set animation listener persists for animate() if not set to null, why does this happen?












0














Animation called on button click:



confirmBtn.setOnClickListener {
finalWalkthroughViewModel.setConfirmation(true)
it.hide()
deliveredView.show()
validateForm()
}


My extension functions on View:



fun View.hide(visibility: Int = android.view.View.GONE) {
this.alpha = 1.0f
this.animate().alpha(0.0f).setDuration(ANIMATION_TIME)
.setListener(object : Animator.AnimatorListener {
override fun onAnimationRepeat(animation: Animator?) {
}

override fun onAnimationEnd(animation: Animator?) {
this@hide.visibility = visibility
}

override fun onAnimationCancel(animation: Animator?) {
}

override fun onAnimationStart(animation: Animator?) {
}
})
}
fun View.show() {
this.alpha = 0.0f
this.visibility = View.VISIBLE

this.animate().alpha(1.0f).setDuration(ANIMATION_TIME).setListener(null)
}


so if I remove the .setListener(null) from show(), the listener set previously in the hide function gets called. Why does this happen? Does the animation implementation in android involve a companion object or a singleton class?










share|improve this question





























    0














    Animation called on button click:



    confirmBtn.setOnClickListener {
    finalWalkthroughViewModel.setConfirmation(true)
    it.hide()
    deliveredView.show()
    validateForm()
    }


    My extension functions on View:



    fun View.hide(visibility: Int = android.view.View.GONE) {
    this.alpha = 1.0f
    this.animate().alpha(0.0f).setDuration(ANIMATION_TIME)
    .setListener(object : Animator.AnimatorListener {
    override fun onAnimationRepeat(animation: Animator?) {
    }

    override fun onAnimationEnd(animation: Animator?) {
    this@hide.visibility = visibility
    }

    override fun onAnimationCancel(animation: Animator?) {
    }

    override fun onAnimationStart(animation: Animator?) {
    }
    })
    }
    fun View.show() {
    this.alpha = 0.0f
    this.visibility = View.VISIBLE

    this.animate().alpha(1.0f).setDuration(ANIMATION_TIME).setListener(null)
    }


    so if I remove the .setListener(null) from show(), the listener set previously in the hide function gets called. Why does this happen? Does the animation implementation in android involve a companion object or a singleton class?










    share|improve this question



























      0












      0








      0


      3





      Animation called on button click:



      confirmBtn.setOnClickListener {
      finalWalkthroughViewModel.setConfirmation(true)
      it.hide()
      deliveredView.show()
      validateForm()
      }


      My extension functions on View:



      fun View.hide(visibility: Int = android.view.View.GONE) {
      this.alpha = 1.0f
      this.animate().alpha(0.0f).setDuration(ANIMATION_TIME)
      .setListener(object : Animator.AnimatorListener {
      override fun onAnimationRepeat(animation: Animator?) {
      }

      override fun onAnimationEnd(animation: Animator?) {
      this@hide.visibility = visibility
      }

      override fun onAnimationCancel(animation: Animator?) {
      }

      override fun onAnimationStart(animation: Animator?) {
      }
      })
      }
      fun View.show() {
      this.alpha = 0.0f
      this.visibility = View.VISIBLE

      this.animate().alpha(1.0f).setDuration(ANIMATION_TIME).setListener(null)
      }


      so if I remove the .setListener(null) from show(), the listener set previously in the hide function gets called. Why does this happen? Does the animation implementation in android involve a companion object or a singleton class?










      share|improve this question















      Animation called on button click:



      confirmBtn.setOnClickListener {
      finalWalkthroughViewModel.setConfirmation(true)
      it.hide()
      deliveredView.show()
      validateForm()
      }


      My extension functions on View:



      fun View.hide(visibility: Int = android.view.View.GONE) {
      this.alpha = 1.0f
      this.animate().alpha(0.0f).setDuration(ANIMATION_TIME)
      .setListener(object : Animator.AnimatorListener {
      override fun onAnimationRepeat(animation: Animator?) {
      }

      override fun onAnimationEnd(animation: Animator?) {
      this@hide.visibility = visibility
      }

      override fun onAnimationCancel(animation: Animator?) {
      }

      override fun onAnimationStart(animation: Animator?) {
      }
      })
      }
      fun View.show() {
      this.alpha = 0.0f
      this.visibility = View.VISIBLE

      this.animate().alpha(1.0f).setDuration(ANIMATION_TIME).setListener(null)
      }


      so if I remove the .setListener(null) from show(), the listener set previously in the hide function gets called. Why does this happen? Does the animation implementation in android involve a companion object or a singleton class?







      android kotlin android-animation






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited yesterday









      daedsidog

      1,3231724




      1,3231724










      asked yesterday









      Azam M

      63




      63





























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