允许写入 SD 卡 [英] Permission to write to the SD card

问题描述

我希望我的应用程序将应用程序数据库存档到 SD 卡.在我的代码中，我检查目录 canWrite() 是否存在，如果不存在，则抛出一个 IOException.在这个特定的例子中，我试图将 db 文件复制到 SD 卡上的根目录，但它抛出了 IOException.如何更改文件夹/文件的权限以使其能够写入?

I would like my app to archive the application DB to the SD card. In my code I check if the directory canWrite() exists, and if not, throw an IOException. In this particular instance, I am trying to copy the db file to the root directory on the SD card, but it's throwing an IOException. How can I change the permission on a folder/file to be able to write to it?

推荐答案

SD 卡目录是 /sdcard 是对的，但您不应该对其进行硬编码.相反，调用Environment.getExternalStorageDirectory() 获取目录:

You're right that the SD Card directory is /sdcard but you shouldn't be hard coding it. Instead, make a call to Environment.getExternalStorageDirectory() to get the directory:

File sdDir = Environment.getExternalStorageDirectory();

如果您还没有这样做，您需要通过在清单中添加以下行来授予您的应用正确的写入 SD 卡的权限:

If you haven't done so already, you will need to give your app the correct permission to write to the SD Card by adding the line below to your Manifest:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

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