Writing/modifying files in sd card's public storage in Android?

Question

如何获取存储在SD卡外部存储中的文件的列表（音乐，图片...），修改文件的内容并覆盖Android 5.0+中的旧文件。

Answer 1

What you want is not strictly possible.

The closest you are going to get is:

• Use ACTION_OPEN_DOCUMENT_TREE to get the user to choose a document tree. The user can choose whatever the user wants. It does not have to be removable storage — it could be external storage, Google Drive, etc.

• Given the Uri that you get back from the ACTION_OPEN_DOCUMENT_TREE activity, wrap it in a DocumentFile using fromTreeUri() .

• From there, use DocumentFile a bit like you would use File , using listFiles() and isDirectory() recursively to walk the document tree.

• For whatever content you want to modify, use getUri() on the DocumentFile to get the Uri for that piece of content, use openInputStream() on a ContentResolver to read in the content, and use openOutputStream() on a ContentResolver to write out your modified content.