Android Retrofit - onclickメソッドの前に応答を待つ

Question

私はretrofitとgoogle maps apiで場所を取得していて、それらをリストで収集したいと考えています。しかし、このプロセスは非同期的に動作し、私のリストは常に0を返します。レトロフィットレスポンスを待つ方法はありますか？

allItemsリストを使用しますが、この問題はできません。誰が助けることができるならば、私はここに私のコード

マイグローバル

ArrayList<MapData.ResultsBean> myList; 
ArrayList<MapData.ResultsBean> allItems; 

ボタンの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() + ""); 
     }); 

のSelectAll機能

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; 

} 

私のIntがある

に感謝されますerface

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); 

} 

マイ地図データモデル

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; 
      } 
     } 
    } 
} 

ここでは、あなたがレトロフィットの非同期的なアプローチを使用している間、あなたは待つ必要がありますすぐにリストを返している私のlogchat

V/Size: Places List size : 0 
V/restaurant: List Size : 20 
V/bar: List Size : 21 
V/cafe: List Size : 41 

Answer 1

ですonResponseコールバックの結果を参照してください。

これを行う1つの方法は、コールバックインターフェイスを使用して結果を非同期に報告することです。

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(); 
     } 
    }); 
} 

と

selectAll("restaurant", new GetDataCallback(){ 
    @Override 
    public void onGetMapData(MapData mapData) { 
     // Parse your data 
    } 

    @Override 
    public void onError() { 
    } 
}); 

Answer 2

がfor (;;)後にonResponse方法でこのコードを書くよう、あなたはそれを呼び出すことができます。

allItems.addAll(selectAll("restaurant", myList)); 
       allItems.addAll(selectAll("cafe", myList)); 
       allItems.addAll(selectAll("bar", myList));