Yes mobile app development on Android does use Java and yes Wakfu is written in Java, but the graphics libraries are immensely different. Also, the game's UI would not translate entirely well and it wouldn't be profitable. The average player on a tablet or smartphone will spend less than 20 minutes on a phone game in one session. Games that thrive on mobile devices tend to be spaced out into short sessions, a dungeon in Wakfu takes at least twice that amount of time. So even if it was ported to tablets, so few people would play it that it would not justify the huge production time and cost. I should know, app development is my job.