![](/img/trans.png)
[英]Cannot be cast to Model in Recycler View adater in onBindViewHolder
[英]Recycler View not calling onBindviewHolder
当我尝试在回收器视图中选择一个元素时,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(7 个元素中有 4 个正在显示,当用户向右移动时,3 个元素交替显示)。 通常,当用户单击元素 OnBindViewHolder 时应该会触发,但对我来说却没有发生。 它唯一触发的时间是初始化。 由于它不会触发,因此我无法单击回收器视图中的任何元素。 也许这可能与我的布局有关? 我不知道
我的适配器
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;
}
解决了
@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 变量中(我使用了 setHasStableIds)。 此实现不需要单击侦听器。 这是针对 androidx recyclerview-selection 库
最后我在 MyViewHolder 中声明了这些:
scheduleDetails.position = 位置; scheduleDetails.identifier = 键;
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.