"Already executed" 错误（Retrofit2 和 Android）

Question

首先，我有 2 个片段，它们显示不同的 json 值（2 个链接）。如果我更改片段（.replace（）），该片段将通过改造获取值并显示它。它运行良好，但其他片段被删除了值。更改片段后，它会再次下载，所以我更改了结构。我想取 2 个 json 对象一次，所以我在 mainactivity 中得到 json 个对象，片段用方法得到这些对象。它们在第一次打开时运行良好，但如果我第二次打开片段，则会出现此错误。我该如何解决？

java.lang.IllegalStateException: Already executed.
at retrofit2.OkHttpCall.enqueue(OkHttpCall.java:84)

代码很长，我会展示主要结构。

MainActivity.java

public class MainActivity extends AppCompatActivity
{
    private Call<Restaurant[]> restaurantCall;
    private Call<Dining[]> diningCall;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Restaurant Json value
        RestaurantInterface restaurantInterface = RetroClient.getClient().create(RestaurantInterface.class);
        restaurantCall = restaurantInterface.getJsonValues();

        //Dininghall Json value
        DiningInterface diningInterface = RetroClient.getClient().create(DiningInterface.class);
        diningCall = diningInterface.getJsonValues();
    }
    public Call<Restaurant[]> RestaurantJson()
    {
        return this.restaurantCall;
    }

    public Call<Dining[]> DiningJson()
    {
        return this.diningCall;
    }
}

RestaurantFragment.java (Other fragment has same structure)

public class RestFragment extends Fragment
{

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_rest, container, false);

        Call<Restaurant[]> call = ((MainActivity) getActivity()).RestaurantJson();

        call.enqueue(new Callback<Restaurant[]>()
        {
            .
            .

Answer 1

总结一下，为了避免"Already executed"异常，克隆调用：

public Call<Restaurant[]> RestaurantJson()
{
    return this.restaurantCall.clone();
}

public Call<Dining[]> DiningJson()
{
    return this.diningCall.clone();
}

如果您想在 activity 中执行调用，而不是像您实际执行的那样在片段中执行，那么您需要在 activity 中调用 enqueue(new Callbak(...。所以你需要这样的东西：

public class RestFragment extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_rest, container, false);

        ((MainActivity) getActivity()).RestaurantJson(this);
    }

     public void onResponse(Response<T> response) {
         //your fragment code on response
     } 
    ...
}

public class MainActivity extends AppCompatActivity {

    public void RestaurantJson(final RestFragment fragment)
    {
        RestaurantInterface restaurantInterface = RetroClient.getClient().create(RestaurantInterface.class);
        restaurantCall = restaurantInterface.getJsonValues();
        restaurantCall.enqueue(new Callback<Restaurant[]>() {

        @Override
        public void onResponse(Call<T> call, Response<T> response) {
            ...
            fragment.onResponse(response);
        }
    }
    ...
}

您的 DiningFragment 和您的就餐电话也是如此...

"Already executed" 错误（Retrofit2 和 Android）

"Already executed" error (Retrofit2 and Android)

android

android-fragments

android-fragmentactivity

retrofit

retrofit2