Get size of Bitmap Android

Possible Duplicate:
Bitmap byte-size after decoding?

Is there anyway so I can get the size of this Bitmap?I've tried to use getByteCount() but I can't use it?

Bitmap bitmap = BitmapFactory.decodeByteArray(decryptedData , 0, decryptedData .length);    //decoding bytearrayoutputstream to bitmap

Any suggestions?