什么是对象存储在Android上最合适的方式？ [英] What is the most suitable way to store object in android?

问题描述

您好我的应用我需要存储单个对象几个领域。此时它被保存这样

Hello in my app I need to store single object with several fields. At this moment it is saved like this

@Override
    public Object onRetainNonConfigurationInstance() {
        return UILApplication.advert;
    }

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        Advert retainedAdvert = (Advert) getLastNonConfigurationInstance();
        if (retainedAdvert != null) {
            UILApplication.advert = retainedAdvert;
        }
}

在哪里UILApplication是单身保持广告。有时（通常当通话摄像头）广告对象erised为默认值。所以我想了解储蓄和kepp这个对象有效的方式。它是明智的，它存储在文件/连载它或单个记录create database或有更好的东西？

Where UILApplication is singleton to keep advert. Sometimes ( often when call camera) advert object is erised to default. So i want to know about save and efficient way to kepp this object. Is it wise to store it in file/ serialise it or create database for a single record or there is something better?

推荐答案

从我的计算器摘自：

@SuppressWarnings("unchecked")
private void loadState() {
    ObjectInputStream ois;
    try {
        ois = new ObjectInputStream(openFileInput(FILE_STATE));
        state = ((State) ois.readObject());
        ois.close();

        ois = new ObjectInputStream(openFileInput(FILE_HISTORY));
        historyListAdapter.setItems((List<String>) ois.readObject());
        ois.close();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
        state = new State();
    } catch (IOException e) {
        e.printStackTrace();
        state = new State();
    } catch (ClassNotFoundException e) {
        Toast t = Toast.makeText(this, "Error parsing saved state",
                Toast.LENGTH_SHORT);
        t.show();
        state = new State();
    }
    setState(state);
}

private void saveState() {
    ObjectOutputStream oos;
    try {
        oos = new ObjectOutputStream(openFileOutput(FILE_STATE,
                Context.MODE_PRIVATE));
        oos.writeObject(state);
        oos.close();

        oos = new ObjectOutputStream(openFileOutput(FILE_HISTORY,
                Context.MODE_PRIVATE));
        oos.writeObject(historyListAdapter.getItems());
        oos.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
}

@Override
protected void onPause() {
    saveState();
    super.onPause();
}

呼叫LoadState的（）中的onCreate（）。

Call loadState() in onCreate().

正常工作对我来说，我知道它不是建议使用Java序列化在Android中，但我没有遇到任何错误或错误任何责任。没有问题，性能无论是。

Worked fine for me, I know its not advised to use java serialization in android, but I didn't encounter any errors or bugs whatsoever. No issues with performance either.

您当然应该调整错误处理。

You should of course tweak error handling depending on your application.

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