是否可以以編程方式滾動到 appbarlayout 的子項？

Question

<CoordinatorLayout>
<AppBarLayout>
<CollapsingToolbarLayout>
<Toolbar/>
</CollapsingToolbarLayout>
<View1/>
<View2/>
<View3/>
</AppBarLayout>
<RecyclerView/>(app_bar_scrolling_behavior)
</CoordinatorLayout>

我想以編程方式滾動到 view3 對 recyclerview 中的某個項目執行某些操作。對此有任何解決方案嗎？

Answer 1

能夠使用以下代碼片段通過使用值動畫師來實現這一點。 `

recyclerview.scrollToPosition(0)
val params = appbar.layoutParams as CoordinatorLayout.LayoutParams
val behavior = params.behavior as AppBarLayout.Behavior?
if (behavior != null) {
  val valueAnimator: ValueAnimator = ValueAnimator.ofInt()
  valueAnimator.interpolator = DecelerateInterpolator()
  valueAnimator.addUpdateListener { animation ->
    behavior.topAndBottomOffset = (animation.animatedValue as Int)
    appBar.requestLayout()
  }
  valueAnimator.setIntValues(
    0, -appbar.totalScrollRange + view3.root.measuredHeight
  )
  valueAnimator.duration = 50
  valueAnimator.start()
}

`