На java
Есть основная Активити - MainActivity
Основной адаптер - MainRecyclerAdapter
демонстрирующий List sectionList;
Основной элемент - Section, содержащий :
String sectionName,
List sectionItems
Дочерний адаптер - ChildRecyclerAdapter
демонстрирующий List sectionItems
Возникла проблема определения позиции элемент. Все мои попытки вызывали хаотичное удаление элементов и непредсказуемое поведение адаптера с периодическим исключением IndexOutOfBoundException
Кто нибудь реализовывал подобное?
public class MainRecyclerAdapter extends RecyclerView.Adapter<MainRecyclerAdapter.ViewHolder> {
List<Section> sectionList;
ChildRecyclerAdapter childRecyclerAdapter;
public MainRecyclerAdapter(List<Section> sectionList) {
this.sectionList = sectionList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.section_row, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
Section section = sectionList.get(position);
String sectionName = section.getSectionName();
List<String> items = section.getSectionItems();
holder.sectionNameTextView.setText(sectionName);
childRecyclerAdapter = new ChildRecyclerAdapter(items);
holder.childRecyclerView.setAdapter(childRecyclerAdapter);
}
@Override
public int getItemCount() {
return sectionList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView sectionNameTextView;
RecyclerView childRecyclerView;
public ViewHolder(@NonNull final View itemView) {
super(itemView);
sectionNameTextView = itemView.findViewById(R.id.sectionNameTextView);
childRecyclerView = itemView.findViewById(R.id.childRecyclerView);
ItemTouchHelper helper = new ItemTouchHelper(
new MainRecyclerAdapter.ItemTouchHandler(getAdapterPosition(),
ItemTouchHelper.LEFT)
);
helper.attachToRecyclerView(childRecyclerView);
}
}
private class ItemTouchHandler extends ItemTouchHelper.SimpleCallback {
ItemTouchHandler(int dragDirs, int swipeDirs) {
super(dragDirs, swipeDirs);
}
@Override
public boolean onMove(@NonNull RecyclerView recyclerView, @NonNull RecyclerView.ViewHolder viewHolder, @NonNull RecyclerView.ViewHolder target) {
int from = viewHolder.getAdapterPosition();
int to = target.getAdapterPosition();
Collections.swap(sectionList.get(viewHolder.getAdapterPosition()).getSectionItems(), from, to);
notifyItemMoved(from, to);
return true;
}
@Override
public void onSwiped(@NonNull RecyclerView.ViewHolder viewHolder, int direction) {
//I don't understand how to determine the position
sectionList.get( ?? ).getSectionItems().remove(viewHolder.getAdapterPosition());
childRecyclerAdapter.notifyItemRemoved(viewHolder.getAdapterPosition());
}
}
}
Простой
