google-maps - Android中Google Maps标记周围的脉冲环动画

我想在Android Google mapFragment中的蓝点当前用户位置上添加脉冲环动画（如Uber）。

有人可以帮我这个忙吗？

最佳答案

我找到了一种将脉动动画添加到标记的解决方案。
这是地图部分，此处的变量“ map”表示您的地图。

private Circle lastUserCircle;
private long pulseDuration = 1000;
private ValueAnimator lastPulseAnimator;

private void addPulsatingEffect(LatLng userLatlng){
           if(lastPulseAnimator != null){
                lastPulseAnimator.cancel();
                Log.d("onLocationUpdated: ","cancelled" );
            }
            if(lastUserCircle != null)
                lastUserCircle.setCenter(userLatlng);
            lastPulseAnimator = valueAnimate(userLocation.getAccuracy(), pulseDuration, new ValueAnimator.AnimatorUpdateListener() {
                @Override
                public void onAnimationUpdate(ValueAnimator animation) {
                    if(lastUserCircle != null)
                        lastUserCircle.setRadius((Float) animation.getAnimatedValue());
                    else {
                        lastUserCircle = map.addCircle(new CircleOptions()
                                .center(userLatlng)
                                .radius((Float) animation.getAnimatedValue())
                                .strokeColor(Color.RED)
                                .fillColor(Color.BLUE));
                    }
                }
            });

}
protected ValueAnimator valueAnimate(float accuracy,long duration, ValueAnimator.AnimatorUpdateListener updateListener){
        Log.d( "valueAnimate: ", "called");
        ValueAnimator va = ValueAnimator.ofFloat(0,accuracy);
        va.setDuration(duration);
        va.addUpdateListener(updateListener);
        va.setRepeatCount(ValueAnimator.INFINITE);
        va.setRepeatMode(ValueAnimator.RESTART);

        va.start();
        return va;
    }

您必须通过添加PositionChangedListener在位置更新上调用此方法。您可以在Google地图文档中轻松找到它。之后，对于每次更新，请调用上述方法。

将脉冲半径固定为相同的值，使其既不会太大也不会太小

写这个方法

protected float getDisplayPulseRadius(float radius) {
        float diff = (map.getMaxZoomLevel() - map.getCameraPosition().zoom);
        if (diff < 3)
            return radius;
        if (diff < 3.7)
            return radius * (diff / 2);
        if (diff < 4.5)
            return (radius * diff);
        if (diff < 5.5)
            return (radius * diff) * 1.5f;
        if (diff < 7)
            return (radius * diff) * 2f;
        if (diff < 7.8)
            return (radius * diff) * 3.5f;
        if (diff < 8.5)
            return (float) (radius * diff) * 5;
        if (diff < 10)
            return (radius * diff) * 10f;
        if (diff < 12)
            return (radius * diff) * 18f;
        if (diff < 13)
            return (radius * diff) * 28f;
        if (diff < 16)
            return (radius * diff) * 40f;
        if (diff < 18)
            return (radius * diff) * 60;
        return (radius * diff) * 80;
    }

并改变这条线

userLocation.getAccuracy()

至

getDisplayPulseRadius(userLocation.getAccuracy()

并且

.radius((Float) animation.getAnimatedValue())

至

.radius(getDisplayPulseRadius((Float) animation.getAnimatedValue()))

如果要使颜色变大时颜色逐渐变为透明的效果，可以在要设置动画器内部半径的下一行中使用

circle.setFillColor(adjustAlpha(pulseAroundMeFillColor, 1 - animation.getAnimatedFraction()));

private int adjustAlpha(int color, float factor) {
        int alpha = Math.round(Color.alpha(color) * factor);
        int red = Color.red(color);
        int green = Color.green(color);
        int blue = Color.blue(color);
        return Color.argb(alpha, red, green, blue);
    }