如何在utils/helper类中使用AsyncTasks

Question

嗨，我最近才开始使用room数据库，我正在看的课程建议使用一个utils/helper类来完成所有的数据库操作，但我从来没有被教过如何将所有的utils静态方法转换为异步任务，以便在room数据库中正确使用，所以我想知道是否有人对如何实现这一点有建议。干杯

（下面是我正在使用的实用程序和mainFragment

Utils类

}

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package maddo.com.aquariumfish.MainFragment;

import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import com.google.android.material.bottomnavigation.BottomNavigationView;

import java.util.ArrayList;

import maddo.com.aquariumfish.Adaptors.FishAdaptor;
import maddo.com.aquariumfish.Daos.FishDao;
import maddo.com.aquariumfish.DataBases.FishDataBase;
import maddo.com.aquariumfish.FavouriteFishActivity;
import maddo.com.aquariumfish.Models.Fish;
import maddo.com.aquariumfish.R;
import maddo.com.aquariumfish.SearchActivity;
import maddo.com.aquariumfish.Utils;

public class MainFragment extends Fragment {

    private RecyclerView MainRecView;

    private FishAdaptor fishAdaptor;




    private BottomNavigationView bottomNavigationView;

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

        initView(view);
        initBottomNavView();
        initRecView();

        return view;
    }



    @Override
    public void onResume() {
        super.onResume();
        initRecView();
    }

    private void initRecView(){
        fishAdaptor = new FishAdaptor(getActivity());
        MainRecView.setAdapter(fishAdaptor);
        MainRecView.setLayoutManager(new GridLayoutManager(getActivity(), 2));
        ArrayList<Fish> fish = Utils.getAllFish(getActivity());
        if(null!= fish){
            fishAdaptor.setFish(fish);
        }



    }

    private void initBottomNavView() {

        bottomNavigationView.setSelectedItemId(R.id.bottomHome);

        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId()){
                    case R.id.bottomHome:
                        break;
                    case R.id.bottomFavFish:
                        Intent FavIntent = new Intent(getActivity(), FavouriteFishActivity.class);
                        FavIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(FavIntent);
                        break;
                    case R.id.search:
                        Intent SearchIntent = new Intent(getActivity(), SearchActivity.class);
                        SearchIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(SearchIntent);
                        break;
                    default:
                        break;
                }
                return false;
            }
        });


    }
    private void initView(View view) {
        MainRecView = view.findViewById(R.id.mainRecView);
         bottomNavigationView =view.findViewById(R.id.MainbottomNavView);

    }

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Answer 1

不使用AsyncTask，我将建议使用coroutines。它非常简单，而且比AsyncTask效率最高。

Answer 2

也许您不想将每个方法转换为AsyncTask，如果这是您要说的。AsyncTask是一个并发框架，它允许您在Utils类自己的专用线程上调用它。

如果我们想让事情变得尽可能简单，只需创建一个AsyncTask类并调用您的Utils方法。您的Utils方法将使用AsyncTask提供的上下文。