Welcome to the forums. I am not sure if the data from a Blackberry can be read by Android. Have you asked the developer of whatsapp if this is possible?
"If you are moving from one type of phone to another, such as from an iPhone to an Android,*and*preserving your number, you will keep your account info, such as subscription information and group participation. This information is tied to the phone number. Simply download WhatsApp on the new phone and verify your number.
Note: You cannot migrate your messages across different types of phone".