字符串列表＆LT;数组列表中的LT和增加值的字符串＆GT;＆GT;在HashMap中的Andr​​oid [英] add the value in Arraylist<string,List<String>> in hashmap android

问题描述

我要获取数据的LIS。

I have to fetch the lis of data.

所以我必须使用字符串list.here的ArrayList中如何我添加在地图上的价值。

So i have used the arraylist of string with list.here how can i add the value on map.

我用低于code：

       static final String KEY_TITLE = "Category";
         static final String KEY_ARTICLE = "article";
          static final String KEY_IMAGE = "image";


 final ArrayList<HashMap<String,  List<String>>> songsList = new ArrayList<HashMap<String,  List<String>>>();
        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML from URL
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_TITLE);
        NodeList nl1 = doc.getElementsByTagName(KEY_ARTICLE);
        NodeList nl2 = doc.getElementsByTagName(KEY_IMAGE);
        System.out.println(nl.getLength());
        for (int i = 0; i < nl.getLength(); i++) {
           //System.out.println(nl.getLength());
            HashMap<String, List<String>> map = new HashMap<String, List<String>>();
            map.put( KEY_TITLE,((Element)nl.item(i)).getAttribute("name"));
           for (int j = 0; j < nl1.getLength(); j++) {
              map.put( KEY_ARTICLE,((Element)nl1.item(j)).getAttribute("title"));
              map.put( KEY_IMAGE,((Element)nl2.item(j)).getAttribute("url"));
             }
           songsList.add(map);
          }

下面我得到这些提示以下错误：（map.put（KEY_TITLE，（（元）nl.item（I））的getAttribute（名字））;。）行：

Here am getting the below error on these (map.put( KEY_TITLE,((Element)nl.item(i)).getAttribute("name"));) line:

The method put(String, List<String>) in the type HashMap<String,List<String>> is not applicable for the arguments (String, String)

我怎样才能清除这些错误..pls我提供的解决方案来...

How can i clear these error ..pls provide me solution for these ...

推荐答案

在此行

 map.put( KEY_TITLE,((Element)nl.item(i)).getAttribute("name"));

要添加一个字符串，而不是列表

you are adding a single string to instead of List

您必须在这一点上创建的字符串列表，你的字符串添加到它，并在列表地图。

You have to create a List of String at that point and add your String to it and at the list to your map.

例如：

  List<String> myList= new ArrayList<String>();
  myList.add((Element)nl.item(i)).getAttribute("name"));
  map.put( KEY_TITLE,myList);

您有一个循环。我认为，我知道你想实现我会更新我的code什么。这可以帮助您避免覆盖地图输入

you have a loop. I think that i know what you want to achieve i'll update my code. This can help you avoiding overriding the map input

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

        for(int i = 0; i < nl.getLength(); i++) {
             String name = (Element) nl.item(i)).getAttribute("name");
             populateMap(map, name, KEY_TITLE);
            for(int j = 0; j < nl1.getLength(); j++) {
                String title=(Element) nl1.item(j)).getAttribute("title");
                populateMap(map, title, KEY_ARTICLE);

                String url=(Element) nl2.item(j)).getAttribute("url");
                populateMap(map, url, KEY_IMAGE);
            }
            songsList.add(map);
        }

方法populateMap（）

Method populateMap()

void populateMap(HashMap<String, List<String>> map, String value, String key) {
        List<String> myList;
        if(!map.containsKey(key)) {
            myList = new ArrayList<String>();
            myList.add(value);
            map.put(key, myList);
        } else {
            myList = map.get(key);
            myList.add(value);
        }
    }

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