购物车+通用适配器

添加bean中复选框状态值

父控件状态值：

     private boolean parentIsSelected;

        public boolean isParentIsSelected() {
            return parentIsSelected;
        }

        public void setParentIsSelected(boolean parentIsSelected) {
            this.parentIsSelected = parentIsSelected;
        }

子控件状态值：

    //是否选中的状态
private boolean ChildIsSelect;


        public boolean isChildIsSelect() {
            return ChildIsSelect;
        }

        public void setChildIsSelect(boolean childIsSelect) {
            ChildIsSelect = childIsSelect;
        }

工具类–计算总价

/**
 * 工具类---计算总和
 */

public class SumUtils {

    public static String sum(List<GoodsBean.DataBean> data){
        double sum=0;
        for (int i = 0; i < data.size(); i++) {

            List<GoodsBean.ChildBean> list = data.get(i).getList();
            for (int j = 0; j < list.size(); j++) {
                GoodsBean.ChildBean childBean = list.get(j);
//                如果被选中就累加价钱
                if (childBean.isChildIsSelect()){
                    sum+=childBean.getPrice()*childBean.getNum();
                }
            }

        }

        return Double.toString(sum);
    }

}

适配器

public class MyAdapter extends BaseExpandableListAdapter {
    List<GoodsBean.DataBean> data;
    Context context;
    IMainView iMainView;
    private ViewHolder holder;
    private ViewHolder1 holder1;

    public MyAdapter(List<GoodsBean.DataBean> data, Context context, IMainView iMainView) {
        this.data = data;
        this.context = context;
        this.iMainView = iMainView;
    }
    //获取父分组的个数
    @Override
    public int getGroupCount() {
        return data.size();
    }
    //获取子分组的个数
    @Override
    public int getChildrenCount(int groupPosition) {
        return data.get(groupPosition).getList().size();
    }
    //获取父分组的对象
    @Override
    public Object getGroup(int groupPosition) {
        return data.get(groupPosition);
    }
    //获取子分组的对象
    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return data.get(groupPosition).getList().get(childPosition);
    }
    // //获取父分组的id
    @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) {
//优化赋值
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.layout_parent, null);
            holder = new ViewHolder(convertView);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.mParentTitle.setText(data.get(groupPosition).getSellerName());
        holder.mParentCb.setChecked(data.get(groupPosition).isParentIsSelected());
        //商家单选框
        holder.mParentCb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                boolean selected = data.get(groupPosition).isParentIsSelected();
                selected = !selected;
                data.get(groupPosition).setParentIsSelected(selected);
                //点击父条目的复选框，子条目，相应的改变
                //将复选框的状态赋值给子复选框
                List<GoodsBean.ChildBean> list = MyAdapter.this.data.get(groupPosition).getList();
                for (int i = 0; i < list.size(); i++) {
                    GoodsBean.ChildBean childBean = list.get(i);
                    childBean.setChildIsSelect(selected);
                }
                notifyDataSetChanged();
            }
        });
//计算
        String sum = SumUtils.sum(data);
        iMainView.showCount(sum);

        return convertView;
    }

    @Override
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
//优化赋值
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.layout_child, null);
            holder1 = new ViewHolder1(convertView);
            convertView.setTag(holder1);
        } else {
            holder1 = (ViewHolder1) convertView.getTag();
        }

        List<GoodsBean.ChildBean> childBeanList = MyAdapter.this.data.get(groupPosition).getList();

        holder1.mChildPrice.setText(childBeanList.get(childPosition).getPrice() + "￥");
        holder1.mChildTitle.setText(childBeanList.get(childPosition).getTitle());
//图片赋值
        String images = childBeanList.get(childPosition).getImages();
        String pic_url = images.split("\\|")[0];
        Glide.with(context).load(pic_url).into(holder1.mChildPic);
//        单选框状态赋值

        holder1.mChildCb.setChecked(data.get(groupPosition).getList().get(childPosition).isChildIsSelect());
//       加减条目赋值
        holder1.addSubView.setCount(data.get(groupPosition).getList().get(childPosition).getNum());

        holder1.mChildCb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                boolean select = data.get(groupPosition).getList().get(childPosition).isChildIsSelect();
                select = !select;
                data.get(groupPosition).getList().get(childPosition).setChildIsSelect(select);
                //当所有的字条目被选中，父条目也要被选中。如果有一个字条目没有选中，父条目就不能选中
                List<GoodsBean.ChildBean> list = MyAdapter.this.data.get(groupPosition).getList();
                boolean flag = true;
                for (int i = 0; i < list.size(); i++) {
                    if (!list.get(i).isChildIsSelect()) {
                        flag = false;
                    }
                }

                data.get(groupPosition).setParentIsSelected(flag);
                notifyDataSetChanged();

                //计算
                String sum = SumUtils.sum(data);
                iMainView.showCount(sum);

            }
        });


        //减条目
        holder1.addSubView.setOnSubClickListener(new AddSubView.SubClickListener() {
            @Override
            public void onSubClick(View view, int count) {
//                获取子条目中减条目  设置数值
                data.get(groupPosition).getList().get(childPosition).setNum(count);
                boolean select = data.get(groupPosition).getList().get(childPosition).isChildIsSelect();
//                如果复选框被选中就计算价钱
                if (select) {
                    String sum = SumUtils.sum(data);
                    iMainView.showCount(sum);
                }
            }
        });
        //加条目
        holder1.addSubView.setOnAddClickListener(new AddSubView.AddClickListener() {
            @Override
            public void onAddClick(View view, int count) {
//                获取子条目中加条目  设置数值
                data.get(groupPosition).getList().get(childPosition).setNum(count);
                boolean select = data.get(groupPosition).getList().get(childPosition).isChildIsSelect();
//                如果复选框被选中就计算价钱
                if (select) {
                    String sum = SumUtils.sum(data);
                    iMainView.showCount(sum);
                }

            }
        });

        return convertView;
    }
//子条目可以点击
    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }


    static class ViewHolder {
        View view;
        CheckBox mParentCb;
        TextView mParentTitle;

        ViewHolder(View view) {
            this.view = view;
            this.mParentCb = view.findViewById(R.id.parent_cb);
            this.mParentTitle = view.findViewById(R.id.parent_title);
        }
    }

    class ViewHolder1 {
        View view;
        CheckBox mChildCb;
        ImageView mChildPic;
        TextView mChildTitle;
        TextView mChildPrice;
        AddSubView addSubView;

        ViewHolder1(View view) {
            this.view = view;
            this.mChildCb = view.findViewById(R.id.child_cb);
            this.mChildPic = view.findViewById(R.id.child_pic);
            this.mChildTitle = view.findViewById(R.id.child_title);
            this.mChildPrice = view.findViewById(R.id.child_price);
            this.addSubView = view.findViewById(R.id.add_sub_view);
        }
    }
}

主界面main

public class MainActivity extends AppCompatActivity implements IMainView, View.OnClickListener {
    List<GoodsBean.DataBean> list;
    private ExpandableListView mMyexpandle;
    private CheckBox mCbQx;
    /**
     * 合计:0
     */
    private TextView mTvSum;
    /**
     * 去结算（0）
     */
    private Button mJisuan;
    private MyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();

        Presenter presenter = new Presenter();
        presenter.showShoppingCarToView(new ModleImpl(), this);


    }

    @Override
    public void showGowWuList(List<GoodsBean.DataBean> data) {
        list = data;

        adapter = new MyAdapter(data, this,this);
        mMyexpandle.setAdapter(adapter);
//        打开二级列表
        int count = mMyexpandle.getCount();
        for (int i = 0; i < count; i++) {
            mMyexpandle.expandGroup(i);
        }
//        分割线
        mMyexpandle.setDivider(getResources().getDrawable(R.drawable.shap_param));
        mMyexpandle.setChildDivider(getResources().getDrawable(R.drawable.shap_child));

    }

    @Override
    public void showCount(String count) {
        mTvSum.setText("总价："+count);
    }

    private void initView() {
        mMyexpandle = (ExpandableListView) findViewById(R.id.myexpandle);
        mCbQx = (CheckBox) findViewById(R.id.cb_qx_main);
        mCbQx.setOnClickListener(this);
        mTvSum = (TextView) findViewById(R.id.tv_sum);
        mJisuan = (Button) findViewById(R.id.jisuan);
        mJisuan.setOnClickListener(this);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            default:
                break;
//                全选   获取bean中的多选框状态值，赋予状态
            case R.id.cb_qx_main:
                boolean checked = mCbQx.isChecked();
                //只需要改变集合里面的数据，就可以了，然后刷新
                for (int i = 0; i < list.size(); i++) {
                    DataBean dataBean = list.get(i);
                    dataBean.setParentIsSelected(checked);
                    //获得子集合，遍历
                    List<GoodsBean.ChildBean> list1 = dataBean.getList();
                    for (int j = 0; j < list1.size(); j++) {
                        list1.get(j).setChildIsSelect(checked);
                    }

                }
                //刷新即可
                adapter.notifyDataSetChanged();

                break;
            case R.id.jisuan:
                Toast.makeText(this, "去结算------", Toast.LENGTH_SHORT).show();

                break;

        }
    }
}

条目布局

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

    <CheckBox
        android:id="@+id/parent_cb"
        style="@style/Widget.AppCompat.CompoundButton.RadioButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/parent_title"
        android:text="商家"
        android:singleLine="true"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>


//子布局


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

    <CheckBox
        android:id="@+id/child_cb"
        style="@style/Widget.AppCompat.CompoundButton.RadioButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/child_pic"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:src="@mipmap/ic_launcher" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:singleLine="true"
            android:id="@+id/child_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="商品名"
            android:textSize="25sp" />
<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    >
        <TextView
            android:singleLine="true"
            android:id="@+id/child_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="商品价格"
            android:textColor="#F00" />

    <com.example.dell.myshoppingcar.view.AddSubView
        android:id="@+id/add_sub_view"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="40dp">

    </com.example.dell.myshoppingcar.view.AddSubView>

</LinearLayout>

    </LinearLayout>
</LinearLayout>

自定义加减控件

public class AddSubView extends LinearLayout implements View.OnClickListener {
    private TextView sub;
    private TextView add;
    private EditText count;
    private AddClickListener addClickListener;
    private SubClickListener subClickListener;

    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_sub_layout, this);

        //获取控件
        sub = view.findViewById(R.id.sub);
        add = view.findViewById(R.id.add);
        count = view.findViewById(R.id.count);
        sub.setOnClickListener(this);
        add.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.sub:
                Log.d("AddSubView-----", "点击-号");
//                获取Editext值，如果大于0，就减减数值
                String s = count.getText().toString();
                int i = Integer.parseInt(s);
                if (i <= 0) {
                    return;
                }
                count.setText(--i + "");
                Log.d("AddSubView-------+--", "-----i:" + i);
                subClickListener.onSubClick(v, i);

                break;
            case R.id.add:
                Log.d("AddSubView-----", "点击+号");
//                获取Editext值，如果大于0，就加价数值
                String s1 = count.getText().toString();
                int i1 = Integer.parseInt(s1);
                count.setText(++i1 + "");
                Log.d("AddSubView++++++++++", "-----i:" + i1);
                addClickListener.onAddClick(v, i1);
                break;


        }
    }

    public int getCount() {
        return Integer.parseInt(count.getText().toString().trim());
    }

    public void setCount(int s) {
        count.setText(s + "");
    }

//内部监听----加数值
    public interface AddClickListener {
        void onAddClick(View view, int count);
    }
//外部调用----加数值
    public void setOnAddClickListener(AddClickListener addClickListener) {
        this.addClickListener = addClickListener;
    }
    //内部监听----减数值
    public interface SubClickListener {
        void onSubClick(View view, int count);
    }
    //外部调用----减数值
    public void setOnSubClickListener(SubClickListener subClickListener) {
        this.subClickListener = subClickListener;
    }


}

自定义控件布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100dp"
    android:layout_height="30dp"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/sub"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@drawable/add_sub_shape"
        android:gravity="center"
        android:text="-"
        android:textSize="25sp" />

    <EditText
        android:id="@+id/count"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@drawable/add_sub_shape"
        android:focusable="false"
        android:gravity="center"
        android:text="0" />

    <TextView
        android:id="@+id/add"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@drawable/add_sub_shape"

        android:gravity="center"
        android:text="+"
        android:textSize="25sp" />

</LinearLayout>

drawable---- shap

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">

    <size
        android:width="100dp"
        android:height="30dp" />
    <stroke
        android:width="1dp"
        android:color="#999999" />

</shape>

通用适配器

*BaseAdapter适配器
*
/*
public class MyBaseAdapter extends BaseAdapter {
    private Context context;
    private List<Datas>list;
    
    public MyBaseAdapter(Context context, List<Datas> list) {
        super();
        this.context = context;
        this.list = list;
    }
    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return list.size();
    }
    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return list.get(position);
    }
    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder = null;
        if(convertView ==null){
            holder = new ViewHolder();
            convertView = View.inflate(context, R.layout.list_item, null);
            holder.imageView = (ImageView) convertView.findViewById(R.id.image_show);
            holder.tv1 = (TextView) convertView.findViewById(R.id.tv_title);
            holder.tv2 = (TextView) convertView.findViewById(R.id.tv_source);
            holder.tv3 = (TextView) convertView.findViewById(R.id.tv_number);
            convertView.setTag(holder);
        }else{
             holder = (ViewHolder) convertView.getTag();
        }
        holder.tv1.setText(list.get(position).title);
        holder.tv2.setText(list.get(position).source);
        holder.tv3.setText(list.get(position).number);
        return convertView;
    }
class ViewHolder{
    ImageView imageView;
    TextView tv1,tv2,tv3;
}