有没有一种方法可以将SharedPreferences存储到SDcard? [英] Is There A Way To Store SharedPreferences to SDcard?

问题描述

我编写了一个具有几个硬编码设置的应用程序，例如fontSize或targetDirectory.我希望能够不经常更改这些类型的设置.

I've written an app that has several hard-coded settings such as fontSize or targetDirectory. I would like to be able to change those type of settings on an infrequent basis.

SharedPreferences似乎是解决此问题的一种方法，但我想共享此应用程序和设置，而且我的手机没有植根.

SharedPreferences seems to be one way to go about it but I want to share this application and settings, and my phone is not rooted.

我的应用程序是个人工具，没有UI.它打开，完成工作，然后关闭.我可以创建一个等效于Windows .ini文件的文件并对其进行读/写操作，但这似乎很笨拙.将SharePreferences文件放在我可以访问的sdcard上，而不是我无法访问的设备内存上，似乎可以正常工作.

My application is a personal tool, and does not have a UI. It opens, does it's job, and then closes. I could create the equivalent of a Windows .ini file and read/write to it, but that seems clunky. Having the SharePreferences file located on the sdcard where I can reach it, instead of device memory, where I can't, seems like that would work.

我不想备份这些首选项，只是希望能够对其进行编辑，或者将其复制到新设备上.

I do not want to backup these preferences, just be able to edit them, or copy them to a new device.

推荐答案

默认情况下，SharedPreferences文件存储在内部存储器中.您可以通过编程将其备份到SD卡.

By default SharedPreferences files are stored in internal storage. You can make a backup of it to SD card programmatically.

    File ff = new File("/data/data/"
             + MainActivity.this.getPackageName()
             + "/shared_prefs/pref file name.xml");

    copyFile(ff.getPath().toString(), "your sdcard path/save file name.xml");



private void copyFile(String filepath, String storefilepath) {
    try {
        File f1 = new File(filepath);
        File f2 = new File(storefilepath);
        InputStream in = new FileInputStream(f1);

        OutputStream out = new FileOutputStream(f2);

        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
        System.out.println("File copied.");
    } catch (FileNotFoundException ex) {
        System.out.println(ex.getMessage());
    } catch (IOException e) {
        System.out.println(e.getMessage());
    }
}

您可以在初次启动时将其替换回来，并在应用程序关闭时将其备份.

You may replace it back when first start and backup it when application closed.

参考文献:此处

这篇关于有没有一种方法可以将SharedPreferences存储到SDcard?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！