notifyDataSetChanged后，ItemTouchHelper.Callback项目关闭

Question

我已经实现了ItemTouchHelper.Callback，使按钮变得粘滞。一切正常，但是我有问题。 我的适配器调用notifyDataSetChanged（），然后打开元素将自身关闭。而且我不知道为什么以及如何预防。 我将很高兴知道该怎么做...

谢谢

enum ButtonsState {
    GONE,
    LEFT_VISIBLE,
    RIGHT_VISIBLE
}

class SwipeController extends ItemTouchHelper.Callback {

    private boolean swipeBack = false;

    private ButtonsState buttonShowedState = ButtonsState.GONE;

    private RectF buttonInstance = null;

    private RecyclerView.ViewHolder currentItemViewHolder = null;

    private SwipeControllerActions buttonsActions = null;

    private static final float buttonWidth = 300;
    private RecyclerView.ViewHolder tempViewHolder;

    public SwipeController(SwipeControllerActions buttonsActions) {
        this.buttonsActions = buttonsActions;
    }

    @Override
    public int getMovementFlags(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
        if (viewHolder instanceof PendingOrRecentItemViewHolder) {
            if (currentItemViewHolder != null && currentItemViewHolder != viewHolder && buttonShowedState == ButtonsState.LEFT_VISIBLE){
                tempViewHolder = viewHolder;
                clearData(recyclerView);
            }
            return makeMovementFlags(0, /*LEFT |*/RIGHT);
        } else {
            return makeMovementFlags(0, 0 /*LEFT |*/);
        }
    }

    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
        return true;
    }

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

    @Override
    public int convertToAbsoluteDirection(int flags, int layoutDirection) {
        if (swipeBack) {
            swipeBack = buttonShowedState != ButtonsState.GONE;
            return 0;
        }
        return super.convertToAbsoluteDirection(flags, layoutDirection);
    }

    @Override
    public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
        if (actionState == ACTION_STATE_SWIPE) {
            if (buttonShowedState != ButtonsState.GONE) {
                if (buttonShowedState == ButtonsState.LEFT_VISIBLE) dX = Math.max(dX, buttonWidth);
                super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            } else {
                setTouchListener(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
            }
        }

        if (buttonShowedState == ButtonsState.GONE) {
            super.onChildDraw(c, recyclerView, viewHolder, (float) (dX *0.7), dY, actionState, isCurrentlyActive);
        }
        if (tempViewHolder != null && buttonShowedState != ButtonsState.LEFT_VISIBLE) {
        } else {
            currentItemViewHolder = viewHolder;
        }
        drawButtons(c, viewHolder);
    }

    private void setTouchListener(final Canvas c, final RecyclerView recyclerView, final RecyclerView.ViewHolder viewHolder, final float dX, final float dY, final int actionState, final boolean isCurrentlyActive) {
        recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                swipeBack = event.getAction() == MotionEvent.ACTION_CANCEL || event.getAction() == MotionEvent.ACTION_UP;
                if (swipeBack) {

                    if (dX > buttonWidth) buttonShowedState = ButtonsState.LEFT_VISIBLE;

                    if (buttonShowedState != ButtonsState.GONE) {
                        setTouchDownListener(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
                        setItemsClickable(recyclerView, false);
                    }
                }
                return false;
            }
        });
    }

    private void setTouchDownListener(final Canvas c, final RecyclerView recyclerView, final RecyclerView.ViewHolder viewHolder, final float dX, final float dY, final int actionState, final boolean isCurrentlyActive) {
        recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    setTouchUpListener(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);
                }
                return false;
            }
        });
    }

    private void setTouchUpListener(final Canvas c, final RecyclerView recyclerView, final RecyclerView.ViewHolder viewHolder, final float dX, final float dY, final int actionState, final boolean isCurrentlyActive) {
        recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_UP) {
                    SwipeController.super.onChildDraw(c, recyclerView, viewHolder, 0F, dY, actionState, isCurrentlyActive);
                    clearData(recyclerView);
                }
                return false;
            }
        });
    }

    private void setItemsClickable(RecyclerView recyclerView, boolean isClickable) {
        for (int i = 0; i < recyclerView.getChildCount(); ++i) {
            recyclerView.getChildAt(i).setClickable(isClickable);
        }
    }

    private void drawButtons(Canvas c, RecyclerView.ViewHolder viewHolder) {
        float buttonWidthWithoutPadding = buttonWidth - 20;
        float corners = 16;

        View itemView = viewHolder.itemView;
        Paint p = new Paint();

        RectF leftButton = new RectF(itemView.getLeft(), itemView.getTop(), itemView.getLeft() + buttonWidthWithoutPadding, itemView.getBottom());
        p.setColor(Color.BLUE);
        c.drawRoundRect(leftButton, corners, corners, p);
        drawText("EDIT", c, leftButton, p);

        buttonInstance = null;
        if (buttonShowedState == ButtonsState.LEFT_VISIBLE) {
            buttonInstance = leftButton;
        }

    }

    private void drawText(String text, Canvas c, RectF button, Paint p) {
        float textSize = 60;
        p.setColor(Color.WHITE);
        p.setAntiAlias(true);
        p.setTextSize(textSize);

        float textWidth = p.measureText(text);
        c.drawText(text, button.centerX() - (textWidth / 2), button.centerY() + (textSize / 2), p);
    }

    public void onDraw(Canvas c, RecyclerView recyclerView) {
        if (currentItemViewHolder != null) {
            drawButtons(c, currentItemViewHolder);
        }
    }

    public RecyclerView.ViewHolder getCurrentItemViewHolder() {
        return currentItemViewHolder;
    }

    public ButtonsState getButtonShowedState() {
        return buttonShowedState;
    }

    public void clearData(RecyclerView recyclerView) {
        if (currentItemViewHolder != null) {
            recyclerView.setOnTouchListener(new View.OnTouchListener() {
                @Override
                public boolean onTouch(View v, MotionEvent event) {
                    return false;
                }
            });
            setItemsClickable(recyclerView, true);
            swipeBack = false;

            if (currentItemViewHolder != null) {
                clearView(recyclerView, currentItemViewHolder);
            }
            buttonShowedState = ButtonsState.GONE;
            currentItemViewHolder = null;
            if (tempViewHolder != null){
                Log.d("swipe: ", "tempViewHolder: tempViewHolder: " + tempViewHolder + " state: " + buttonShowedState);
                getMovementFlags(recyclerView, tempViewHolder);
                tempViewHolder = null;
            }
        }
    }
}