RxAndroid 网络调用使应用程序滞后于后退导航

Posted 2023-03-22

【中文标题】RxAndroid 网络调用使应用程序滞后于后退导航

【英文标题】：RxAndroid network calls makes the app lagging on back navigation

【发布时间】：2020-05-31 09:52:23

【问题描述】：

在我实现网络调用后，我的 android 应用程序在后退导航上一直滞后。对于网络调用，我使用的是 rxandroid/retrofit。我尝试使用单一和可观察来修复它。两者都使应用程序以相同的方式滞后。这是我使用 observable 时的代码。将数据加载到回收站视图时会发生滞后。所以我也添加了适配器类。

@Override
    public void onResume() 
        super.onResume();
        getMenuByShopAndCategoryId(categoryRequest.getId(), Utility.getShop(getActivity()));
    

    private void getMenuByShopAndCategoryId(int categoryId, int shopId)
        Repository.getInstance()
                .getMenuByShopAndCategoryId(categoryId,shopId)
                .subscribeOn(Schedulers.io())
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Observer<Response<MenuResponse>>() 
                    @Override
                    public void onSubscribe(Disposable d) 
                        disposable.add(d);
                    

                    @Override
                    public void onNext(Response<MenuResponse> menuResponse) 
                            //other calculations
                        
                    

                    @Override
                    public void onError(Throwable e) 
                        //error handling
                    

                    @Override
                    public void onComplete() 

                    
                );
    

    @Override
    public void onDestroy() 
        disposable.dispose();
        super.onDestroy();
    

public Observable<Response<MenuResponse>> getMenuByShopAndCategoryId(@NonNull  int category_id, @NonNull  int shop_id) 
        return apiService.getMenuByShopAndCategoryId(category_id,shop_id);
    

public class MenuItemsAdapter extends RecyclerView.Adapter<MenuItemsAdapter.ViewHolder> 
    private Context context;
    private ArrayList<MenuResponse.MenuRequest> menuItemArrayList;

    private ListRowMenuItemsBinding binding;
    private MenuItemsAdapterHandler menuItemsAdapterHandler;

    public MenuItemsAdapter(Context context, ArrayList<MenuResponse.MenuRequest> menuItemArrayList) 
        this.context = context;
        this.menuItemArrayList = menuItemArrayList;
    

    @NonNull
    @Override
    public MenuItemsAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) 
        binding = DataBindingUtil.inflate(LayoutInflater.from(context), R.layout.list_row_menu_items, viewGroup, false);
        menuItemsAdapterHandler = new MenuItemsAdapterHandler(context);
        binding.setHandler(menuItemsAdapterHandler);

        configureLabels();

        return new ViewHolder(binding);
    

    @Override
    public void onBindViewHolder(@NonNull MenuItemsAdapter.ViewHolder viewHolder, int i) 
        viewHolder.binding.lblItemName.setText(menuItemArrayList.get(i).getMenuName());
        viewHolder.binding.lblPrice.setText("MVR " + String.format("%.2f", Double.valueOf(menuItemArrayList.get(i).getSubTotal())));
        if (menuItemArrayList.get(i).getAvailability().equals(Constants.AVAILABLE))
            binding.lblAvailability.set(context, HuqTypogrphyStyle.CAPS_BUTTON_GREEN);
            viewHolder.binding.lblAvailability.setText("AVAILABLE");
         else 
            binding.lblAvailability.set(context, HuqTypogrphyStyle.CAPS_BUTTON_RED);
            viewHolder.binding.lblAvailability.setText("NOT AVAILABLE");
        
        viewHolder.binding.setMenuItem(menuItemArrayList.get(i));
        viewHolder.binding.executePendingBindings();
    

    @Override
    public int getItemCount() 
        return menuItemArrayList.size();
    

    @Override
    public int getItemViewType(int position) 
        return position;
    

    public class ViewHolder extends RecyclerView.ViewHolder 
        ListRowMenuItemsBinding binding;

        public ViewHolder(@NonNull ListRowMenuItemsBinding listRowMenuItemsBinding) 
            super(listRowMenuItemsBinding.getRoot());

            this.binding = listRowMenuItemsBinding;
        
    

    private void configureLabels() 
        binding.lblItemName.set(context, HuqTypogrphyStyle.H2_HEADING);
        binding.lblPrice.set(context, HuqTypogrphyStyle.BODY_GRAY);
        binding.lblAvailability.set(context, HuqTypogrphyStyle.BODY_GRAY);
    

【参考方案1】：

尝试将 api 调用从 on Resume 移至 onCreate。

【讨论】：

试过了！没用。我删除了我的片段过渡并减少了一点滞后。但我认为这不是解决方案