如何在安卓系统中将json无库转换为.CSV文件？

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class JsonToCsvConverter {

    public static void convertJsonToCsv(String json, String csvFilePath) {
        try {
            JSONArray jsonArray = new JSONArray(json);

            File csvFile = new File(csvFilePath);
            FileWriter writer = new FileWriter(csvFile);

            // 写入CSV文件头部
            JSONObject firstObject = jsonArray.getJSONObject(0);
            JSONArray keys = firstObject.names();
            for (int i = 0; i < keys.length(); i++) {
                writer.append(keys.getString(i));
                if (i != keys.length() - 1) {
                    writer.append(",");
                }
            }
            writer.append("\n");

            // 遍历JSON数据并写入CSV文件
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                for (int j = 0; j < keys.length(); j++) {
                    writer.append(jsonObject.getString(keys.getString(j)));
                    if (j != keys.length() - 1) {
                        writer.append(",");
                    }
                }
                writer.append("\n");
            }

            writer.flush();
            writer.close();
        } catch (JSONException | IOException e) {
            e.printStackTrace();
        }
    }
}