How to save Bitmap to file asynchronously?

Question

Android

I want to save a Bitmap to a file. I do it through FileOutputStream. On StackOverflow they write that such operations need to be done asynchronously. I want to know if this can be achieved with the help of RxJava? If so, can you show me how?

Answer 1

Yes, it's better to do it in the background. More or less like this:

Disposable d = Observable.fromCallable(() -> {
    // save bitmap
})
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe();

And don't forget to call d.dispose() in the onDestroy() method of your activity or fragment.
P.s. I haven't checked the code, I'm writing from memory on my phone.