Question

I have classic AsyncTask to load image:

private class DownloadImageTask extends AsyncTask<String,Void,Bitmap> {

    Bitmap  bitmap = null;

    @Override
    protected Bitmap doInBackground(String... str) {
        try{   

            InputStream in = new java.net.URL(picture).openStream();
            bitmap = BitmapFactory.decodeStream(new SanInputStream(in));
            //viewPicture.setImageBitmap(bitmap);
            viewPicture.setBackgroundDrawable(new BitmapDrawable(bitmap));


        }
        catch(Exception e){
            e.printStackTrace();
        }
        return bitmap;
    }
}

But loading of image is to long. When I start this activity, everything is loaded besides image and only after waiting a second I can see it. What is the problem?

Answer 1

viewPicture.setBackgroundDrawable(new BitmapDrawable(bitmap));

should be done on the UI thread, in the onPostExecute method of your AsyncTask.

Also, close the stream (if !null) you use with a nice finally block of your try/catch.

And don’t worry about the time, it’s the way to go.