To capture the filenames of the files being dropped on a form you can use the following code:
Private Sub Form_OLEDragDrop(Data As DataObject, Effect As Long, Button As Integer, Shift As Integer, X As Single, Y As Single)
Dim intFile As Integer
With Data
For intFile = 1 To .Files.Count
Print Data.Files.Item(intFile)
Next intFile
End With 'Data
End Sub
This will print the filenames of the files on the form. Just change the Print statement to your own code to install the apk
[EDIT]
I forgot to mention that you have to set the OLEDropMode of the form to 1 - Manual otherwise you can't drop anything on the form