android - 在提交 fragment 时显示API响应

Question

当我在searchview上搜索时，我想将搜索值发送到api，它将返回一个我想在片段上显示的响应。因此，当我提交搜索时，我想显示带有响应的片段!我试图制作一个函数来呈现片段，但我认为即时通讯完全错误...
我是乞gg，这是一个学校项目，谢谢您的帮助!

SearchView

 override fun onCreateOptionsMenu(menu: Menu): Boolean {
    // Inflate the menu; this adds items to the action bar if it is present.
    menuInflater.inflate(R.menu.main, menu)

    val manager = getSystemService(Context.SEARCH_SERVICE) as SearchManager
    val searchItem = menu.findItem(R.id.action_search)
    val searchView = searchItem?.actionView as SearchView

    searchView.setSearchableInfo(manager.getSearchableInfo(componentName))

    searchView.setOnQueryTextListener(object: SearchView.OnQueryTextListener{
        override fun onQueryTextSubmit(query: String?): Boolean {
            searchView.clearFocus()
            searchView.setQuery("",false)
            searchItem.collapseActionView()
            return true
        }

        override fun onQueryTextChange(newText: String?): Boolean {
            return false
        }
    })
    return true
}

数据类

 data class SearchPost(val searchKey: String)

片段

  class SendFragment : Fragment() {

var newList: MutableList<News> = mutableListOf<News>()

companion object {
    fun newInstance() = SendFragment()
}

private lateinit var viewModel: SendViewModel

override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
): View? {
    return inflater.inflate(R.layout.fragment_searched, container, false)
}

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    viewModel = ViewModelProviders.of(this).get(SendViewModel::class.java)



    recyclerView.setHasFixedSize(true)
    recyclerView.layoutManager = LinearLayoutManager(this.context)


    // TODO: Use the ViewModel

    val searchedObserver = Observer<List<News>>
    {
        // Access the RecyclerView Adapter and load the data into it
            newList -> recyclerView.adapter = NewsAdapter(newList,this.context!!)

    }

    viewModel.getNewSearched().observe(this, searchedObserver)

}
 }

片段 View 模型

 class SendViewModel : ViewModel() {

// TODO: Implement the ViewModel

private var newList: MutableLiveData<List<News>> = MutableLiveData()



fun getNewSearched(): MutableLiveData<List<News>>
{

    searchedNew()

    return newList;

}

private fun searchedNew()
{
    val retrofit = Retrofit.Builder()
        .baseUrl("http://192.168.1.78:3000")
        .addConverterFactory(GsonConverterFactory.create())
        .build()

    val api = retrofit.create(ApiService::class.java)
    val searchPost = SearchPost("this is want to be the query")
    api.sendSearch(searchPost).enqueue(object : Callback<List<News>> {
        override fun onResponse(call: Call<List<News>>, response: Response<List<News>>) {
            newList.value=(response.body()!!)
        }

        override fun onFailure(call: Call<List<News>>, t: Throwable) {
            Log.d("fail", "onFailure:")
        }
    })

}
 }

Api界面

interface ApiService {
@POST("/search")
fun sendSearch(@Body searchPost: SearchPost): Call<List<News>>


  }

Answer 1

观察这样的 View 模型:

 viewModel.getNewSearched().observe(this, Observer<MutableList<List<News>>> {
      myNewsData ->
        Log.d("print my data", myNewsData) // first try to print this data whether data is coming or not
      recyclerView.adapter = NewsAdapter( myNewsData ,this.context!!)
    })

初始化您的searchView:

private fun initSearchView() {
    search_view.setOnQueryTextListener(object :
        androidx.appcompat.widget.SearchView.OnQueryTextListener {
        override fun onQueryTextSubmit(newText: String?): Boolean {
            viewMode.getNewSearched()  // call your api here

            return false  // don,t change it to true
        }

        override fun onQueryTextChange(query: String?): Boolean {
            return false
        }
    })
}

最后，我应该将文本传递给要搜索的viewmodel

override fun onQueryTextSubmit(query: String?): Boolean {

  viewMode.getNewSearched(query)  

在侧 View 模型中:

fun getNewSearched(textYouWantToSearch :String): MutableLiveData<List<News>>
{
    searchedNew(textYouWantToSearch) // same pass in searchedNew() else your data class is always blank
    return newList;
}

据我了解，您要在改造调用中传递的数据类始终为空，因为您没有从任何地方传递任何值，您应该使用搜索方法的查询字符串并尝试将其作为参数传递。