Как выполнить метод async из другого класса

Question

Я создал метод async в этом классе, но не смог найти способ его выполнения до того, как будет выполнен метод getAllPaintings. Вот класс рисования, когда я запускаю его. Я получаю ошибку на int size = titles.length; Так как я могу выполнить метод async.

package com.ITAN.cinematheque.items; 

import android.content.res.Resources; 
import android.content.res.TypedArray; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.AsyncTask; 

import com.ITAN.cinematheque.R; 
import com.ITAN.cinematheque.activities.MainActivity; 
import com.uwetrottmann.tmdb.Tmdb; 
import com.uwetrottmann.tmdb.entities.Movie; 
import com.uwetrottmann.tmdb.entities.ResultsPage; 
import com.uwetrottmann.tmdb.services.MoviesService; 

import java.io.IOException;  
import java.io.InputStream; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLConnection; 
import java.util.ArrayList; 
import java.util.Collection; 
import java.util.Iterator; 
import java.util.List; 
import java.util.ListIterator; 

public class Painting { 

    private final String imageUrl; 
    private final String title; 
    private final String year; 
    private final Double location; 
    static List<Movie> mplist; 
    static String [] titles; 
    static String [] rdate; 
    static String [] imageurl; 
    static Double [] pop; 
    static String Image_Base_Url = "http://image.tmdb.org/t/p/w500/"; 

    // String [] 
    private Painting(String imageUrl, String title, String year, Double location) { 

     this.imageUrl = imageUrl; 
     this.title = title; 
     this.year = year; 
     this.location = location; 
     //GetXMLTask task = new GetXMLTask(); 
     // Execute the task 
     //task.execute(new String[] {   "http://www.boatshedmarket.com.au/image/data/flowers_img.jpg","http://www.ladybugflorist.com/pictures/home_pic1.jpg","http://www.bitrebels.com/wp-content/uploads/2012/11/electrocuted-flowers-robert-buelteman-7.jpg","http://www.straightbackphysio.co.uk/images/physio-portal/flowers.jpg" }); 

    } 

    public String getImageUrl() { 
     return imageUrl; 
    } 

    public String getTitle() { 
     return title; 
    } 

    public String getYear() { 
     return year; 
    } 

    public Double getLocation() { 
     return location; 
    } 

    public static Painting[] getAllPaintings(Resources res) { 
     new showMovieInfo().execute(); 
     // String[] titles = res.getStringArray(R.array.paintings_titles); 
     // String[] years = res.getStringArray(R.array.paintings_years); 
     // String[] locations = res.getStringArray(R.array.paintings_locations); 
     // TypedArray images = res.obtainTypedArray(R.array.paintings_images); 
     // Bitmap bmp = BitmapFactory.decodeResource(res,R.drawable.sunflowers); 

     // String[] titles ={"Godzilla","X-Men: Days of Future Past","Neighbors","Divergent","The  Fault in Our Stars","The Amazing Spider-Man 2","The Expendables 3","The Prince","Blended","Guardians of the Galaxy","Frozen","Need for Speed","Noah","Maleficent","Sparks","The Lego Movie","Pretty Baby","Sabotage","Street Fighter: Assassin's Fist" 
     // }; 
     // String[] years ={"Year 1","Year 2","Year 3","Year4"}; 
     // String[] locations={"Location 1","Location 2","Location 3","Location 4"}; 
     // String[] images =  {"http://i.imgur.com/DvpvklR.png","http://i.imgur.com/DvpvklR.png","http://i.imgur.com/DvpvklR.png"," http://i.imgur.com/DvpvklR.png"}; 
     // String[] images = {bmp.toString(), bmp.toString(), bmp.toString(), bmp.toString()}; 

     int size = titles.length; 
     Painting[] paintings = new Painting[size]; 

     for (int i = 0; i < size; i++) { 
      // paintings[i] = new Painting(images.get(i), titles[i], years[i], locations[i]); 
      // paintings[i] = new Painting(images.getResourceId(i, -1), titles[i], years[i], locations[i]); 
      paintings[i] = new Painting(imageurl[i], titles[i], rdate[i], pop[i]); 
     } 

     return paintings; 
    } 
    public static void executeTask() 
    { 
     new showMovieInfo().execute(); 
    } 

    public static class showMovieInfo extends AsyncTask<Integer,Integer,List<Movie>> { 

     protected void onPreExecute(Integer f){ 
      //setting up variables for whole method 
     } 

     @Override 
     protected List<Movie> doInBackground(Integer... params) { 
      Tmdb tmdb = new Tmdb(); 
      tmdb.setApiKey(MYAPIKEY); 
      MoviesService movieService = tmdb.moviesService(); 
      ResultsPage movie = movieService.popular();//you can use a String[] array at the place of 550. 
      //String str = String.valueOf(movie.title); 

      //you can create multiple return statements or u can use if else statement for different commands. 
      return movie.results; 
      ///MenuInflater inflater = new MenuInflater(MainActivity.this); 
      //inflater.inflate(android.R.layout.simple_list_item_1, false); 


     } 
     protected void onProgressUpdated(Integer... progress) 
     { 

     } 
     protected void onPostExecute(final List<Movie> result) 
     { 

      mplist = new List<Movie>() { 
       @Override 
       public void add(int location, Movie object) { 

       } 

       @Override 
       public boolean add(Movie object) { 
        return false; 
       } 

       @Override 
       public boolean addAll(int location, Collection<? extends Movie> collection) { 
        return false; 
       } 

       @Override 
       public boolean addAll(Collection<? extends Movie> collection) { 
        return false; 
       } 

       @Override 
       public void clear() { 

       } 

       @Override 
       public boolean contains(Object object) { 
        return false; 
       } 

       @Override 
       public boolean containsAll(Collection<?> collection) { 
        return false; 
       } 

       @Override 
       public boolean equals(Object object) { 
        return false; 
       } 

       @Override 
       public Movie get(int location) { 
        return null; 
       } 

       @Override 
       public int hashCode() { 
        return 0; 
       } 

       @Override 
       public int indexOf(Object object) { 
        return 0; 
       } 

       @Override 
       public boolean isEmpty() { 
        return false; 
       } 

       @Override 
       public Iterator<Movie> iterator() { 
        return null; 
       } 

       @Override 
       public int lastIndexOf(Object object) { 
        return 0; 
       } 

       @Override 
       public ListIterator<Movie> listIterator() { 
        return null; 
       } 

       @Override 
       public ListIterator<Movie> listIterator(int location) { 
        return null; 
       } 

       @Override 
       public Movie remove(int location) { 
        return null; 
       } 

       @Override 
       public boolean remove(Object object) { 
        return false; 
       } 

       @Override 
       public boolean removeAll(Collection<?> collection) { 
        return false; 
       } 

       @Override 
       public boolean retainAll(Collection<?> collection) { 
        return false; 
       } 

       @Override 
       public Movie set(int location, Movie object) { 
        return null; 
       } 

       @Override 
       public int size() { 
        return 0; 
       } 

       @Override 
       public List<Movie> subList(int start, int end) { 
        return null; 
       } 

       @Override 
       public Object[] toArray() { 
        return new Object[0]; 
       } 

       @Override 
       public <T> T[] toArray(T[] array) { 
        return null; 
       } 
      }; 
      mplist = result; 

      String str = String.valueOf(mplist.get(0).release_date); 
      String str1 = String.valueOf(mplist.get(1).release_date); 
      String str2 = String.valueOf(mplist.get(2).release_date); 
      String str3 = String.valueOf(mplist.get(3).release_date); 
      String str4 = String.valueOf(mplist.get(4).release_date); 
      String str5 = String.valueOf(mplist.get(5).release_date); 
      String str6 = String.valueOf(mplist.get(6).release_date); 
      String str7 = String.valueOf(mplist.get(7).release_date); 
      String str8 = String.valueOf(mplist.get(8).release_date); 
      String str9 = String.valueOf(mplist.get(9).release_date); 
      String str10 = String.valueOf(mplist.get(10).release_date); 
      String str11 = String.valueOf(mplist.get(11).release_date); 
      String str12 = String.valueOf(mplist.get(12).release_date); 
      String str13 = String.valueOf(mplist.get(13).release_date); 
      String str14 = String.valueOf(mplist.get(14).release_date); 
      String str15 = String.valueOf(mplist.get(15).release_date); 
      String str16 = String.valueOf(mplist.get(16).release_date); 
      String str17 = String.valueOf(mplist.get(17).release_date); 
      String str18 = String.valueOf(mplist.get(18).release_date); 
      String str19 = String.valueOf(mplist.get(19).release_date); 




      titles = new String[]{result.get(0).title,result.get(1).title,result.get(2).title,result.get(3).title,result.get(4).title,result.get(5).title,result.get(6).title,result.get(7).title,result.get(8).title,result.get(9).title,result.get(10).title,result.get(11).title,result.get(12).title,result.get(13).title,result.get(14).title,result.get(15).title,result.get(16).title,result.get(17).title,result.get(18).title,result.get(19).title}; 
      rdate = new String[]{str,str1,str2,str3,str4,str5,str6,str7,str8,str9,str10,str11,str12,str13,str14,str15,str16,str17,str18,str19}; 
      imageurl = new String[] {Image_Base_Url+result.get(0).poster_path,Image_Base_Url+result.get(1).poster_path,Image_Base_Url+result.get(2).poster_path,Image_Base_Url+result.get(3).poster_path,Image_Base_Url+result.get(4).poster_path,Image_Base_Url+result.get(5).poster_path,Image_Base_Url+result.get(6).poster_path,Image_Base_Url+result.get(7).poster_path,Image_Base_Url+result.get(8).poster_path,Image_Base_Url+result.get(9).poster_path,Image_Base_Url+result.get(10).poster_path,Image_Base_Url+result.get(11).poster_path,Image_Base_Url+result.get(12).poster_path,Image_Base_Url+result.get(13).poster_path,Image_Base_Url+result.get(14).poster_path,Image_Base_Url+result.get(15).poster_path,Image_Base_Url+result.get(16).poster_path,Image_Base_Url+result.get(17).poster_path,Image_Base_Url+result.get(18).poster_path,Image_Base_Url+result.get(19).poster_path}; 
      pop = new Double[]{result.get(0).popularity,result.get(1).popularity,result.get(2).popularity,result.get(3).popularity,result.get(4).popularity,result.get(5).popularity,result.get(6).popularity,result.get(7).popularity,result.get(8).popularity,result.get(9).popularity,result.get(10).popularity,result.get(11).popularity,result.get(12).popularity,result.get(13).popularity,result.get(14).popularity,result.get(15).popularity,result.get(16).popularity,result.get(17).popularity,result.get(18).popularity,result.get(19).popularity}; 
      // tv.setText(str); 
      //you can use s string array here and use stringarray.add(result) to add multiple items to the array and then you can get those items by using stringarray.get(1). 
     } 
    } 
} 

Answer 1

Поскольку это асинхронный, нет никакой гарантии, что он будет возвращаться до остальной части кода (и, скорее всего, не будет). Таким образом, вам нужно запустить задачу, а затем вызвать метод от onPostExecute(), чтобы запустить все, что вы хотите запустить после его завершения.

Итак, где бы вы ни работали getAllPaintings(), вызовите метод для запуска своей задачи, а затем вызовите этот метод с onPostExecute(). Есть слишком много кода, что я не собираюсь показывать пример, но это должно дать вам эту идею.