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Use springs for RecyclerView.ItemAnimator #751

merged 4 commits into from Jul 11, 2019


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commented Jul 10, 2019

馃摙 Type of change

  • Bugfix
  • New feature
  • Enhancement
  • Refactoring

馃摐 Description

This change updates SlideInItemAnimator which is the base class of all custom RecyclerView.ItemAnimators, to use SpringAnimations when animating adding or moving items.

馃挕 Motivation and Context

This change supports smoother, re-targetable animations. Now if an item moves to a new position while a move is already happening, it respects the velocity of the running animation, smoothly re-targeting to the new end position.

馃挌 How did you test it?


馃摑 Checklist

  • I ran ./gradlew spotlessApply before submitting the PR
  • I reviewed submitted code
  • I added tests to verify changes
  • All tests passing

馃敭 Next steps


馃摳 Screenshots / GIFs

nickbutcher added 3 commits Jul 10, 2019
if (springAnim == null) {
springAnim = SpringAnimation(this, property).apply {
spring = SpringForce().apply {
this.dampingRatio = damping

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keyboardsurfer Jul 10, 2019


this can be confusing here. Consider naming the parameters.

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nickbutcher Jul 11, 2019

Author Collaborator

Actually, should probably always configure the spring damping/stiffness, even if reusing an existing SpringAnimator. Will update.

@nickbutcher nickbutcher merged commit fb951b6 into master Jul 11, 2019

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ci/circleci: build Your tests passed on CircleCI!
ci/circleci: test_instrumented Your tests passed on CircleCI!
cla/google All necessary CLAs are signed

@nickbutcher nickbutcher deleted the nb/spring-item-animator branch Jul 11, 2019

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