我想搜索附近的場地並在Google地圖上的每個附近場地上添加標記。 爲此,我使用Foursquare API和Retrofit向服務器發出請求,但問題是我收到空身體作爲響應。android - 來自Foursquare的JSON請求之後的空身體
這些是我需要傳遞的參數:https://developer.foursquare.com/start/search
https://api.foursquare.com/v2/venues/search
?client_id=CLIENT_ID
&client_secret=CLIENT_SECRET
&v=20130815
&ll=40.7,-74
&query=sushi
基本URL:https://developer.foursquare.com/docs/venues/search
.baseUrl("https://api.foursquare.com/v2/venues/search/")
我使用從請求JSON接口:
public interface FoursquareService {
@GET("venues/search")
Call<List<FoursquarePlaces>> getAllVenues(@Query("client_id") String clientId,
@Query("client_secret") String clientSecret,
@Query("v") String date,
@Query("ll") LatLng longitudeLatitude);
}
我用來從JSON主體獲取參數的類:
public class FoursquarePlaces {
private String name;
private String city;
private String category;
private String longitude;
private String latitude;
private String address;
public FoursquarePlaces() {
this.name = "";
this.city = "";
this.setCategory("");
}
public void setCity(String city){
if (city != null){
this.city = city.replaceAll("\\(", "").replaceAll("\\)", "");
}
}
public String getLongitude() {
return longitude;
}
public void setLongitude(String longitude) {
this.longitude = longitude;
}
public String getLatitude() {
return latitude;
}
public void setLatitude(String latitude) {
this.latitude = latitude;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getCategory() {
return category;
}
public void setCategory(String category) {
this.category = category;
}
}
改裝客戶端:
retrofit = new Retrofit.Builder()
.baseUrl("https://api.foursquare.com/v2/venues/search/")
.addConverterFactory(GsonConverterFactory.create())
.build();
我上,我從JSON的身體得到的位置添加一個標記:
foursquareService = retrofit.create(FoursquareService.class);
venuesLatLng = new LatLng(venuesLatitude, venuesLongitude);
foursquareService.getAllVenues(Constants.FOURSQUARE_CLIENT_KEY,
Constants.FOURSQUARE_CLIENT_SECRET, formatedDate, latLng).enqueue(new Callback<List<FoursquarePlaces>>() {
@Override
public void onResponse(Call<List<FoursquarePlaces>> call, Response<List<FoursquarePlaces>> response) {
for (FoursquarePlaces place : response.body()) {
// I get the error here on response.body()
venuesLatitude = Integer.parseInt(place.getLatitude());
venuesLongitude = Integer.parseInt(place.getLongitude());
venuesMarker.position(venuesLatLng);
mMap.addMarker(venuesMarker);
}
}
@Override
public void onFailure(Call<List<FoursquarePlaces>> call, Throwable t) {
}
});
,我得到的錯誤:
java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference
如果我評估expres錫永response.body()我得到:
errorDetail":"ll must be of the form XX.XX,YY.YY (received lat\/lng: (46.7700381,23.551585))
但我不明白,因爲我已經給了它一個經緯度類型,爲什麼會沒有那麼好,爲什麼我得到一個空的身體從響應服務器?