I recently moved my gf from iOS to Android and searched all over the internet to see how I can move the WhatsApp database from iOS to whatsapp on Android!! You'd think whatsapp would let you do that! Long story short , there might be a way of doing that if you install an older version of it. I failed to transfer the data. But you can back it up as plain text using "share conversation" feature and then uploading or emailing it.