我在下面的代码中使用ois.readObject（）的List赋值抛出了一个未检查的类型转换警告。添加@SupressWarnings（“unchecked”）会让Android Studio给予我一个错误，说“此处不允许使用注解”。
是不是我唯一的选择来重新构造整个类，以便在那一行上声明Listtweets？

package com.fredliu.hellotwitter;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.fredliu.hellotwitter.models.Tweet;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

public class TweetListActivity extends BaseListActivityWithMenu {
    private List<Tweet> tweets;
    private static final String cacheFile = "tweetCache.ser";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_tweet_list);
        try {
            FileInputStream fis = openFileInput(cacheFile);
            ObjectInputStream ois = new ObjectInputStream(fis);
            @SuppressWarnings(value="unchecked")
            tweets = (List<Tweet>) ois.readObject();

            ois.close();
            fis.close();
            Log.d("FREDFRED", "Tweets cache read from!");
        } catch (Exception e) {
            Log.e("FREDFRED", "Something horrible has happened when reading from the Tweets cache");
        }

        if (tweets == null || tweets.isEmpty()) {
            Toast.makeText(getApplicationContext(), "No stored Tweets found!", Toast.LENGTH_LONG).show();
            tweets = new ArrayList<>();
            for (int i = 1; i <= 20; i++) {
                Tweet t = new Tweet();
                t.setTitle("Title " + i);
                t.setBody("Body " + i);
                tweets.add(t);
            }
        }

        try {
            FileOutputStream fos = openFileOutput(cacheFile, MODE_PRIVATE);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(tweets);
            Log.d("FREDFRED", "Tweets successfully written to cache!");
        } catch (FileNotFoundException e) {
            Log.e("FREDFRED", "Tweet cache file not found" + e);
        } catch (IOException e) {
            Log.e("FREDFRED", "Object not found when writing Tweet to cache");
        }

        ArrayAdapter a = new TweetAdapter(this, tweets);
        setListAdapter(a);

    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        Intent i = new Intent(this, TweetDetailActivity.class);
        startActivity(i);
        Toast.makeText(getApplicationContext(), "Position " + position + ", ID " + id, Toast.LENGTH_LONG).show();
    }
}