You can animate images if your animation is loaded from assets and your image file is in a subdirectory of assets. Just call setImageAssetsFolder on LottieAnimationView or LottieDrawable with the relative folder inside of assets and make sure that the images that bodymovin export are in that folder with their names unchanged (should be img_#). If you use LottieDrawable directly, you should call recycleBitmaps when you are done with it.

If you need to provide your own bitmaps if you downloaded them from the network or something, you can provide a delegate to do that:

animationView.setImageAssetDelegate(new ImageAssetDelegate() {
  @Override public Bitmap fetchBitmap(LottieImageAsset asset) {
    // Your bitmap fetching code