我从服务器上下载了一些

JSON数据.该数据中的一个字段是距离值.我需要按ListView中从最低到最高的距离对数据进行排序.我不知道该怎么做呢？

任何帮助赞赏.

这是我的代码,以获取数据不确定如何正确排序？

// Hashmap for ListView

ArrayList> bathroomList = new ArrayList>();

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);

setContentView(R.layout.activity_search);

getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.window_title);

// Creating JSON Parser instance

JSONParser jParser = new JSONParser();

// getting JSON string from URL

JSONObject json = jParser.getJSONFromUrl(url);

try {

// Getting Array of Contacts

bathrooms = json.getJSONArray(TAG_BATHROOMS);

// looping through All Contacts

for(int i = 0; i < bathrooms.length(); i++){

JSONObject c = bathrooms.getJSONObject(i);

// Storing each json item in variable

String id = c.getString(TAG_ID);

String access = c.getString(TAG_ACCESS);

String city = c.getString(TAG_CITY);

String comment = c.getString(TAG_COMMENT);

String directions = c.getString(TAG_DIRECTIONS);

String name = c.getString(TAG_NAME);

String street = c.getString(TAG_STREET);

String bathroomtype = c.getString(TAG_BATHROOMTYPE);

String distance = c.getString(TAG_DISTANCE);

String distanceTrimmed = distance.substring(0,4) + " " + "miles away";

String avail = c.getString(TAG_AVAIL);

String country = c.getString(TAG_COUNTRY);

String state = c.getString(TAG_STATE);

String postal = c.getString(TAG_POSTAL);

//System.out.println(name);

// creating new HashMap

HashMap map = new HashMap();

// adding each child node to HashMap key => value

map.put(TAG_ID, id);

map.put(TAG_ACCESS, access);

map.put(TAG_CITY, city);

map.put(TAG_COMMENT, comment);

map.put(TAG_DIRECTIONS, directions);

map.put(TAG_NAME, name);

map.put(TAG_STREET, street);

map.put(TAG_BATHROOMTYPE, bathroomtype);

map.put(TAG_DISTANCE, distanceTrimmed);

map.put(TAG_AVAIL, avail);

map.put(TAG_COUNTRY, country);

map.put(TAG_STATE, state);

map.put(TAG_POSTAL, postal);

// adding HashList to ArrayList

bathroomList.add(map);

}

} catch (JSONException e) {

e.printStackTrace();

}

/**

* Updating parsed JSON data into ListView

* */

ListAdapter adapter = new SimpleAdapter(this, bathroomList,

R.layout.list_item,

new String[] { TAG_ID, TAG_NAME, TAG_STREET, TAG_CITY, TAG_STATE, TAG_POSTAL,TAG_COUNTRY, TAG_DISTANCE, TAG_DIRECTIONS, TAG_COMMENT, TAG_AVAIL, TAG_BATHROOMTYPE, TAG_ACCESS}, new int[] {

R.id.key,R.id.name, R.id.street, R.id.city, R.id.state, R.id.postal,R.id.country, R.id.distance, R.id.directions, R.id.comments, R.id.availability, R.id.bathroomtype, R.id.access });

setListAdapter(adapter);