java – 在Google Map v2上绘制五个透明的外接圆

我最近开始使用谷歌地图v2,并发现很多事情已经改变.以前我使用的是Google Map v1,所以我使用的是MapView的概念.

我正在尝试创建五个透明的外接圆,中心作为我当前的位置.下面是代码,我用于谷歌地图v1绘制圆圈,它对我来说很好.现在我想在Google Map v2上绘制我在下面的代码中绘制的相同圆圈.我不能在这里使用MapView,因为我在这里使用GoogleMap对象.任何人都可以帮我这个在Google Map v2上绘制圆圈,中心是我当前的位置

@Override
public void onLocationChanged(Location location) {
        if (location != null) {
            GeoPoint point = new GeoPoint(
                    (int) (location.getLatitude() * 1E6),
                    (int) (location.getLongitude() * 1E6));

            // Create a LatLng object for the current location
            LatLng latLng = new LatLng(location.getLatitude(),  location.getLongitude());

            // Show the location on the Google Map
            googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));

            // Zoom in the Google Map
            googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));

        //   Below is the code for Google Map v1 to draw the circle on the map  

        //   if (mapOverlay == null) {
        //   mapOverlay = new MapOverlay(this, R.drawable.mark_blue);

        //   List<Overlay> listOfOverlays = mapView.getOverlays();
        //   listOfOverlays.add(mapOverlay);
        //   }

        //   mapOverlay.setPointToDraw(point);
        //   mapView.invalidate();
        }
}

一个简单的类,它扩展了Overlay并在Google Map v1上绘制圆圈

class MapOverlay extends Overlay {
    private GeoPoint pointToDraw;
    int[] imageNames = new int[6];

    // This is the cached Point on the screen that will get refilled on
    // every draw
    private Point mScreenPoints;

    // This is the cached decoded bitmap that will be drawn each time
    private Bitmap mBitmap;

    // Cached Paint
    private Paint mCirclePaint;

    public MapOverlay(ProximityLocationListener gpsLocationListener,
            int currentUser) {
        imageNames[0] = currentUser;
        imageNames[1] = R.drawable.tenm;
        imageNames[2] = R.drawable.twentym;
        imageNames[3] = R.drawable.thirtym;
        imageNames[4] = R.drawable.fourtym;
        imageNames[5] = R.drawable.fiftym;

        // This only needs to be made here, once. It never needs to change.
        mCirclePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        mCirclePaint.setColor(0x10000000);
        mCirclePaint.setStyle(Style.FILL_AND_STROKE);

        // We only need to load this image once and then just keep drawing
        // it when dirtyed.
        mBitmap = BitmapFactory.decodeResource(getResources(),
                imageNames[0]);

        // This Point object will be changed every call to toPixels(), but
        // the instance can be recycled
        mScreenPoints = new Point();
    }

    public void setPointToDraw(GeoPoint point) {
        pointToDraw = point;
    }

    public GeoPoint getPointToDraw() {
        return pointToDraw;
    }

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
            long when) {
        super.draw(canvas, mapView, shadow);
        mScreenPoints = mapView.getProjection().toPixels(pointToDraw,
                mScreenPoints);

        int totalCircle = 5;
        int radius = 40;
        int centerimagesize = 13;

        for (int i = 1; i <= totalCircle; i++) {
            canvas.drawCircle(mScreenPoints.x + 18, mScreenPoints.y + 36, i
                    * radius, mCirclePaint);
            canvas.drawBitmap(BitmapFactory.decodeResource(getResources(),
                    imageNames[i]), ((mScreenPoints.x) + (i * radius)),
                    (mScreenPoints.y), null);
        }

        canvas.drawBitmap(mBitmap,
                (mScreenPoints.x - (centerimagesize / 2)),
                (mScreenPoints.y - (centerimagesize / 2)), null);
        super.draw(canvas, mapView, shadow);

        return true;
    }
}

我只需要在Google Map v2上绘制我在上面代码中绘制的相同圆圈.有什么办法,我可以使用上面的代码与GoogleMap对象,以便我可以在谷歌地图v2上绘制圆圈？

谢谢您的帮助.

更新的代码： –

我需要在Google Maps v2上绘制五个圆圈,将当前位置作为圆心.意味着五个圆中的每一个具有相同的中心但具有不同的半径：第一个圆的半径为10米,第二个圆半径为20米,第三个圆半径为30米,第四个圆半径为40米,第五个圆半径为50米.我正在使用Google Maps v2.

我还需要在圆圈的中心显示一个标记.

我正在尝试这样的东西在谷歌地图v2上绘制圆圈,但它只绘制一个圆而不是五个圆环

CircleOptions circleOptions = new CircleOptions()
                  .center(latLng)   //set center
                  .radius(500)   //set radius in meters
                  .fillColor(Color.TRANSPARENT)  //default
                  .strokeColor(0x10000000)
                  .strokeWidth(5);

                  myCircle = googleMap.addCircle(circleOptions);

我需要像这样绘制圆周 –

任何人都可以帮我吗？我在Google Map v2中创建此圈子时遇到问题.任何帮助将不胜感激.

解决方法:

只需使用googleMap.addCircle(…)为地图添加一个圆圈

见documentation

更新：

我完全按照我说的去做,我做你想做的事没有问题

这里是代码,超级简单的超级基本….

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    View view = super.onCreateView(inflater, container, savedInstanceState);
    GoogleMap map = getMap();

    int radius = 500;

    for(int i=0; i<5; i++){
        map.addCircle(new CircleOptions().center(new LatLng(0,0)).radius(radius).fillColor(0x30000000).strokeWidth(3));
        radius += 500;
    }
    return view;
}

标签：google-maps-api-2,android,java
来源： https://codeday.me/bug/20191009/1875583.html