折线不显示在2个位置之间，但显示时间和距离
注意：抱歉我的英语不好，因为英语不是我的母语，我使用谷歌翻译。
我正在开发一个Android地图应用，用户可以在其中找到朋友的当前位置。 为了存储当前位置，我正在使用Firebase实时数据库。 在Lalit Singh之前的帮助下，它现在显示时间和距离，但仍未在两个不同的地方更新Polylines。 我的更新代码如下。
mapsActivity.java（我从火基地获取朋友位置，并更新时间，距离和折线方法）
public void proceed(final View view) { DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Email"); ref.addValueEventListener(new ValueEventListener() { @Override public void onDataChange(DataSnapshot dataSnapshot) { for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) { UserInformation details = dataSnapshot1.getValue(UserInformation.class); if (mMap != null) { mMap.clear(); } MarkerOptions markerOptions = new MarkerOptions(); LatLng latLng1 = new LatLng(details.getLatitude(), details.getLongitude()); markerOptions.position(latLng1); markerOptions.title(String.valueOf(latLng1)); mMap.addMarker(markerOptions).setIcon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)); mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID); mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng1)); mMap.animateCamera(CameraUpdateFactory.zoomTo(14)); distance_task.getDirectionsUrl(latLng1, markerOptions.getPosition()); distance_task.setLoadListener(new CalculateDistanceTime.taskCompleteListener() { @Override public void taskCompleted(String[] time_distance) { text1.setText(time_distance[0]); //Distance text2.setText(time_distance[1]); //Time } }); String url = getDirectionsUrl(latLng1, markerOptions.getPosition()); DownloadTask downloadTask = new DownloadTask(); downloadTask.execute(url); } } @Override public void onCancelled(DatabaseError databaseError) { } }); }
CalculateDistanceTime.java（添加了新类）
class CalculateDistanceTime { private taskCompleteListener mTaskListener; private Context mContext; CalculateDistanceTime(Context context) { mContext = context; } void setLoadListener(taskCompleteListener taskListener) { mTaskListener = taskListener; } void getDirectionsUrl(LatLng origin, LatLng dest) { // Origin of route String str_origin = "origin=" + origin.latitude + "," + origin.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; DownloadTask downloadTask = new DownloadTask(); // Start downloading json data from Google Directions API downloadTask.execute(url); } private String downloadUrl(String strUrl) throws IOException { String data = ""; HttpURLConnection urlConnection; 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 try (InputStream iStream = urlConnection.getInputStream()) { BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) { sb.append(line); } data = sb.toString(); br.close(); } catch (Exception e) { Log.d("Excp. while downloading", e.toString()); } finally { urlConnection.disconnect(); } return data; } interface taskCompleteListener { void taskCompleted(String[] time_distance); } private class DownloadTask extends AsyncTask { // 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); } } private class ParserTask extends AsyncTask<String, Integer, List<HashMap>> { // Parsing the data in non-ui thread @Override protected List<HashMap> doInBackground(String... jsonData) { JSONObject jObject; List<HashMap> routes = null; try { jObject = new JSONObject(jsonData[0]); DistanceTimeParser parser = new DistanceTimeParser(); // Starts parsing data routes = parser.parse(jObject); } catch (Exception e) { e.printStackTrace(); } return routes; } // Executes in UI thread, after the parsing process @Override protected void onPostExecute(List<HashMap> result) { String duration_distance = ""; if (result.size() < 1) { Log.e("Error : ", "No Points found"); return; } String[] date_dist = new String[2]; // Traversing through all the routes for (int i = 0; i < result.size(); i++) { // Fetching i-th route HashMap tmpData = result.get(i); Set key = tmpData.keySet(); Iterator it = key.iterator(); while (it.hasNext()) { String hmKey = (String) it.next(); duration_distance = tmpData.get(hmKey); System.out.println("Key: " + hmKey + " & Data: " + duration_distance); it.remove(); // avoids a ConcurrentModificationException } date_dist[i] = duration_distance; } mTaskListener.taskCompleted(date_dist); } } }
DistanceTimeParser.java（添加了新类）
public class DistanceTimeParser { public List<HashMap> parse(JSONObject jObject) { List<HashMap> routes = new ArrayList<HashMap>(); JSONArray jRoutes = null; JSONArray jLegs = null; JSONObject jDistance = null; JSONObject jDuration = null; try { jRoutes = jObject.getJSONArray("routes"); jLegs = ((JSONObject) jRoutes.get(0)).getJSONArray("legs"); List<HashMap> path = new ArrayList<HashMap>(); /** Getting distance from the json data */ jDistance = ((JSONObject) jLegs.get(0)).getJSONObject("distance"); HashMap hmDistance = new HashMap(); hmDistance.put("distance", jDistance.getString("text")); /** Getting duration from the json data */ jDuration = ((JSONObject) jLegs.get(0)).getJSONObject("duration"); HashMap hmDuration = new HashMap(); hmDuration.put("duration", jDuration.getString("text")); routes.add(hmDistance); routes.add(hmDuration); } catch (JSONException e) { e.printStackTrace(); } catch (Exception e) { } return routes; } }
DirectionsJSONParser.java（添加了新类）
public class DirectionsJSONParser { List<List<HashMap>> parse(JSONObject jObject){ List<List<HashMap>> routes = new ArrayList() ; JSONArray jRoutes ; JSONArray jLegs ; JSONArray jSteps ; try { jRoutes = jObject.getJSONArray("routes"); for(int i=0;i<jRoutes.length();i++){ jLegs = ( (JSONObject)jRoutes.get(i)).getJSONArray("legs"); List path = new ArrayList(); for(int j=0;j<jLegs.length();j++){ jSteps = ( (JSONObject)jLegs.get(j)).getJSONArray("steps"); for(int k=0;k<jSteps.length();k++){ String polyline; polyline = (String)((JSONObject)((JSONObject)jSteps.get(k)).get("polyline")).get("points"); List list = decodePoly(polyline); for(int l=0;l<list.size();l++){ HashMap hm = new HashMap(); hm.put("lat", Double.toString((list.get(l)).latitude) ); hm.put("lng", Double.toString((list.get(l)).longitude) ); path.add(hm); } } routes.add(path); } } } catch (JSONException e) { e.printStackTrace(); }catch (Exception ignored){ } return routes; } private List decodePoly(String encoded) { List poly = new ArrayList(); int index = 0, len = encoded.length(); int lat = 0, lng = 0; while (index < len) { int b, shift = 0, result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) <= 0x20); int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) <= 0x20); int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lng += dlng; LatLng p = new LatLng((((double) lat / 1E5)), (((double) lng / 1E5))); poly.add(p); } return poly; } }
在mapsActivity.java中添加了这4个方法
private String getDirectionsUrl(LatLng origin, LatLng dest) { String str_origin = "origin=" + origin.latitude + "," + origin.longitude; String str_dest = "destination=" + dest.latitude + "," + dest.longitude; String sensor = "sensor=false"; String parameters = str_origin + "&" + str_dest + "&" + sensor; String output = "json"; return "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters; } @SuppressLint("NewApi") public static String downloadUrl(String strUrl) throws IOException { String data = ""; HttpURLConnection urlConnection; 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 try (InputStream iStream = urlConnection.getInputStream()) { BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) { sb.append(line); } data = sb.toString(); br.close(); } catch (Exception e) { Log.d("Exception while down", e.toString()); } finally { urlConnection.disconnect(); } return data; } private class DownloadTask extends AsyncTask { // 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); } } private class ParserTask extends AsyncTask<String, Integer, List<List<HashMap>>> { @Override protected List<List<HashMap>> doInBackground(String... jsonData) { JSONObject jObject; List<List<HashMap>> 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; } @Override protected void onPostExecute(List<List<HashMap>> result) { ArrayList points = new ArrayList(); PolylineOptions lineOptions = new PolylineOptions(); for (int i = 0; i < result.size(); i++) { List<HashMap> path = result.get(i); for (int j = 0; j < path.size(); j++) { HashMap point = path.get(j); double lat = Double.parseDouble(point.get("lat")); double lng = Double.parseDouble(point.get("lng")); LatLng position = new LatLng(lat, lng); points.add(position); } lineOptions.addAll(points); lineOptions.width(10); lineOptions.color(Color.WHITE); mMap.addPolyline(lineOptions); } } }
mapsActivity.java（我在地图中的当前位置）
@Override public void onLocationChanged(Location location) { Log.d("onLocationChanged", "entered"); mLastLocation = location; DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); dateFormat.setTimeZone(TimeZone.getTimeZone("UTC")); Date date = new Date(); mLastUpdateTime = ((dateFormat.format(date).toString())); saveToFirebase(); if (mCurrLocationMarker != null) { mCurrLocationMarker.remove(); } latitude = location.getLatitude(); longitude = location.getLongitude(); LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); MarkerOptions markerOptions = new MarkerOptions(); markerOptions.position(latLng); markerOptions.draggable(false); markerOptions.title("Current Position"); markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)); mCurrLocationMarker = mMap.addMarker(markerOptions); //move map camera mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); mMap.animateCamera(CameraUpdateFactory.zoomTo(11)); Toast.makeText(MapsActivity.this, "Your Current Location", Toast.LENGTH_LONG).show(); //stop location updates if (mGoogleApiClient != null) { LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this); Log.d("onLocationChanged", "Removing Location Updates"); } }
Fire Base方法中保存的数据
public void saveToFirebase() { DatabaseReference ref = FirebaseDatabase.getInstance().getReference().child("Email").push(); String email = FirebaseAuth.getInstance().getCurrentUser().getEmail(); UserInformation userInformation = new UserInformation(email, mLastLocation.getLatitude(), mLastLocation.getLongitude()); ref.setValue(userInformation); }
我假设你需要路线，距离和时间。 首先创建这3个类。
-
CalculateDistanceTime.java
import android.content.Context; import android.os.AsyncTask; import android.util.Log; import com.google.android.gms.maps.model.LatLng; import org.json.JSONObject; 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.HashMap; import java.util.Iterator; import java.util.List; import java.util.Set; class CalculateDistanceTime { private taskCompleteListener mTaskListener; private Context mContext; CalculateDistanceTime(Context context) { mContext = context; } void setLoadListener(taskCompleteListener taskListener) { mTaskListener = taskListener; } void getDirectionsUrl(LatLng origin, LatLng dest) { // Origin of route String str_origin = "origin=" + origin.latitude + "," + origin.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; DownloadTask downloadTask = new DownloadTask(); // Start downloading json data from Google Directions API downloadTask.execute(url); } private String downloadUrl(String strUrl) throws IOException { String data = ""; HttpURLConnection urlConnection; 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 try (InputStream iStream = urlConnection.getInputStream()) { BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) { sb.append(line); } data = sb.toString(); br.close(); } catch (Exception e) { Log.d("Excp. while downloading", e.toString()); } finally { urlConnection.disconnect(); } return data; } interface taskCompleteListener { void taskCompleted(String[] time_distance); } private class DownloadTask extends AsyncTaskkey = tmpData.keySet(); Iterator it = key.iterator(); while (it.hasNext()) { String hmKey = (String) it.next(); duration_distance = tmpData.get(hmKey); System.out.println("Key: " + hmKey + " & Data: " + duration_distance); it.remove(); // avoids a ConcurrentModificationException } date_dist[i] = duration_distance; } mTaskListener.taskCompleted(date_dist); } } } -
DistanceTimeParser.java
import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.HashMap; import java.util.List; public class DistanceTimeParser { public List -
DirectionsJSONParser.java
import com.google.android.gms.maps.model.LatLng; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import java.util.ArrayList; import java.util.HashMap; import java.util.List; class DirectionsJSONParser { ListdecodePoly(String encoded) { List poly = new ArrayList<>(); int index = 0, len = encoded.length(); int lat = 0, lng = 0; while (index < len) { int b, shift = 0, result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = encoded.charAt(index++) - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1)); lng += dlng; LatLng p = new LatLng((((double) lat / 1E5)), (((double) lng / 1E5))); poly.add(p); } return poly; } }
简单地复制这三个文件后。 对于任何MapsActivity，您可以执行以下操作。
这是您可以在任何活动中使用以下代码的点，上面的代码对于每个活动都将保持相同（路线图）。
创建一个全局变量CalculateDistanceTime distance_task; 。
在onCreate中将其初始化为distance_task = new CalculateDistanceTime(this);
在MapsActivity.java中发布这4个方法。
private String getDirectionsUrl(LatLng origin, LatLng dest) { String str_origin = "origin=" + origin.latitude + "," + origin.longitude; String str_dest = "destination=" + dest.latitude + "," + dest.longitude; String sensor = "sensor=false"; String parameters = str_origin + "&" + str_dest + "&" + sensor; String output = "json"; return "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters; } public static String downloadUrl(String strUrl) throws IOException { String data = ""; HttpURLConnection urlConnection; 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 try (InputStream iStream = urlConnection.getInputStream()) { BufferedReader br = new BufferedReader(new InputStreamReader(iStream)); StringBuilder sb = new StringBuilder(); String line; while ((line = br.readLine()) != null) { sb.append(line); } data = sb.toString(); br.close(); } catch (Exception e) { Log.d("Exception while down", e.toString()); } finally { urlConnection.disconnect(); } return data; } private class DownloadTask extends AsyncTask { // 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); } } private class ParserTask extends AsyncTask>>> { @Override protected List>> doInBackground(String... jsonData) { JSONObject jObject; List>> 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; } @Override protected void onPostExecute(List>> result) { ArrayList points = new ArrayList<>(); lineOptions = new PolylineOptions(); for (int i = 0; i < result.size(); i++) { List> path = result.get(i); for (int j = 0; j < path.size(); j++) { HashMap point = path.get(j); double lat = Double.parseDouble(point.get("lat")); double lng = Double.parseDouble(point.get("lng")); LatLng position = new LatLng(lat, lng); points.add(position); } lineOptions.addAll(points); lineOptions.width(10); lineOptions.color(Color.WHITE); googleMap.addPolyline(lineOptions); } }
此时，您拥有所有需要的代码。
现在使用以下代码传递您所在位置和朋友位置的latlng，您将拥有时间距离和路线：
distance_task.getDirectionsUrl(latLng1, latLng2); distance_task.setLoadListener(new CalculateDistanceTime.taskCompleteListener() { @Override public void taskCompleted(String[] time_distance) { text1.setText(time_distance[0]); //Distance text2.setText(time_distance[1]); //Time } }); String url = getDirectionsUrl(latLng1, latLng2); DownloadTask downloadTask = new DownloadTask(); downloadTask.execute(url);
要显示距离和时间，您必须创建两个TextView （请参阅上面的text1和Text2）。
添加以下代码并替换为您的绘图折线代码，使用此选项
String url = getUrl(origin, dest); FetchUrl FetchUrl = new FetchUrl(); // Start downloading json data from Google Directions API FetchUrl.execute(url);
使用上面的代码，你想绘制方向， origin和dest是LatLng对象，例如下面，
LatLng dest = new LatLng(Double.parseDouble(d_lat), Double.parseDouble(d_lng));
以下是获取方向的方法，
private String getUrl(LatLng origin, LatLng dest) { // Origin of route String str_origin = "origin=" + origin.latitude + "," + origin.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 return "https://maps.googleapis.com/maps/api/directions/" + output + "?" + parameters; }
在此之后使用以下类，
private class FetchUrl extends AsyncTask { @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]); Log.d("Background Task data", data); } catch (Exception e) { Log.d("Background Task", e.toString()); } return data; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); ParserTask parserTask = new ParserTask(); // Invokes the thread for parsing the JSON data parserTask.execute(result); } } /** * A class to parse the Google Places in JSON format */ private class ParserTask extends AsyncTask>>> { // Parsing the data in non-ui thread @Override protected List>> doInBackground(String... jsonData) { JSONObject jObject; List>> routes = null; try { jObject = new JSONObject(jsonData[0]); Log.d("ParserTask", jsonData[0]); JSONArray array = jObject.getJSONArray("routes"); JSONObject paths = array.getJSONObject(0); JSONArray legs = paths.getJSONArray("legs"); JSONObject steps = legs.getJSONObject(0); JSONObject distance = steps.getJSONObject("distance"); JSONObject duration = legs.getJSONObject(0).getJSONObject("duration"); parsedDistance = distance.getString("text"); if (parsedDistance.contains("km")) { String[] val = parsedDistance.split(" "); String val1 = val[0]; distance_from = convertInMiles(val1); } else { distance_from = parsedDistance; } address = legs.getJSONObject(0).getString("end_address"); time = duration.getString("text"); DataParser parser = new DataParser(); Log.d("ParserTask", parser.toString()); // Starts parsing data routes = parser.parse(jObject); Log.d("ParserTask", "Executing routes"); Log.d("ParserTask", routes.toString()); } catch (Exception e) { Log.d("ParserTask", e.toString()); e.printStackTrace(); } return routes; } // Executes in UI thread, after the parsing process @Override protected void onPostExecute(List>> result) { ArrayList points; PolylineOptions lineOptions = null; // Traversing through all the routes if (result != null && result.size() > 0) { for (int i = 0; i < result.size(); i++) { points = new ArrayList<>(); lineOptions = new PolylineOptions(); // Fetching i-th route List> path = result.get(i); // Fetching all the points in i-th route for (int j = 0; j < path.size(); j++) { HashMap point = path.get(j); double lat = Double.parseDouble(point.get("lat")); double lng = Double.parseDouble(point.get("lng")); LatLng position = new LatLng(lat, lng); points.add(position); } // Adding all the points in the route to LineOptions lineOptions.addAll(points); lineOptions.width(10); lineOptions.color(Color.BLACK); p_distance.setText("Distance : " + distance_from); p_time.setText("ETA :" + time); if (p_time.getText().toString().length() == 10) { arrival_time = p_time.getText().toString().substring(5, p_time.getText().toString().length() - 4); Log.d("arrival_time", arrival_time); SessionManager.put(Constants.TIME, arrival_time); } else if (p_time.getText().toString().length() > 10) { arrival_time = p_time.getText().toString().substring(5, p_time.getText().toString().length() - 5); Log.d("arrival_time", arrival_time); SessionManager.put(Constants.TIME, arrival_time); } p_address.setText("Address : " + address); navigation.setVisibility(View.VISIBLE); Log.d("onPostExecute", "onPostExecute lineoptions decoded"); } } // Drawing polyline in the Google Map for the i-th route if (lineOptions != null) { mMap.addPolyline(lineOptions); } else { Log.d("onPostExecute", "without Polylines drawn"); } } } 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(); Log.d("downloadUrl", data); br.close(); } catch (Exception e) { Log.d("Exception", e.toString()); } finally { assert iStream != null; iStream.close(); assert urlConnection != null; urlConnection.disconnect(); } return data; }