1

我正在尝试从服务器获取数据并在回收站视图中显示它。我正在使用改造库和 RxJava2，但它无法从服务器获取数据。

它在 LogCat 中显示以下行：

E/RecyclerView: No adapter attached; skipping layout

来自服务器的响应：

[
  {
    "term_id": "4",
    "name": "Entertainment"
  },
  {
    "term_id": "5",
    "name": "Tech & Gadgets"
  },
  {
    "term_id": "6",
    "name": "Sports"
  },
  {
    "term_id": "7",
    "name": "Health and Fitness Tips"
  }
]

下面是我的代码：

RetrofitClient.java

public class RetrofitClient {

private static Retrofit retrofit = null;

public static Retrofit getInstance(){


    OkHttpClient okHttpClient = new OkHttpClient.Builder()
            .connectTimeout(22,TimeUnit.SECONDS)
            .readTimeout(22, TimeUnit.SECONDS)
            .writeTimeout(22, TimeUnit.SECONDS)
            .build();

    if(retrofit == null)
        retrofit = new Retrofit.Builder()
                .baseUrl("https://www.flypped.com/api/")
                .addConverterFactory(GsonConverterFactory.create(new GsonBuilder().setLenient().create()))
                .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
                .client(okHttpClient)
                .build();

    return retrofit;

  }

}

ApiService.class

public interface ApiService {

@GET("Categoery_api")
Observable<List<Model>> getData();
}

模型.java

public class Model {

@SerializedName("catId")
@Expose
String catId;

@SerializedName("catName")
@Expose
String catName;

public Model(){

}

public Model(String catId, String catName) {
    this.catId = catId;
    this.catName = catName;
}

public String getCatId() {
    return catId;
}

public void setCatId(String catId) {
    this.catId = catId;
}

public String getCatName() {
    return catName;
}

public void setCatName(String catName) {
    this.catName = catName;
}

}

MainActivity.java

private void fetchData(){

    Retrofit retrofit = RetrofitClient.getInstance();
    ApiService myApi = retrofit.create(ApiService.class);

     myApi.getData().subscribeOn(Schedulers.io())
                                           .observeOn(AndroidSchedulers.mainThread())
                                           .subscribe(new Observer<List<Model>>() {
                                               @Override
                                               public void onSubscribe(Disposable d) {
                                                   d.dispose();
                                               }

                                               @Override
                                               public void onNext(List<Model> models) {

                                                   if(models.size() > 0){

                                                       progress.setVisibility(View.INVISIBLE);

                                                      adapter = new PostAdapter(getApplicationContext(),list);
                                                       recycler.setAdapter(adapter);
                                                   }
                                               }

                                               @Override
                                               public void onError(Throwable e) {

                                                   Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
                                               }

                                               @Override
                                               public void onComplete() {


                                               }
                                           });

                           }

PostAdapter.java

public class PostAdapter extends RecyclerView.Adapter<PostAdapter.ViewHolder> {

List<Model> list = new ArrayList<>();
Context context;

public PostAdapter(Context context,List<Model> list) {
    this.context = context;
    this.list = list;
}

@NonNull
@Override
public PostAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

    View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_row,parent,false);

    ViewHolder view = new ViewHolder(v);
    return view;
}

@Override
public void onBindViewHolder(@NonNull PostAdapter.ViewHolder holder, int position) {

    Model model = list.get(position);

    holder.catName.setText(model.getCatName());
    holder.catId.setText(model.getCatId());
}

@Override
public int getItemCount() {
    return list.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {

    TextView catId,catName,comp,titl;

    public ViewHolder(@NonNull View itemView) {
        super(itemView);

        catId = itemView.findViewById(R.id.catId);
        catName = itemView.findViewById(R.id.catName);
    }
  }
}

有人请让我知道我做错了什么，任何帮助将不胜感激。

谢谢

4

1 回答 1

1

您正在调用d.dispose();其中onSubscribe将处置资源和结果，因此删除处置调用为

public void onSubscribe(Disposable d) {
    //d.dispose(); remove it
}

当活动（或片段）将从内存中删除时，您可以进入dispose以释放资源（JIC 请求仍在运行），并确保您在回收站视图上设置了布局管理器。onDestroy

于 2020-02-22T19:48:52.623 回答