RxJava - Processing List and use result list

Question

I have a List with Bitmaps. I want to resize the bitmaps in the background thread, and call an another method with the list.

Flowable.fromIterable(imageList)
        .map(new Function<Bitmap, Bitmap>() {
            @Override
            public Bitmap apply(Bitmap bitmap) throws Exception {

                Bitmap resized = ImageUtils.getInstance().getResizedBitmap(bitmap,1200);

                return resized;
            }
        })
        .subscribeOn(Schedulers.io())
        .observeOn(Schedulers.io())
        .subscribeWith(
                //
        );

I want to get the result list (with all resized images) and handle errors. Which subscriber can do it?

Any suggestion?

akarnokd · Accepted Answer · 2018-02-07 19:25:21Z

1

The typical pattern for this is as follows:

Flowable.fromIterable(imageList)
    .map(new Function<Bitmap, Bitmap>() {
        @Override
        public Bitmap apply(Bitmap bitmap) throws Exception {

            Bitmap resized = ImageUtils.getInstance().getResizedBitmap(bitmap,1200);

            return resized;
        }
    })
    .toList()
    .subscribeOn(Schedulers.io())
    .observeOn(AndroidSchedulers.mainThread())
    .subscribeWith(
        new DisposableSubscriber<List<Bitmap>>() { 
            // ...
        }
    );

answered Feb 7, 2018 at 19:25

akarnokd

70.1k14 gold badges161 silver badges199 bronze badges

Sign up to request clarification or add additional context in comments.

5 Comments

vihkat Over a year ago

There is any option to retry the failed "apply" calls? Only the failed calls.

akarnokd Over a year ago

Why would the getResizedBitmap fail and how would a retry not fail it?

vihkat Over a year ago

For example OutOfMemoryException.

akarnokd Over a year ago

How would you recover from such fatal error? Retrying with still not enough memory will keep the method crashing.

vihkat Over a year ago

It's true in this case. Thank you

Collectives™ on Stack Overflow

RxJava - Processing List and use result list

1 Answer 1

5 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

5 Comments

Your Answer

Sign up or log in

Post as a guest

Related