[Android] Floor Runner

Hi,

I am currently working on a little android game called floor runner. The idea is your a stick man and you just have to keep away from objects trying to kill you. Very simple. Currently I have some base code in place and very bad graphics. I am looking for someone to create some minimlistic but good looking art, if they want. I will start to post screen shots when im making good progress. This is just the start of the post.

I have a question on how to add double jumping into the game, below is the code I use for jumping.

public void update(float delta) {
		if(jumping) {
			velocity.y = -100;
			jumping = false;
		}
		
		if(position.y > originalY){
			position.y = originalY;
			canJump = true;
		}else{
			canJump = false;
			velocity.add(gravity.cpy().scl(delta));
		}
		
		position.add(velocity.cpy().scl(delta));

		collisionBox.x = position.x + 3;
		collisionBox.y = position.y + 1;
	}

	public void onClick(){
		if(isAlive){
			if(!jumping && canJump == true){
				jumping = true;
				canJump = false;
			}
		}
	}