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
2条答案
按热度按时间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?
ulmd4ohb2#
您正在此处传入一个livedata对象:
你需要通过: