java Android：如何订购 ArrayList<HashMap<String,String>>？
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Android: How to Order ArrayList<HashMap<String,String>>?
提问by Pattabi Raman
I'm saving details of product in a map and adding in ArrayList< HashMap< String,String >> and setting in to a custom list adapter. I need to sort the values by price in it. How to achieve it? Thanks in advance.
我将产品的详细信息保存在地图中并添加到 ArrayList< HashMap< String,String >> 并设置为自定义列表适配器。我需要按其中的价格对值进行排序。如何实现？提前致谢。
回答by Eldhose M Babu
Pleas use the code below :
请使用以下代码：
ArrayList< HashMap< String,String >> arrayList=populateArrayList();
Collections.sort(arrayList, new Comparator<HashMap< String,String >>() {
@Override
public int compare(HashMap<String, String> lhs,
HashMap<String, String> rhs) {
// Do your comparison logic here and retrn accordingly.
return 0;
}
});
回答by prayagupd
You can implement a Comparator<Map<String, String>>or Comparator<HashMap<String, String>>
您可以实施一个Comparator<Map<String, String>>或Comparator<HashMap<String, String>>
How sort an ArrayList of HashMaps holding several key-value pairs each?answers it well :
如何对每个包含多个键值对的 HashMap 的 ArrayList 进行排序？回答得很好：
class MapComparator implements Comparator<Map<String, String>>{
private final String key;
public MapComparator(String key){
this.key = key;
}
public int compare(Map<String, String> first,
Map<String, String> second){
// TODO: Null checking, both for maps and values
String firstValue = first.get(key);
String secondValue = second.get(key);
return firstValue.compareTo(secondValue);
}
}
...
Collections.sort(arrayListHashMap, new MapComparator("value"));
Also look at How to sort a Map on the values in Java?
回答by Anuj
you can simply use this for your custom Sorting of objects in an Array List,
您可以简单地将其用于自定义数组列表中的对象排序，
public class MyComparator implements Comparator<MyObject> {
@Override
public int compare(MyObject o1, MyObject o2) {
return o1.getYOUROBJ1STR.compareTo(o2.getYOUROBJ2STR);
}
}
Let me know if you still face issues for sorting of Map
如果您仍然面临 Map 排序问题，请告诉我
回答by Zoombie
回答by Hunter
I think you are searching for this:-
我想你正在寻找这个：-
Sort ArrayList of custom Objects by property
sorting a List of Map<String, String>
Hope it will helps you...
希望它会帮助你...
