[英]Recyclerview-selection select sometimes 2 items when I long click
我創建了一個使用 StaggeredGridLayoutManager 作為 LayoutManager 的 recyclerview。
由於 recyclerview-selection 庫,我想實現多項選擇,但是當我長按某個項目時,它有時會選擇 2。(我正在使用數據庫來檢索數據)
這是我的主要代碼:
GridRecyclerView notesRecyclerView = binding.noteRecyclerView;
notesRecyclerView.setHasFixedSize(true);
adapter = new NoteAdapterTest();
notesRecyclerView.setAdapter(adapter);
SelectionTracker<Long> tracker = new SelectionTracker.Builder<>("mySelection", notesRecyclerView,
new StableIdKeyProvider(notesRecyclerView),
new NoteDetailsLookup(notesRecyclerView),
StorageStrategy.createLongStorage())
.withSelectionPredicate(SelectionPredicates.createSelectAnything()).build();
adapter.setSelectionTracker(tracker);
我的適配器:
private SelectionTracker<Long> selectionTracker;
private static final DiffUtil.ItemCallback<Note> DIFF_CALLBACK = new DiffUtil.ItemCallback<Note>() {
@Override
public boolean areItemsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
return oldItem.getId() == newItem.getId();
}
@Override
public boolean areContentsTheSame(@NonNull Note oldItem, @NonNull Note newItem) {
return oldItem.getTitle().equals(newItem.getTitle()) && oldItem.getContent().equals(newItem.getContent());
}
};
public NoteAdapterTest() {
super(DIFF_CALLBACK);
setHasStableIds(true);
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
AdapterNoteBinding binding = AdapterNoteBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false);
return new NoteHolder(binding);
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
Note note = getItem(position);
((NoteHolder) holder).bind(note, selectionTracker.isSelected((long) position));
}
public static class NoteHolder extends RecyclerView.ViewHolder {
private final AdapterNoteBinding binding;
public NoteHolder(@NonNull AdapterNoteBinding binding) {
super(binding.getRoot());
this.binding = binding;
}
public final void bind(Note note, boolean isActive) {
Context context = binding.getRoot().getContext();
itemView.setActivated(isActive);
if (isActive) {
binding.noteAdapterLayout.getBackground().setTint(context.getColor(R.color.blue));
} else {
binding.noteTitle.setText(note.getTitle());
}
}
public ItemDetailsLookup.ItemDetails<Long> getItemDetails() {
return new ItemDetailsLookup.ItemDetails<Long>() {
@Override
public int getPosition() {
return getAdapterPosition();
}
@Nullable
@Override
public Long getSelectionKey() {
return getItemId();
}
};
}
}
@Override
public long getItemId(int position) {
return position;
}
public void setSelectionTracker(SelectionTracker<Long> selectionTracker) {
this.selectionTracker = selectionTracker;
}
}
我的查找:
public class NoteDetailsLookup extends ItemDetailsLookup<Long> {
private final RecyclerView recyclerView;
public NoteDetailsLookup(RecyclerView recyclerView) {
this.recyclerView = recyclerView;
}
@Nullable
@Override
public ItemDetails<Long> getItemDetails(@NonNull MotionEvent e) {
View view = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (view != null) {
RecyclerView.ViewHolder viewHolder = recyclerView.getChildViewHolder(view);
if (viewHolder instanceof NoteAdapterTest.NoteHolder) {
return ((NoteAdapterTest.NoteHolder) viewHolder).getItemDetails();
}
}
return null;
}
}
你怎么知道有 2 個項目被選中? 選擇跟蹤器返回什么?
嘗試始終在您的視圖持有者中設置背景色調:
if (isActive) {
binding.noteAdapterLayout.getBackground().setTint(context.getColor(R.color.blue));
} else {
binding.noteAdapterLayout.getBackground().setTint(context.getColor(R.color.white)); // your default color
}
這可能只是一個視圖 state 問題。
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