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Android 使用Eventbus实现购物车的价格单价数量的实

Android 使用Eventbus实现购物车的价格单价数量的实

作者: 总会颠沛流离 | 来源:发表于2019-11-01 15:04 被阅读0次

90后的我面临着的压力有很多，没房没车还没有存款，想要往上爬 ，但是又迷茫。我真的只是一个普通的不能再普通的男孩，一个普通的家庭，普通的父母。在一个不出名的二线城市里生活着，做着每天都一样的工作，每个月拿着固定工资。但是这对于我父母来说是很满意的 他们不需要我有多大的能力，只要有安稳的工作生活就够了。拿到手的工资真的是自己一个月纯收入，因为也不用担心付房租水电费。但是这些钱可能仅仅只够我一个月的生活费。每个月拿到工资没几天就开始还花呗，然后又开始期待月底发工资，开始倒计时。所以对于我一个90后的男孩子来说每月固定的工资压根就存不了钱，更加做不了什么大的消费。父母经常跟我讨论存钱的事，其实我很想跟他们说并不是我不想，只是每个月算来算去的开销还是少不了。慢慢的，我开始有了经济方面的压力，也开始思考如何才能找到适合自己的副业。人在一个安逸的环境中待久了，慢慢的会产生惰性。我就是这样，每次都是想的比较多，但是付出的行动比较少。

效果图： 超级截屏_20191101_144400.png

第一步: 加入依赖

//Eventbus依赖
implementation 'org.greenrobot:eventbus:3.0.0'

第一步：MainActivity

/**
 * @Author: 
 * @Date: 2019/11/1 14:50
 * @Description:
 */
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
/**
 * 全选
 */
private CheckBox mCbAll;
/**
 * 22
 */
private TextView mTotalPrice;
/**
 * 22
 */
private TextView mTotalNum;
private ExpandableListView mElv;

private List<GroupBean> groupList = new ArrayList<>();
private List<List<ChildBean>> childList = new ArrayList<>();
private MyAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    EventBus.getDefault().register(this);
    initView();
    initDate();
    mElv.setGroupIndicator(null);
    adapter = new MyAdapter(this, groupList, childList);
    mElv.setAdapter(adapter);
    for (int i = 0; i <groupList.size() ; i++) {
        mElv.expandGroup(i);
    }


}

@Subscribe
public void moneyCount(MCEvent mcEvent){
    int money = mcEvent.getMoney();
    int count = mcEvent.getCount();
    mTotalNum.setText(count+"");
    mTotalPrice.setText(money+"");
}
@Subscribe
public void messageEvent(MsgEvent msg) {
    mCbAll.setChecked(msg.isFlag());
}
@Override
protected void onDestroy() {
    super.onDestroy();
    EventBus.getDefault().unregister(this);
}

private void initDate() {
    for (int i = 0; i < 3; i++) {
        GroupBean groupBean = new GroupBean(false, "商家" + i);
        groupList.add(groupBean);
        List<ChildBean> list = new ArrayList<>();
        for (int j = 0; j < 2; j++) {
            ChildBean childBean = new ChildBean("商品" + i, 1 + i, false);
            list.add(childBean);
        }
        childList.add(list);
    }
}

private void initView() {
    mCbAll = (CheckBox) findViewById(R.id.cb_all);
    mCbAll.setOnClickListener(this);
    mTotalPrice = (TextView) findViewById(R.id.totalPrice);
    mTotalNum = (TextView) findViewById(R.id.totalNum);
    mElv = (ExpandableListView) findViewById(R.id.elv);
}

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.cb_all:
            adapter.allChecked(mCbAll.isChecked());
            break;
    }

    }

    }

第二步：

 /**
 * @Author: 
 * @Date: 2019/11/1 14:50
 * @Description:
 */public class MyAdapter extends BaseExpandableListAdapter {
private Context context;
private List<GroupBean> groupList;
private List<List<ChildBean>> childList;
private int count;
private int sumMoney;

public MyAdapter(Context context, List<GroupBean> groupList, List<List<ChildBean>> childList) {
    this.context = context;
    this.groupList = groupList;
    this.childList = childList;
}

@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(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    GroupViewHolder holder;
    if (convertView == null) {
        holder = new GroupViewHolder();
        convertView = View.inflate(context, R.layout.groupitem, null);
        holder.cb = convertView.findViewById(R.id.cb);
        holder.tvName = convertView.findViewById(R.id.tvName);
        convertView.setTag(holder);
    } else {

        holder = (GroupViewHolder) convertView.getTag();
    }
    //赋值
    GroupBean groupBean = groupList.get(groupPosition);
    holder.cb.setChecked(groupBean.isChecked());
    holder.tvName.setText(groupBean.getGroupName());
    //给group设置点击事件
    holder.cb.setOnClickListener(new GroupCbOnClickListener(groupPosition));

    return convertView;
}

@Override
public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
    ChildViewHolder holder;
    if (convertView == null) {
        holder = new ChildViewHolder();
        convertView = View.inflate(context, R.layout.childitem, null);
        holder.cb = convertView.findViewById(R.id.cb);
        holder.tvName = convertView.findViewById(R.id.tvName);
        holder.tvPrice = convertView.findViewById(R.id.tvPrice);
        convertView.setTag(holder);
    } else {
        holder = (ChildViewHolder) convertView.getTag();
    }
    //赋值
    ChildBean childBean = childList.get(groupPosition).get(childPosition);
    holder.cb.setChecked(childBean.isChecked());
    holder.tvName.setText(childBean.getChildName());
    holder.tvPrice.setText(childBean.getPrice() + "");
    //设置点击事件Child
    holder.cb.setOnClickListener(new ChildCbOnClickListener(groupPosition,childPosition));
    return convertView;
}

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

class GroupViewHolder {
    CheckBox cb;
    TextView tvName;
}

class ChildViewHolder {
    CheckBox cb;
    TextView tvName;
    TextView tvPrice;
}

class ChildCbOnClickListener implements View.OnClickListener {

    private int groupPosition;
    private int childPosition;

    public ChildCbOnClickListener(int groupPosition, int childPosition) {
        this.groupPosition = groupPosition;
        this.childPosition = childPosition;
    }

    @Override
    public void onClick(View v) {
        if (v instanceof CheckBox) {
            CheckBox cb = (CheckBox) v;
            List<ChildBean> childBeen = childList.get(groupPosition);
            ChildBean childBean = childBeen.get(childPosition);
            childBean.setChecked(cb.isChecked());
            //计算选中的商品数，并发送到主界面进行显示
            MCEvent mcEvent = new MCEvent();
            mcEvent.setCount(totalCount());
            mcEvent.setMoney(totalPrice());
            EventBus.getDefault().post(mcEvent);
            //判断商家所有的商品的checkbox是否选中
            if (isChildChecked(childBeen)) {
                groupList.get(groupPosition).setChecked(true);
                MsgEvent msgEvent = new MsgEvent();
                msgEvent.setFlag(isGroupChecked());
                EventBus.getDefault().post(msgEvent);
                notifyDataSetChanged();

            } else {
                groupList.get(groupPosition).setChecked(false);
                MsgEvent msgEvent = new MsgEvent();
                msgEvent.setFlag(false);
                msgEvent.setFlag(isGroupChecked());
                EventBus.getDefault().post(msgEvent);
                notifyDataSetChanged();
            }
        }
    }

}
/**
 * 判断所有商家的所有商品的checkbox是否都选中
 *
 * @param childBean
 * @return
 */
private boolean isChildChecked(List<ChildBean> childBean) {

    for (int i = 0; i < childBean.size(); i++) {
        ChildBean childBean1 = childBean.get(i);
        if (!childBean1.isChecked()) {
            return false;
        }
    }
    return true;
}


class GroupCbOnClickListener implements View.OnClickListener {

    private int groupPosition;

    public GroupCbOnClickListener(int groupPosition) {
        this.groupPosition = groupPosition;
    }

    @Override
    public void onClick(View v) {
        if (v instanceof CheckBox){
            CheckBox cb= (CheckBox) v;
            //根据cb.isChecked()是否选中，给一级列的checkbox改变状态
            groupList.get(groupPosition).setChecked(cb.isChecked());
            List<ChildBean> childBeenList = childList.get(groupPosition);
            for (ChildBean childBean : childBeenList){
                childBean.setChecked(cb.isChecked());
            }
            //计算选中的商品数和金额，并发送到主界面进行显示
            MCEvent mcEvent = new MCEvent();
            mcEvent.setCount(totalCount());
            mcEvent.setMoney(totalPrice());
            EventBus.getDefault().post(mcEvent);

            MsgEvent msgEvent = new MsgEvent();
            msgEvent.setFlag(isGroupChecked());
            EventBus.getDefault().post(msgEvent);
            notifyDataSetChanged();
        }
    }
}

/**
 * 判断其他商家是否选中
 * @return
 */
private boolean isGroupChecked() {
    for (GroupBean groupBean : groupList) {
        if (!groupBean.isChecked()){
            return false;
        }
    }
    return true;
}

//主界面全选框选中状态
public void allChecked(boolean bool) {
    for (int i = 0; i < groupList.size(); i++) {
        groupList.get(i).setChecked(bool);
        for (int j = 0; j < childList.get(i).size(); j++) {
            childList.get(i).get(j).setChecked(bool);
        }
    }
    //计算选中的商品数，发送到主界面进行显示
    MCEvent mcEvent = new MCEvent();
    mcEvent.setCount(totalCount());
    mcEvent.setMoney(totalPrice());
    EventBus.getDefault().post(mcEvent);
    notifyDataSetChanged();

}

/**
 * 计算商品总价格
 *
 * @return
 */
private int totalPrice() {
    sumMoney = 0;
    for (int i = 0; i < groupList.size(); i++) {
        for (int j = 0; j < childList.get(i).size(); j++) {
            if (childList.get(i).get(j).isChecked()) {
                int price = childList.get(i).get(j).getPrice();
                sumMoney += price;
            }
        }
    }
    return sumMoney;
}

/**
 * 计算商品的总数量
 *
 * @return
 */
private int totalCount() {
    count = 0;
    for (int i = 0; i < groupList.size(); i++) {
        for (int j = 0; j < childList.get(i).size(); j++) {
            if (childList.get(i).get(j).isChecked()) {
                //遍历所有商品，只要是选中状态的，就加1
                count++;
            }
        }
    }
    return count;
}


  }

第三步：

/**
 * @Author: 、
 * @Date:  14:50
 * @Description: 2531295581
 */
public class MsgEvent {
    private boolean flag;

    public boolean isFlag() {
        return flag;
    }

    public void setFlag(boolean flag) {
        this.flag = flag;
    }
}

第四步：MCEvent

 /**
* @Author: 
 * @Date: 2019/11/1 14:51
* @Description: 2531295581
*/
public class MCEvent {
private int money;
private int count;

public int getMoney() {
    return money;
}

public void setMoney(int money) {
    this.money = money;
}

public int getCount() {
    return count;
}

public void setCount(int count) {
    this.count = count;
}
}

第五步：GroupBean

 /**
 * @Author: 薛志辉
 * @Date: 2019/11/1 14:51
 * @Description:
 */
  public class GroupBean {
private boolean checked;
private String groupName;

public GroupBean(boolean checked, String groupName) {
    this.checked = checked;
    this.groupName = groupName;
}

public boolean isChecked() {
    return checked;
}

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

public String getGroupName() {
    return groupName;
}

public void setGroupName(String groupName) {
    this.groupName = groupName;
}
}

第六步：ChildBean

   /**
   * @Author: 
   * @Date: 2019/11/1 14:51
   * @Description:
   */
  public class ChildBean {
private String childName;
private int price;
private boolean checked;

public ChildBean(String childName, int price, boolean checked) {
    this.childName = childName;
    this.price = price;
    this.checked = checked;
}

public String getChildName() {
    return childName;
}

public void setChildName(String childName) {
    this.childName = childName;
}

public int getPrice() {
    return price;
}

public void setPrice(int price) {
    this.price = price;
}

public boolean isChecked() {
    return checked;
}

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

最后一步 配置的资源

activity_main.xml
 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
>

<LinearLayout
    android:id="@+id/ll"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:orientation="horizontal">

    <CheckBox
        android:id="@+id/cb_all"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:text="全选" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="20dp"
        android:gravity="center_vertical"
        android:text="合计:" />

    <TextView
        android:id="@+id/totalPrice"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="10dp"
        android:gravity="center_vertical"
        android:text="22" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="30dp"
        android:gravity="center_vertical"
        android:text="数量" />

    <TextView
        android:id="@+id/totalNum"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_marginLeft="10dp"
        android:gravity="center_vertical"
        android:text="22" />
</LinearLayout>

<ExpandableListView
    android:id="@+id/elv"
    android:layout_above="@id/ll"
    android:layout_width="match_parent"
    android:layout_height="match_parent"></ExpandableListView>

</RelativeLayout>
childitem.xml
  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#330000ff"
android:paddingLeft="20dp"
android:gravity="center_vertical"
android:orientation="horizontal">

<CheckBox
    android:id="@+id/cb"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tvName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp" />

<TextView
    android:id="@+id/tvPrice"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="60dp" />

  </LinearLayout>

groupitem.xml

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="#330000ff"
android:gravity="center_vertical"
android:orientation="horizontal">

<CheckBox
    android:id="@+id/cb"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<TextView
    android:id="@+id/tvName"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="5dp" />

  </LinearLayout>
image.png
ok 到此结束 githup ： https://github.com/xuezhihuixzh/shopp.git

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