Android Animations

My Animation talk from Droidcon New York City 2014

Original keynote w/ animations: https://www.dropbox.com/s/qhim23pfk3smsse/Android%20Animations.zip?dl=0
Sample app for camera distance tip:
https://github.com/dallasgutauckis/AnimationStation

1. ANDROID ANIMATIONS with Purpose (mostly)
2. ABOUT ME • Dallas Gutauckis • Lead Android Engineer SeatGeek • Over 4 years of Android experience • Former co-organizer of GDG/Android Alliance Philly • Creator of mediocre parcelabler.com tool
3. ANIMATIONS • WHY • With some examples! • WHAT • HOW
4. WHY ANIMATE?
5. WHY ANIMATE? • Ease transitions • Create a more natural experience • Inform on features • Whimsy
6. EASE TRANSITIONS • Things don’t simply “change” in real life • Transition/move from A to B • Flip, slide, rotate, fall, etc
7. SEATGEEK View transitions
8. TUMBLR Compose
9. NATURAL EXPERIENCE • Mimics physical properties • Mass • Elevation • Velocity
10. GOOGLE+ Post list
11. PLAY STORE Read more
12. INFORM ON FUNCTION • Let the user know something is there • Great for gestures
13. TUMBLR Follow
14. PLAY MUSIC Current song
15. PLAY MUSIC Next song
16. WHIMSY Be delightful… …but don’t get in the way.
17. SEATGEEK Announced not-logged-in
18. SEATGEEK Performers not-logged-in
19. FACEBOOK Pull-to-Refresh Loading
20. HOW TO ANIMATE
21. DISNEY ANIMATION: THE ILLUSION OF LIFE Ollie Johnston and Frank Thomas
22. 12 BASIC PRINCIPLES OF ANIMATION
23. SQUASH & STRETCH • Most real life objects react to impact and with elasticity
24. ANTICIPATION • Often times, when things are getting ready to move, they make a movement in the opposite first • Baseball pitcher pulls arm back before going forward to throw the ball • Person crouches before jumping
25. SLOW IN & OUT • Movement doesn’t just start and stop immediately • Running doesn’t just HAPPEN • You speed up before getting to your running speed • You slow down over time before coming to a stop • (Unless like Chet said, you hit a brick wall – good one Chet.)
26. WHAT SHOULD WE ANIMATE?
27. EVERYTHING
28. EVERYTHING • Not really, but sorta… • Animate when… • Something changes • Follow a blog • Screen transitions • You want to hint at functionality • You want to show off (Whimsy) • Heart beating • Radar
29. WHAT CAN WE ANIMATE? • Basic animations include • Alpha • Scale (x and y) • Rotation (x, y, and z) • Position (x, y) • Complex animations can animate anything you can program…
30. HOW DO WE ANIMATE?
31. QUICK WINS Simple platform functionality
32. overridePendingTransition • overridePendingTransition(int enter, int exit) • Probably not something you’ll change often though
33. setCustomAnimations (…) • Custom Fragment transitions • setCustomAnimations(int enter, int exit) • setCustomAnimations(int enter, int exit, int popEnter, int popExit) 13 (3.2)
34. android:animateLayoutChanges="true" • Supports standard views and layouts • ListView • LinearLayout • RelativeLayout • Support for custom animations with LayoutTransition via setLayoutTransition(…) 11 (3.0)
35. android:enterFadeDuration="..."
 android:exitFadeDuration="..." • <selector /> drawables • Animates between selector states 11 (3.0)
36. MORE COMPLEX
37. ObjectAnimator Honeycomb (3.0+)
38. FEATURES • Duration • Value interpolator • Sets • Sequentially • Parallel (“Together”) • Listeners • Repetition • Animate any target (Object)
39. EXAMPLE: ALPHA OUT ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(myView, "alpha", 0); alphaAnim.setDuration(200); // Default is 300 alphaAnim.setInterpolator(new AccelerateDecelerateInterpolator()); alphaAnim.addListener(new Animator.AnimatorListener() { @Override public void onAnimationEnd(Animator animation) { myView.setVisibility(View.GONE); } @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }); alphaAnim.start(); 11 (3.0)
40. EXAMPLE: ALPHA & TRANSLATIONX ObjectAnimator alphaAnim = ObjectAnimator.ofFloat(myView, "alpha", 0); ... alphaAnim.start(); ! ObjectAnimator translationXAnim = ObjectAnimator.ofFloat(myView, "translationX", -100); ! AnimatorSet set = new AnimatorSet(); set.playTogether( alphaAnim, translationXAnim ); ! set.start(); 11 (3.0)
41. EXAMPLE: AnimatorSet AnimatorSet set = new AnimatorSet(); set.playTogether( ObjectAnimator.ofFloat(myView, "alpha", 0), ObjectAnimator.ofFloat(myView, "translationX", -100) ); ! set.setInterpolator(new AccelerateDecelerateInterpolator()); set.setDuration(250); // Default is 300 set.addListener(new Animator.AnimatorListener() { @Override public void onAnimationEnd(Animator animation) { myView.setVisibility(View.GONE); } @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }); set.start(); 11 (3.0)
42. EXAMPLE: HARDWARE ACCELERATION AnimatorSet set = new AnimatorSet(); set.playTogether( ObjectAnimator.ofFloat(myView, "alpha", 0), ObjectAnimator.ofFloat(myView, "translationX", -100) ); ! set.setInterpolator(new AccelerateDecelerateInterpolator()); set.setDuration(250); // Default is 300 set.addListener(new Animator.AnimatorListener() { @Override public void onAnimationEnd(Animator animation) { myView.setLayerType(View.LAYER_TYPE_NONE, null); myView.setVisibility(View.GONE); } @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }); ! myView.setLayerType(View.LAYER_TYPE_HARDWARE, null); ! set.start(); 16 (4.1)
43. EXAMPLE: ARBITRARY VALUE myPancakeView.setPancakeCount(1); ! ObjectAnimator animator = ObjectAnimator.ofInt(myPancakeView, ”pancakeCount", 20); ! animator.setDuration(250); // Default is 300 animator.addListener(new Animator.AnimatorListener() { @Override public void onAnimationEnd(Animator animation) { myPancakeView.addButter(); myPancakeView.addSyrup(); } @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }); ! animator.start();
44. ViewPropertyAnimator Honeycomb MR1 (3.1+)
45. FEATURES • Duration • Value interpolator • Listeners • Start delay • Fluent interface
46. EXAMPLE: ALPHA OUT myView.animate() .alpha(0) .setDuration(250) // Default is 300 .setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationEnd(Animator animation) { myView.setVisibility(View.GONE); } @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }) .start(); 12 (3.1)
47. EXAMPLE: ALPHA & TRANSLATIONX myView.animate() .alpha(0) .translationX(-100) .setDuration(250) // Default is 300 .setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationEnd(Animator animation) { myView.setVisibility(View.GONE); } @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }) .start(); 12 (3.1)
48. EXAMPLE: HARDWARE ACCELERATION myView.animate() .alpha(0) .translationX(-100) .withLayer() .setDuration(250) // Default is 300 .setInterpolator(new AccelerateDecelerateInterpolator()) .setListener(new Animator.AnimatorListener() { @Override public void onAnimationStart(Animator animation) {} @Override public void onAnimationEnd(Animator animation) { myView.setVisibility(View.GONE); } @Override public void onAnimationCancel(Animator animation) {} @Override public void onAnimationRepeat(Animator animation) {} }) .start(); 16 (4.1)
49. A LITTLE MORE ON INTERPOLATORS
50. INTERPOLATORS • Determine the output value based on input • Imagine animating from 0 to 1 over 100 frames • Normally just 0, 0.01, 0.02, 0.03, …, 1 • Now, something else…
51. LINEAR Output 0 0.25 0.5 0.75 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Output output = input
52. OVERSHOOT Output 0 0.3 0.6 0.9 1.2 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Output output = (input - 1) * (input - 1) * (([tension]2 + 1) * (input - 1) + [tension]2) + 1
53. ACCELERATE + DECELERATE Output 0 0.25 0.5 0.75 1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Output output = (cos((input + 1) * π) / 2) + 0.5
54. TIPS, TRICKS, AND GOTCHAS
55. X/Y ROTATION Bad
56. • View#setCameraDistance(float) for rotationX/ rotationY
57. X/Y ROTATION Good
58. RE-RUNNING ANIMATIONS ON SAME VIEW myListener = new SimpleAnimatorListener(){ @Override public void onAnimationEnd(Animator animation){ v.animate().scaleYBy(0.5f).start(); } }; ! v.animate().scaleY(2f).setListener(myListener).start(); .setListener(null)
59. VIEW CLIPPING What you want What you’ve got
60. VIEW CLIPPING • Parent view encapsulates child drawing • Can’t draw outside • Refactor your layout
61. AGAIN What you want What you’ve got
62. WHAT YOU’VE GOT <FrameLayout> <LinearLayout bg=y> <View bg=r /> <View bg=g /> </Linearlayout> </FrameLayout>
63. WHAT YOU WANT <RelativeLayout> <View bg=y/> <View bg=r/> <View br=g/> </RelativeLayout>
64. VIEWOVERLAY • Could also use ViewOverlay • View.getOverlay().addView(myView); • Remove from parent first! 18 (4.3)
65. VIEW COMPOSITING • VideoView extends SurfaceView • Behind the window • Can’t be efficiently moved, scaled, rotated • Can’t be rotated on X or Y axis at all
66. VIEW COMPOSITING
67. VIEW COMPOSITING What you want What you’ve got
68. VIEW COMPOSITING • Use a TextureView instead • Only for animations/movement use cases 14 (4.0)
69. BACKWARD COMPATIBILITY
70. ALL THE INCOMPATIBILITY • NineOldAndroids • Open source! • Hyper-compatible (all the way to 1.0) • So much win! • Doesn’t support animateLayoutChanges • Doesn’t support LayoutTransition • Doesn’t support selector animations • ViewCompat • [set]hasTransientState
71. HOMEWORK
72. TRANSITIONMANAGER • Manages animations between layouts • Compatibility library/libraries already in the works 18 (4.3)
73. MATERIAL & L • New hotness • Ripple • Reveal • Hero • Curved motion • View state changes L (?)
74. RESOURCES https://speakerdeck.com/dlew/i-can-animate-and-so-can-you I Can Animate and So Can You Daniel Lew http://en.wikipedia.org/wiki/12_basic_principles_of_animation 12 Basic Principles of Animation Wikipedia, the free encyclopedia https://www.youtube.com/watch?v=ihzZrS69i_s Google I/O 2013: A Moving Experience Chet Haase & Romain Guy
75. GO OUT AND ANIMATE
76. THANKS Purple shirts seem to be a theme @DallasGutauckis /+DallasGutauckis Praise be to Duarte