使用ListAdapter的android recyclerview中缺少默认动画

我正在使用recyclerview和扩展ListAdapter的适配器。我正在通过调整提交列表来更新内容。但每次内容更新（例如删除一个项目）时，recyclerview都会消失一秒钟，并与更新的内容一起重新出现。有两件事我不喜欢：第一是闪烁，第二是缺少默认动画

如何修复并显示平滑默认动画

适配器：

public class AdapterFlightRecords extends ListAdapter<FlightRecordListItem, RecyclerView.ViewHolder> {

    private FlightRecordListItem mRecentlyDeletedItem;
    private int mRecentlyDeletedItemPosition;

    private class ViewHolderFlightRecord extends RecyclerView.ViewHolder {
        private RvItemFlightRecordsBinding binding;

        private ViewHolderFlightRecord(final RvItemFlightRecordsBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }

        private void bind(final EntityFlightRecord flightRecord){
            binding.setFlightRecord(flightRecord);
            binding.executePendingBindings();
        }
    }

    public class ViewHolderDate extends RecyclerView.ViewHolder {
        private RvItemFlightRecordsDateBinding binding;

        private ViewHolderDate(final RvItemFlightRecordsDateBinding binding) {
            super(binding.getRoot());
            this.binding = binding;
        }

        private void bind(final DateFlightRecordsListItem item){
            OffsetDateTime date = item.getDate();
            binding.setYearMonth(YearMonth.from(date));
            binding.executePendingBindings();
        }
    }

    public AdapterFlightRecords(){
        super(new FlightRecordsDiffCallback());
    }

    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        switch(viewType){
            case 1:
                return new ViewHolderDate(RvItemFlightRecordsDateBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
            case 2:
                return new ViewHolderFlightRecord(RvItemFlightRecordsBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
            default:
                throw new RuntimeException("No such viewType");
        }

        //return new ViewHolderFlightRecord(RvItemFlightRecordsBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false));
    }

    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
        switch(holder.getItemViewType()){
            case 1:
                DateFlightRecordsListItem date = (DateFlightRecordsListItem) getItem(position);
                ((ViewHolderDate) holder).bind(date);
                break;
            case 2:
                EntityFlightRecord flightRecord = (EntityFlightRecord) getItem(position);
                ((ViewHolderFlightRecord) holder).bind(flightRecord);
                holder.itemView.setTag(flightRecord);
                break;
        }
    }

    @Override
    public int getItemViewType(int position) {
        // Just as an example, return 0 or 2 depending on position
        // Note that unlike in ListView adapters, types don't have to be contiguous
        return getItem(position).getType().getValue();
    }

    public EntityFlightRecord getItemFromList(int position){
            return (EntityFlightRecord) getItem(position);
    }

    /*private View.OnClickListener createOnClickListener(int id) {
        return view -> {
            QuestionnaireFragmentDirections.ActionQuestionnaireFragmentToSubjectFragment action = QuestionnaireFragmentDirections.actionQuestionnaireFragmentToSubjectFragment(id);
            Navigation.findNavController(view).navigate(action);
        };
    }*/
}

class FlightRecordsDiffCallback extends DiffUtil.ItemCallback<FlightRecordListItem> {

    @Override
    public boolean areItemsTheSame(@NonNull FlightRecordListItem oldItem, @NonNull FlightRecordListItem newItem) {
        //TODO implement equals and hashcode in Questionnaire
        return false;
        //return oldItem.id == newItem.id;
    }

    @Override
    public boolean areContentsTheSame(@NonNull FlightRecordListItem oldItem, @NonNull FlightRecordListItem newItem) {
        //TODO implement equals and hashcode in Questionnaire
        return false;
        //return oldItem.equals(newItem);
    }
}

SwipeToDeleteCallback：

public class SwipeToDeleteCallback extends ItemTouchHelper.SimpleCallback {

private Drawable icon;
private ColorDrawable background;
private OnItemSwipeListener onItemSwipeListener;
private boolean swipeEnabled;

private SwipeToDeleteCallback(int dragDirs, int swipeDirs) {
    super(dragDirs, swipeDirs);
}

private SwipeToDeleteCallback(Builder builder) {
    this(builder.dragDirs, builder.swipeDirs);
    background = builder.bgColorSwipe;
    icon = builder.drawableSwipe;
    swipeEnabled = builder.swipeEnabled;
    onItemSwipeListener = builder.onItemSwipeListener;
}

@Override public boolean isItemViewSwipeEnabled() {
    return swipeEnabled;
}

@Override
public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
    if (viewHolder instanceof AdapterFlightRecords.ViewHolderDate) return 0;
    return super.getSwipeDirs(recyclerView, viewHolder);
}

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

@Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    int position = viewHolder.getAdapterPosition();
    onItemSwipeListener.onItemSwiped(position);
}

@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
    super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

    View itemView = viewHolder.itemView;
    int backgroundCornerOffset = 20; //so background is behind the rounded corners of itemView

    int iconMargin = (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
    int iconTop = itemView.getTop() + (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
    int iconBottom = iconTop + icon.getIntrinsicHeight();

    if (dX > 0) { // Swiping to the right
        int iconLeft = itemView.getLeft() + iconMargin;
        int iconRight = itemView.getLeft() + icon.getIntrinsicWidth() + iconMargin;
        icon.setBounds(iconLeft, iconTop, iconRight, iconBottom);

        background.setBounds(itemView.getLeft(), itemView.getTop(),
                itemView.getLeft() + ((int) dX) + backgroundCornerOffset, itemView.getBottom());
    } else if (dX < 0) { // Swiping to the left
        int iconLeft = itemView.getRight() - iconMargin - icon.getIntrinsicWidth();
        int iconRight = itemView.getRight() - iconMargin;
        icon.setBounds(iconLeft, iconTop, iconRight, iconBottom);

        background.setBounds(itemView.getRight() + ((int) dX) - backgroundCornerOffset,
                itemView.getTop(), itemView.getRight(), itemView.getBottom());
    } else { // view is unSwiped
        background.setBounds(0, 0, 0, 0);
    }

    background.draw(c);
    icon.draw(c);
}

public interface OnItemSwipeListener {
    void onItemSwiped(int position);
}

public static final class Builder {
    private int dragDirs, swipeDirs;
    private Drawable drawableSwipe;
    private ColorDrawable bgColorSwipe;
    private OnItemSwipeListener onItemSwipeListener;
    private boolean swipeEnabled;

    public Builder(int dragDirs, int swipeDirs) {
        this.dragDirs = dragDirs;
        this.swipeDirs = swipeDirs;
    }

    public Builder drawableSwipe(Drawable val) {
        drawableSwipe = val;
        return this;
    }

    public Builder bgColorSwipe(ColorDrawable val) {
        bgColorSwipe = val;
        return this;
    }

    public Builder onItemSwipeListener(OnItemSwipeListener val) {
        onItemSwipeListener = val;
        return this;
    }

    public Builder setSwipeEnabled(boolean val) {
        swipeEnabled = val;
        return this;
    }

    public SwipeToDeleteCallback build() {
        return new SwipeToDeleteCallback(this);
    }
}
}

公共类SwipeToDeleteCallback扩展了ItemTouchHelper.SimpleCallback{
私人绘图图标；
私人彩色背景；
私有OnItemSwipeListener OnItemSwipeListener；
私有布尔可交换；
专用SwipeToDeleteCallback（int-dragDirs、int-swipeDirs）{
超级（dragDirs、swipeDirs）；
}
专用SwipeToDeleteCallback（生成器生成器）{
这（builder.dragDirs、builder.swipiders）；
背景=builder.bgColorSwipe；
icon=builder.drawableSwipe；
SwipEnabled=builder.SwipEnabled；
onItemSwipeListener=builder.onItemSwipeListener；
}
@重写公共布尔值IsItemViewSwipEnabled（）{
返回开关已启用；
}
@凌驾
public int getSwipeDirs（RecyclerView RecyclerView，RecyclerView.ViewHolder ViewHolder）{
if（AdapterLightRecords.ViewHolderDate的viewHolder实例）返回0；
返回super.getswipiders（recyclerView、viewHolder）；
}
@凌驾
公共布尔onMove（RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、RecyclerView.ViewHolder目标）{
返回false；
}
@覆盖已擦除的公共void（RecyclerView.ViewHolder ViewHolder，int方向）{
int position=viewHolder.getAdapterPosition（）；
onItemSwipeListener.onItemSwiped（位置）；
}
@凌驾
public void onChildraw（画布c、RecyclerView RecyclerView、RecyclerView.ViewHolder ViewHolder、float dX、float dY、int actionState、boolean isCurrentlyActive）{
super.onchildraw（c、recyclerView、viewHolder、dX、dY、actionState、isCurrentlyActive）；
View itemView=viewHolder.itemView；
int backgroundCornerOffset=20；//因此背景位于itemView的圆角后面
int iconMargin=（itemView.getHeight（）-icon.getIntrinsicHeight（））/2；
int iconTop=itemView.getTop（）+（itemView.getHeight（）-icon.getIntrinsicHeight（））/2；
int iconBottom=iconTop+icon.getIntrinsicHeight（）；
如果（dX>0）{//向右滑动
int iconLeft=itemView.getLeft（）+iconMargin；
int iconRight=itemView.getLeft（）+icon.getIntrinsicWidth（）+iconMargin；
icon.setBounds（iconLeft、iconTop、iconRight、iconBottom）；
background.setBounds（itemView.getLeft（），itemView.getTop（），
itemView.getLeft（）+（（int）dX）+backgroundCornerOffset，itemView.getBottom（））；
}如果（dX<0）{//向左滑动，则为else
int iconLeft=itemView.getRight（）-iconMargin-icon.getIntrinsicWidth（）；
int iconRight=itemView.getRight（）-iconMargin；
icon.setBounds（iconLeft、iconTop、iconRight、iconBottom）；
background.setBounds（itemView.getRight（）+（（int）dX）-backgroundCornerOffset，
itemView.getTop（）、itemView.getRight（）、itemView.getBottom（））；
}否则{//视图将不被擦除
背景.背景（0,0,0,0）；
}
背景图（c）；
图标绘制（c）；
}
公共接口侦听器{
无效（内部位置）；
}
公共静态最终类生成器{
私人内特德拉格迪尔、瑞士人；
私人提款刷卡；
私人彩绘bgColorSwipe；
私有OnItemSwipeListener OnItemSwipeListener；
私有布尔可交换；
公共建筑商（国际德拉格迪尔、国际瑞士）{
this.dragDirs=dragDirs；
this.swipiders=swipiders；
}
公共生成器可提取滑动（可提取val）{
drawableSwipe=val；
归还这个；
}
公共生成器bgColorSwipe（可着色val）{
bgColorSwipe=val；
归还这个；
}
公共生成器onItemSwipeListener（onItemSwipeListener val）{
mswipelistener=val；
归还这个；
}
公共生成器已启用（布尔值）{
SwipEnabled=val；
归还这个；
}
公共SwipeToDeleteCallback生成（）{
返回新的SwipeToDeleteCallback（此）；
}
}
}

我猜一定有任何一行代码会抑制默认动画，但是在哪里呢

我找到了此线程，但没有解决我的问题：

---

对照我的代码检查您的代码后，FlightRecordsDiffCallback类中出现问题 尝试在代码中取消对return语句的注释，并删除默认值-return false。 在我的代码中-动画无法正常工作，因为我经常在两个返回状态之间混合：

@Override
公共布尔项相同（…）

@覆盖
公共布尔值的内容相同（…）

这让我检查了你的代码，我认为问题在于，你使用return false，而不是在newItem和oldItem之间创建一个布尔返回。

@BindingAdapter(value = {"swipeEnabled", "drawableSwipe", "bgColorSwipe", "onItemSwipe"}, requireAll = false)
    public static void setItemSwipeToRecyclerView(RecyclerView recyclerView, boolean swipeEnabled, Drawable drawableSwipe, ColorDrawable bgColorSwipe,
                                                  SwipeToDeleteCallback.OnItemSwipeListener onItemSwipe) {

        ItemTouchHelper.Callback swipeCallback = new SwipeToDeleteCallback
                .Builder(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT)
                .bgColorSwipe(bgColorSwipe)
                .drawableSwipe(drawableSwipe)
                .setSwipeEnabled(swipeEnabled)
                .onItemSwipeListener(onItemSwipe)
                .build();

        ItemTouchHelper itemTouchHelper = new ItemTouchHelper(swipeCallback);
        itemTouchHelper.attachToRecyclerView(recyclerView);
    }

public class SwipeToDeleteCallback extends ItemTouchHelper.SimpleCallback {

private Drawable icon;
private ColorDrawable background;
private OnItemSwipeListener onItemSwipeListener;
private boolean swipeEnabled;

private SwipeToDeleteCallback(int dragDirs, int swipeDirs) {
    super(dragDirs, swipeDirs);
}

private SwipeToDeleteCallback(Builder builder) {
    this(builder.dragDirs, builder.swipeDirs);
    background = builder.bgColorSwipe;
    icon = builder.drawableSwipe;
    swipeEnabled = builder.swipeEnabled;
    onItemSwipeListener = builder.onItemSwipeListener;
}

@Override public boolean isItemViewSwipeEnabled() {
    return swipeEnabled;
}

@Override
public int getSwipeDirs(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder) {
    if (viewHolder instanceof AdapterFlightRecords.ViewHolderDate) return 0;
    return super.getSwipeDirs(recyclerView, viewHolder);
}

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

@Override public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
    int position = viewHolder.getAdapterPosition();
    onItemSwipeListener.onItemSwiped(position);
}

@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
    super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive);

    View itemView = viewHolder.itemView;
    int backgroundCornerOffset = 20; //so background is behind the rounded corners of itemView

    int iconMargin = (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
    int iconTop = itemView.getTop() + (itemView.getHeight() - icon.getIntrinsicHeight()) / 2;
    int iconBottom = iconTop + icon.getIntrinsicHeight();

    if (dX > 0) { // Swiping to the right
        int iconLeft = itemView.getLeft() + iconMargin;
        int iconRight = itemView.getLeft() + icon.getIntrinsicWidth() + iconMargin;
        icon.setBounds(iconLeft, iconTop, iconRight, iconBottom);

        background.setBounds(itemView.getLeft(), itemView.getTop(),
                itemView.getLeft() + ((int) dX) + backgroundCornerOffset, itemView.getBottom());
    } else if (dX < 0) { // Swiping to the left
        int iconLeft = itemView.getRight() - iconMargin - icon.getIntrinsicWidth();
        int iconRight = itemView.getRight() - iconMargin;
        icon.setBounds(iconLeft, iconTop, iconRight, iconBottom);

        background.setBounds(itemView.getRight() + ((int) dX) - backgroundCornerOffset,
                itemView.getTop(), itemView.getRight(), itemView.getBottom());
    } else { // view is unSwiped
        background.setBounds(0, 0, 0, 0);
    }

    background.draw(c);
    icon.draw(c);
}

public interface OnItemSwipeListener {
    void onItemSwiped(int position);
}

public static final class Builder {
    private int dragDirs, swipeDirs;
    private Drawable drawableSwipe;
    private ColorDrawable bgColorSwipe;
    private OnItemSwipeListener onItemSwipeListener;
    private boolean swipeEnabled;

    public Builder(int dragDirs, int swipeDirs) {
        this.dragDirs = dragDirs;
        this.swipeDirs = swipeDirs;
    }

    public Builder drawableSwipe(Drawable val) {
        drawableSwipe = val;
        return this;
    }

    public Builder bgColorSwipe(ColorDrawable val) {
        bgColorSwipe = val;
        return this;
    }

    public Builder onItemSwipeListener(OnItemSwipeListener val) {
        onItemSwipeListener = val;
        return this;
    }

    public Builder setSwipeEnabled(boolean val) {
        swipeEnabled = val;
        return this;
    }

    public SwipeToDeleteCallback build() {
        return new SwipeToDeleteCallback(this);
    }
}
}