如何解决如何手动刷新实时数据
我不了解如何手动实施刷新实时数据。在我的情况下,用户经常面临连接问题,因为回收者视图不显示任何数据。我想给滑动刷新布局刷新实时数据。 这是我的数据源
class CourseRemoteDataSource @Inject constructor(private val service: ApiService) :
BaseDataSource() {
suspend fun fetchFeaturedCourses() =
getResult {
service.getFeaturedCourses(
SharedPreferencesManager(App.getContext()).getToken()!!
)
}
}
这是存储库
@Singleton
class CourseRepository @Inject constructor(
private val dao: CourseDao,private val remoteSource: CourseRemoteDataSource
) {
val featuredCourses = resultLiveData(
databaseQuery = { dao.getFeaturedCourses() },networkCall = { remoteSource.fetchFeaturedCourses() },saveCallResult = { dao.insertFeaturedCourses(it.result) }
)
}
这是我的视图模型
class FeaturedCoursePageViewModel @Inject constructor(private val repository: CourseRepository) :
ViewModel() {
val courses = repository.featuredCourses
override fun onCleared() {
super.onCleared()
}
}
这是我的片段
class FeaturedCoursePageFragment : Fragment(),Injectable {
@Inject
lateinit var viewModelFactory: ViewModelProvider.Factory
private lateinit var viewModelFeatured: FeaturedCoursePageViewModel
private lateinit var binding: FragmentCourseFeaturedBinding
private lateinit var adapter: FeaturedCoursePageAdapter
companion object {
fun newInstance(): Fragment {
val args = Bundle()
val fragment = FeaturedCoursePageFragment()
fragment.arguments = args
return fragment
}
}
override fun onCreateView(
inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?
): View? {
viewModelFeatured = injectViewModel(viewModelFactory)
binding = FragmentCourseFeaturedBinding.inflate(inflater,container,false)
context ?: return binding.root
return binding.root
}
override fun onViewCreated(view: View,savedInstanceState: Bundle?) {
super.onViewCreated(view,savedInstanceState)
adapter = FeaturedCoursePageAdapter()
binding.recyclerViewCourseFeatured.adapter = adapter
binding.swipeRefreshLayoutCourseFeatured.setColorSchemeResources(R.color.colorPrimary)
binding.swipeRefreshLayoutCourseFeatured.setOnRefreshListener {
subscribeInterface()
}
subscribeInterface()
}
private fun subscribeInterface() {
viewModelFeatured.courses.observe(viewLifecycleOwner,{ result ->
when (result.status) {
Result.Status.SUCCESS -> {
binding.progressBarCourseFeatured.hide()
result.data?.let {
if (it.isEmpty()) binding.linearLayoutEmptyPlaceholder.show() else binding.linearLayoutEmptyPlaceholder.hide()
adapter.submitList(it)
}
binding.swipeRefreshLayoutCourseFeatured.stop()
}
Result.Status.LOADING -> {
binding.progressBarCourseFeatured.show()
binding.linearLayoutEmptyPlaceholder.hide()
binding.swipeRefreshLayoutCourseFeatured.start()
}
Result.Status.ERROR -> {
binding.progressBarCourseFeatured.hide()
if (result.code == 204) {
binding.linearLayoutEmptyPlaceholder.show()
}
binding.swipeRefreshLayoutCourseFeatured.stop()
}
}
})
}
}
我尝试了一些技巧,但livedata返回了旧数据。 在此之前,请帮助我解决这个关键问题。
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