Android Question SaveAs on existing file

Sub SaveAs (Source As InputStream, MimeType As String, Title As String) As ResumableSub
    Dim intent As Intent
    intent.Initialize("android.intent.action.CREATE_DOCUMENT", "")
    intent.AddCategory("android.intent.category.OPENABLE")
    intent.PutExtra("android.intent.extra.TITLE", Title)
    intent.SetType(MimeType)
    StartActivityForResult(intent)
    Wait For ion_Event (MethodName As String, Args() As Object)
    If -1 = Args(0) Then 'resultCode = RESULT_OK
        Dim result As Intent = Args(1)
        Dim jo As JavaObject = result
        Dim ctxt As JavaObject
        Dim ContentResolver As JavaObject = ctxt.InitializeContext.RunMethodJO("getContentResolver", Null)
        Dim out As OutputStream = ContentResolver.RunMethod("openOutputStream", Array(jo.RunMethod("getData", Null), "wt")) 'wt = Write+Trim
        Log("Result:"&result.GetData)
        Log("Out:"&out)
        File.Copy2(Source, out)
        out.Close
        Return True
    End If
    Return False
End Sub

Problem:
Storage Access Framework ACTION_CREATE_DOCUMENT has no option to overwrite an existing file.
A file such as "filename.ext (1)" will be created if "filename.ext" already exists in folder.

To minimize required work and to reuse existing code, the following method can be used:
1. Allow putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true) for ACTION_CREATE_DOCUMENT intent;
2. No change to picker UI (only a single filename as input in startActivityForResult);
3. If desired filename does not exist, onActivityResult returns Uri with getData();
4. If filename already exists, onActivityResult returns Uri with getClipData();
5. In the latter case, getClipData() has two items (new Uri and existing Uri).

Benefit:
1. Proposed method can reuse code for ACTION_OPEN_DOCUMENT (EXTRA_ALLOW_MULTIPLE tag);
2. Developer can offer (via dialog) to overwrite an existing file or create a new one;
3. ACTION_CREATE_DOCUMENT intent works the old way (without EXTRA_ALLOW_MULTIPLE tag).