Help us understand the problem. What is going on with this article?

AndroidでAnimatorSetをRepeatするときの注意点

More than 3 years have passed since last update.

ちょっとハマったのでメモ。

AnimatorSetをリピート

Androidで xmlのAnimatorを定義する際、<set> タグの属性でrepeatさせることができない。
なので通常は以下のように繰り返し再生する。

animator.addListener(object : Animator.AnimatorListener {
    override fun onAnimationRepeat(animation: Animator?) {
    }

    override fun onAnimationStart(animation: Animator?) {
    }

    override fun onAnimationCancel(animation: Animator?) {
    }

    override fun onAnimationEnd(animation: Animator?) {
        animation?.start()
    }
})
animator.start()

だがこのままだとアニメーションが終了することができない。
viewを置換したあともAnimationが残り続け、いずれはStackOverflowExceptionを起こす。

var canceled = false
animator.addListener(object : Animator.AnimatorListener {
    override fun onAnimationRepeat(animation: Animator?) {
    }

    override fun onAnimationStart(animation: Animator?) {
        canceled = false
    }

    override fun onAnimationCancel(animation: Animator?) {
        canceled = true
    }

    override fun onAnimationEnd(animation: Animator?) {
        if (!canceled) {
            animation?.start()
        }
    }
})
animator.start()

きちんとキャンセル時の対応を入れてあげればOK。

Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした