如何确保在发布更新时不会删除我的应用程序数据？

My android app saves an array of Objects to cache using serializable, but when updates are released, the array is completely deleted and users have to re-do all input. What is the solution to this? Thanks in advance

我的Android应用程序使用serializable保存一个对象数组进行缓存,但是当发布更新时,数组被完全删除,用户必须重新进行所有输入。这是什么解决方案?提前致谢

2 个解决方案

#1

How did you store you serializable object to the cache? The package management system will keep the old data for an update installation of the app.

你是如何将可序列化对象存储到缓存的?包管理系统将保留旧数据以进行应用程序的更新安装。

    ObjectOutputStream objectOutputStream = null;
    try {
        objectOutputStream = new ObjectOutputStream(new FileOutputStream(
                getCacheDir() + File.separator + "object"));
        MyObject object = new MyObject();
        object.setData(15);
        object.setName("name");
        objectOutputStream.writeObject(new MyObject());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } finally {
        if (objectOutputStream != null) {
            try {
                objectOutputStream.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }

#2

Look into ActiveAndroid if you are fine with storing data on the device. Look into building out a restful API in the cloud if you want it to persist forever.

如果您可以在设备上存储数据,请查看ActiveAndroid。如果您希望它永远存在,请考虑在云中构建一个宁静的API。