java - Recycler View 不调用 onBindviewHolder

Question

当我尝试在回收器 View 中选择一个元素时，不会调用 OnBindViewHolder。我使用的是水平布局，所有元素最初都没有显示(显示 7 个元素中的 4 个，当用户向右移动时，这 3 个元素交替出现)。通常，当用户单击一个元素时，OnBindViewHolder 应该会触发，但它不会发生在我身上。它唯一一次触发是在初始化时。因为它没有触发，所以我无法单击回收器 View 中的任何元素。也许这可能与我的布局有关？我不确定

MyAdapter

public MyAdapter(){
    this.setHasStableIds(true);
}


//Set Keys
public void setSelectionTracker(SelectionTracker<Long> selectionTracker) {
    this.mSelectionTracker = selectionTracker;
}

public static class MyViewHolder extends RecyclerView.ViewHolder{
    public TextView dayView, numberView;
    public View view;
    ScheduleDetails scheduleDetails = new ScheduleDetails();

    public MyViewHolder(View itemView){
        super(itemView);
        view = itemView;
        dayView = itemView.findViewById(R.id.day);
        numberView = itemView.findViewById(R.id.day_number);
    }

    void bind(int position, String dayInit, String numberInit, Boolean isSelected){
        scheduleDetails.position = position;
        System.out.println("Hit2: " + scheduleDetails.position);

        dayView.setText(dayInit);
        numberView.setText(numberInit);
        view.setSelected(isSelected);

    }

    public ItemDetailsLookup.ItemDetails<Long> getItemDetails(@NonNull MotionEvent motionEvent){
        return scheduleDetails;
    }
}

static class ScheduleDetails extends ItemDetailsLookup.ItemDetails<Long>{
    int position;
    Long identifier;

    @Override
    public int getPosition() {
        return position;
    }

    @Nullable
    @Override
    public Long getSelectionKey() {
        return identifier;
    }

    @Override
    public boolean inSelectionHotspot(@NonNull MotionEvent e){
        return true;
    }
}

public MyAdapter(String[] day, String[] number){
    days = day;
    numbers = number;
}


@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.recycler_layout, parent, false);

    MyViewHolder vh = new MyViewHolder(view);
    return vh;
}


@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    String dayInit = days[position];
    String numberInit = numbers[position];
    Long positions = (long) position;

    System.out.println("Position: " + position);

    boolean isSelected = false;
    if(mSelectionTracker != null){
        if(mSelectionTracker.isSelected(positions)){
            isSelected = true;
        }
        holder.bind(position, dayInit, numberInit, isSelected);
    }
}

// Return the size of your dataset (invoked by the layout manager)
@Override
public int getItemCount() {
    return days.length;
}

@Override
public long getItemId(int position) {
    return position;
}

Answer 1

已解决

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
    String dayInit = days[position];
    String numberInit = numbers[position];
    Long id = getItemId(position);

    boolean isSelected = false;
    if(mSelectionTracker != null) {
        if (mSelectionTracker.isSelected(id)) {
            isSelected = true;
        }
    }

    System.out.println("Here: " + isSelected);
    holder.bind(position, id, dayInit, numberInit, isSelected);
}

@Override
public long getItemId(int position) {
    return position;
}

我从 getItemId 检索位置并将其放入我的 id 变量(我使用 setHasStableIds)。此实现不需要点击监听器。这是针对 androidx recyclerview-selection 库

最后我在 MyViewHolder 中声明了这些:

scheduleDetails.position = position; scheduleDetails.identifier = key;