在Android中对列表进行排序查看数据 [英] Sort List View data in Android

问题描述

我有一些要从服务器中提取的JSON数据.此数据中的字段之一是距离值.我需要在ListView中按从最低到最高的距离对数据进行排序.我不确定该怎么办?

I have some JSON data which I am pulling down from a server. One of the fields in this data is a distance value. I need to have the data sorted by distance from lowest to highest in the ListView. I am not sure how to go about it?

推荐答案

我不确定您到底想做什么，但是在获得json响应后，需要执行的步骤很少.

I don't know exactly what you want to do but there are few steps that are needed after you have the json response.

1. 将json数据制作为对象列表
2. 对列表进行排序
3. 使用已排序的列表设置listview的适配器

对于以后的问题，请将您的问题分为较小的但具体化的问题.

For future questions please separate your question to different smaller but concretized questions.

1.将json数据制作为对象列表

对象数据模型

class YourDataModel {
       int distance;
       .....
       public int getDistance(){
              return this.distance;
       }

       public void setDistance(int distance){
              this.distance = distance;
       }
}

然后假设getJsonResponse()返回json以及列表的所有数据.然后让该json列表添加到List:D

Then let's say getJsonResponse() returns your json with all the data for the list. And let's make that json list to List :D

String json = getJsonResponse(); // Change that line with your code
Gson gson = new Gson();
Type listType = new TypeToken<List<YourDataModel>>(){}.getType();
ArrayList<YourDataModel> data = (ArrayList<YourDataModel>) gson.fromJson(jsonOutput, listType);

2.对列表进行排序

现在让我们做一些魔术:D数据是我的数组，里面有项目.

Now let's do some magic :D data is my array with the items inside.

Collections.sort(data, new Comparator<YourDataModel>() {
    @Override
    public int compare(YourDataModel data1, YourDataModel data2) {
          if( data1.getDistance() < data2.getDistance() )
             return 1;
          else
             return 0;
    }
});

3.将具有排序列表的列表适配器设置为列表视图

我不知道在这里要描述什么:D

I don't know what to describe here :D

ListView lvData = (ListView) findViewById(R.id.listview1);
MyCustomAdapter adapter = new MyCustomAdapter(this, R.layout.listview_item_row, data);
lvData.setAdapter(adapter);

我不知道这是否是您想要的，但这是需要做的. 如果您想直接从列表视图中排序数据，请阅读以下内容:使用数组适配器对列表视图进行排序

I don't know if that's what you want but this is how it need to be done. If you want to sort the data directly from the listview read this: Sort listview with array adapter

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