Question

注意：：我正在使用AndroidTV应用程序，因此我正在使用焦点导航和远程控制。

我有一个item的recyclerView，我在每个项目的onFocusChange中做一些动画处理。因此，当您使用箭头按钮浏览列表时，它将使用动画突出显示每个项目：

 override fun onFocusChange(v: View?, focused: Boolean) {

    val card = rowItemView.card
    val title = rowItemView.title

    val smallAnimation = rowItemView.viewModel.useSmallScaleAnimation


    card.pivotX = when  {
        smallAnimation && position != 0->  card.width.toFloat() / 2.0f
        else -> 0f
    }

    card.pivotY = card.height.toFloat() / 2.0f

    if (focused) {
        rowItemView.viewModel.setIsFocused(focused)
        card.doTheAnimation(
            titleView = title,
            scale = if (smallAnimation) 1.5f else 1.2f,
            elevation = 8.0f,
            destinationAlpha = 1.0f
        )
        card.cardElevation = rowItemView.context.resources.getDimensionPixelSize(R.dimen.small_card_elevation).toFloat()
    }
    else {
        card.doTheAnimation(
            titleView = title,
            scale = 1.0f,
            elevation = 0.0f,
            destinationAlpha = 0.0f,
            onAnimationEnd = { rowItemView.viewModel.setIsFocused(focused) }
        )
        card.cardElevation = 0f
    }
}

private fun View.doTheAnimation(
    titleView: View?,
    scale: Float,
    elevation: Float,
    destinationAlpha: Float,
    onAnimationEnd: () -> Unit = {}
) {
    val bannerX = ObjectAnimator.ofFloat(this, View.SCALE_X, scale)
    val bannerY = ObjectAnimator.ofFloat(this, View.SCALE_Y, scale)
    val bannerZ = ObjectAnimator.ofFloat(this, View.TRANSLATION_Z, elevation)

    val animSet = AnimatorSet()
    if (titleView != null) {
        val titleAlpha = ObjectAnimator.ofFloat<View>(
            titleView,
            View.ALPHA,
            destinationAlpha
        )
        animSet.playTogether(bannerX, bannerY, bannerZ, titleAlpha)
    } else {
        animSet.playTogether(bannerX, bannerY, bannerZ)
    }
    animSet.duration = 150L
    animSet.addListener(object : AnimatorListenerAdapter() {
        override fun onAnimationStart(animation: Animator) {
            titleView?.visibility = View.VISIBLE
        }

        override fun onAnimationEnd(animation: Animator) {
            if (titleView?.alpha == 0.0f) {
                titleView.visibility = View.GONE
            } else {
                titleView?.visibility = View.VISIBLE
            }
            onAnimationEnd.invoke()
        }
    })

    // `Handler().post` is attempt to speed up animation a little -> might be removed in future if nop benefit can be experienced
    Handler().post{
        animSet.start()
    }
}

但是您也可以按住遥控器上的箭头按钮，然后快速滚动列表。问题在于，在这种情况下，动画会尝试从快速滚动开始的每个项目开始播放，而且效果不好。它看起来像马车和破损。

是否有可能仅对真正聚焦的物品启动动画？因此，当您按下箭头时，它会针对每个项目启动，但是当您按住箭头时，它仅对您停止的项目启动？

长按滚动时延迟onFocusChanged事件

0 个答案: