ProgressBarRxJavaAnimation.java

private ObjectAnimator animateRegularProgress(int finalProgress) {
    ObjectAnimator animation = ObjectAnimator.ofInt(regularProgressBar, PROPERTY_NAME, 0, finalProgress);
    animation.setDuration(ANIM_PROGRESS);
    animation.setInterpolator(new LinearInterpolator());

    return animation;
}

private void animateTextProgress(float end, float total, ObjectAnimator barAnimationToCoupleTo) {

    Func0<Observable<CharSequence[]>> f = (() -> Observable.just(getValuesToAnimateOver(end, total)));

    Observable.defer(f)
            .subscribeOn(Schedulers.io())
            .observeOn(AndroidSchedulers.mainThread())
            .doOnCompleted(() -> barAnimationToCoupleTo.start())
            .doOnCompleted(() -> crossFadeWhatsCovered(false))
            .subscribe(charSequences -> setupAnimationsForCharSequence(charSequences));

}

private void setupAnimationsForCharSequence(CharSequence [] values) {
    ValueAnimator animation = new ValueAnimator();
    animation.setObjectValues(values);
    animation.addUpdateListener(valueAnimator -> textProgressOnBar.setText((CharSequence) valueAnimator.getAnimatedValue()));
    animation.setEvaluator((fraction, startValue, endValue) -> endValue);
    animation.setDuration(ANIM_PROGRESS);
    animation.setInterpolator(new LinearInterpolator());
    animation.start();
}

private CharSequence[] getValuesToAnimateOver(float end, float total) {
    CharSequence values[] = new CharSequence[(int)end];

    int count = 0;

    for (int i = 0; i < (int)end; i++) {
        values[count++] = String.format(getString(R.string.text_progress_string), moneyFormat.format(i), moneyFormat.format(total));
    }

    values[(int)end - 1] = String.format(getString(R.string.text_progress_string), moneyFormat.format(end), moneyFormat.format(total));

    return values;
}

Demo: https://www.dropbox.com/s/ljd3w0ycb5adyyk/progress_bar_animation.mp4