Using AsyncTask to load images into a custom adapter

Question

Although there are many tutorials out there, I\'ve found it really difficult to implement an AsyncTask to load images from URI\'s (obtained from a content provider) into a c

Answer 1

You need to pass your AsyncTask the view so that it can update it when it completes:

//Run ImageLoader AsyncTask here, and let it set the ImageView when it is done.
new ImageLoader().execute(view, uri);

And modify AsyncTask so that it can handle mixed parameter types:

public class ImageLoader extends AsyncTask<Object, String, Bitmap> {

    private View view;
    private Bitmap bitmap = null;

    @Override
    protected Bitmap doInBackground(Object... parameters) {

        // Get the passed arguments here
        view = (View) parameters[0];
        String uri = (String)parameters[1];

        // Create bitmap from passed in Uri here
        // ...
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        if (bitmap != null && view != null) {
            ImageView albumArt = (ImageView) view.getTag(R.id.albumArt);
            albumArt.setImageBitmap(bitmap);
        }
    }
}

I haven't tested this code but it should give you an idea.

Answer 2

Why are you doing setImage in AsyncTask? You can do it in a thread. I don't think in this condition AsyncTask would be good. Better you do it in different thread.