以下是使用Places Web Service API的一些工作代码,这应该可以帮助您获得所需的功能.

一般文件可以找到here.

可以找到所有类型的地方类型here.

以下是一个简单的例子.首先,生成API的查询字符串：

@H_403_6@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; }

以下是用于查询Places API的AsyncTask：

@H_403_6@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); } }

这是downloadURL()方法：

@H_403_6@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; }

用于解析JSON结果的ParserTask：

@H_403_6@private class ParserTask extends AsyncTask<String,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); } } }

ParserTask中使用的Place_JSON类：

@H_403_6@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; } }

最后,调用这个过程：

@H_403_6@StringBuilder sbValue = new StringBuilder(sbMethod()); PlacesTask placesTask = new PlacesTask(); placesTask.execute(sbValue.toString());

结果：