找不到接受参数类型“androidx.lifecycle.livedata”的~itembinding~的setter<

k2arahey  于 2021-07-08  发布在  Java
关注(0)|答案(2)|浏览(405)

找不到<the_derek.dogstuff.databinding.dogitembinding的setterapp:product>接受参数类型“androidx.lifecycle.livedata<the_derek.dogstuff.db.entity.dogentity>”的。如果绑定适配器提供setter,请检查适配器是否正确注解,以及参数类型是否匹配。
我已经连续两天浏览我的应用程序了。我使用google提供的“basicsample”android room应用程序来模拟我自己的应用程序,但是当我把它包含在dog\ u fragment.xml中时出现了这个错误

<include
 layout="@layout/dog_item"
 app:product="@{dogViewModel.dog}" />

“dog\u item”布局(dog\u item.xml)用于显示狗的列表,当您单击它时,它会将您带到狗的详细信息屏幕(dog\u fragment.xml)。没有它,一切工作都很好,但它错过了“狗”瓷砖发挥到细节屏幕,并将只显示一个清单咀嚼玩具。
狗的碎片.xml

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto">

  <data>
    <import type="android.view.View" />

    <variable
      name="isLoading"
      type="boolean" />

    <variable
      name="dogViewModel"
      type="the_derek.dogstuff.viewmodel.DogViewModel" />
  </data>

  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/cardview_light_background"
    android:orientation="vertical">

    <include
      layout="@layout/dog_item"
      app:product="@{dogViewModel.dog}" />

    <FrameLayout
      android:layout_width="match_parent"
      android:layout_height="match_parent">

      <TextView
        android:id="@+id/tv_loading_chew_toys"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/loading_chew_toys"
        app:visibleGone="@{isLoading}" />

      <FrameLayout
        android:id="@+id/chew_toys_list_wrapper"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <androidx.recyclerview.widget.RecyclerView
          android:id="@+id/chew_toy_list"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:contentDescription="@string/cd_chew_toys_list"
          app:layoutManager="LinearLayoutManager"
          app:visibleGone="@{!isLoading}" />
      </FrameLayout>
    </FrameLayout>
  </LinearLayout>
</layout>

dogfragment.java文件

public class DogFragment extends Fragment {

 private static final String TAG = "\t\tDogFragment";
 private static final String KEY_DOG_ID = "dog_id";

 private final ChewToyClickCallback mChewToyClickCallback =
   chewToy -> {
    // no-op
   };
 private DogFragmentBinding mBinding;
 private ChewToyAdapter mChewToyAdapter;

 public static DogFragment forDog(int dogId) {
  DogFragment fragment = new DogFragment();
  Bundle args = new Bundle();
  args.putInt(KEY_DOG_ID, dogId);
  fragment.setArguments(args);
  return fragment;
 }

 @Nullable
 @Override
 public View onCreateView(
   @NonNull LayoutInflater inflater,
   @Nullable ViewGroup container,
   @Nullable Bundle savedInstanceState) {
  mBinding = DataBindingUtil.inflate(inflater, R.layout.dog_fragment, container, false);

  mChewToyAdapter = new ChewToyAdapter(mChewToyClickCallback);
  mBinding.chewToyList.setAdapter(mChewToyAdapter);
  return mBinding.getRoot();
 }

 @Override
 public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
  DogViewModel.Factory factory =
    new DogViewModel.Factory(
      requireActivity().getApplication(), requireArguments().getInt(KEY_DOG_ID));
  final DogViewModel model =
    new ViewModelProvider(this, factory).get(DogViewModel.class);

  mBinding.setLifecycleOwner(getViewLifecycleOwner());
  mBinding.setDogViewModel(model);

  subscribeToModel(model);
 }

 private void subscribeToModel(final DogViewModel model) {
  model
    .getChewToys()
    .observe(
      getViewLifecycleOwner(),
      chewToyEntities -> {
       if (chewToyEntities != null) {
        mBinding.setIsLoading(false);
        mChewToyAdapter.submitList(chewToyEntities);
       } else {
        mBinding.setIsLoading(true);
       }
      });
 }

 @Override
 public void onDestroyView() {
  mBinding = null;
  mChewToyAdapter = null;
  super.onDestroyView();
 }
}

dogviewmodel.java文件

public class DogViewModel extends AndroidViewModel {

  private static final String TAG = "\t\tDogViewModel";
  private final LiveData<DogEntity> mObservableDog;
  private final LiveData<List<ChewToyEntity>> mObservableChewToys;

  public DogViewModel(
      @NonNull Application application, DataRepository repository, final int dogId) {
    super(application);
    mObservableChewToys = repository.loadChewToysById(dogId);
    mObservableDog = repository.loadDog(dogId);
  }

  public LiveData<List<ChewToyEntity>> getChewToys() {
    return mObservableChewToys;
  }

  public LiveData<DogEntity> getDog() {
    return mObservableDog;
  }

  public static class Factory extends ViewModelProvider.NewInstanceFactory {

    @NonNull private final Application mApplication;

    private final int mDogId;

    private final DataRepository mRepository;

    public Factory(@NonNull Application application, int dogId) {
      mApplication = application;
      mDogId = dogId;
      mRepository = ((DogApp) application).getRepository();
    }

    @SuppressWarnings("unchecked")
    @Override
    @NonNull
    public <T extends ViewModel> T create(@NonNull Class<T> modelClass) {
      return (T) new DogViewModel(mApplication, mRepository, mDogId);
    }
  }
}

绑定适配器.java

public class BindingAdapters {
  @BindingAdapter("visibleGone")
  public static void showHide(View view, boolean show) {
    view.setVisibility(show ? View.VISIBLE : View.GONE);
  }
}

dogclickcallback.java文件

public interface DogClickCallback {
 void onClick(Dog dog);
}

dao查询

@Query("select * from dog_table where id = :dogId")
LiveData<DogEntity> loadDog(int dogId);

dogadapter.java文件

public class DogAdapter extends RecyclerView.Adapter<DogAdapter.DogViewHolder> {
 private static final String TAG = "\t\tDogAdapter";

 @Nullable private final DogClickCallback mDogClickCallback;
 List<? extends Dog> mDogList;

 public DogAdapter(@Nullable DogClickCallback clickCallback) {
   Log.i(TAG, "DogAdapter: public constructor");
   mDogClickCallback = clickCallback;
   setHasStableIds(true);
 }

 public void setDogList(final List<? extends Dog> dogList) {
   if (mDogList == null) {
    mDogList = dogList;
    notifyItemRangeInserted(0, dogList.size());
   } else {
    DiffUtil.DiffResult result =
       DiffUtil.calculateDiff(
          new DiffUtil.Callback() {
            @Override
            public int getOldListSize() {
             return mDogList.size();
            }
            @Override
            public int getNewListSize() {
             return dogList.size();
            }
            @Override
            public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
             return mDogList.get(oldItemPosition).getId()
                == dogList.get(newItemPosition).getId();
            }
            @Override
            public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
             Dog newDog = dogList.get(newItemPosition);
             Dog oldDog = mDogList.get(oldItemPosition);
             return newDog.getId() == oldDog.getId()
                && TextUtils.equals(newDog.getName(), oldDog.getName());
            }
          });
    mDogList = dogList;
    result.dispatchUpdatesTo(this);
   }
 }

 @Override
 @NonNull
 public DogViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
   DogItemBinding binding =
      DataBindingUtil.inflate(
         LayoutInflater.from(parent.getContext()), R.layout.dog_item, parent, false);
   binding.setCallback(mDogClickCallback);
   return new DogViewHolder(binding);
 }

 @Override
 public void onBindViewHolder(@NonNull DogViewHolder holder, int position) {
   holder.binding.setDog(mDogList.get(position));
   holder.binding.executePendingBindings();
 }

 @Override
 public int getItemCount() {
   return mDogList == null ? 0 : mDogList.size();
 }

 @Override
 public long getItemId(int position) {
   return mDogList.get(position).getId();
 }

 static class DogViewHolder extends RecyclerView.ViewHolder {
   final DogItemBinding binding;
   public DogViewHolder(DogItemBinding binding) {
    super(binding.getRoot());
    this.binding = binding;
   }
 }
}

(dogentity也有dog模型类,如果有帮助的话)我尝试过使缓存失效/重新启动,我尝试过清理项目,重建项目。我启动了一个新项目,并将我的文件复制到其中。哦,另外,这是一个错误:

import the_derek.dogstuff.databinding.DogFragmentBindingImpl;

它告诉我它无法解决dogfragmentbindingpimpl我不知道它是如何生成的,但我假设问题是相互交织的。我不知道我是否错过了任何代码,可以帮助,请让我知道。
(模仿)android架构组件示例

krugob8w

krugob8w1#

所以我每天花6-8个小时在这上面,不知道花了多长时间,一行一行地浏览我的代码,它神奇地自我修复了。。。有点。
我放弃了希望,打算把精力转移到其他地方,并试图解决这个问题,所以我从驱动器中删除了我的项目文件夹,然后从版本控制(从我的个人项目)中执行new->project,错误不再存在。即使重建项目,清理缓存等等。。。解决了问题。它一定不想重建或重新创建bts文件,不管我如何修改代码或xml文件,但当它感觉到一个全新的项目时,它会重新构建它们。
可能是android studio中的一个bug?

ulmd4ohb

ulmd4ohb2#

您正在此处传入一个livedata对象:

app:product="@{dogViewModel.dog}"

你需要通过:

app:product="@{dogViewModel.dog.value}"

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