如何平滑地缩放Google地图上的标记？

Question

我想在 Google 地图上缩放标记，我的代码可以工作，但在某些设备中标记会消失几次，有人知道如何平滑缩放吗？

我尝试使用 ValueAnimator 来设置标记的图标：

val choreographer = Choreographer.getInstance()
                val desiredFrameRate = 20
                val frameInterval = 1000L / desiredFrameRate
                var lastFrameTime = 0L

                val widthAnimator = ValueAnimator.ofFloat(anim.fromX, anim.toX)
                widthAnimator.duration = anim.duration
                widthAnimator.repeatMode = anim.repeatMode
                widthAnimator.repeatCount = anim.repeatCount

                val heightAnimator = ValueAnimator.ofFloat(anim.fromY, anim.toY)
                heightAnimator.duration = anim.duration
                heightAnimator.repeatMode = anim.repeatMode
                heightAnimator.repeatCount = anim.repeatCount

                val animatorUpdateListener = ValueAnimator.AnimatorUpdateListener {
                    val currentTime = System.currentTimeMillis()
                    if (currentTime - lastFrameTime < frameInterval) {
                        return@AnimatorUpdateListener
                    }
                    lastFrameTime = currentTime
                    choreographer.postFrameCallback { choreographerTime ->
                        val scaleX =
                            BigDecimal((widthAnimator.animatedValue as Float).toDouble()).setScale(
                                3,
                                RoundingMode.HALF_EVEN
                            ).toFloat()
                        val scaleY =
                            BigDecimal((heightAnimator.animatedValue as Float).toDouble()).setScale(
                                3,
                                RoundingMode.HALF_EVEN
                            ).toFloat()
                        marker.setIcon(
                            createScaledBitmapDescriptor(
                                viewToDrawable(target), scaleX, scaleY
                            )
                        )
                    }
                }
                heightAnimator.addUpdateListener(animatorUpdateListener)
                animations.apply {
                    add(widthAnimator)
                    add(heightAnimator)
                }

Answer 1

使用 ObjectAnimator 而不添加额外的时间检查 使用 AnimatorSet 获得更好的帧渲染 避免频繁更改图标 位图缓存