java - Android:在 SharedPreferences 中存储 ArrayList？

Question

我需要在我的 SharedPreferences 中存储一个类型为“Comment”的 ArrayList。这是我的模型类:

public class Comment {

    public String getPID() {
        return PID;
    }
    public void setPID(String pID) {
        PID = pID;
    }
    public String PID;
    public String Comment;
    public String Commenter;
    public String Date;

    public String getComment() {
        return Comment;
    }
    public void setComment(String comment) {
        Comment = comment;
    }
    public String getCommenter() {
        return Commenter;
    }
    public void setCommenter(String commenter) {
        Commenter = commenter;
    }
    public String getDate() {
        return Date;
    }
    public void setDate(String date) {
        Date = date;
    }
}

因此我的 ArrayList 包含 2 个需要存储在 SharedPreferences 中的 Comments。我试过 HashSet 但它需要字符串值:

ArrayList<Comment_FB> fb = getFeedback(); //my Comments List

SharedPreferences pref = getApplicationContext().getSharedPreferences("CurrentProduct", 0);
Editor editor = pref.edit();
Set<String> set = new HashSet<String>();
set.addAll(fb);
editor.putStringSet("key", set);
editor.commit();

伙计们，我该如何完成这项工作？ :)

Answer 1

我认为您需要将其存储为文件。

public static boolean save(String key, Serializable obj) {
    try {
        FileOutputStream outStream = new FileOutputStream(instance.getCacheDir() + "/" + key);
        ObjectOutputStream objOutStream;
        objOutStream = new ObjectOutputStream(outStream);
        objOutStream.writeObject(obj);
    } catch (Exception e) {
        e.printStackTrace();
        return false;
    }

    return true;
}


public static Object getObject(String key) {
    Object obj = null;
    if (!new File(instance.getCacheDir() + "/" + key).exists())
        return obj;
    FileInputStream inputStream;
    try {
        inputStream = new FileInputStream(instance.getCacheDir() + "/" + key);
        ObjectInputStream objInputStream = new ObjectInputStream(inputStream);
        obj = objInputStream.readObject();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (ClassNotFoundException e) {
        e.printStackTrace();
    }
    return obj;
}

您的“评论”类应该实现Serializable。