RecyclerAnimationAdapter.java

 private void FromLeftToRight(View itemView, int i) {
        if(!on_attach){
            i = -1;
        }
        boolean not_first_item = i == -1;
        i = i + 1;
        itemView.setTranslationX(-400f);
        itemView.setAlpha(0.f);
        AnimatorSet animatorSet = new AnimatorSet();
        ObjectAnimator animatorTranslateY = ObjectAnimator.ofFloat(itemView, "translationX", -400f, 0);
        ObjectAnimator animatorAlpha = ObjectAnimator.ofFloat(itemView, "alpha", 1.f);
        ObjectAnimator.ofFloat(itemView, "alpha", 0.f).start();
        animatorTranslateY.setStartDelay(not_first_item ? DURATION : (i * DURATION));
        animatorTranslateY.setDuration((not_first_item ? 2 : 1) * DURATION);
        animatorSet.playTogether(animatorTranslateY, animatorAlpha);
        animatorSet.start();
    }