[英]RecyclerView notifyDatasetChanged not working when notifyDatasetchanged in anonymous class method
[英]recyclerview notifyDataSetChanged() is not working
我正在嘗試使用 updateList() 中的 notifyDataSetchanged() 更新 myadapter。但不適用於 recyclerview。 我可以在 updateList() 中看到列表大小及其顯示的實際結果,但只有 reclerview 沒有更新。這個 class 是在 MVVM 設計模式中設計的。
public class TasksAdapter extends RecyclerView.Adapter<TasksAdapter.TasksAdapterViewHolder> {
private static final String TAG = TasksAdapter.class.getSimpleName();
static ArrayList<ItemModel> list;
static Context mContext;
private Fragment fragment;
private int row_index = -1;
private SessionManager session;
// SelectColorVM colorVM;
public TasksAdapter(Fragment fragment, Context context, ArrayList<ItemModel> itemList) {
this.mContext = context;
this.list = itemList;
this.fragment = fragment;
session = new SessionManager(fragment.getContext());
}
public void updateList(ArrayList<ItemModel> itemList){
list.clear();
this.list = itemList;
notifyDataSetChanged();
}
@Override
public TasksAdapterViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
TasksItemBinding binding =
DataBindingUtil.inflate(LayoutInflater.from(parent.getContext()), R.layout.tasks_item,
parent, false);
return new TasksAdapter.TasksAdapterViewHolder(binding);
}
@Override
public void onBindViewHolder(TasksAdapterViewHolder holder, final int position) {
holder.binding.setViewModel(list.get(position));
if(position == 0 && list.get(position).btnText.get().toString().length() > 0)
holder.binding.btnUpdate.setVisibility(View.VISIBLE);
else
holder.binding.btnUpdate.setVisibility(View.INVISIBLE);
holder.binding.layoutItem.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// row_index = position;
// notifyDataSetChanged();
Fragment fragment = new DetailFragment();
FragmentManager manager = ((FragmentActivity) mContext).getSupportFragmentManager();
FragmentTransaction fragmentTransaction = manager.beginTransaction();
Bundle bundle = new Bundle();
ItemModel item = list.get(position);
bundle.putSerializable("item", item);
fragment.setArguments(bundle);
fragmentTransaction.replace(R.id.id_frame, fragment, "details");
fragmentTransaction.addToBackStack("details");
fragmentTransaction.commit();
}
});
holder.binding.btnUpdate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
HashMap<String, String> user = session.getUserDetails();
if(list.get(position).btnText.get().equals("Task Start")){
LandingEngine.updateStatusAndSetStartTimeForRequest(fragment, user.get(SessionManager.KEY_CLEANER_ID), list.get(position).sid.get().toString());
} else if(list.get(position).btnText.get().equals("Task Complete")){
LandingEngine.updateStatusAndSetCompleteTimeForRequest(fragment, user.get(SessionManager.KEY_CLEANER_ID), list.get(position).sid.get().toString());
}
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public static class TasksAdapterViewHolder extends RecyclerView.ViewHolder {
TasksItemBinding binding;
public TasksAdapterViewHolder(TasksItemBinding rowbinding) {
super(rowbinding.getRoot());
this.binding = rowbinding;
}
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getItemViewType(int position) {
return position;
}
}
我正在從我的片段中調用適配器,如下所示
if(list.size() > 0) {
if(adapter == null) {
view.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(fragment.getContext());
view.setLayoutManager(mLayoutManager);
adapter = new TasksAdapter(fragment, fragment.getContext(), list);
view.setAdapter(adapter);
view.addItemDecoration(new DividerItemDecoration(fragment.getContext()));
} else {
adapter.updateList(list);
// view.getAdapter().notifyDataSetChanged();
// view.invalidate();
}
}
請檢查一下,讓我知道我哪里做錯了。在此先感謝..
最后,一旦從 volley 庫中獲得 API 響應,它就會通過從片段類調用此方法來工作。
我在 ViewModel 類中編寫了以下方法。
public void updateList(ArrayList<Class> list){
if(adapter != null) {
adapter.updateList(list);
}
}
並從片段類調用此方法,如下所示。
ArrayList<StatisticsModel> list = (ArrayList) data;
viewModel.updateList(list);
所以在適配器類中更新方法如下。
public void updateList(ArrayList<StatisticsModel> itemList){
list.clear();
// this.list = itemList;
// list.addAll(itemList);
// notifyItemInserted(list.size());
// notifyDataSetChanged();
this.list.addAll(itemList);
// notifyItemInserted(list.size());
notifyDataSetChanged();
}
不要
public void updateList(ArrayList<ItemModel> itemList)
{
list.clear();
this.list = itemList;
notifyDataSetChanged();
}
list.clear();
清除所有值。clear() 方法用於從列表中刪除所有元素。
做
public void updateList(ArrayList<ItemModel> itemList)
{
this.list.addAll(itemList);
notifyDataSetChanged();
}
我遇到了同樣的問題,你在這方面做錯了,將列表更改為 itemList:
@Override
public int getItemCount() {
return itemList.size();
}
試試這個
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
view.adapter.notifyDataSetChanged();
}
});
試試這個刪除list.clear();
來自您的updateList
方法
public void updateList(ArrayList<ItemModel> itemList){
this.list.addAll(itemList);
notifyItemInserted(list.size());
notifyDataSetChanged();
}
notifyItemInserted(int position)
通知任何注冊的觀察者在位置反射的項目已被新插入。
也試試這個
list.addAll(your new list);
if (adapter == null) {
view.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(fragment.getContext());
view.setLayoutManager(mLayoutManager);
adapter = new TasksAdapter(fragment, fragment.getContext(), list);
view.setAdapter(adapter);
view.addItemDecoration(new DividerItemDecoration(fragment.getContext()));
} else {
view.notifyItemInserted(list.size());
view.notifyDataSetChanged();
}
嘗試在您的Fragment
類中添加notifyDataSetChanged()
,例如...
adapter.notifyDataSetChanged();
有同樣的問題。 就我而言,logcat RecyclerView 中有錯誤消息:沒有附加布局管理器; 跳過布局
我已經用以下代碼修復了
LinearLayoutManager llm = new LinearLayoutManager(this.getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(llm);
然后 notifyDataSetChanged 開始工作
我不知道為什么有時我們不創建適配器的兩個實例,而且我們在主線程適配器上。notifyDataSetChanged() 不工作在這種情況下,只需從適配器 class 調用 notifyDataSetChanged() 方法。
adapter.setNewValue(newlist)
在 AdapterClass 上
fun setNewValue(newlist:ArrayList<Any>) {
list = newlist
notifyDataSetChanged()
}
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