Android--JSONArray排序

1、先把JSONArray放在一个ArrayList里边，利用ArrayList排序

JSONArray mJSONArray;

protected void sortJsonArrayByDate(String dateName){    List<JSONObject> list = new ArrayList<JSONObject> ();    JSONObject jsonObj = null;    for (int i = 0; i < mJSONArray.length(); i++) {        jsonObj = mJSONArray.optJSONObject(i);        list.add(jsonObj);    }    //排序操作    JsonComparator pComparator =  new JsonComparator(dateName);    Collections.sort(list, pComparator);        //把数据放回去 　　 mJSONArray = new JSONArray();    for (int i = 0; i < list.size(); i++) {        jsonObj = list.get(i);        mJSONArray.put(jsonObj);    }}

2、实现Comparator接口，自定义比较规则

public class JsonComparator implements Comparator<JSONObject>{

    String dateName = "";
    JsonComparator(String dateName){
        this.dateName = dateName;
    }
    @Override
    public int compare(JSONObject json1, JSONObject json2){
        String date1 = json1.optString(dateName);
        String date2 = json2.optString(dateName);
        if(date1.compareTo(date2) < 0){
            return 1;
        }else if(date1.compareTo(date2) >0){
            return -1;
        }
        return 0;
    }
}