public final void setData(@Nullable Data<?> data) {
        setDatas(data != null ? singleton(data) : Collections.<Data<?>>emptyList());
    }
public final void setData ( @ Nullable Data < ? > data ) { setDatas ( data != null ? singleton ( data ) : Collections . < Data < ? > > emptyList ( ) ) ; }
Connects this view to a {@link Data} instance, so it can observe its loading/error/empty state and adjust child
view visibility accordingly.
@param data The data instance to observe, which may be {@code null} to cease observing anything.