在 Q 中,如果您想要访问不是普通音乐或媒体文件的文件,即在您的情况下sdcard/test
,您需要执行以下操作:
为了访问其他应用程序创建的任何其他文件,包括“下载”目录中的文件,您的应用程序必须使用存储访问框架,它允许用户选择特定文件。
引用源:http: //developer.android.com/preview/privacy/scoped-storage
// Here are some examples of how you might call this method.
// The first parameter is the MIME type, and the second parameter is the name
// of the file you are creating:
//
// createFile("text/plain", "foobar.txt");
// createFile("image/png", "mypicture.png");
// Unique request code.
private const val WRITE_REQUEST_CODE: Int = 43
...
private fun createFile(mimeType: String, fileName: String) {
val intent = Intent(Intent.ACTION_CREATE_DOCUMENT).apply {
// Filter to only show results that can be "opened", such as
// a file (as opposed to a list of contacts or timezones).
addCategory(Intent.CATEGORY_OPENABLE)
// Create a file with the requested MIME type.
type = mimeType
putExtra(Intent.EXTRA_TITLE, fileName)
}
startActivityForResult(intent, WRITE_REQUEST_CODE)
}
示例源https://developer.android.com/guide/topics/providers/document-provider