统计订单：复选+全选+计算 的列表

话不多说，先上效果图。带选择框和全选按钮的列表，因一些特殊要求还加上些计算功能，这并不是难就是稍微繁琐了些，如 “统计订单功能”

不要说，就是干，那就直接上代码

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• 1，主页面的布局文件activity_test7.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="match_parent"
    android:background="@color/colorWhite"
    android:orientation="vertical">

    <ListView
        android:id="@+id/lv_list"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:scrollbars="none"
        android:dividerHeight="0.1dp"
        android:clickable="true" />

    <LinearLayout android:id="@+id/ll_bottom"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:gravity="center_vertical"
        android:layout_alignParentBottom="true"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/iv_select"
            android:layout_width="23dp"
            android:layout_height="23dp"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="10dp"
            android:src="@mipmap/gc2_04" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全选"
            android:layout_marginRight="10dp"
            android:textColor="#7d7d80"
            android:textSize="14sp" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="总金额："
            android:textColor="#000000"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tv_allMoney"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="¥ 0.00"
            android:textColor="#ff0000"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tv_apply"
            android:layout_width="110dp"
            android:layout_height="match_parent"
            android:text="提 交"
            android:textColor="@color/colorWhite"
            android:gravity="center"
            android:background="#ff0000"
            android:textSize="17sp" />
    </LinearLayout>
</LinearLayout>

• 2，接下来到Activity代码，基本上都有注释的不多说了

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.administrator.pagertest.adapter.InvoiceApplyAdapter;
import com.example.administrator.pagertest.model.InvoiceApplyBean;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.List;

public class TestCheckActivity extends Activity implements AdapterView.OnItemClickListener,View.OnClickListener {
    //自己搞来些假数据
    private String resultJosn = "[\n" +
            "      {\n" +
            "        \"id\": \"1\",\n" +
            "        \"name\": \"购买门票\",\n" +
            "        \"money\": \"124.00\",\n" +
            "        \"ordernum\": \"1526979933006\",\n" +
            "        \"time\": \"2018年6月01日\"\n" +
            "      },\n" +
            "      {\n" +
            "        \"id\": \"2\",\n" +
            "        \"name\": \"购买食物\",\n" +
            "        \"money\": \"102.00\",\n" +
            "        \"ordernum\": \"1526979435086\",\n" +
            "        \"time\": \"2018年6月01日\"\n" +
            "      },\n" +
            "      {\n" +
            "        \"id\": \"3\",\n" +
            "        \"name\": \"购买特产\",\n" +
            "        \"money\": \"1100.00\",\n" +
            "        \"ordernum\": \"1526979935036\",\n" +
            "        \"time\": \"2018年6月01日\"\n" +
            "      }\n" +
            "]";

    private List<InvoiceApplyBean> mListData = new ArrayList<>();//数据源
    private List<InvoiceApplyBean> mList;

    private LinearLayout ll_bottom;
    private ImageView iv_select;
    private TextView tv_allMoney;
    private TextView tv_apply;
    private ListView lv_ListView;

    private InvoiceApplyAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test7);

        initView();
    }

    //初始化控件
    private void initView() {
        ll_bottom = (LinearLayout)findViewById(R.id.ll_bottom);
        iv_select = (ImageView)findViewById(R.id.iv_select);
        tv_allMoney = (TextView)findViewById(R.id.tv_allMoney);
        tv_apply = (TextView)findViewById(R.id.tv_apply);
        lv_ListView = (ListView)findViewById(R.id.lv_list);

        adapter = new InvoiceApplyAdapter(this, mListData);
        lv_ListView.setAdapter(adapter);

        lv_ListView.setOnItemClickListener(this);
        ll_bottom.setOnClickListener(this);
        tv_apply.setOnClickListener(this);

        initDate();
    }

    //解析数据
    private void initDate() {
        Gson gson = new Gson();//用Gson解析数据
        mList = gson.fromJson(resultJosn, new TypeToken<List<InvoiceApplyBean>>() {
        }.getType());
        mListData.addAll(mList);

        adapter.notifyDataSetChanged();
    }

    private boolean isAllCheck = false;//一个判断是否全选的标记
    //用BigDecimal这个类想大家都才到原因了，防止计算过程中出现精度亏损
    private BigDecimal bignum1 = new BigDecimal("0.00");//总金额的默认值，注意尽量传入字符串类型，而非数值型
    private BigDecimal bignum2;

    @Override
    public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
        if (position >= 0 && position <= mListData.size()){
            if (mListData.get(position).getFlag()==0){//如果点击项是 选中状态，将变成 不选中状态，金额相加
                mListData.get(position).setFlag(1);
                bignum2 = new BigDecimal(mListData.get(position).getMoney());
                bignum1 = bignum1.add(bignum2);//金额相加
            }else if (mListData.get(position).getFlag()==1){//如果点击项是 不选中状态，将变成 选中状态，金额相减
                mListData.get(position).setFlag(0);
                bignum2 = new BigDecimal(mListData.get(position).getMoney());
                bignum1 = bignum1.subtract(bignum2);//金额相减
            }

            tv_allMoney.setText("¥ "+bignum1);//设置显示价格

            //遍历处理全选按钮。这样写功能上是可以实现的，但效率不是很好
            for (int i=0; i < mListData.size(); i++){
                if (mListData.get(i).getFlag()==1){
                    isAllCheck = true;
                    iv_select.setImageResource(R.mipmap.check2_15);
                }
                if (mListData.get(i).getFlag()==0){//遍历所有数据，如果有一个未选上，全选按钮都是默认没选上状态
                    isAllCheck = false;
                    iv_select.setImageResource(R.mipmap.gc2_04);
                    break;//这句break代码很关键
                }
            }
            adapter.notifyDataSetChanged();
        }
    }

    @Override
    public void onClick(View view) {
        switch (view.getId()) {
            case R.id.ll_bottom://全选按钮
                bignum1 = new BigDecimal("0.00");
                if (!isAllCheck) {//全选
                    isAllCheck = true;
                    iv_select.setImageResource(R.mipmap.check2_15);
                    for (int i = 0; i < mListData.size(); i++) {
                        mListData.get(i).setFlag(1);
                        bignum2 = new BigDecimal(mListData.get(i).getMoney());
                        bignum1 = bignum1.add(bignum2);
                    }
                    tv_allMoney.setText("¥ " + bignum1);
                    adapter.notifyDataSetChanged();
                } else {//全不选
                    isAllCheck = false;
                    iv_select.setImageResource(R.mipmap.gc2_04);
                    for (int i = 0; i < mListData.size(); i++) {
                        mListData.get(i).setFlag(0);
                        bignum2 = new BigDecimal(mListData.get(i).getMoney());
                        bignum1 = bignum1.subtract(bignum2);
                    }
                    //防止金额少于0
                    if (bignum1.doubleValue() >= 0) {
                        tv_allMoney.setText("¥ " + bignum1);
                    } else {
                        bignum1 = new BigDecimal("0.00");
                        tv_allMoney.setText("¥ " + bignum1);
                    }
                    adapter.notifyDataSetChanged();
                }
                break;
            case R.id.tv_apply://提交
                Toast.makeText(getApplicationContext(),""+bignum1,Toast.LENGTH_SHORT).show();
                break;
        }
    }
}

• 3，里面用到的Javabean类， InvoiceApplyBean.java

public class InvoiceApplyBean {
    private String id;
    private String name;
    private String money;
    private String ordernum;
    private String time;
    private int flag = 0;

    public int getFlag() {
        return flag;
    }

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

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMoney() {
        return money;
    }

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

    public String getOrdernum() {
        return ordernum;
    }

    public void setOrdernum(String ordernum) {
        this.ordernum = ordernum;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }
}

• 4，适配器InvoiceApplyAdapter.java

public class InvoiceApplyAdapter extends BaseAdapter {
    private Context mContext;
    private LayoutInflater lInflater;
    private List<InvoiceApplyBean> list = new ArrayList<>();

    public InvoiceApplyAdapter(Context mContext, List<InvoiceApplyBean> list) {
        this.mContext = mContext;
        this.list = list;
        if (mContext != null) {
            lInflater = LayoutInflater.from(mContext);
        }
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolder holder;
        if (view == null) {
            holder = new ViewHolder();
            view = lInflater.inflate(R.layout.invoice_apply_item, null);

            holder.iv_select = (ImageView) view.findViewById(R.id.iv_select);
            holder.tv_title = (TextView) view.findViewById(R.id.tv_title);
            holder.tv_money = (TextView) view.findViewById(R.id.tv_money);
            holder.tv_number = (TextView) view.findViewById(R.id.tv_number);

            view.setTag(holder);
        } else {
            holder = (ViewHolder) view.getTag();
        }

        final InvoiceApplyBean bean = list.get(i);

        holder.tv_title.setText(bean.getName());
        holder.tv_money.setText("订单金额："+bean.getMoney()+"元  |  订单时间："+bean.getTime());
        holder.tv_number.setText("订单号："+bean.getOrdernum());

        if (bean.getFlag() == 0){
            holder.iv_select.setImageResource(R.mipmap.gc2_04);
        }else if (bean.getFlag() == 1){
            holder.iv_select.setImageResource(R.mipmap.check2_15);
        }
        return view;
    }

    static class ViewHolder {
        private ImageView iv_select;
        public TextView tv_title, tv_money, tv_number;
    }
}

• 5，子项的布局文件 invoice_apply_item.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="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    android:paddingTop="15dp"
    android:paddingBottom="15dp"
    android:paddingLeft="10dp"
    android:paddingRight="10dp">

    <ImageView
        android:id="@+id/iv_select"
        android:layout_width="23dp"
        android:layout_height="23dp"
        android:layout_marginRight="10dp"
        android:src="@mipmap/gc2_04" />

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

        <TextView
            android:id="@+id/tv_title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text=""
            android:textColor="#000000"
            android:textSize="15sp" />

        <TextView
            android:id="@+id/tv_money"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginBottom="8dp"
            android:layout_marginTop="8dp"
            android:text=""
            android:textColor="#000000"
            android:textSize="12sp" />

        <TextView
            android:id="@+id/tv_number"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text=""
            android:textColor="#7d7d80"
            android:textSize="12sp" />

    </LinearLayout>
</LinearLayout>

• 6，在gradle中添加 Gson 依赖

compile 'com.google.code.gson:gson:2.7'
compile 'com.google.code.gson:gson-parent:2.7'

• 7，各位老铁们，到这里就是全部代码了，最主要就是每次操作就遍历数据，做相应的改变即可。用到的gc2_04 、 check2_15着两个小图标就不传，这次的源码也不传了

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