getParseFile（string key）从带有扩展ParseObject类的Parse.com返回null

Question

I have an extended ParseObject class with 6 fields. All of the fields return the correct data except for the ParseFile getter method. Getting ParseFiles the old fashioned way works but for some reason when I use an extended class, the data is null when GetDataCallback is called. It has an URL and image name but the data field is null.

My extended class:

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");
    }
}

Where the getter methods are called:

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());
                }
            }
        });
    }

In the adapter:

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) {

EDIT: I believe my fundamental misunderstanding was how to set the values of the extended ParseObject. As the answer below shows, the put Parse methods here actually put the values in the object. I was under the impression that put was only ever for actual database operations and my setter method was therefore not setting up the ParseObject correctly.

Answer 1

Uggh... We were so close. I found the problem, you werent setting the values to the fields in your ParseObject, which is why everything was null in the adapter. Add the following to your Listing class and change the setDetail method as follows:

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);
}

Old Answer

I maybe wrong but I'm pretty sure that you're supposed to save the URL of the ParseFile and not the ParseFile itself and use the URL to fetch the file. So in the done (..) method you should do something like:

file.getUrl();

And set it as a String. Moving on, if