViewHolder = (ChildViewHolder) convertView.getTag();
        }
        final List list = slist.get(groupPosition).getList();
        childViewHolder.child_title.setText(list.get(childPosition).getTitle());
        childViewHolder.child_price.setText("￥: "+list.get(childPosition).getPrice());
        childViewHolder.child_box.setChecked(list.get(childPosition).isChild_flag());

        String[] imags = list.get(childPosition).getImages().split("\\|");
        Uri parse = Uri.parse(imags[0]);
        childViewHolder.child_img.setImageURI(parse);

        childViewHolder.addSubView.setCount(list.get(childPosition).getNum());
        childViewHolder.addSubView.setOnAddClick(new AddSubView.OnAddSubClick() {
            @Override
            public void onAddSubClick() {
                String count = childViewHolder.addSubView.getCount();
                list.get(childPosition).setNum(Integer.parseInt(count));
                notifyDataSetChanged();
            }
        });
        childViewHolder.child_box.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean child_checked = childViewHolder.child_box.isChecked();
                list.get(childPosition).setChild_flag(child_checked);

                boolean ch_flag = true;//一个开关标记
                for (int i = 0; i < list.size(); i++){
                    boolean child_flag = list.get(i).isChild_flag();
                    if (child_flag == false){
                        ch_flag = false;
                    }
                }
                slist.get(groupPosition).setParent_flag(ch_flag);

                notifyDataSetChanged();
            }
        });

        childViewHolder.child_delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                slist.remove(groupPosition);
                list.remove(childPosition);
                notifyDataSetChanged();
            }
        });
        return convertView;
    }

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

    static class ParentViewHolder{
        CheckBox parent_box;
        TextView parent_title;
    }

    static class ChildViewHolder{
        CheckBox child_box;
        ImageView child_img;
        TextView child_title;
        TextView child_price;
        TextView child_delete;
        AddSubView addSubView;
    }

}

自定义加减View

public class AddSubView extends LinearLayout implements View.OnClickListener {

    private TextView add;
    private TextView sub;
    private EditText count;
    private OnAddSubClick onAddClick;

    public AddSubView(Context context) {
        this(context,null);
    }

    public AddSubView(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs,0);
    }

    public AddSubView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        View view = View.inflate(context, R.layout.add_layout, this);
        add = view.findViewById(R.id.add);
        sub = view.findViewById(R.id.sub);
        count = view.findViewById(R.id.count);

        add.setOnClickListener(this);
        sub.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()){
            case R.id.add:
                add();
                onAddClick.onAddSubClick();
                break;
            case R.id.sub:
                sub();
                onAddClick.onAddSubClick();
                break;
        }

    }

    //添加
    public void add(){
        String s = count.getText().toString();
        int i = Integer.parseInt(s);
        i++;
        count.setText(i+"");

    }

    //减少
    public void sub(){
        String s = count.getText().toString();
        int i = Integer.parseInt(s);
        if (i>=1){
            i--;
            count.setText(i+"");
        }
    }
    //获取数量
    public String getCount(){
        return count.getText().toString();
    }
    //设置数量
    public void setCount(int cousize){
        count.setText(cousize+"");
    }

    public interface OnAddSubClick{
        void onAddSubClick();
    }
    public void setOnAddClick(OnAddSubClick onAddClick){
        this.onAddClick = onAddClick;
    }
}