如何通过Android中的WEBSERVICE将文本和图像（图像URL）设置为Gridview

Question

我是Android应用程序开发的新手，在练习中我尝试使用以下代码开发应用程序

enter code here

公共类URLImageAdapter扩展了BaseAdapter {

private class Image 
{
    String url;
    Bitmap thumb;
}

private Image[] images;
private Context myContext;
private LoadThumbsTask thumbnailGen;

public URLImageAdapter(Context c, Object previousList) 
{
    myContext = c;      
    thumbnailGen = new LoadThumbsTask();    

    if(previousList != null) 
    {
        images = (Image[]) previousList;            
        thumbnailGen.execute(images);       
        return;
    }

    images = new Image[imageURLs.length];
    for(int i = 0, j = imageURLs.length; i < j; i++) 
    {
        images[i] = new Image();
        images[i].url = " " +imageURLs[i];
    }       
    thumbnailGen.execute(images);
}

public int getCount() 
{
    return images.length;
}

public Object getItem(int position)
{
    return images[position].url;
}

public long getItemId(int position)
{
    return position;
}

public Object getData() 
{

    if(thumbnailGen != null && thumbnailGen.getStatus() != AsyncTask.Status.FINISHED) {

        thumbnailGen.cancel(true);

    }
    return images;
}

public View getView(int position, View convertView, ViewGroup parent)
{

    ImageView imgView;      
    Image cached = images[position];        
    if(convertView == null)
    {       
        imgView = new ImageView(myContext);
        imgView.setLayoutParams(new GridView.LayoutParams(100,100));


    }
    else
    {           
        imgView = (ImageView) convertView;
    }       

    if(cached.thumb == null) 
    {           
        imgView.setImageResource(R.drawable.blank);     
        imgView.setScaleType(ScaleType.CENTER);


    }
    else
    {
        imgView.setScaleType(ScaleType.FIT_CENTER);
        imgView.setImageBitmap(cached.thumb);   
    }
    return imgView;
}

private void cacheUpdated() 
{
    this.notifyDataSetChanged();
}

private Bitmap loadThumb(String url) 
{       
    Bitmap thumb = null;        
    BitmapFactory.Options opts = new BitmapFactory.Options();
    opts.inSampleSize = 4;

    try 
    {       
        URL u = new URL(url);
        URLConnection c = u.openConnection();
        c.connect();            
        BufferedInputStream stream = new BufferedInputStream(c.getInputStream());           
        thumb = BitmapFactory.decodeStream(stream, null, opts);
        stream.close();
    } 
    catch (MalformedURLException e)
    {
        Log.e("Threads03", "malformed url: " + url);
    }
    catch (IOException e) 
    {
        Log.e("Threads03", "An error has occurred downloading the image: " + url);
    }
    return thumb;
}

private class LoadThumbsTask extends AsyncTask<Image, Void, Void> 
{   
    @Override
    protected Void doInBackground(Image... cache)
    {       
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inSampleSize = 4;

        for (Image i : cache)
        {               
            if(isCancelled()) return null;              
            if(i.thumb != null) continue;           
            SystemClock.sleep(400);             
            i.thumb = loadThumb(i.url);         
            publishProgress();
        }

        return null;
    }

    @Override
    protected void onProgressUpdate(Void... param)
    {
        cacheUpdated();
    }
}

private String[] imageURLs =sam();

这里sam（）是我从webservice

获得imageurl的函数