购物车简单实现

导入依赖
compile 'com.squareup.okhttp3:okhttp:3.9.0'
compile 'com.squareup.okhttp3:logging-interceptor:3.9.0'
compile 'com.google.code.gson:gson:2.8.2'
compile 'com.nostra13.universalimageloader:universal-image-loader:1.9.5'
compile 'org.greenrobot:eventbus:3.1.1'
}

创建adpter
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_tel);
        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);
            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();
}

}
判断全选反选方法
public class MessageEvent {
private boolean checked;

public boolean isChecked() {
    return checked;
}

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

}
传值定义方法
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;
}

}
model方法
public interface IMainModel {
public void getGoods(OnNetListener<GoosBean> onNetListener);
}
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() {
        @Override
        public void onFailure(Call call, IOException e) {

        }

        @Override
        public 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() {
                @Override
                public void run() {
                    onNetListener.onSuccess(goosBean);
                }
            });
        }
    });
}

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

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

public void onFailure(Exception e);

}
presenter方法
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>() {
        @Override
        public void onSuccess(GoosBean goosBean) {
            //List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList
            List<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);
        }

        @Override
        public void onFailure(Exception e) {

        }
    });

}

}

public interface IMainActivity {
public void showList(List<GoosBean.DataBean> groupList, List<List<GoosBean.DataBean.DatasBean>> childList);
}
public class MainActivity extends AppCompatActivity implements IMainActivity {

private ExpandableListView mElv;
private CheckBox mCheckbox2;
/**
 * 0
 */
private TextView mTvPrice;
/**
 * 结算(0)
 */
private TextView mTvNum;
private MyAdapter adapter;

@Override
protected 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() {
        @Override
        public void onClick(View v) {
            adapter.changeAllListCbState(mCheckbox2.isChecked());
        }
    });
}

@Override
protected 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);
}

@Override
public 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);
    }
}

@Subscribe
public void onMessageEvent(MessageEvent event) {
    mCheckbox2.setChecked(event.isChecked());
}

@Subscribe
public void onMessageEvent(PriceAndCountEvent event) {
    mTvNum.setText("结算(" + event.getCount() + ")");
    mTvPrice.setText(event.getPrice() + "");
}

}
布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="mvpframework.bwie.com.a1509agoodcart.view.MainActivity">

<TextView
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:background="#990000ff"
    android:gravity="center"
    android:text="购物车"
    android:textColor="#ff3660"
    android:textSize="25sp" />

<ExpandableListView
    android:id="@+id/elv"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_weight="1" />

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_alignParentBottom="true"
    android:background="@android:color/white"
    android:gravity="center_vertical">

    <CheckBox
        android:id="@+id/checkbox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:focusable="false" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dp"
        android:layout_toRightOf="@+id/checkbox2"
        android:gravity="center_vertical"
        android:text="全选"
        android:textSize="20sp" />

    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:orientation="horizontal">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:text="合计 :" />


        <TextView
            android:id="@+id/tv_price"
            android:layout_width="wrap_content"
            android:layout_height="50dp"
            android:layout_marginLeft="10dp"
            android:paddingRight="10dp"
            android:text="0"
            android:textColor="@android:color/holo_red_light" />


        <TextView
            android:id="@+id/tv_num"
            android:layout_width="wrap_content"
            android:layout_height="50dp"
            android:background="@android:color/holo_red_dark"
            android:gravity="center"
            android:padding="10dp"
            android:text="结算(0)"
            android:textColor="@android:color/white" />
    </LinearLayout>
</RelativeLayout>

</LinearLayout>
全选反选
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray"
android:gravity="center_vertical"
android:orientation="horizontal">

<CheckBox

    android:id="@+id/cb_child"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="30dp"
    android:layout_marginLeft="40dp"
    android:layout_marginTop="30dp"
    android:focusable="false" />

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

    <TextView
        android:id="@+id/tv_tel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:text="iphone6" />

    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:text="什么手机" />

    <TextView
        android:id="@+id/tv_time"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:text="2016-12-10" />
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_pri"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:text="¥3000.00" />

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

        <ImageView
            android:id="@+id/iv_del"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:src="@drawable/shopcart_minus_grey" />

        <TextView
            android:id="@+id/tv_num"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:background="@drawable/shopcart_add_btn"
            android:paddingBottom="2dp"
            android:paddingLeft="20dp"
            android:paddingRight="20dp"
            android:paddingTop="2dp"
            android:text="1" />

        <ImageView
            android:id="@+id/iv_add"
            android:layout_width="20dp"
            android:layout_height="20dp"
            android:layout_marginLeft="5dp"
            android:src="@drawable/shopcart_add_red" />

    </LinearLayout>

</LinearLayout>

<TextView
    android:id="@+id/tv_del"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="删除" />

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

<CheckBox
    android:id="@+id/cb_parent"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="30dp"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="30dp"
    android:focusable="false" />

<TextView
    android:id="@+id/tv_sign"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:text="标记" />

<TextView
    android:id="@+id/tv_number"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:text="12345678" />

</LinearLayout>

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