Question

在我的应用程序中，我尝试在 listView 中按按字母顺序顺序对名称进行排序.Got从本地数据库成功获取值。可能我知道什么是实现目标的正确方法是什么？我找不到合适的解决方案。请帮帮我。

我的代码在

下面

// Declare this 
ArrayList < HashMap < String, Object >> Results;
ArrayList < HashMap < String, Object >> ValuesSpeciality;
public CustomAdapterSpecialityActivity adapterCustom;


//get speciality list from local db and show on listview
public void SpecialitiesOnList() {
    HashMap < String, Object > temp;
    List < TaxonomyObjects > contacts = db.getAllTaxonomy();

    for (TaxonomyObjects cn: contacts) {
        temp = new HashMap < String, Object > ();
        temp.put("provider", "" + cn.getDisplayName());
        temp.put("tvTaxonomyCode", "" + cn.getTaxonomyCode());
        System.out.println(temp);
        ValuesSpeciality.add(temp);
    }

    //searchResults=originalValuesSpeciality initially
    Results = new ArrayList < HashMap < String, Object >> (ValuesSpeciality);

    adapterCustom = new CustomAdapterSpecialityActivity(this, R.layout.list_item_service, searchResults);
    lv.setAdapter(adapterCustom);
    adapterCustom.notifyDataSetChanged();

    for (int i = 0; i < adapterCustom.getCount(); i++) {
        HashMap < String, Object > hm = (HashMap < String, Object > ) adapterCustom.getItem(i);

        hm.put("position", i);

    }
}

结果我的Logcat显示了这个

{Code=204D00000X, provider=Neuromusculoskeletal Medicine & OMM}  
 {Code=204F00000X, provider=Transplant Surgery}
 {Code=204R00000X, provider=Electrodiagnostic Medicine}
 {Code=207K00000X, provider=Allergy & Immunology}
 {Code=204E00000X, provider=Oral & Maxillofacial Surgery}

我尝试显示提供商名称Alphabetically订单。

Answer 1

使用此代码 ...

private static HashMap sortByValues(HashMap map) { 

       List list = new LinkedList(map.entrySet());

       // Defined Custom Comparator here
       Collections.sort(list, new Comparator() {

            public int compare(Object o1, Object o2) {

               return ((Comparable) ((Map.Entry) (o1)).getValue())
                  .compareTo(((Map.Entry) (o2)).getValue());
            }
       });

       // Here I am copying the sorted list in HashMap
       // using LinkedHashMap to preserve the insertion order

     HashMap sortedHashMap = new LinkedHashMap();

       for (Iterator it = list.iterator(); it.hasNext();) {

              Map.Entry entry = (Map.Entry) it.next();

              sortedHashMap.put(entry.getKey(), entry.getValue());
       } 
       return sortedHashMap;
  }

Answer 2

如果您使用的是本地数据库，那么您可以在TEXT字段上轻松使用order by，这将得到结果并使用LinkedHashMap代替HashMap，您的问题将很容易解决

在Android中按字母顺序排序类型的Hashmap值

2 个答案: