Friday, June 28, 2013

DevBytes: Animating Multiple Properties in Parallel

Suppose you want to animate multiple properties in parallel on some target object. How would you do it? ValueAnimator? Multiple ObjectAnimators?

This episode covers different ways of animating multiple properties, and specifically covers the use of the lesser-known PropertyValuesHolder class.



Friday, June 21, 2013

DevBytes: Animating ListView Deletion: Now on Gingerbread!

In this episode, I tried to anticipate the question I knew would come up on my previous show about animating ListView deletion: "But how would I do this on Gingerbread?"

Here's how.



Friday, June 14, 2013

DevBytes: Animating ListView Deletion

It's Friday: must be time for another DevBytes episode.

Finally, here is the DevBytes episode around the ListView animation demo in the talk A Moving Experience that I gave with Romain Guy at Google I/O last month.

The code is nearly the same as that in the I/O talk, except I tweaked it to make it more general-purpose. Specifically, it no longer depends on the setHasTransientState() method (introduced in Jellybean 4.1) to keep the views around while fiddling with layout. Instead, it uses an adapter with stable itemIds, and uses those Ids to track where the content is before and after layout.

As written, the code is still dependent on Android 4.1, but that's only because of the use of ViewPropertyAnimator.withEndAction() method, which is really just syntactic sugar around adding a listener and running the end-action code in the onAnimationEnd() callback. So you could totally port this code all the way back to Android 3.1 (when ViewPropertyAnimator was introduced) or even 3.0 (if you use ObjectAnimator instead).

Watch the video. Check out the code. Play with ListView. Animate. Enjoy.

A Moving Experience:

DevBytes on YouTube:


Friday, June 7, 2013

DevBytes: Custom Activity Animations

It's Friday: time for another DevBytes.

It's been a while, but they're back. At least until the queue runs out again and I write another glut of demos to talk about.

This episode, and most of the upcoming ones (teaser alert!) are around demos/code that we showed in A Moving Experience, the animation talk that +Romain Guy and I gave at Google I/O 2013.

Custom Activity Animations:
Window animations provide an easy way to animate transitions between activities. The animations can be customized to some extent, but there's only so much interaction between the launching and launched activities that you can take advantage of with the standard window animations.
This episode covers a different technique for fully customizable animations.