getParseFile（字符串键）从Parse.com返回null与扩展ParseObject类

Question

我有一个扩展的ParseObject类与6个字段。除了ParseFile getter方法外，所有字段都会返回正确的数据。获得ParseFiles这种老式的方式有效，但由于某种原因，当我使用扩展类时，调用GetDataCallback时数据为空。它具有URL和图像名称，但数据字段为空。

我的扩展类：

package [mypackage]; 

import com.parse.ParseClassName; 
import com.parse.ParseFile; 
import com.parse.ParseObject; 
import java.io.Serializable; 

@ParseClassName("Listing") 
public class Listing extends ParseObject implements Serializable { 
    private boolean active; 
    private String description, title, username; 
    private int price; 
    private ParseFile file; 

    public Listing() { 
     super(); 
    } 

    public void setDetail(boolean active, String description, String title, 
          String username, int price, ParseFile file) { 
     this.active = active; 
     this.description = description; 
     this.price = price; 
     this.title = title; 
     this.username = username; 
     this.file = file; 
    } 

    /* getter methods */ 
    public boolean getIsActive() { 
     return getBoolean("active"); 
    } 

    public String getDescription() { 
     return getString("description"); 
    } 

    public int getPrice() { 
     return getInt("price"); 
    } 

    public String getListingTitle() { /* getTitle() reserved by android */ 
     return getString("title"); 
    } 

    public String getUsername() { 
     return getString("username"); 
    } 

    public ParseFile getFile() { 
     return getParseFile("image"); 
    } 
} 

凡getter方法被称为：

public void getListings() { 
     ParseQuery<Listing> query = ParseQuery.getQuery(Listing.class); 
     /* only retrieve active listings */ 
     query.whereEqualTo("active", true); 
     query.findInBackground(new FindCallback<Listing>() { 

      @Override 
      //public void done(List<ParseObject> listingList, ParseException e) { 
      public void done(List<Listing> listingList, ParseException e) { 

       if (e == null) { 
        Log.d("listing", "Retrieved " + listingList.size() + " listings"); 
        /* clear adapter before populating */ 
        adapter.clear(); 
        /* iterate through listings and create listing objects */ 
        for (Listing listingObject : listingList) { 
         boolean active; 
         String description, title, username; 
         int price; 

         active = listingObject.getIsActive(); 
         username = listingObject.getUsername(); 
         description = listingObject.getDescription(); 
         title = listingObject.getListingTitle(); 
         price = listingObject.getPrice(); 
         file = listingObject.getFile(); 

         /* create a listing object to be added to a ListView */  
         Listing listing = new Listing(); 
         listing.setDetail(active, description, title, username, price, file); 
         listings.add(listing); 

        } /* end for loop */ 
       } 
       else { 
        Log.d("listing", "Error: " + e.getMessage()); 
       } 
      } 
     }); 
    } 

在适配器：

public View getView(int position, View convertView, ViewGroup parent){ 
     if(convertView == null){ 
      LayoutInflater mLayoutInflater = LayoutInflater.from(context); 
      convertView = mLayoutInflater.inflate(R.layout.listing_row_item, null); 
     } 

     Listing listing = listings.get(position); 
     TextView titleView = (TextView) convertView.findViewById(R.id.listing_title); 
     TextView priceView = (TextView) convertView.findViewById(R.id.listing_price); 
     final ParseImageView imageView = (ParseImageView) convertView.findViewById(R.id.ivPicture); 

     titleView.setText(listing.getListingTitle()); 
     priceView.setText("$" + String.valueOf(listing.getPrice())); 

     listing.getFile().getDataInBackground(new GetDataCallback() { //getFile() returns null 

      public void done(byte[] data, ParseException e) { 

编辑： 我相信我的根本误解是如何设定值的扩展ParseObject。如下面的答案所示，这里的put Parse方法实际上将值放入对象中。我的印象是，put只是实际的数据库操作，因此我的setter方法不能正确设置ParseObject。

Answer 1

Uggh ...我们非常亲密。我发现这个问题，你没有将值设置为ParseObject中的字段，这就是为什么适配器中的所有内容都是空的。以下添加到您的清单类和更改setDetail方法如下：

public void setDetail(boolean active, String description, String title, 
         String username, int price, ParseFile file) { 

    setIsActive(active); 
    setIsActive(description); 
    setPrice(price); 
    setListingTitle(title); 
    setUsername(username); 
    setFile(file); 
} 

public void setIsActive(boolean a) { 
    put("active", a); 
} 

public void setDescription(String s) { 
    put("description", s); 
} 

public void setPrice(int p) { 
    put("price", p); 
} 

public void setListingTitle(String t) { 
    put("title", t); 
} 

public void setUsername(String u) { 
    put("username", u); 
} 

public void setFile(ParseFile f) { 
    put("image", f); 
} 

老回答

我也许错了，但我敢肯定，你应该保存的网址ParseFile而不是ParseFile本身，并使用URL来获取文件。所以在做（..）方法，你应该这样做：

file.getUrl(); 

并将其设置为一个字符串。继续，如果