Java 类android.support.v7.widget.RecyclerView.ItemDecoration 实例源码

private void setupRecyclerView() {
    Drawable shadow = ContextCompat.getDrawable(getContext(), R.drawable.list_drag_shadow);

    ItemDecoration background = new DragBackgroundDecoration(R.id.song_drag_root);
    ItemDecoration divider = new DragDividerDecoration(getContext(), true, R.id.instance_blank);
    ItemDecoration dragShadow = new DragDropDecoration((NinePatchDrawable) shadow);

    mRecyclerView.addItemDecoration(background);
    mRecyclerView.addItemDecoration(divider);
    mRecyclerView.addItemDecoration(dragShadow);

    mRecyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

    boolean portrait = getResources().getConfiguration().orientation != ORIENTATION_LANDSCAPE;
    boolean tablet = getResources().getConfiguration().smallestScreenWidthDp >= 600;
    if (portrait || !tablet) {
        // Add an inner shadow at the top of the list
        mRecyclerView.addItemDecoration(new InsetDecoration(
                ContextCompat.getDrawable(getContext(), R.drawable.inset_top_shadow),
                (int) getResources().getDimension(R.dimen.inset_top_shadow_height),
                Gravity.TOP));
    } else {
        // Add an inner shadow at the bottom of the list
        mRecyclerView.addItemDecoration(new InsetDecoration(
                ContextCompat.getDrawable(getContext(), R.drawable.inset_bottom_shadow),
                getResources().getDimensionPixelSize(R.dimen.inset_bottom_shadow_height),
                Gravity.BOTTOM));
    }
}

@Bindable
public ItemDecoration[] getItemDecorations() {
    NinePatchDrawable dragShadow = (NinePatchDrawable) ContextCompat.getDrawable(
            getContext(), R.drawable.list_drag_shadow);

    return new ItemDecoration[] {
            new DragBackgroundDecoration(R.id.song_drag_root),
            new DragDividerDecoration(R.id.song_drag_root, getContext(), R.id.empty_layout),
            new DragDropDecoration(dragShadow)
    };
}

@Bindable
public ItemDecoration[] getItemDecorations() {
    return new ItemDecoration[] {
            new BackgroundDecoration(R.id.loading_frame, R.id.artist_bio_card, R.id.relatedCard),
            new DividerDecoration(getContext(), R.id.artist_bio_card, R.id.album_view,
                    R.id.subheader_frame, R.id.relatedCard, R.id.empty_layout),
            new GridSpacingDecoration(
                    (int) getResources().getDimension(R.dimen.grid_margin),
                    mAlbumColumnCount, mAlbumSection.getTypeId()),
            new GridSpacingDecoration(
                    (int) getResources().getDimension(R.dimen.card_margin),
                    mRelatedColumnCount, mRelatedArtistSection.getTypeId())
    };
}

@Bindable
public ItemDecoration[] getItemDecorations() {
    return new ItemDecoration[] {
            new BackgroundDecoration(),
            new DividerDecoration(getContext(), R.id.empty_layout)
    };
}

@BindingAdapter("itemDecorations")
public static void setItemDecorations(RecyclerView recyclerView, ItemDecoration... decor) {
    for (ItemDecoration decoration : decor) {
        recyclerView.addItemDecoration(decoration);
    }
}

/**
 * Implement this with the ItemDecoration of your choice.
 *
 * if you don't want decoration, @return null
 * else @return ItemDecoration
 */
protected abstract ItemDecoration getItemDecoration();

/**
 * Implement this with the ItemDecoration of your choice.
 *
 * if you don't want decoration, @return null
 * else @return ItemDecoration
 */
@Override protected ItemDecoration getItemDecoration() {
  return new DividerDecoration(this, DividerDecoration.VERTICAL_LIST);
}

/**
 * Implement this with the ItemDecoration of your choice.
 *
 * if you don't want decoration, @return null
 * else @return ItemDecoration
 */
@Override protected ItemDecoration getItemDecoration() {
  return new DividerDecoration(this, DividerDecoration.VERTICAL_LIST);
}