一、RecyclerView设置拖动后怎么监听拖动的开始和结束
ItemTouchHelper helper = new ItemTouchHelper(new ItemTouchHelper.Callback() { @Override public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) { //首先回调的方法 返回int表示是否监听该方向 int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN | ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT;//拖拽// int swipeFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;//侧滑删除 return makeMovementFlags(dragFlags, -1); } @Override public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) { //滑动事件 Collections.swap(mList, viewHolder.getAdapterPosition(), target.getAdapterPosition()); mAdapter.notifyItemMoved(viewHolder.getAdapterPosition(), target.getAdapterPosition()); return true; } @Override public void onSelectedChanged(RecyclerView.ViewHolder viewHolder, int actionState) { if (viewHolder == null) {// onMoveEnd(); //拖动结束 ToastUtil.showShort(mContext,"拖动结束"); mAdapter.notifyDataSetChanged(); } else {// onMoveStart(); //拖动开始 } super.onSelectedChanged(viewHolder, actionState); } @Override public void onSwiped(final RecyclerView.ViewHolder viewHolder, int direction) { //侧滑事件// onItemDelete(viewHolder.itemView, viewHolder.getAdapterPosition());// mCAdapter.notifyItemRemoved(viewHolder.getAdapterPosition()); } @Override public boolean isLongPressDragEnabled() { //是否可拖拽 return true; } @Override public boolean isItemViewSwipeEnabled() { //是否可以删除 return false; } }); helper.attachToRecyclerView(mRvEdtSort); //设置给RecyleView 重写 onSelectedChanged 方法，并且判断是否拖动的开始和结束。
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