如何添加子项在ListView [英] How to add subitems in a ListView

问题描述

我想在我的ListView添加子项目。
我的ListView应该为电子邮件项目和他们的子项的机构来组织，但有下列code我刚才添加的项目，我怎么可以加我的子项就可以了？我试过这么多的事情，但它不能正常工作。

 列表＆LT;登录与GT; listEmails = JsonUtil.getAllEmails（JSON）;        ArrayList的＆LT;串GT;电子邮件=新的ArrayList＆LT;串GT;（）;        ArrayList的＆LT;串GT;机构=新的ArrayList＆LT;串GT;（）;        对（登录loginObj：listEmails）{            emails.add（loginObj.getEmailAndress（））;
        }        对（登录loginObj：listEmails）{            institutions.add（loginObj.getInstitution（））;
        }        ArrayAdapter＆LT;串GT;适配器;        适配器=新ArrayAdapter＆LT;串GT;（这一点，android.R.layout.simple_list_item_1，电子邮件）;        emailListView.setAdapter（适配器）;
 

解决方案

要做到这一点，正确的方法是创建每个项目一个HashMap：看看下面的code：

 列表＆LT;登录与GT; listEmails = JsonUtil.getAllEmails（JSON）;                ArrayList的＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;名单=新的ArrayList＆LT;＆HashMap的LT;字符串，字符串＆GT;＆GT;（listEmails.size（））;                对（登录loginObj：listEmails）{                    HashMap的＆LT;字符串，字符串＆GT;项目=新的HashMap＆LT;字符串，字符串＆GT;（）;
                    item.put（电子邮件，loginObj.getEmailAndress（））;
                    item.put（机构，loginObj.getInstitution（））;                    list.add（项目）;
                }                的String [] =由新的String [] {电子邮件，机构};                INT []为= INT新[] {android.R.id.text1，android.R.id.text2};                INT nativeLayout = android.R.layout.two_line_list_item;                emailListView.setAdapter（新SimpleAdapter（这一点，列表，nativeLayout，从，到））;
 

I'm trying to add subItems in my ListView. My listView should be organized with emails for items and their institution for the subitems, but with the following code I just added items, how can I add my subitems on it? I've tried so many things but it doesn't work.

        List<Login> listEmails = JsonUtil.getAllEmails(json);

        ArrayList<String> emails = new ArrayList<String>();

        ArrayList<String> institutions = new ArrayList<String>();

        for (Login loginObj : listEmails) {

            emails.add(loginObj.getEmailAndress());
        }

        for (Login loginObj : listEmails) {

            institutions.add(loginObj.getInstitution());
        }

        ArrayAdapter<String> adapter;

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, emails);

        emailListView.setAdapter(adapter);

解决方案

The right way to do that is to create a HashMap for each item: Look the code below:

List<Login> listEmails = JsonUtil.getAllEmails(json);

                ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>(listEmails.size());

                for (Login loginObj : listEmails) {

                    HashMap<String, String> item = new HashMap<String, String>();
                    item.put("email", loginObj.getEmailAndress());
                    item.put("institution", loginObj.getInstitution());

                    list.add(item);
                }

                String[] from = new String[] { "email", "institution" };

                int[] to = new int[] { android.R.id.text1, android.R.id.text2 };

                int nativeLayout = android.R.layout.two_line_list_item;

                emailListView.setAdapter(new SimpleAdapter(this, list, nativeLayout , from, to));

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