Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Android Animations and Transitions The Transitions Framework Create a Custom Transition

Posted by Tinashe Mutematsaka
Tinashe Mutematsaka
9,086 Points

Now reverse the transition in onDisappear()! :)

Please do help me , i am stuck here !

AlphaScale.java 
public class AlphaScale extends Visibility {
    @Override
    public Animator onAppear(ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues) {
      return createAlphaScaleAnimator (view, 0, 1, 0, 1 );


    }

    @Override
    public Animator onDisappear(ViewGroup sceneRoot, View view, TransitionValues startValues, TransitionValues endValues) {
        return null;
    }

    private Animator createAlphaScaleAnimator(View view, float fromScale, float toScale, float fromAlpha, float toAlpha) {
        AnimatorSet set = new AnimatorSet();
        ObjectAnimator x = ObjectAnimator.ofFloat(view, View.SCALE_X, fromScale, toScale);
        ObjectAnimator y = ObjectAnimator.ofFloat(view, View.SCALE_Y, fromScale, toScale);
        ObjectAnimator alpha = ObjectAnimator.ofFloat(view, View.ALPHA, fromAlpha, toAlpha);
        set.playTogether(x, y, alpha);
        return set;
    }
}

1 Answer

Brenda Catherine Mugadza
Brenda Catherine Mugadza
3,708 Points
Brenda Catherine Mugadza
Brenda Catherine Mugadza
3,708 Points

to reverse the transition replace the return null with;

return createAlphaScaleAnimator(view,1,0,1,0);