ExpandableListView 数组列表不会保持我放置它们的顺序

Question

我正在使用 ExpandableListView，我在数组列表中设置了一些列表。
我将它们设置为特定顺序，即：

company, day of the week, posh vehicles, topgear vehicles

但无论我做什么，订单都会恢复为

posh vehicles, company, days of the week, topgear vehicles

任何人都可以帮我弄清楚这里的问题是我用于 stringArray 的代码吗？

 public static HashMap<String, List<String>> getData() {

    HashMap<String, List<String>> expandableListDetail = new HashMap<String, List<String>>();

    List<String> listDataHeader = new ArrayList<String>();
    // Adding child data
    listDataHeader.add("Company");
    listDataHeader.add("Please pick a day");
    listDataHeader.add("Posh Vehicles");
    listDataHeader.add("TopGear Vehicles");

    List<String> CompanyName = new ArrayList<>();
    CompanyName.add("Posh limos");
    CompanyName.add("TopGear limos");

    List<String> daysOftheWeek = new ArrayList<>();
    daysOftheWeek.add("Monday");
    daysOftheWeek.add("Tuesday");
    daysOftheWeek.add("Wednesday");
    daysOftheWeek.add("Thursday");
    daysOftheWeek.add("Thursday");
    daysOftheWeek.add("Friday");
    daysOftheWeek.add("Saturday");
    daysOftheWeek.add("Sunday");

    List<String> poshvehicles = new ArrayList<>();
    poshvehicles.add("Posh H2 limo");
    poshvehicles.add("Iveco party bus");
    poshvehicles.add("Merc party bus ");
    poshvehicles.add("Party coach");

    List<String> topGearVehicles = new ArrayList<>();
    topGearVehicles.add("TopGear H2 limo");
    topGearVehicles.add("TopGear party bus");

    expandableListDetail.put(listDataHeader.get(0),CompanyName);
    expandableListDetail.put(listDataHeader.get(1),daysOftheWeek);
    expandableListDetail.put(listDataHeader.get(2),poshvehicles);
    expandableListDetail.put(listDataHeader.get(3),topGearVehicles);

    return expandableListDetail;

Answer 1

HashMap 没有保持插入顺序。

您可以改用 LinkedHashMap（扩展 HashMap）：

Map<String, List<String>> expandableListDetail = new LinkedHashMap<>();

我还使用了左侧的接口名称 Map 和菱形运算符 (<>)，如果你至少有 Java 7.

ExpandableListView 数组列表不会保持我放置它们的顺序

ExpandableListView array lists won't stay in the order I put them

java

android

arraylist

hashmap

expandablelistview