Android Google Maps平滑更改圆半径 [英] Android google maps change circle radius smoothly

问题描述

我有一张需要画圆的地图.问题是圆应该是可调整大小的(例如，我有一个seekbar，并且基于seekbar值，我应该看看我的圆大小(半径)如何变化).我知道如何绘制圆，但是我无法想象如何使圆动态调整大小.有可能吗?

I have a map where I need to draw circle. Problem is that circle should be resizable (for example I have an seekbar and based on seekbar values I should see how my circle size (radius) is changing). I know how to draw a circle but I can't imagine how to make circle dynamically resizable. Is it possible?

在此处编辑如何将圆添加到地图中

EDIT here how I add circle to my map

@Override
    public void onMapClick(LatLng latLng) {
        mMap.addCircle(new CircleOptions()
                .center(latLng)
                .radius(100)
                .strokeWidth(0)
                .fillColor(0x66aaaFFF));
    }

如您所见，每次单击地图时，我都会将半径设置为100.但是，半径应该改变，圆环应该根据搜寻杆的值平滑绘制

as you can see I set radius to 100 each time when i click on map. However radius should change and circle should be drawn smoothly based on seekbar values

推荐答案

您可以使用OnSeekBarChangeListener的onProgressChanged上的setRadius方法，使圆半径在大小上可动态调整:

You can make it dinamycally resizable changing the circle radius using the setRadius method on the onProgressChanged of the OnSeekBarChangeListener:

private Circle circle;

circle = mMap.addCircle(new CircleOptions()
    .center(new LatLng(52, 5))
    .fillColor(Color.RED)
    .radius(100));

AppCompatSeekBar progress = (AppCompatSeekBar) findViewById(R.id.progress);
progress.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
        circle.setRadius(progress);
    }

    @Override
    public void onStartTrackingTouch(final SeekBar seekBar) {
    }

    @Override
    public void onStopTrackingTouch(final SeekBar seekBar) {
    }
});

但是，有一个尚未解决的已知Google Maps相关错误(问题5707:错误:圆形填充闪烁在快速的圆弧半径和中心更新处发生)，导致填充闪烁.

However there is a related unresolved known Google Maps bug (Issue 5707: Bug: Circle filling flickers on fast circle radius and center update) causing filling flickering.

更新:

问题5707已于2016年10月24日解决

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