java - 隐藏 View 时回收器 View 未取消选择

Question

我有一个显示四个数字的回收器 View 。 1,2,3,4。当我选择这些数字中的任何一个时，一切看起来都很好。问题是当我水平滚动并且其他数字填充我的屏幕时:4,5,6,7。

状态1

状态2

在此示例中，在状态 1 和 状态 2 之间来回滚动，当只应选择其中之一时，7 和 1 都会被选中

Question: How can I make it so that clicking one of the numbers deselects the number that isn't visible on screen?

适配器:

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder>{
private String[] days;
private String[] numbers;
SelectionTracker<Long> mSelectionTracker;
private static MyAdapter myAdapter;


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


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

@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;
        }
    }


    holder.bind(position, id, dayInit, numberInit, isSelected);
}

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, Long key, String dayInit, String numberInit, Boolean isSelected){
        scheduleDetails.position = position;
        scheduleDetails.identifier = key;

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

        dayView.setText(dayInit);
        numberView.setText(numberInit);
        view.setActivated(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;
    }
}

// Create new views (invoked by the layout manager)
@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 int getItemCount() {
    return days.length;
}

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

}

Answer 1

您可以覆盖 onViewRecycled方法在您的 RecyclerView.Adapter 类中并禁用那里的 View 。以下是基于您提供的代码的示例:

@Override
public void onViewRecycled(@NonNull MyViewHolder holder) {
    //disable activated view when it got recycle
    holder.view.setActivated(false)
    super.onViewRecycled(holder);
}

现在，每次回收 View 时，您都会取消选择它，并且当再次绑定(bind)此 View 时(在 MyViewHolder 类的 bind 方法中)，您将选择只有正确的观点。