我正在开发一款小应用，并实施了Google地图和地方API。目前，我能够在地图上看到我的所有标记，并且群集工作正常。我可以放大打开的簇，并能够看到标记。我有一个具有不同类型的微调器，一旦选择该类型传递给位置搜索字符串。
这是我的地图代码，其中包含群集：
public class MapsActivity extends FragmentActivity implements LocationListener,ClusterManager.OnClusterItemInfoWindowClickListener<MyItem> {
GoogleMap mMap;
double myLatitude = 0;
double myLongitude = 0;
HashMap<String, String> mMarker = new HashMap<String, String>();
PlaceJSONParser placeJsonParser = new PlaceJSONParser();
private ClusterManager<MyItem> mClusterManager;
protected MyItem clickedClusterItem;
String[] placeType;
String[] placeTypeName;
Spinner spinPlaceType;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mMap = mapFragment.getMap();
onMapReady();
// Array of place types
placeType = getResources().getStringArray(R.array.placeType);
// Array of place type names
placeTypeName = getResources().getStringArray(R.array.placeTypeName);
// Creating an array adapter with an array of Place types
// to populate the spinner
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, R.layout.spinner_item, R.id.textview, placeTypeName);
// Getting reference to the Spinner
spinPlaceType = (Spinner) findViewById(R.id.spinPlaceType);
// Setting adapter on Spinner to set place types
spinPlaceType.setAdapter(adapter);
spinPlaceType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
int selectedPosition = spinPlaceType.getSelectedItemPosition();
final String type = placeType[selectedPosition];
StringBuilder sb = new StringBuilder(
"https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location=" + myLatitude + "," + myLongitude);
sb.append("&type=" + type);
sb.append("&radius=4000");
sb.append("&key=PLACES_KEY");
// Creating a new non-ui thread task to download Google place json
// data
PlacesTask placesTask = new PlacesTask();
// Invokes the "doInBackground()" method of the class PlaceTask
placesTask.execute(sb.toString());
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
StringBuilder sb = new StringBuilder(
"https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("location=" + myLatitude + "," + myLongitude);
sb.append("&type=restaurant");
sb.append("&radius=4000");
sb.append("&key=PLACES_KEY");
// Creating a new non-ui thread task to download Google place json
// data
PlacesTask placesTask = new PlacesTask();
// Invokes the "doInBackground()" method of the class PlaceTask
placesTask.execute(sb.toString());
}
});
// Will display next 20 places returned form the next_page_token
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab_more);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Finding you some more places.", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
StringBuilder sb = new StringBuilder(
"https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
sb.append("pagetoken=" + placeJsonParser.getNext_Page_token());
sb.append("&key=PLACES_KEY");
// Creating a new non-ui thread task to download Google place json
// data
if (placeJsonParser.getNext_Page_token() == null || placeJsonParser.getNext_Page_token() == ""){
Snackbar.make(view, "No more places left to find.", Snackbar.LENGTH_SHORT)
.setAction("Action", null).show();
}
PlacesTask placesTask = new PlacesTask();
// Invokes the "doInBackground()" method of the class PlaceTask
placesTask.execute(sb.toString());
}
});
mMap.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
Intent detailsIntent = new Intent(getBaseContext(), PlaceDetailsActivity.class);
String reference = mMarker.get(marker.getId());
marker.getPosition();
detailsIntent.putExtra("reference", reference);
detailsIntent.putExtra("markerLat", myLatitude);
detailsIntent.putExtra("markerLong", myLongitude);
startActivity(detailsIntent);
}
});
}
public void onMapReady(){
// Enabling MyLocation in Google Map
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setCompassEnabled(true);
mMap.getUiSettings().setZoomControlsEnabled(true);
// Getting LocationManager object from System Service
// LOCATION_SERVICE
LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
// Creating a criteria object to retrieve provider
Criteria criteria = new Criteria();
// Getting the name of the best provider
String provider = locationManager.getBestProvider(criteria, true);
// Getting Current Location From GPS
Location location = locationManager.getLastKnownLocation(provider);
// onLocationChanged(location);
if (location != null) {
onLocationChanged(location);
}
}
/**
* A method to download json data from url
*/
private String downloadUrl(String strUrl) throws IOException {
String referer ="";
StringBuilder jsonResults = new StringBuilder();
HttpURLConnection conn = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
conn = (HttpURLConnection) url.openConnection();
if (referer != null) {
conn.setRequestProperty("Referer", referer);
}
InputStreamReader in = new InputStreamReader(conn.getInputStream());
// Load the results into a StringBuilder
int read;
char[] buff = new char[1024];
while ((read = in.read(buff)) != -1) {
jsonResults.append(buff, 0, read);
}
// Displays the list of places found in the terminal.
Log.i("Data", "Places Found: " + jsonResults);
} catch (MalformedURLException e) {
Log.i("Google Places Utility", "Error processing Places API URL");
return null;
} catch (IOException e) {
Log.i("Google Places Utility", "Error connecting to Places API");
return null;
} finally {
if (conn != null) {
conn.disconnect();
}
}
return jsonResults.toString();
}
/**
* A class, to download Google 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 ParseTask
parserTask.execute(result);
}
}
/**
* A class to parse the Google Places in JSON format
*/
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;
try {
jObject = new JSONObject(jsonData[0]);
/** Getting the parsed data as a List construct */
places = placeJsonParser.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) {
// Clears all the existing markers
mMap.clear();
setUpClusterer(list);
}
}
private void setUpClusterer(List<HashMap<String, String>> list) {
// Position the map.
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(myLatitude,myLongitude), 13));
// Initialize the manager with the context and the map.
// (Activity extends context, so we can pass 'this' in the constructor.)
mClusterManager = new ClusterManager<MyItem>(this, mMap);
// Point the map's listeners at the listeners implemented by the cluster
// manager.
mMap.setOnCameraChangeListener(mClusterManager);
mMap.setOnMarkerClickListener(mClusterManager);
mMap.setInfoWindowAdapter(mClusterManager.getMarkerManager());
mMap.setOnInfoWindowClickListener(mClusterManager);
mClusterManager.setOnClusterItemInfoWindowClickListener(this);
mClusterManager
.setOnClusterItemClickListener(new ClusterManager.OnClusterItemClickListener<MyItem>() {
@Override
public boolean onClusterItemClick(MyItem item) {
clickedClusterItem = item;
return false;
}
});
// Add cluster items (markers) to the cluster manager.
addItems(list);
mClusterManager.getMarkerCollection().setOnInfoWindowAdapter(
new MyCustomAdapterForItems());
}
public class MyCustomAdapterForItems implements GoogleMap.InfoWindowAdapter {
private final View myContentsView;
MyCustomAdapterForItems() {
myContentsView = getLayoutInflater().inflate(
R.layout.info_window, null);
}
@Override
public View getInfoWindow(Marker marker) {
TextView tvTitle = ((TextView) myContentsView
.findViewById(R.id.txtTitle));
TextView tvSnippet = ((TextView) myContentsView
.findViewById(R.id.txtSnippet));
tvTitle.setText(clickedClusterItem.getTitle());
tvSnippet.setText(clickedClusterItem.getSnippet());
return myContentsView;
}
@Override
public View getInfoContents(Marker marker) {
return null;
}
}
private void addItems(List<HashMap<String, String>> list) {
double latitude;
double longitude;
for (int i = 0; i < list.size(); i++) {
HashMap<String, String> hmPlace = list.get(i);
// Getting latitude of the place
latitude = Double.parseDouble(hmPlace.get("lat"));
// Getting longitude of the place
longitude = Double.parseDouble(hmPlace.get("lng"));
String name = hmPlace.get("place_name");
// Getting vicinity
String vicinity = hmPlace.get("vicinity");
MyItem offsetItem = new MyItem(latitude, longitude, hmPlace.get("reference"), name, vicinity);
mClusterManager.addItem(offsetItem);
}
}
public void onClusterItemInfoWindowClick(MyItem item) {
Intent placesIntent = new Intent(getBaseContext(), PlaceDetailsActivity.class);
String reference = item.getReference();
placesIntent.putExtra("name", item.getTitle());
placesIntent.putExtra("reference", reference);
placesIntent.putExtra("sourcelat", myLatitude);
placesIntent.putExtra("sourcelng", myLongitude);
startActivity(placesIntent);
}
@Override
public void onLocationChanged(Location location) {
myLatitude = location.getLatitude();
myLongitude = location.getLongitude();
LatLng myLocation = new LatLng(myLatitude, myLongitude);
mMap.moveCamera(CameraUpdateFactory.newLatLng(myLocation));
mMap.animateCamera(CameraUpdateFactory.zoomTo(13));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}
我的myItem类获取标记的信息：
package com.example.tariq.outandabout;
import com.google.android.gms.maps.model.LatLng;
import com.google.maps.android.clustering.ClusterItem;
public class MyItem implements ClusterItem {
LatLng mPosition;
private String reference,placeTitle,snippet;
public MyItem(double lat, double lng,String val,String title, String snip) {
mPosition = new LatLng(lat, lng);
reference=val;
placeTitle=title;
snippet = snip;
}
@Override
public LatLng getPosition() {
// TODO Auto-generated method stub
return mPosition;
}
public String getReference() {
// TODO Auto-generated method stub
return reference;
}
public String getTitle() {
// TODO Auto-generated method stub
return placeTitle;
}
public String getSnippet() {
// TODO Auto-generated method stub
return snippet;
}
}
目前只显示红色标记，但我想知道是否有办法根据从微调器中选择的类型获得不同的标记，例如，如果我选择医院，则标记显示为小医院图标，如果我选择ATM，然后出现一个小的ATM图标。
任何帮助将不胜感激。