响应的改造MVVM延迟

发布于 2025-02-05 05:54:43 字数 2613 浏览 2 评论 0原文

我在片段中实现了回收器视图,该视图将根据在搜索视图中输入的文本进行更新。在搜索视图中输入的文本很快就在MainAttivity中。我在存储库中调用OnQueryTextChange(EnteredText),并根据输入的文本从API中获取数据。它发生在实时

问题上:

我一旦调用存储库中的QueryTextChange就无法从存储库中返回,该数据将调用API并将数据设置为MutableBableLive数据并返回实时数据。但是我从存储库中获取零值,因为API调用需要一些时间来获取数据。我如何解决这个问题以实现我想要的东西。

我目前正在尝试通过..

MainAttivity ->包含搜索视图
片段 - >包含RecyClerview

MainActivity

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            model.queryTextChange(query,getString(R.string.api_key));
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            
            model.queryTextChange(newText,getString(R.string.api_key));
            return false;
        }
    });

我的视图模型:

private String API_KEY = "";

// This is observed from fragment
public MutableLiveData<SearchGifs> gifList = new MutableLiveData<>();


public HomeViewModel(String api_key) {
    this.API_KEY = api_key;
}

GifRepo gifRepo = new GifRepo();


public void queryTextChange(String text, String key){

    //Calls the repo and updates the mutablelivedata which is observed from fragment
     gifList.postValue(gifRepo.queryTextChange(text,key).getValue());
}

存储库:

public MutableLiveData<SearchGifs> queryTextChange(String text, String api_key) {

    MutableLiveData<SearchGifs> list = new MutableLiveData<>();

    Call<SearchGifs> gifSearch = service.search(api_key,text);

    gifSearch.enqueue(new Callback<SearchGifs>() {
        @Override
        public void onResponse(Call<SearchGifs> call, Response<SearchGifs> response) {
            //getting data here perfectly
            list.postValue(response.body());

        }

        @Override
        public void onFailure(Call<SearchGifs> call, Throwable t) {

        }
    });
    //doesn't wait for api call and returning null
    return list;

}

fragment :(在哪里应该更新回收库)

    @Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    
    //Not Getting triggered 
    model.gifList.observe(requireActivity(), new Observer<SearchGifs>() {
        @Override
        public void onChanged(SearchGifs gifs) {
       
            //RecyclerViewData will be updated here
        }
    });

I implemented a recycler view in a fragment which will be updated based on the text entered in searchview. As soon a text entered in searchview which is in MainActivity. I'm calling onQueryTextChange(enteredText) in repository and fetching data from API based on the text entered. it happens in realtime

The Problem :

I'm unable to return the data fetched from repositoty as soon as i call the queryTextChange in repository which will call the api and set the data to the mutablelive data and returns the live data. but im getting null value from repository as the api call takes some time to fetch the data. How do i solve this issue to achieve what i wanted.

I'm currently trying to achieve this via..

MainActivity --> contains Searchview
Fragment --> contains recyclerview

MainActivity

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
        @Override
        public boolean onQueryTextSubmit(String query) {
            model.queryTextChange(query,getString(R.string.api_key));
            return false;
        }

        @Override
        public boolean onQueryTextChange(String newText) {
            
            model.queryTextChange(newText,getString(R.string.api_key));
            return false;
        }
    });

My View Model:

private String API_KEY = "";

// This is observed from fragment
public MutableLiveData<SearchGifs> gifList = new MutableLiveData<>();


public HomeViewModel(String api_key) {
    this.API_KEY = api_key;
}

GifRepo gifRepo = new GifRepo();


public void queryTextChange(String text, String key){

    //Calls the repo and updates the mutablelivedata which is observed from fragment
     gifList.postValue(gifRepo.queryTextChange(text,key).getValue());
}

Repository :

public MutableLiveData<SearchGifs> queryTextChange(String text, String api_key) {

    MutableLiveData<SearchGifs> list = new MutableLiveData<>();

    Call<SearchGifs> gifSearch = service.search(api_key,text);

    gifSearch.enqueue(new Callback<SearchGifs>() {
        @Override
        public void onResponse(Call<SearchGifs> call, Response<SearchGifs> response) {
            //getting data here perfectly
            list.postValue(response.body());

        }

        @Override
        public void onFailure(Call<SearchGifs> call, Throwable t) {

        }
    });
    //doesn't wait for api call and returning null
    return list;

}

Fragment: (Where it should update the recyclerview)

    @Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    
    //Not Getting triggered 
    model.gifList.observe(requireActivity(), new Observer<SearchGifs>() {
        @Override
        public void onChanged(SearchGifs gifs) {
       
            //RecyclerViewData will be updated here
        }
    });

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