我正在
Android中搜索附近的地方,例如银行,餐馆,ATM机在google地图上绘制的区域.我在数组中获得坐标(纬度和经度),但是我无法通过该数组找到附近的地点.
有人可以帮我吗我试图搜索,但没有发现结果.
伟大的帮助将不胜感激！
有人可以帮我吗我试图搜索,但没有发现结果.
伟大的帮助将不胜感激！
这是我绘制的区号：
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;
}
我在mLatlang上有数组,现在我想靠近那个坐标不在当前位置的地方
解决方法
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.
可以找到所有类型的地方类型here.
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：
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：
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：
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：
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：
StringBuilder sbValue = new StringBuilder(sbMethod());
PlacesTask placesTask = new PlacesTask();
placesTask.execute(sbValue.toString());
结果：
