RecyclerView滑动和移动项目在Android中无法使用BottomSheetDialog

我想使用ItemTouchHelper类在RecyclerView中滑动和拖放项目。RecyclerView位于BottomSheetDialog内

以下是设置RecyclerView的代码

musicAdapterRecyclerView = new MusicAdapterRecyclerView(this, mainList);
    playlistRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    playlistRecyclerView.setClickable(true);
    playlistRecyclerView.setHasFixedSize(false);
    playlistRecyclerView.setAdapter(musicAdapterRecyclerView);
    bottomSheetDialog.setContentView(view);
    bottomSheetDialog.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialogInterface) {
            BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialogInterface;
            FrameLayout bottomSheet = (FrameLayout) bottomSheetDialog
                    .findViewById(android.support.design.R.id.design_bottom_sheet);
            BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_COLLAPSED);
        }
    });
    playlistRecyclerView.scrollToPosition(playingIndex);
    playlistRecyclerView.setNestedScrollingEnabled(false);
    setupItemTouchHelper();

 public void setupItemTouchHelper(){
    final ItemTouchHelper.Callback callback = new ItemTouchHelper.Callback() {
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            adapterRecyclerView =(MusicAdapterRecyclerView) recyclerView.getAdapter();

            int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
            int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
            return makeMovementFlags(dragFlags, swipeFlags);
        }



        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            int fromPosition = viewHolder.getAdapterPosition();
            int toPosition = target.getAdapterPosition();
            if (fromPosition < toPosition) {
                for (int i = fromPosition; i < toPosition; i++) {
                    Collections.swap(mainList, i, i + 1);
                }
            } else {
                for (int i = fromPosition; i > toPosition; i--) {
                    Collections.swap(mainList, i, i - 1);
                }
            }
            musicAdapterRecyclerView.notifyItemMoved(fromPosition, toPosition);
            return true;

        }

        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

            final int pos = viewHolder.getAdapterPosition();
            if(pos<0 && pos>=mainList.size()){
                return;
            }

            mainList.remove(pos);
            adapterRecyclerView.removeItem(pos);
            adapterRecyclerView.notifyItemRemoved(pos);
            adapterRecyclerView.notifyItemRangeChanged(pos,mainList.size());

        }




        @Override
        public boolean isLongPressDragEnabled() {
            return true;
        }

        @Override
        public boolean isItemViewSwipeEnabled() {
            return true;
        }
    };
    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
    itemTouchHelper.attachToRecyclerView(playlistRecyclerView);

}

以下是在RecyclerView上设置ItemTouchHelper类的代码

musicAdapterRecyclerView = new MusicAdapterRecyclerView(this, mainList);
    playlistRecyclerView.setLayoutManager(new LinearLayoutManager(this));
    playlistRecyclerView.setClickable(true);
    playlistRecyclerView.setHasFixedSize(false);
    playlistRecyclerView.setAdapter(musicAdapterRecyclerView);
    bottomSheetDialog.setContentView(view);
    bottomSheetDialog.setOnShowListener(new DialogInterface.OnShowListener() {
        @Override
        public void onShow(DialogInterface dialogInterface) {
            BottomSheetDialog bottomSheetDialog = (BottomSheetDialog) dialogInterface;
            FrameLayout bottomSheet = (FrameLayout) bottomSheetDialog
                    .findViewById(android.support.design.R.id.design_bottom_sheet);
            BottomSheetBehavior.from(bottomSheet).setState(BottomSheetBehavior.STATE_COLLAPSED);
        }
    });
    playlistRecyclerView.scrollToPosition(playingIndex);
    playlistRecyclerView.setNestedScrollingEnabled(false);
    setupItemTouchHelper();

 public void setupItemTouchHelper(){
    final ItemTouchHelper.Callback callback = new ItemTouchHelper.Callback() {
        @Override
        public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
            adapterRecyclerView =(MusicAdapterRecyclerView) recyclerView.getAdapter();

            int dragFlags = ItemTouchHelper.UP | ItemTouchHelper.DOWN;
            int swipeFlags = ItemTouchHelper.START | ItemTouchHelper.END;
            return makeMovementFlags(dragFlags, swipeFlags);
        }



        @Override
        public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
            int fromPosition = viewHolder.getAdapterPosition();
            int toPosition = target.getAdapterPosition();
            if (fromPosition < toPosition) {
                for (int i = fromPosition; i < toPosition; i++) {
                    Collections.swap(mainList, i, i + 1);
                }
            } else {
                for (int i = fromPosition; i > toPosition; i--) {
                    Collections.swap(mainList, i, i - 1);
                }
            }
            musicAdapterRecyclerView.notifyItemMoved(fromPosition, toPosition);
            return true;

        }

        @Override
        public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {

            final int pos = viewHolder.getAdapterPosition();
            if(pos<0 && pos>=mainList.size()){
                return;
            }

            mainList.remove(pos);
            adapterRecyclerView.removeItem(pos);
            adapterRecyclerView.notifyItemRemoved(pos);
            adapterRecyclerView.notifyItemRangeChanged(pos,mainList.size());

        }




        @Override
        public boolean isLongPressDragEnabled() {
            return true;
        }

        @Override
        public boolean isItemViewSwipeEnabled() {
            return true;
        }
    };
    ItemTouchHelper itemTouchHelper = new ItemTouchHelper(callback);
    itemTouchHelper.attachToRecyclerView(playlistRecyclerView);

}

public void setupItemTouchHelper（）{
final ItemTouchHelper.Callback Callback=new ItemTouchHelper.Callback（）{
@凌驾
public int getMovementFlags（RecyclerView RecyclerView，RecyclerView.ViewHolder ViewHolder）{
AdapterRecyclView=（MusicAdapterRecyclView）RecyclView.getAdapter（）；
int dragFlags=ItemTouchHelper.UP | ItemTouchHelper.DOWN；
int swipeFlags=ItemTouchHelper.START | ItemTouchHelper.END；
返回makeMovementFlags（dragFlags、swipeFlags）；
}
@凌驾
公共布尔onMove（RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、RecyclerView.ViewHolder目标）{
int fromPosition=viewHolder.getAdapterPosition（）；
int-toPosition=target.getAdapterPosition（）；
如果（从位置<位置）{
for（inti=fromPosition；itoPosition；i--）{
集合交换（主列表，i，i-1）；
}
}
musicAdapterRecyclerView.notifyItemMoved（从位置、位置）；
返回true；
}
@凌驾
公共空间（RecyclerView.ViewHolder ViewHolder，int方向）{
final int pos=viewHolder.getAdapterPosition（）；
如果（pos=mainList.size（））{
返回；
}
删除主列表（pos）；
AdapterRecyclServiceView.removeItem（位置）；
adapterRecyclerView.notifyItemRemoved（pos）；
AdapterRecyclView.notifyItemRangeChanged（pos，mainList.size（））；
}
@凌驾
公共布尔值isLongPressDragEnabled（）{
返回true；
}
@凌驾
公共布尔值IsItemViewSwipEnabled（）{
返回true；
}
};
ItemTouchHelper ItemTouchHelper=新的ItemTouchHelper（回调）；
itemTouchHelper.attachToRecyclerView（播放循环视图）；
}

问题

当用户在recyclerView上滑动项目时，会更新mainList，滑动动画工作正常，但除非滚动recyclerView，否则不会更新它

未调用用于拖放（重新排列项目）的ItemTouchHelper的OnMove（）方法

---

您是否尝试过notifydatasetchanged（）？已经尝试过，但没有成功。@AliAsheer所有这些都已经写入了一个愚蠢的建议所给出的代码中，但我最终解决了您的问题，因为我也遇到了同样的问题。拖动项目时，只需在拖动之前长按项目。代码本身看起来不错。您是否尝试过notifydatasetchanged（）？已经尝试过了，但没有成功。@AliAsheer所有这些都已经写入了一个愚蠢的建议所给出的代码中，但我最终解决了您的问题，因为我也遇到了同样的问题。拖动项目时，只需在拖动之前长按项目。代码本身看起来不错。