从 Android11 开始，我是否需要遵守 Android 的 SAF 才能在公共下载位置创建文件？

Question

I am on Android 11. I just want to be able to create a file in /storage/emulated/0/Download directory on my phone. So, this is the public Download folder that I need to create a file on.

I don't need access to read/modify/delete other files in /storage/emulated/0/Download . i just want my app to be able to create and replace a file of its own at /storage/emulated/0/Download .

Question:

• Do I need to go by the Storage Access Framework for this?
• Do I need any special permission for this?
• Or is it possible get access to /storage/emulated/0/Documents without going through the hassle of Android SAF?

My app is able to create a file at /storage/emulated/0/Download using Android 10 but it fails to do that since Android 11.

My use case is very simple. I just want to create a file at /storage/emulated/0/Download and keep appending more data to the file by replacing it with a new one from time to time.

Answer 1

Do I need to go by the Storage Access Framework for this?

No.

Do I need any special permission for this?

No, though you will need WRITE_EXTERNAL_STORAGE for older devices.

Or is it possible get access to /storage/emulated/0/Documents without going through the hassle of Android SAF?

Environment.getExternalStoragePublicDirectory() is being undeprecated , so it is safe to use that to access Environment.DIRECTORY_DOWNLOADS . That should give you the same access that you have with MediaStore :

• You can create files there

• You can read and write your own files ¹ there

• You have no access to other apps' files there

¹ For the purposes of this bullet, "your own" refers to your current app installation — if the user uninstalls and reinstalls your app, files from the old installation of your app are no longer considered to be "your own".