对 Map<String, String> 的 List 进行排序 [英] sorting a List of Map&lt;String, String&gt;

问题描述

我有一个像这样创建的列表变量:

I have a list variable created like this:

List>list = new ArrayList();

在我的 Android 应用程序中，此列表被填充.

In my Android application, this list gets populated.

举个例子:

Map<String, String> map1 = new HashMap<String, String>();
map.put("name", "Josh");
...

Map<String, String> map2 = new HashMap<String, String>();
map.put("name", "Anna");
...

Map<String, String> map3 = new HashMap<String, String>();
map.put("name", "Bernie");
...

list.add(map1);
list.add(map2);
list.add(map3);

我使用 list 通过扩展 BaseAdapter 并实现各种方法在 ListView 中显示结果.

I am using list to show results in a ListView by extending BaseAdapter and implementing the various methods.

我的问题:我需要根据地图的键 name

My problem: I need to sort list in alphabetical order based on the map's key name

问题:根据地图的键 name 按字母顺序对 list 进行排序的简单方法是什么?

Question: What is a simple way to sort list in alphabetical order based on the map's key name?

我似乎无法理解这一点.我已经将每个 Map 中的每个 name 提取到一个 String 数组中，并对其进行了排序(Arrays.sort(strArray);).但这不会保留每个 Map 中的其他数据，所以我不太确定如何保留其他映射值

I can't seem to wrap my head around this. I have extracted each name from each Map into a String array, and sorted it(Arrays.sort(strArray);). But that doesn't preserve the other data in each Map, so i'm not too sure how i can preserve the other mapped values

推荐答案

以下代码完美运行

public Comparator<Map<String, String>> mapComparator = new Comparator<Map<String, String>>() {
    public int compare(Map<String, String> m1, Map<String, String> m2) {
        return m1.get("name").compareTo(m2.get("name"));
    }
}

Collections.sort(list, mapComparator);

但您的地图可能应该是特定类的实例.

But your maps should probably be instances of a specific class.

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