private ArrayList<BaseMedia> getSelectedMedias(Intent intent) {
        return intent.getParcelableArrayListExtra(Boxing.EXTRA_SELECTED_MEDIA);
    }
A abstract class to connect {@link com.bilibili.boxing.presenter.PickerContract.View} and {@link com.bilibili.boxing.presenter.PickerContract.Presenter}.
one job has to be done. override {@link #onCreateBoxingView(ArrayList)} to create a subclass for {@link AbsBoxingViewFragment}.

@author ChenSL
boxing/src/main/java/com/bilibili/boxing/AbsBoxingActivity.java