Link to the capx file
Click to download the capx file
This tutorial follows the same process on Miu3's Platform double jump
http://www.scirra.com/forum/platformer-double-jump_topic45730_post286132.html
(thank you for this great tutorial helped me in a tough spot when deciding how to double jump for my android game)
However this tutorial adds the touch feature as well as how to add an animation at a jump as well as on landed using two buttons one for jumping one for double jumping