我正在获得改造和谷歌地图api的地方，并希望在列表中收集它们。但是这个过程异步工作，所以我的列表总是返回0.有没有办法等待改造响应？
我想使用allItems列表，但不能因为这个问题。如果有人可以提供帮助，我将不胜感激
这是我的代码
My Globals
ArrayList<MapData.ResultsBean> myList;
ArrayList<MapData.ResultsBean> allItems;
按钮onClick
menuOption1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
myList = new ArrayList<MapData.ResultsBean>();
allItems = new ArrayList<MapData.ResultsBean>();
allItems.addAll(selectAll("restaurant", myList));
allItems.addAll(selectAll("cafe", myList));
allItems.addAll(selectAll("bar", myList));
// Always return 0
Log.v("Size", "Places List size : " + allItems.size() + "");
});
选择所有功能
private ArrayList<MapData.ResultsBean> selectAll(final String type, final ArrayList<MapData.ResultsBean> list){
// Creating an object of our api interface
ApiService myApi = RetroClient.getApiService();
// Calling JSON
Call<MapData> call = myApi.getNearbyPlaces(type, mLastLocation.getLatitude() + "," + mLastLocation.getLongitude(), PROXIMITY_RADIUS);
call.enqueue(new Callback<MapData>() {
@Override
public void onResponse(Call<MapData> call, Response<MapData> response) {
Log.v("Response Code", "Response Code is : " + response.code());
if (response.isSuccessful()){
try {
for (int i = 0; i < response.body().getResults().size(); i++) {
addToList(list, response.body().getResults().get(i));
}
Log.v(type, "List Size : " + list.size() + "");
} catch (Exception e) {
Log.d("onResponse", "There is an error");
e.printStackTrace();
}
} else {
Toast.makeText(getApplicationContext(), "Something work wrong", Toast.LENGTH_LONG).show();
}
}
@Override
public void onFailure(Call<MapData> call, Throwable t) {
Toast.makeText(getApplicationContext(), "On Failure", Toast.LENGTH_LONG).show();
}
});
Log.v("Size", "Size of all list : " + list.size() + "");
return list;
}
我的界面
public interface ApiService {
@GET("/maps/api/place/nearbysearch/json?sensor=true&key=MY_KEY")
Call<MapData> getNearbyPlaces(@Query("type") String type, @Query("location") String location, @Query("radius") int radius);
}
我的MapData模型
public class MapData {
private String next_page_token;
private String status;
private List<?> html_attributions;
private List<ResultsBean> results;
public String getNext_page_token() {
return next_page_token;
}
public void setNext_page_token(String next_page_token) {
this.next_page_token = next_page_token;
}
public String getStatus() {
return status;
}
public void setStatus(String status) {
this.status = status;
}
public List<?> getHtml_attributions() {
return html_attributions;
}
public void setHtml_attributions(List<?> html_attributions) {
this.html_attributions = html_attributions;
}
public List<ResultsBean> getResults() {
return results;
}
public void setResults(List<ResultsBean> results) {
this.results = results;
}
public static class ResultsBean {
/**
* location : {"lat":28.6217885,"lng":77.217058}
* viewport : {"northeast":{"lat":28.6221309,"lng":77.21731114999999},"southwest":{"lat":28.6207613,"lng":77.21647215000002}}
*/
private GeometryBean geometry;
private String icon;
private String id;
private String name;
/**
* open_now : true
* weekday_text : []
*/
private OpeningHoursBean opening_hours;
private String place_id;
private double rating;
private String reference;
private String scope;
private String vicinity;
/**
* height : 2304
* html_attributions : ["<a href=\"https://maps.google.com/maps/contrib/109950289718771609910/photos\">Rakesh Arora<\/a>"]
* photo_reference : CoQBdwAAAN7Lk09qvlJpI3LD176UvFqgRK9noYU9zlx0zrOxlBaMzNAeay5pCPlggL-Nd0wVq2hZATJnEL8ZfFdDKRjxOjbH1w04c1EH8t_1iGbyiLj0qurpPb8F6xEyEAT61z37fJzQF5GkS6eZFEIYT0GzFM5bPuFgjSzQJuw6WYmFvk7jEhBzXaMryJPjUO1JtNtdBH2KGhTbSxdPgvE-fnauqam3l0AvFEIusw
* width : 4096
*/
private List<PhotosBean> photos;
private List<String> types;
public GeometryBean getGeometry() {
return geometry;
}
public void setGeometry(GeometryBean geometry) {
this.geometry = geometry;
}
public String getİcon() {
return icon;
}
public void setİcon(String icon) {
this.icon = icon;
}
public String getİd() {
return id;
}
public void setİd(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public OpeningHoursBean getOpening_hours() {
return opening_hours;
}
public void setOpening_hours(OpeningHoursBean opening_hours) {
this.opening_hours = opening_hours;
}
public String getPlace_id() {
return place_id;
}
public void setPlace_id(String place_id) {
this.place_id = place_id;
}
public double getRating() {
return rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public String getReference() {
return reference;
}
public void setReference(String reference) {
this.reference = reference;
}
public String getScope() {
return scope;
}
public void setScope(String scope) {
this.scope = scope;
}
public String getVicinity() {
return vicinity;
}
public void setVicinity(String vicinity) {
this.vicinity = vicinity;
}
public List<PhotosBean> getPhotos() {
return photos;
}
public void setPhotos(List<PhotosBean> photos) {
this.photos = photos;
}
public List<String> getTypes() {
return types;
}
public void setTypes(List<String> types) {
this.types = types;
}
public static class GeometryBean {
/**
* lat : 28.6217885
* lng : 77.217058
*/
private LocationBean location;
/**
* northeast : {"lat":28.6221309,"lng":77.21731114999999}
* southwest : {"lat":28.6207613,"lng":77.21647215000002}
*/
private ViewportBean viewport;
public LocationBean getLocation() {
return location;
}
public void setLocation(LocationBean location) {
this.location = location;
}
public ViewportBean getViewport() {
return viewport;
}
public void setViewport(ViewportBean viewport) {
this.viewport = viewport;
}
public static class LocationBean {
private double lat;
private double lng;
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
public void setLng(double lng) {
this.lng = lng;
}
}
public static class ViewportBean {
/**
* lat : 28.6221309
* lng : 77.21731114999999
*/
private NortheastBean northeast;
/**
* lat : 28.6207613
* lng : 77.21647215000002
*/
private SouthwestBean southwest;
public NortheastBean getNortheast() {
return northeast;
}
public void setNortheast(NortheastBean northeast) {
this.northeast = northeast;
}
public SouthwestBean getSouthwest() {
return southwest;
}
public void setSouthwest(SouthwestBean southwest) {
this.southwest = southwest;
}
public static class NortheastBean {
private double lat;
private double lng;
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
public void setLng(double lng) {
this.lng = lng;
}
}
public static class SouthwestBean {
private double lat;
private double lng;
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLng() {
return lng;
}
public void setLng(double lng) {
this.lng = lng;
}
}
}
}
public static class OpeningHoursBean {
private boolean open_now;
private List<?> weekday_text;
public boolean isOpen_now() {
return open_now;
}
public void setOpen_now(boolean open_now) {
this.open_now = open_now;
}
public List<?> getWeekday_text() {
return weekday_text;
}
public void setWeekday_text(List<?> weekday_text) {
this.weekday_text = weekday_text;
}
}
public static class PhotosBean {
private int height;
private String photo_reference;
private int width;
private List<String> html_attributions;
public int getHeight() {
return height;
}
public void setHeight(int height) {
this.height = height;
}
public String getPhoto_reference() {
return photo_reference;
}
public void setPhoto_reference(String photo_reference) {
this.photo_reference = photo_reference;
}
public int getWidth() {
return width;
}
public void setWidth(int width) {
this.width = width;
}
public List<String> getHtml_attributions() {
return html_attributions;
}
public void setHtml_attributions(List<String> html_attributions) {
this.html_attributions = html_attributions;
}
}
}
}
这是我的logchat
V/Size: Places List size : 0
V/restaurant: List Size : 20
V/bar: List Size : 21
V/cafe: List Size : 41
答案 0 :(得分：0)
当您使用Retrofit的异步方法时，您将立即返回列表，您需要等待class Test:
def __getattr__(self, name):
if callable(name):
return name()
else:
return name
回调的结果。
执行此操作的一种方法是使用回调接口异步报告结果。
onResponse您可以将其称为
public interface GetDataCallback {
void onGetMapData(MapData mapData);
void onError();
}
private void selectAll(final String type, final GetDataCallback getDataCallback){
// Creating an object of our api interface
ApiService myApi = RetroClient.getApiService();
// Calling JSON
Call<MapData> call = myApi.getNearbyPlaces(type, mLastLocation.getLatitude() + "," + mLastLocation.getLongitude(), PROXIMITY_RADIUS);
call.enqueue(new Callback<MapData>() {
@Override
public void onResponse(Call<MapData> call, Response<MapData> response) {
if (response.isSuccessful()){
getDataCallback.onGetMapData(response.body());
} else {
getDataCallback.onError();
}
}
@Override
public void onFailure(Call<MapData> call, Throwable t) {
getDataCallback.onError();
}
});
}
答案 1 :(得分：0)
在for (;;)之后将此代码写入onResponse方法。
allItems.addAll(selectAll("restaurant", myList));
allItems.addAll(selectAll("cafe", myList));
allItems.addAll(selectAll("bar", myList));