老规矩,先上效果图

拖拽排序

固定首位.gif

上代码--两个类

IDragSwipe回调类
DragSwipeCallback拖拽功能类

默认是上下拖拽排序,左右滑动删除,根据自己公司业务去修改getMovementFlags()

/**
 * @Author: CC
 * @CreateDate: 2020/8/31 17:14
 * @Description: recycleView拖拽排序类
 */
public class DragSwipeCallback extends ItemTouchHelper.Callback {

    /**
     * 通过此变量通知外界发生了排序、删除等操作
     */
    private IDragSwipe mDragSwipe;
    private Boolean mLongPressDragEnabled = false;//是否长按移动
    private Boolean mItemViewSwipeEnabled = false;//是否滑动删除

    private int mFixedPosition = -1; //固定的下标（不可移动）

    /**
     * 固定某行不可以拖动
     *
     * @param fixedPosition
     */
    public void setFixedPosition(int fixedPosition) {
        mFixedPosition = fixedPosition;
    }

    public DragSwipeCallback(IDragSwipe dragSwipe) {
        mDragSwipe = dragSwipe;
    }

    public DragSwipeCallback(IDragSwipe dragSwipe, Boolean isLongPressDragEnabled, Boolean isItemViewSwipeEnabled) {
        mDragSwipe = dragSwipe;
        mLongPressDragEnabled = isLongPressDragEnabled;
        mItemViewSwipeEnabled = isItemViewSwipeEnabled;
    }

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        // 确定拖拽、滑动支持的方向
        int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
        int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
        return makeMovementFlags(dragFlags, swipeFlags);
    }

    @Override
    public boolean isLongPressDragEnabled() {
        //是否开启拖拽排序
        return mLongPressDragEnabled;
    }

    @Override
    public boolean isItemViewSwipeEnabled() {
        //是否开启滑动删除
        return mItemViewSwipeEnabled;
    }

    /**
     * 拖拽、交换事件
     */
    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        if (viewHolder.getAdapterPosition() == mFixedPosition || target.getAdapterPosition() == mFixedPosition) {
            return false;
        }
        mDragSwipe.onItemSwapped(viewHolder.getAdapterPosition(), target.getAdapterPosition());
        return true;
    }


    /**
     * 滑动成功的事件
     */
    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
        switch (direction) {
        case ItemTouchHelper.END: // START->END 标记完成事件
            mDragSwipe.onItemDone(viewHolder.getAdapterPosition());
            break;
        case ItemTouchHelper.START: // END->START 删除事件
            mDragSwipe.onItemDeleted(viewHolder.getAdapterPosition());
            break;
        default:
        }
    }

    /**
     * 拖拽、滑动时如何绘制列表
     * actionState只会为ACTION_STATE_DRAG或者ACTION_STATE_SWIPE
     */
    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        if (viewHolder.getAdapterPosition() == mFixedPosition) {
            return;
        }
        View rootView = viewHolder.itemView;
        switch (actionState) {
        case ItemTouchHelper.ACTION_STATE_DRAG:
            // 拖拽时排序，如果是isCurrentlyActive，则设置translationZ，否则复位
            // viewHolder.itemView.setTranslationZ(ResourceUtils.dp2px(isCurrentlyActive ? 4 : 0));
            super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            rootView.setBackgroundResource(isCurrentlyActive ? R.color.default_ripple_bg : R.color.lib_no_color);
            break;
        case ItemTouchHelper.ACTION_STATE_SWIPE:
            // 滑动删除时，对view的绘制
            rootView.setBackgroundResource(R.color.online_tag_text_color);
            rootView.setTranslationX(dX);
            break;
        default:
            break;
        }
    }

    /**
     * 在onSelectedChanged、onChildDraw、onChildDrawOver操作完成后可以在此进行清楚操作
     */
    @Override
    public void clearView(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        super.clearView(recyclerView, viewHolder);
        View rootView = viewHolder.itemView;
        rootView.setTranslationX(0);
    }
}

/**
 * @Author: cc
 * @CreateDate: 2020/8/31 17:13
 * @Description:item长按删除拖动移动的回调
 */
public interface IDragSwipe {
    /**
     * 两个Item交换位置
     *
     * @param fromPosition 第一个Item的位置
     * @param toPosition   第二个Item的位置
     */
    void onItemSwapped(int fromPosition, int toPosition);

    /**
     * 删除Item
     *
     * @param position 待删除Item的位置
     */
    default void onItemDeleted(int position) {
    }

    /**
     * Item标记完成
     *
     * @param position Item的位置
     */
    default void onItemDone(int position) {
    }

}

使用方法

在页面实现IDragSwipe方法

    /**
     * 拖拽排序的回调
     *
     * @param fromPosition 第一个Item的位置
     * @param toPosition   第二个Item的位置
     */
    @Override
    public void onItemSwapped(int fromPosition, int toPosition) {
        List dataList = mWrapper.getDataList();
        if (dataList == null || dataList.size() == 0) {
            return;
        }
        if (toPosition == dataList.size()) {
            return;
        }
        //排序
        Collections.swap(dataList, fromPosition, toPosition);
        mWrapper.notifyItemMoved(fromPosition, toPosition);
    }

设置回调和监听

   ItemTouchHelper.Callback callback = new DragSwipeCallback(this::onItemSwapped, true, false);
   ItemTouchHelper touchHelper = new ItemTouchHelper(callback);
   touchHelper.attachToRecyclerView(mRecyclerView);

完!