我正在构建一个电影应用程序。有一个与父大小匹配的回收器视图，以及 1 个搜索操作按钮（SearchView）。
当我搜索电影时，一切正常，但是当我改变方向时，活动就失去了它的状态。recyclerview 变成空的，我需要再次搜索电影。
我正在使用 MVVM，我知道它不会发生..
谢谢！
这是存储库：
class MainRepository {
private val searchAfterMutableLiveData = MutableLiveData<List<Movie>>()
private val apiService : GetFromApi = APIService.retrofitClientRequest
private val apiKey = "censored"
fun searchAfter(searchAfter : String) : MutableLiveData<List<Movie>>{
apiService.searchAfter(apiKey,searchAfter)?.enqueue(object : Callback<MovieListResult?> {
override fun onResponse(
call: Call<MovieListResult?>,
response: Response<MovieListResult?>
) {
if (response.isSuccessful){
searchAfterMutableLiveData.value = response.body()?.moviesResults
Log.e("SearchMovieListResults","Result: ${searchAfterMutableLiveData.value}")
}
}
override fun onFailure(call: Call<MovieListResult?>, t: Throwable) {
Log.e("SearchMovieListResults","Failed: ${t.message}")
}
})
return searchAfterMutableLiveData
}
}
这是视图模型：
class MainViewModel : ViewModel(){
fun getMovieBySearch(searchAfter : String) : LiveData<List<Movie>>{
return mainRepository.searchAfter(searchAfter)
}
}
这是主活动：
class MainActivity : AppCompatActivity() {
private val mainViewModel : MainViewModel by viewModels()
private lateinit var mainRecyclerView : RecyclerView
private lateinit var mainAdapter : MainRecyclerViewAdapter
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
initRecyclerView()
}
private fun initRecyclerView() {
mainRecyclerView = findViewById(R.id.mainRecyclerView)
mainRecyclerView.setHasFixedSize(true)
mainRecyclerView.layoutManager = GridLayoutManager(this,1)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
menuInflater.inflate(R.menu.main_menu,menu)
val searchView = menu.findItem(R.id.menu_search_movie).actionView as androidx.appcompat.widget.SearchView
searchView.queryHint = "Search By Name,Actor .."
searchView.setOnQueryTextListener(object : androidx.appcompat.widget.SearchView.OnQueryTextListener {
override fun onQueryTextSubmit(whileTextChange: String?): Boolean {
//Clear SearchView
searchView.isIconified = true
searchView.setQuery("", false)
searchView.onActionViewCollapsed()
mainViewModel.getMovieBySearch(whileTextChange.toString()).observe(this@MainActivity,object : Observer<List<Movie>?> {
override fun onChanged(newList: List<Movie>?) {
if (newList != null) {
mainAdapter = MainRecyclerViewAdapter(newList)
mainRecyclerView.adapter = mainAdapter
//mainAdapter.changeCurrentList(newList)
}
}
})
return false
}
override fun onQueryTextChange(whileTextChange: String?): Boolean {
Log.e("onQueryTextChange","Text: $whileTextChange")
return false
}
})
return true
}
}