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다음 활동은 서버에서 LatLng를 가져 와서 도시 간 거리를 계산하려고 시도합니다. Logcat은 어디에서 왔는지 이해할 수없는 NullPointerException을 제공합니다. 코드가 완전하지 않음을 유의하십시오 (아직 listView가 생성되지 않았습니다 ..)하지만 이것은 주요 문제가 아닙니다. 어떤 도움을 주시면 감사하겠습니다. 문제알 수 없음 NullPointerException
package com.example.tranfer;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import com.google.android.gms.maps.model.LatLng;
import android.app.ProgressDialog;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.widget.Toast;
public class CheckItineraries extends FragmentActivity {
private ProgressDialog pDialog;
String username , origin_lat ,origin_lng ,destination_lat ,destination_lng ,
waypoint1_lat ,waypoint1_lng ,waypoint2_lat ,waypoint2_lng;
int i, j ,b;
ArrayList<LatLng> markerPoints;
// URL to get contacts JSON
private static String LOGIN_URL = "http://xxxxxxxxxxxxx/check_itineraries.php";
public static final String PREFS_NAME = "MyPreferencesFile";
// JSON Node names
JSONParser jsonParser = new JSONParser();
// contacts JSONArray
JSONArray contacts = null;
// Hashmap for ListView
ArrayList<HashMap<String, String>> itinList;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.checkitineraries);
itinList = new ArrayList<HashMap<String, String>>();
new GetData().execute();
}
private class GetData extends AsyncTask<Void, Void, Void> {
public void onPreExecute() {
super.onPreExecute();
Log.d("meg", "meg");
pDialog = new ProgressDialog(CheckItineraries.this);
pDialog.setMessage("Καταχωρώ τα στοιχεία...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
username = settings.getString("username", "nikos");
}
protected Void doInBackground(Void... args) {
// TODO Auto-generated method stub
try {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", username));
JSONObject json = jsonParser.makeHttpRequest(LOGIN_URL, "POST",
params);
// JSONObject jObj = new JSONObject();
JSONArray itin_results = json.getJSONArray("itin_results");
for (int i = 0; i < itin_results.length(); i++) {
JSONObject c = itin_results.getJSONObject(i);
String username = c.getString("username");
String startPoliPro = c.getString("startPoliPro");
String start_lat_pro = c.getString("start_lat_pro");
String start_lng_pro = c.getString("start_lng_pro");
String finalPoliPro = c.getString("finalPoliPro");
String final_lat_pro = c.getString("final_lat_pro");
String final_lng_pro = c.getString("final_lng_pro");
LinkedHashMap<String, String> pinakas = new LinkedHashMap<String, String>();
// adding each child node to HashMap key => value
pinakas.put("username", username);
pinakas.put("startPoliPro", startPoliPro);
pinakas.put("start_lat_pro", start_lat_pro);
pinakas.put("start_lng_pro", start_lng_pro);
pinakas.put("finalPoliPro", finalPoliPro);
pinakas.put("final_lat_pro", final_lat_pro);
pinakas.put("final_lng_pro", final_lng_pro);
// adding contact to contact list
itinList.add(pinakas);
b = itin_results.length();
}
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
if (pDialog.isShowing())
pDialog.dismiss();
origin_lat = itinList.get(0).get("start_lat_pro").toString();
origin_lng = itinList.get(0).get("start_lng_pro").toString();
destination_lat = itinList.get(0).get("start_lat_pro").toString();
destination_lng = itinList.get(0).get("start_lat_pro").toString();
for (i = 0; i <b; i++) {
Log.d("panikos", itinList.get(i).get("username").toString());
Log.d("panikos", itinList.get(i).get("startPoliPro").toString());
Log.d("panikos", itinList.get(i).get("start_lat_pro").toString());
Log.d("panikos", itinList.get(i).get("start_lng_pro").toString());
Log.d("panikos", itinList.get(i).get("finalPoliPro").toString());
Log.d("panikos", itinList.get(i).get("final_lat_pro").toString());
Log.d("panikos", itinList.get(i).get("final_lng_pro").toString());
waypoint1_lat = itinList.get(i).get("start_lat_pro").toString();
waypoint1_lng = itinList.get(i).get("start_lng_pro").toString();
waypoint2_lat = itinList.get(i).get("final_lat_pro").toString();
waypoint2_lng = itinList.get(i).get("final_lng_pro").toString();
LatLng origin1 = new LatLng(Double.parseDouble(origin_lat), Double.parseDouble(origin_lng));
LatLng destination = new LatLng(Double.parseDouble(destination_lat), Double.parseDouble(destination_lng));
LatLng waypoint1 = new LatLng(Double.parseDouble(waypoint1_lat), Double.parseDouble(waypoint1_lng));
LatLng waypoint2 = new LatLng(Double.parseDouble(waypoint2_lat), Double.parseDouble(waypoint2_lng));
Log.d("origin1", origin1.toString());
Log.d("destination", destination.toString());
Log.d("waypoint1", waypoint1.toString());
Log.d("waypoint2", waypoint2.toString());
**167** markerPoints.add(origin1);
markerPoints.add(destination);
markerPoints.add(waypoint1);
markerPoints.add(waypoint2);
//if (markerPoints.size() >= 4) {
LatLng or = markerPoints.get(0);
LatLng dest = markerPoints.get(1);
// LatLng way1 = markerPoints.get(2);
// LatLng way2 = markerPoints.get(3);
// Getting URL to the Google Directions API
String url = getDirectionsUrl(or, dest);
DownloadTask downloadTask = new DownloadTask();
// Start downloading json data from Google Directions API
downloadTask.execute(url);
//}
}
}
//}
//}
private String getDirectionsUrl(LatLng or, LatLng dest) {
// Origin of route
String str_origin = "origin=" + or.latitude + ","+ or.longitude;
// Destination of route
String str_dest = "destination=" + dest.latitude + "," + dest.longitude;
// Sensor enabled
String sensor = "sensor=false";
// Building the parameters to the web service
String parameters = str_origin + "&" + str_dest + "&" + sensor;
// Output format
String output = "json";
// Building the url to the web service
String url = "https://maps.googleapis.com/maps/api/directions/"
+ output + "?" + parameters;
return url;
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
HttpURLConnection urlConnection = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
urlConnection = (HttpURLConnection) url.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(
iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
urlConnection.disconnect();
}
return data;
}
///
// Fetches data from url passed
////
private class DownloadTask extends AsyncTask<String, Void, String> {
// Downloading data in non-ui thread
@Override
protected String doInBackground(String... url) {
// For storing data from web service
String data = "";
try {
// Fetching the data from web service
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
// Executes in UI thread, after the execution of
// doInBackground()
@Override
protected void onPostExecute(String result) {
super.onPostExecute(result);
ParserTask parserTask = new ParserTask();
// Invokes the thread for parsing the JSON data
parserTask.execute(result);
}
}
//e
public class ParserTask extends
AsyncTask<String, Integer, List<List<HashMap<String, String>>>> {
// Parsing the data in non-ui thread
@Override
protected List<List<HashMap<String, String>>> doInBackground(
String... jsonData) {
JSONObject jObject;
List<List<HashMap<String, String>>> routes = null;
try {
jObject = new JSONObject(jsonData[0]);
DirectionsJSONParser parser = new DirectionsJSONParser();
// Starts parsing data
routes = parser.parse(jObject);
} catch (Exception e) {
e.printStackTrace();
}
return routes;
}
// Executes in UI thread, after the parsing process
@Override
//o
protected void onPostExecute(List<List<HashMap<String, String>>> result) {
ArrayList<LatLng> points = null;
String distance = "";
//String duration = "";
if (result.size() < 1) {
Toast.makeText(getBaseContext(), "No Points",
Toast.LENGTH_SHORT).show();
return;
}
// Traversing through all the routes
for (int i = 0; i < result.size(); i++) {
points = new ArrayList<LatLng>();
// Fetching i-th route
List<HashMap<String, String>> path = result.get(i);
// Fetching all the points in i-th route
for (int j = 0; j < path.size(); j++) {
HashMap<String, String> point = path.get(j);
if (j == 0) { // Get distance from the list
distance = (String) point.get("distance");
continue;
} else if (j == 1) { // Get duration from the list
//duration = (String) point.get("duration");
continue;
}
double lat = Double.parseDouble(point.get("lat"));
double lng = Double.parseDouble(point.get("lng"));
LatLng position = new LatLng(lat, lng);
points.add(position);
}
}
Log.d("finito", distance);
// res.setText("Distance:" + distance + ", Duration:" + duration);
}
//o
}
//e
}
}
09-05 16:53:17.129: D/origin1(23107): lat/lng: (37.98152344296127,23.73720746487379)
09-05 16:53:17.129: D/destination(23107): lat/lng: (37.98152344296127,37.98152344296127)
09-05 16:53:17.129: D/waypoint1(23107): lat/lng: (37.98152344296127,23.73720746487379)
09-05 16:53:17.129: D/waypoint2(23107): lat/lng: (40.63984024315307,22.926733419299126)
09-05 16:53:17.129: D/AndroidRuntime(23107): Shutting down VM
09-05 16:53:17.129: W/dalvikvm(23107): threadid=1: thread exiting with uncaught exception (group=0x410202a0)
09-05 16:53:17.159: E/AndroidRuntime(23107): FATAL EXCEPTION: main
09-05 16:53:17.159: E/AndroidRuntime(23107): java.lang.NullPointerException
09-05 16:53:17.159: E/AndroidRuntime(23107): at com.example.tranfer.CheckItineraries$GetData.onPostExecute(CheckItineraries.java:167)
09-05 16:53:17.159: E/AndroidRuntime(23107): at com.example.tranfer.CheckItineraries$GetData.onPostExecute(CheckItineraries.java:1)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.os.AsyncTask.finish(AsyncTask.java:631)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.os.AsyncTask.access$600(AsyncTask.java:177)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.os.Handler.dispatchMessage(Handler.java:99)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.os.Looper.loop(Looper.java:137)
09-05 16:53:17.159: E/AndroidRuntime(23107): at android.app.ActivityThread.main(ActivityThread.java:4944)
09-05 16:53:17.159: E/AndroidRuntime(23107): at java.lang.reflect.Method.invokeNative(Native Method)
09-05 16:53:17.159: E/AndroidRuntime(23107): at java.lang.reflect.Method.invoke(Method.java:511)
09-05 16:53:17.159: E/AndroidRuntime(23107): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
09-05 16:53:17.159: E/AndroidRuntime(23107): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
09-05 16:53:17.159: E/AndroidRuntime(23107): at dalvik.system.NativeStart.main(Native Method)
너무 너무 바보 .... 감사합니다 – user3649152