我需要按 at android.os.AsyncTask.finish(AsyncTask.java:679)
at android.os.AsyncTask.access$500(AsyncTask.java:180)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:696)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:150)
at android.app.ActivityThread.main(ActivityThread.java:5639)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:799)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:689)
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？这是我的代码，以获取数据不确定如何正确排序？
*距离值未从实际数据中获得，但距离值是从代码本身获得的。
mininet> s1 ovs-ofctl add-flow "s1" in_port=1,actions:output=3日志
mininet> s1 ovs-ofctl add-flow "s1" in_port=3,actions:output=1
答案 0 :(得分：1)
你可以通过多种方式实现这一目标，一个是：
Collections.sort(list, new Comparator() {
@Override
public int compare(Object o1, Object o2) {
Location l1 = (Location) o1;
Location l2 = (Location) o2;
return Double.compare(p1.getDistance(), p2.getDistance());
}
});
Location将是班级：
public class Location {
private double mDistance;
private String mLongitude;
private String mLatitude;
private String name;
//add constructor for above parameters.
public double getDistance() { return mDistance; }
}
答案 1 :(得分：0)
以下是修补程序的代码，请按照此处
进行操作public void showList(){
List<HashMap<String, String>> slocationList = new ArrayList<HashMap<String, String>>();
try {
JSONObject jsonObj = new JSONObject(sJSON); //String sJSON
jsonArray = jsonObj.getJSONArray(TAG_RESULTS); //JSONArray jsonArray = null;
for (int i = 0; i < jsonArray.length(); i++) {
c = jsonArray.getJSONObject(i); //JSONObject c;
//String id = c.getString(TAG_ID);
name = c.getString(TAG_NAME);
address = c.getString(TAG_ADD);
String phone = c.getString(TAG_PHONE);
String dlatitude = c.getString(TAG_LAT);
String dlongitude = c.getString(TAG_LONG);
lat = Double.parseDouble(dlatitude);
longi = Double.parseDouble(dlongitude);
Location curlocation = new Location("curpoint");
curlocation.setLatitude(latitude);
curlocation.setLongitude(longitude);
Location datalocation = new Location("datapoint");
datalocation.setLatitude(lat);
datalocation.setLongitude(longi);
distance = curlocation.distanceTo(datalocation);
meter = Double.toString(distance);
HashMap<String, String> location = new HashMap<String,String>();
//location.put(TAG_ID,id);
location.put(TAG_NAME, name);
location.put(TAG_ADD, address);
location.put(TAG_PHONE, phone);
location.put(TAG_LAT, dlatitude);
location.put(TAG_LONG, dlongitude);
location.put(TAG_DIS, meter);
slocationList.add(location);
}
}
Collections.sort(slocationList, new ListComparator());//This is the sorting part method
ListAdapter adapter = new SimpleAdapter(CurrentLocationActivity.this, slocationList, R.layout.list_item,new String[]{TAG_NAME, TAG_ADD, TAG_PHONE, TAG_LAT,TAG_LONG,TAG_DIS},new int[]{R.id.name, R.id.address, R.id.phone,R.id.latitude,R.id.longitude, R.id.distance});
list.setAdapter(adapter);
//This is the sorting implementation method
public class ListComparator implements Comparator<HashMap<String, String>> {
@Override
public int compare(HashMap<String, String> lhs, HashMap<String, String> rhs) {
if (lhs.get(TAG_DIS) != null && rhs.get(TAG_DIS) != null) {
Double distance = Double.valueOf(lhs.get(TAG_DIS));
Double distance1 = Double.valueOf(rhs.get(TAG_DIS));
if (distance.compareTo(distance1) < 0) {
return -1;
} else if (distance.compareTo(distance1) > 0) {
return 1;
} else {
return 0;
}
} else {
return 0;
}
}
}
答案 2 :(得分：0)
这是您的Asynctask问题的解决方案..
public class MainActivity extends Activity {
String myJSON;
private static final String TAG_RESULTS="result";
private static final String TAG_ID = "id";
private static final String TAG_NAME = "name";
private static final String TAG_ADD ="address";
JSONArray peoples = null;
ArrayList<HashMap<String, String>> personList;
ListView list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
list = (ListView) findViewById(R.id.listView);
personList = new ArrayList<HashMap<String,String>>();
GetDataJSON g = new GetDataJSON();
g.execute("Your Api name.....");
}
protected void showList(){
try {
JSONObject jsonObj = new JSONObject(myJSON);
peoples = jsonObj.getJSONArray(TAG_RESULTS);
for(int i=0;i<peoples.length();i++){
JSONObject c = peoples.getJSONObject(i);
String id = c.getString(TAG_ID);
String name = c.getString(TAG_NAME);
String address = c.getString(TAG_ADD);
HashMap<String,String> persons = new HashMap<String,String>();
persons.put(TAG_ID,id);
persons.put(TAG_NAME,name);
persons.put(TAG_ADD,address);
personList.add(persons);
}
ListAdapter adapter = new SimpleAdapter(
MainActivity.this, personList, R.layout.list_item,
new String[]{TAG_ID,TAG_NAME,TAG_ADD},
new int[]{R.id.id, R.id.name, R.id.address}
);
list.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
class GetDataJSON extends AsyncTask<String, Void, String>{
@Override
protected String doInBackground(String... params) {
String uri = params[0];
BufferedReader bufferedReader = null;
try {
URL url = new URL(uri);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
StringBuilder sb = new StringBuilder();
bufferedReader = new BufferedReader(new InputStreamReader(con.getInputStream()));
String json;
while((json = bufferedReader.readLine())!= null){
sb.append(json+"\n");
}
return sb.toString().trim();
}catch(Exception e){
return null;
}
}
@Override
protected void onPostExecute(String result){
myJSON=result;
showList();
}
}
}