ExpandableListView数组列表不会按照我放它们的顺序[重复]

Question

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

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

谁能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不保留插入顺序。

您可以使用LinkedHashMap（它扩展了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(<>)，如果您至少有Java7就可以使用该运算符。