java - 如何将java Json数据获取类变成方法？

Question

我有一个从 Web 服务获取数据的方法，所以我正在寻找一种将其作为方法调用的方法。我怎样才能把这段代码变成一个方法呢？或者我可以在方法中调用一个类吗？因为它有一个 protected 方法并从一个类扩展，但是如果我将扩展类 AsyncTask 实现到该类，我需要使用 Json 获取 protected 方法 doInBackground 它说“接口(interface)在此详细说明”。这是我的代码，我需要将其转换为方法或将其添加到我想要使用它的类中的方法:

Notice: I already extended AppCompatActivity to the class I want to call doInBackground in so I cannot extend FetchData class.

非常感谢:D

package com.example.wordspuzzlejsontest;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;





public class FetchData extends AsyncTask<Void, Void, Void> {

    final String update = "4";
    String data = "";
    int currentLevel;

    Context context;

    FetchData(Context context) {
        this.context = context;
    }

    @Override
    protected Void doInBackground(Void... voids) {
        try {
            URL url = new URL("https://api.jsonbin.io/b/5e42776dd18e4016617690ce/" + update);

            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            InputStream inputStream = httpURLConnection.getInputStream();
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            String line = "";
            while (line != null) {
                line = bufferedReader.readLine();
                data = data + line;
            }

            JSONArray JA = new JSONArray(data);

            SharedPreferences sharedPreferences = context.getSharedPreferences("SHARED_PREFS", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = sharedPreferences.edit();

            currentLevel = sharedPreferences.getInt("currentLevel", 0);

            for (int i = 0; i < JA.length();) {

                i = currentLevel;
                JSONObject JO = (JSONObject) JA.get(i);


                String id = (String) JO.get("id");
                String img = (String) JO.get("img");
                String w1 = (String) JO.get("w1");
                String w2 = (String) JO.get("w2");
                String w3 = (String) JO.get("w3");
                String w4 = (String) JO.get("w4");

                editor.putString("id" + i, id);
                editor.putString("img" + i, img);
                editor.putString("w1" + i, w1);
                editor.putString("w2" + i, w2);
                editor.putString("w3" + i, w3);
                editor.putString("w4" + i, w4);

                editor.apply();
            }

        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

}


```

Answer 1

总结我的评论:

创建一个名为NewClass.java的新类

class NewClass extends FetchData{
  public Void fetchData(Void... voids){ return this.doInBackground(voids);}
}

由于 doInBackground 在 protected 方法中，您将在 NewClass.java 内拥有私有(private)访问权限