J'essaie de rechercher des endroits à proximité tels que des banques, des restaurants, des guichets automatiques dans la zone dessinée sur Google Maps dans Android
J'essaie de rechercher des endroits proches tels que des banques, des restaurants, des guichets automatiques dans la zone dessinée sur Google Maps dans Android. Je reçois des coordonnées (latitude et longitude) dans un tableau, mais je ne parviens pas à trouver des lieux proches par ce tableau. Quelqu'un peut-il m'aider? J'ai essayé de chercher mais n'ai trouvé aucun résultat . Une aide précieuse sera appréciée!
Ceci est mon indicatif régional dessiné:
public class MainActivity extends FragmentActivity implements OnTouchListener {
private static final String TAG = "polygon";
private GoogleMap mGoogleMap;
private View mMapShelterView;
private GestureDetector mGestureDetector;
private ArrayList<LatLng> mLatlngs = new ArrayList<LatLng>();
private PolylineOptions mPolylineOptions;
private PolygonOptions mPolygonOptions;
// flag to differentiate whether user is touching to draw or not
private boolean mDrawFinished = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMapShelterView = (View) findViewById(R.id.drawer_view);
mGestureDetector = new GestureDetector(this, new GestureListener());
mMapShelterView.setOnTouchListener(this);
initilizeMap();
//Contains(null);
}
private final class GestureListener extends SimpleOnGestureListener {
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
float velocityY) {
return false;
}
}
/**
* Ontouch event will draw poly line along the touch points
*
*/
@Override
public boolean onTouch(View v, MotionEvent event) {
int X1 = (int) event.getX();
int Y1 = (int) event.getY();
Point point = new Point();
point.x = X1;
point.y = Y1;
LatLng firstGeoPoint = mGoogleMap.getProjection().fromScreenLocation(
point);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
if (mDrawFinished) {
X1 = (int) event.getX();
Y1 = (int) event.getY();
point = new Point();
point.x = X1;
point.y = Y1;
LatLng geoPoint = mGoogleMap.getProjection()
.fromScreenLocation(point);
mLatlngs.add(geoPoint);
mPolylineOptions = new PolylineOptions();
mPolylineOptions.color(Color.RED);
mPolylineOptions.width(3);
mPolylineOptions.addAll(mLatlngs);
mGoogleMap.addPolyline(mPolylineOptions);
**Log.d(TAG, "Latitude and longitude: " + mLatlngs);**
}
break;
case MotionEvent.ACTION_UP:
Log.d(TAG, "Poinnts array size " + mLatlngs.size());
mLatlngs.add(firstGeoPoint);
mGoogleMap.clear();
mPolylineOptions = null;
mMapShelterView.setVisibility(View.GONE);
mGoogleMap.getUiSettings().setZoomGesturesEnabled(true);
mGoogleMap.getUiSettings().setAllGesturesEnabled(true);
mPolygonOptions = new PolygonOptions();
mPolygonOptions.fillColor(0x5500ff00);
// mPolygonOptions.fillColor(Color.LTGRAY);
mPolygonOptions.strokeColor(Color.RED);
mPolygonOptions.strokeWidth(5);
mPolygonOptions.addAll(mLatlngs);
mGoogleMap.addPolygon(mPolygonOptions);
mDrawFinished = false;
break;
}
return mGestureDetector.onTouchEvent(event);
}
/**
* Setting up map
*
*/
private void initilizeMap() {
int status = GooglePlayServicesUtil
.isGooglePlayServicesAvailable(getApplicationContext());
if (status == ConnectionResult.SUCCESS) {
if (mGoogleMap == null) {
mGoogleMap = ((SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map)).getMap();
mGoogleMap.setMyLocationEnabled(true);
}
} else if (GooglePlayServicesUtil.isUserRecoverableError(status)) {
// showErrorDialog(status);
} else {
Toast.makeText(this, "No Support for Google Play Service",
Toast.LENGTH_LONG).show();
}
}
/**
* Method gets called on tap of draw button, It prepares the screen to draw
* the polygon
*
* @param view
*/
public void drawZone(View view) {
mGoogleMap.clear();
mLatlngs.clear();
mPolylineOptions = null;
mPolygonOptions = null;
mDrawFinished = true;
mMapShelterView.setVisibility(View.VISIBLE);
mGoogleMap.getUiSettings().setScrollGesturesEnabled(false);
}
public synchronized boolean Contains(Location location) {
boolean isInside = false;
if (mLatlngs.size() > 0) {
LatLng lastPoint = mLatlngs.get(mLatlngs.size() - 1);
double x = location.getLongitude();
for (LatLng point : mLatlngs) {
double x1 = lastPoint.longitude;
double x2 = point.longitude;
double dx = x2 - x1;
if (Math.abs(dx) > 180.0) {
if (x > 0) {
while (x1 < 0)
x1 += 360;
while (x2 < 0)
x2 += 360;
} else {
while (x1 > 0)
x1 -= 360;
while (x2 > 0)
x2 -= 360;
}
dx = x2 - x1;
}
if ((x1 <= x && x2 > x) || (x1 >= x && x2 < x)) {
double grad = (point.latitude - lastPoint.latitude) / dx;
double intersectAtLat = lastPoint.latitude
+ ((x - x1) * grad);
if (intersectAtLat > location.getLatitude())
isInside = !isInside;
}
lastPoint = point;
}
}
return isInside;
}
J'ai un tableau sur mLatlang, maintenant je veux des endroits proches par des coordonnées qui ne sont pas par ma position actuelle
Voici un code fonctionnel qui utilise l’API de service Web Lieux, ce qui devrait vous aider à obtenir la fonctionnalité que vous recherchez.
La documentation générale peut être trouvé ici .
Vous pouvez trouver les types de types de lieu pris en charge ici .
Ce qui suit est un exemple simple. Commencez par générer votre chaîne de requête pour l'API:
public StringBuilder sbMethod() {
//use your current location here
double mLatitude = 37.77657;
double mLongitude = -122.417506;
StringBuilder sb = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location=" + mLatitude + "," + mLongitude);
sb.append("&radius=5000");
sb.append("&types=" + "restaurant");
sb.append("&sensor=true");
sb.append("&key=******* YOUR API KEY****************");
Log.d("Map", "api: " + sb.toString());
return sb;
}
Voici la AsyncTask utilisée pour interroger l'API Places:
private class PlacesTask extends AsyncTask<String, Integer, String> {
String data = null;
// Invoked by execute() method of this object
@Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
// Executed after the complete execution of doInBackground() method
@Override
protected void onPostExecute(String result) {
ParserTask parserTask = new ParserTask();
// Start parsing the Google places in JSON format
// Invokes the "doInBackground()" method of the class ParserTask
parserTask.execute(result);
}
}
Voici la méthode downloadURL():
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;
}
ParserTask pour analyser le résultat JSON:
private class ParserTask extends AsyncTask<String, Integer, List<HashMap<String, String>>> {
JSONObject jObject;
// Invoked by execute() method of this object
@Override
protected List<HashMap<String, String>> doInBackground(String... jsonData) {
List<HashMap<String, String>> places = null;
Place_JSON placeJson = new Place_JSON();
try {
jObject = new JSONObject(jsonData[0]);
places = placeJson.parse(jObject);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
return places;
}
// Executed after the complete execution of doInBackground() method
@Override
protected void onPostExecute(List<HashMap<String, String>> list) {
Log.d("Map", "list size: " + list.size());
// Clears all the existing markers;
mGoogleMap.clear();
for (int i = 0; i < list.size(); i++) {
// Creating a marker
MarkerOptions markerOptions = new MarkerOptions();
// Getting a place from the places list
HashMap<String, String> hmPlace = list.get(i);
// Getting latitude of the place
double lat = Double.parseDouble(hmPlace.get("lat"));
// Getting longitude of the place
double lng = Double.parseDouble(hmPlace.get("lng"));
// Getting name
String name = hmPlace.get("place_name");
Log.d("Map", "place: " + name);
// Getting vicinity
String vicinity = hmPlace.get("vicinity");
LatLng latLng = new LatLng(lat, lng);
// Setting the position for the marker
markerOptions.position(latLng);
markerOptions.title(name + " : " + vicinity);
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_Magenta));
// Placing a marker on the touched position
Marker m = mGoogleMap.addMarker(markerOptions);
}
}
}
Place_JSON classe utilisée dans ParserTask:
public class Place_JSON {
/**
* Receives a JSONObject and returns a list
*/
public List<HashMap<String, String>> parse(JSONObject jObject) {
JSONArray jPlaces = null;
try {
/** Retrieves all the elements in the 'places' array */
jPlaces = jObject.getJSONArray("results");
} catch (JSONException e) {
e.printStackTrace();
}
/** Invoking getPlaces with the array of json object
* where each json object represent a place
*/
return getPlaces(jPlaces);
}
private List<HashMap<String, String>> getPlaces(JSONArray jPlaces) {
int placesCount = jPlaces.length();
List<HashMap<String, String>> placesList = new ArrayList<HashMap<String, String>>();
HashMap<String, String> place = null;
/** Taking each place, parses and adds to list object */
for (int i = 0; i < placesCount; i++) {
try {
/** Call getPlace with place JSON object to parse the place */
place = getPlace((JSONObject) jPlaces.get(i));
placesList.add(place);
} catch (JSONException e) {
e.printStackTrace();
}
}
return placesList;
}
/**
* Parsing the Place JSON object
*/
private HashMap<String, String> getPlace(JSONObject jPlace) {
HashMap<String, String> place = new HashMap<String, String>();
String placeName = "-NA-";
String vicinity = "-NA-";
String latitude = "";
String longitude = "";
String reference = "";
try {
// Extracting Place name, if available
if (!jPlace.isNull("name")) {
placeName = jPlace.getString("name");
}
// Extracting Place Vicinity, if available
if (!jPlace.isNull("vicinity")) {
vicinity = jPlace.getString("vicinity");
}
latitude = jPlace.getJSONObject("geometry").getJSONObject("location").getString("lat");
longitude = jPlace.getJSONObject("geometry").getJSONObject("location").getString("lng");
reference = jPlace.getString("reference");
place.put("place_name", placeName);
place.put("vicinity", vicinity);
place.put("lat", latitude);
place.put("lng", longitude);
place.put("reference", reference);
} catch (JSONException e) {
e.printStackTrace();
}
return place;
}
}
Enfin, appelez le processus comme ceci:
StringBuilder sbValue = new StringBuilder(sbMethod());
PlacesTask placesTask = new PlacesTask();
placesTask.execute(sbValue.toString());
Résultat:
utilisez cette nearbysearch api:
fournir lat,lng,type et key.