How do I open a child document of a granted URI using ACTION_VIEW?

Question

Context:

Simple file explorer which shows a folder contents and allow user open any file with another app depending of the mime type

The expected behavior:

• Click in a button that launch OPEN_DOCUMENT_TREE activity
• User select a folder A
• Display all folder A contents in a list view
• When user click in a list item, launch ACTION_VIEW to open the file document inside another app that support rendering the contents

What I got actually:

• In the last step, the SecurityException is being thrown

---

The generation of my intent looks like:

fun someOfGrantedUris(): Uri {
  // These Uris were returned by `ACTION_OPEN_DOCUMENT_TREE` activity
  val grantedUris = contentResolver.persistedUriPermissions
  
  return grantedUris[0] // Consider this a Uri always not null and valid
}

val parentDocument = DocumentFile.fromTreeUri(someOfGrantedUris())

val childDocument = parentDocument.listFiles()[0] // First child document

val uri = childDocument.uri

val intent =
  Intent(Intent.ACTION_VIEW).apply {
    addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP)
    addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
    addCategory(Intent.CATEGORY_DEFAULT)

    // This is the same of just `uriWithProviderScheme = uri`
    // but in this way I can change any part of the Uri to test and debug
    val uriWithProviderScheme = Uri.Builder().let {
      it.scheme(uri.scheme)
      it.path(uri.path)
      it.query(uri.query)
      it.authority(uri.authority)
      it.build()
    }

  setDataAndType(uriWithProviderScheme, type)
}

But when I try to start this activity:

try {
  // This is not native Android but a Flutter plugin
  plugin.binding?.activity?.startActivity(intent, null)
} catch (e: SecurityException) {
  // I always fall here
}

• I have all runtime permissions already granted: READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE

• I can also delete the child document by using childDocument.delete() it works fine, but when I try to launch it on ACTION_VIEW a SecurityException is thrown, why?

class java.lang.SecurityException: UID 10498 does not have permission to content://com.android.externalstorage.documents/tree/primary%3ADownload/offline/document/primary%3ADownload/offline/Sample%20File.txt [user 0]; you could obtain access using ACTION_OPEN_DOCUMENT or related APIs

Even though we can try to use ACTION_OPEN_DOCUMENT this is not what I'm looking for since I already requested permissions before with ACTION_OPEN_DOCUMENT_TREE and by the docs:

Grant access to a directory's contents: The ACTION_OPEN_DOCUMENT_TREE intent action, available on Android 5.0 (API level 21) and higher, allows users to select a specific directory, granting your app access to all of the files and sub-directories within that directory.