如何在网络调用 Android 后更新适配器
[英]How to update an adapter after a network call Android
问题描述
I'm using Kotlin with databinding and MVVM architecture.
我正在使用具有数据绑定和 MVVM 架构的 Kotlin。 I'm having difficulty getting my adapter to populate data on my layout using a listAdapter.我很难让我的适配器使用 listAdapter 在我的布局上填充数据。 I have to use a listAdapter due to the library I'm using (so no recyclerView unfortunately).由于我正在使用的库，我必须使用 listAdapter（不幸的是没有 recyclerView）。 Here's my code:这是我的代码：
MainActivityViewModel.kt MainActivityViewModel.kt
class MainActivityViewModel : ViewModel() {
private val movieService: MovieService = RetrofitBuilder.createService()
fun getMovieData(): ArrayList<MovieDataModel> {
val call = movieService.getCurrentlyPlayingMovies(API_KEY)
val movieList = ArrayList<MovieDataModel>(10)
call.enqueue(object : Callback<MovieDataResponse> {
override fun onResponse(call: Call<MovieDataResponse>, response: Response<MovieDataResponse>) {
for (i in 0 until 10) {
movieList.add(response.body()?.results?.get(i)!!)
}
}
override fun onFailure(call: Call<MovieDataResponse>, t: Throwable) {
}
})
return movieList
}
}
MainActivity.kt MainActivity.kt
class MainActivity : AppCompatActivity() {
lateinit var binding : ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
val mainActivityViewModel = ViewModelProviders.of(this).get(MainActivityViewModel::class.java)
binding.viewModel = mainActivityViewModel
val movieAdapter = MovieAdapter(binding.viewModel!!.getMovieData(), this)
binding.wheelview.adapter = movieAdapter
}
}
MovieApiModels.kt MovieApiModels.kt
class MovieDataResponse(val results: List<MovieDataModel>)
class MovieDataModel(val title: String, val overview: String, val release_date: String, val vote_count: String)
activity_main.xml activity_main.xml
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">
<data>
<variable
name="viewModel"
type="com.lucasbrandt.movieselector.MainActivityViewModel"/>
</data>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.lukedeighton.wheelview.WheelView
android:id="@+id/wheelview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:wheelColor="@color/colorPrimary"
app:rotatableWheelDrawable="false"
app:selectionAngle="90.0"
app:wheelOffsetY="60dp"
app:repeatItems="true"
app:wheelRadius="200dp"
app:wheelItemCount="10"
app:wheelPadding="13dp"
app:wheelItemRadius="43dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"/>
</android.support.constraint.ConstraintLayout>
</layout>
JSON Sample JSON 样品
{
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],
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"release_date": "2019-10-04"
},
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Every time I try to get data populated to the layout (wheelview) it shows nothing.每次我尝试将数据填充到布局（车轮视图）时，它什么都不显示。 I realize there's probably a race condition here, but I'm not sure how to solve it.我意识到这里可能存在竞争条件，但我不知道如何解决它。 In case it is useful, here is a link to the library I'm using (wheelview): https://github.com/LukeDeighton/WheelView如果有用，这里是我正在使用的库的链接（wheelview）： https://github.com/LukeDeighton/WheelView
1 个解决方案
解决方案1
1 已采纳 2019-11-08 20:44:24
Your getMovieData() return empty list as enqueue is asynchronous.您的getMovieData()返回空列表，因为enqueue是异步的。 That's why data not populated in your view.这就是您的视图中未填充数据的原因。
Try using LiveData .尝试使用LiveData 。
class MainActivityViewModel : ViewModel() {
val movieLiveList: MutableLiveData<ArrayList<MovieDataModel>> = MutableLiveData()
...
fun getMovieData() {
val call = movieService.getCurrentlyPlayingMovies(API_KEY)
val movieList = ArrayList<MovieDataModel>(10)
call.enqueue(object : Callback<MovieDataResponse> {
override fun onResponse(call: Call<MovieDataResponse>, response: Response<MovieDataResponse>) {
for (i in 0 until 10) {
movieList.add(response.body()?.results?.get(i)!!)
}
movieLiveList.postValue(movieList)
}
override fun onFailure(call: Call<MovieDataResponse>, t: Throwable) {
}
})
}
}
And then inside Activity observe the live data and update list accordingly.然后在 Activity 内部观察实时数据并相应地更新列表。
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
val mainActivityViewModel = ViewModelProviders.of(this).get(MainActivityViewModel::class.java)
binding.viewModel = mainActivityViewModel
val movieList = arrayListOf<MovieDataModel>()
val movieAdapter = MovieAdapter(movieList, this)
binding.wheelview.adapter = movieAdapter
mainActivityViewModel.movieLiveList.observe(this, Observer { movies ->
movieList = movies
movieAdapter.notifyDataSetChanged()
})
}
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