Android : Big error while downloading images

I have tried three ways of downloading images. All suggest by members of Stackoverflow . All the three methods fail to download all the images from the server. Few are downloaded and few are not.

I noticed a thing that each of the method fail to download image from particular position. That is method 3 always fails to download the first three images. I changed the images but even then , the first three images are not downloaded.

Method 1:

 public Bitmap downloadFromUrl( String imageurl )
   {
       Bitmap bm=null;
       String imageUrl = imageurl;
       try {
               URL url = new URL(imageUrl); //you can write here any link

              URLConnection ucon = url.openConnection();


             InputStream is = ucon.getInputStream();
              BufferedInputStream bis = new BufferedInputStream(is);


               ByteArrayBuffer baf = new ByteArrayBuffer(50);
              int current = 0;
              while ((current = bis.read()) != -1) {
                       baf.append((byte) current);
              }

             bm= BitmapFactory.decodeByteArray(baf.toByteArray(), 0, baf.toByteArray().length);


     } catch (IOException e) {
               Log.d("ImageManager", "Error: " + e);
     }
       return bm;

   }

Here the error i get for missed images is :SKIimagedecoder , the factory returned null.

Method: 2

 public static Bitmap loadBitmap(String url) 
   {
       Bitmap bitmap = null;
       InputStream in = null;
       BufferedOutputStream out = null;

       try {
           in = new BufferedInputStream(new URL(url).openStream(), 4*1024);

           final ByteArrayOutputStream dataStream = new ByteArrayOutputStream();
           out = new BufferedOutputStream(dataStream,  4 * 1024);

           int byte_;
           while ((byte_ = in.read()) != -1)
               out.write(byte_);
           out.flush();

           final byte[] data = dataStream.toByteArray();
           BitmapFactory.Options options = new BitmapFactory.Options();
           //options.inSampleSize = 1;

           bitmap = BitmapFactory.decodeByteArray(data, 0, data.length,options);
       } catch (IOException e) {
           System.out.println(e);
           Log.e("","Could not load Bitmap from: " + url);
       } finally {
           try{
               in.close();
               out.close();
           }catch( IOException e )
           {
               System.out.println(e);
           }
       }

       return bitmap;
   }

The error i get here is same as above.

Method 3:

private Bitmap downloadFile(String fileUrl){
    URL bitmapUrl =null;  
    Bitmap bmImg = null;
    try {
        bitmapUrl= new URL(fileUrl);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }

    HttpGet httpRequest = null;

    try {
            httpRequest = new HttpGet(bitmapUrl.toURI());
    } catch (URISyntaxException e) {
            e.printStackTrace();
    }

    try {
        HttpClient httpclient = new DefaultHttpClient();
        Http开发者_JAVA技巧Response response = (HttpResponse) httpclient
                .execute(httpRequest);

        HttpEntity entity = response.getEntity();
        BufferedHttpEntity bufHttpEntity = new BufferedHttpEntity(entity);
        InputStream instream = bufHttpEntity.getContent();
        bmImg = BitmapFactory.decodeStream(instream);
    } catch (Exception e) {
            System.out.println(e);
    }
    return bmImg;
}

The error i get here is : org.apache.http.NoHttpResponseException: The target server failed to respond.

please help. It is the only thing stopping me from completing the project.

Take a look at this.. Clearly explained about image download from the Server..Image from Server....

I'm assuming you are downloading the images to display rather than just save on the device. If this is the case, I recommend looking into using Droid-Fu, more specifically WebImageView. You can just pass the URL to the WebImageView and it will load the image as it can, which will avoid having an image fail to load because of the connection timing out, which I'm guessing is the problem you are having.

In XML:

<com.github.droidfu.widgets.WebImageView
    android:id="@+id/image"
    android:layout_width="70dip"
    android:layout_height="70dip"
    droidfu:autoLoad="true"
    droidfu:progressDrawable="..."
/>

In Code:

WebImageView  image = (WebImageView) convertView.findViewById(R.id.image);
image.setImageUrl(image_url);
image.loadImage();

It's possible that your creation of bitmaps takes time and therefore the connection times out. You could possibly get references to all the inputstreams and then download and create. This is a rough-cut answer, but if the reasoning is right, you can improve on it:

public Bitmap[] downloadFromUrl(String[] imageUrls)
{
    Bitmap[] bm = new Bitmap[imageUrls.length];
    BufferedInputStream[] bis = new BufferedInputStream[imageUrls.length];
    for (int i = 0; i < imageUrls.length; i++)
    {
        try
        {
            URL url = new URL(imageUrls[i]); // you can write here any link
            URLConnection ucon = url.openConnection();

            InputStream is = ucon.getInputStream();
            bis[i] = new BufferedInputStream(is);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    for (int i = 0; i < bis.length; i++)
    {
        try
        {
            ByteArrayBuffer baf = new ByteArrayBuffer(50);
            int current = 0;
            while ((current = bis[i].read()) != -1)
            {
                baf.append((byte) current);
            }

            bm[i] = BitmapFactory.decodeByteArray(baf.toByteArray(), 0, baf.toByteArray().length);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

    return bm;

}