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我目前的问题是，LoadStateAdapter显示加载和错误状态的 my 不在 my 内居中recyclerview，它有一个 gridlayout 作为布局管理器。我在官方 android 开发者网站上没有找到任何关于此的信息，所以我在这里问：如何将我的LoadStateAdapter内部集中在我的 Recyclerview 中？

当前的

分段

@AndroidEntryPoint
class ShopFragment : Fragment(R.layout.fragment_shop), ShopAdapter.OnItemClickListener {
    private val shopViewModel: ShopViewModel by viewModels()
    private val shopBinding: FragmentShopBinding by viewBinding()
    @Inject lateinit var shopListAdapter: ShopAdapter

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        bindObjects()
    }

    private fun bindObjects() {
        shopBinding.adapter = shopListAdapter.withLoadStateFooter(ShopLoadAdapter(shopListAdapter::retry))
        shopListAdapter.clickHandler(this)
    }

    override fun onDestroyView() {
        requireView().findViewById<RecyclerView>(R.id.rv_shop).adapter = null
        super.onDestroyView()
    }
}

适配器

@FragmentScoped
class ShopLoadAdapter(private val retry: () …

目前，我正在为我的原始数据存储编写一些测试。我在这里遇到的唯一问题是我无法调用特定函数，因为这样我的测试就会失败/崩溃。我发现这非常令人困惑，因为我的所有其他功能似乎都有效，除了resetDatastore

这是我的代码：

存储库

private companion object {
    private const val SHOP_FILTER_PRODUCT_DATASTORE: String = "shop_filter_product_datastore_test"
    private const val SHOP_FILTER_LIST_DATASTORE: String = "shop_filter_list_datastore_test"
    private const val SHOP_FILTER_BTN_DATASTORE: String = "shop_filter_btn_datastore_test"
}

private val testNonVolatileProductDataStore = context.createDataStore(
    fileName = SHOP_FILTER_PRODUCT_DATASTORE,
    serializer = ShopFilterProductSerializer
)

private val testNonVolatileListDataStore = context.createDataStore(
    fileName = SHOP_FILTER_LIST_DATASTORE,
    serializer = ShopFilterListSerializer
)

private val testNonVolatileBtnDataStore = context.createDataStore(
    fileName = SHOP_FILTER_BTN_DATASTORE,
    serializer = ShopFilterBtnSerializer
)

override suspend fun setValueProduct(newProduct: ShopFilterTempHolder) {
    if (newProduct.id == null || newProduct.mQuery == null) …

我的问题非常简单明了：两个注释/示例有什么区别：

例一

@Singleton
class MySingletonClass() {}

@Module
@InstallIn(FragmentComponent::class)
abstract class MyFragmentModule {
   @Provides
   fun provideMySingletonClass() = MySingletonClass()
}

实例二

class MySingletonClass() {}

@Module
@InstallIn(FragmentComponent::class)
abstract class MyFragmentModule {

   @Singleton
   @Provides
   fun provideMySingletonClass() = MySingletonClass()
}

我知道的唯一区别是，第二个示例给出了以下错误：

error: [Dagger/IncompatiblyScopedBindings] FragmentC scoped with @dagger.hilt.android.scopes.FragmentScoped may not reference bindings with different scopes:

这是否意味着@Singleton示例一中的注释被简单地忽略了？

使用数据存储一段时间并用它编写一些业务逻辑后，我想测试使用数据存储的类/存储库。我遇到的问题是，我该怎么做？context.createDatastore(...)我尝试使用测试上下文创建一个，但我遇到了一些错误。没有关于此的官方文档，或者至少我找不到。

这是我目前的方法：

界面

interface ShopFilterDataStoreRepository {
    val shopFilterProduct: Flow<ShopFilterProduct>
    val shopFilterList: Flow<ShopFilterList>

    suspend fun setValueProduct(newProduct: ShopFilterTempHolder)
    suspend fun setValueList(newList: ShopFilterTempHolder)
}

实现（生产中使用的默认实现）

class ShopFilterDataStoreRepositoryImpl @Inject constructor(
    @ApplicationContext private val context: Context,
) : ShopFilterDataStoreRepository {

    private companion object {
        private const val SHOP_FILTER_PRODUCT_DATASTORE: String = "shop_filter_product_datastore"
        private const val SHOP_FILTER_LIST_DATASTORE: String = "shop_filter_list_datastore"
    }

    // this causes error because test context != applicationcontext
    private val nonVolatileProductDataStore = context.createDataStore(
        fileName = SHOP_FILTER_PRODUCT_DATASTORE,
        serializer = ShopFilterProductSerializer
    )

    // this causes …

突然，我的应用程序中的导航突然无法正常工作（昨天确实有效）。

这是一个示例：当我从 导航userLoggedInFragment到 时userLoggedOutFragment，使用参数app:popUpTo="@id/userLoggedOutFragment" app:popUpToInclusive="true"，然后单击后退按钮，即使我使用了 popUpTo，它仍然会将我导航回 userLoggedInFragment。然后我得到信息：

I/NavController: Ignoring popBackStack to destination com.example.app:id/userLoggedOutFragment as it was not found on the current back stack

这是我的片段代码

用户登录片段

@AndroidEntryPoint
class UserLoggedInFragment : Fragment() {
    private var _binding: FragmentUserLoggedInBinding? = null
    private val binding: FragmentUserLoggedInBinding get() = _binding!!
    private val viewModel: LogoutViewModel by viewModels()

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentUserLoggedInBinding.inflate(inflater, container, false)
        return binding.root
    }

    override fun onViewCreated(view: View, …