PhotoPicker

  private static final int REQ_CHOOSE_IMAGES = 1;

  PhotoPicker.from(MainActivity.this)
            .builder()
            .maxSelectable(9)
            .forResult(REQ_CHOOSE_IMAGES);

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      super.onActivityResult(requestCode, resultCode, data);
      if (resultCode == Activity.RESULT_OK) {
          if (requestCode == REQ_CHOOSE_IMAGES) {
              ArrayList<Image> imageList = (ArrayList<Image>) PhotoPicker.obtainResult(data);  
          }
      }
  }