android 谷歌地图覆盖 ontap

Question

我创建了 3 个类。它们中的每一个都扩展了 Overlay。他们每个人都有“复杂”的覆盖绘制方法。这就是为什么我选择覆盖 Overlay 而不是使用 ItemizedOverlay。现在，为了确定已点击了哪个叠加层，使用 ItemizedOverlay 会更容易，但我仍然使用“普通”叠加层。如何正确确定我的哪些叠加层已被点击。

我已经在每个（三个）扩展 Overlay 的类中重写了 onTap 方法。结果是，无论我在地图上的哪个位置触摸所有三个类的 onTap 都会被调用。

如果我触摸了我的绘图，我是否必须根据 onTap 的方法参数 GeoPoint 和我的当前位置进行计算？如何正确地做到这一点？将所有内容更改为 ItemizedOverlay？如果是这样，一些叠加层的复杂绘图怎么做？

10 倍 问候

Answer 1

我已经创建了解决方案：

@Override
public boolean onTap(GeoPoint geoPoint, MapView mapView) {
    // Gets mapView projection to use it with calculations
    Projection projection = mapView.getProjection();
    Point tapPoint = new Point();
    // Projects touched point on map to point on screen relative to top left corner
    projection.toPixels(geoPoint, tapPoint);

    // Gets my current GeoPoint location
    GeoPoint myLocationGeoPoint = getLocationGeoPoint();

    // Image on the screen width and height
    int pinWidth = myPin.getWidth();
    int pinHeight = myPin.getHeight();

    // Variable that handles whether we have touched on image or not
    boolean touched = false;

    if (myLocationGeoPoint != null) {
        Point myPoint = new Point();

        // Projects my current point on map to point on screen relative to top left corner
        projection.toPixels(myLocationGeoPoint , myPoint);

        // Because image bottom line is align with GeoPoint and this GeoPoint is in the middle of image we have to do some calculations
        // absDelatX should be smaller that half of image width because as I already said image is horizontally center aligned
        int absDeltaX = Math.abs(myPoint.x - tapPoint.x);
        if (absDeltaX < (pinWidth / 2)) {
            // Because image is vertically bottom aligned with GeoPoint we have to be sure that we hace touched above GeoPoint (watch out: points are top-left corner based)
            int deltaY = myPoint.y - tapPoint.y;
            if (deltaY < pinHeight) {
                // And if we have touched above GeoPoint and belov image height we have win!
                touched = true;
            }
        }
    }

    if (touched) {
        Log.d(TAG, "We have been touched! Yeah!");
    }

    return true;
}