相关疑难解决方法(0)

我的应用程序中有一个活动,其中有我用作地图的图像.如果图像与Google地图"网格对齐",那么当我使用地图的左上角和右下角时,我会从googlemaps在线获取,然后我可以将用户gps转换为屏幕上的x和y.但是,如果地图不是"网格对齐"并且与我的数学返回值成一定角度,则会将用户位置偏离屏幕.显然,我错过了关于如何处理地图角度的部分,所以如果有人能够阐明如何做到这一点,那将是非常有帮助的.

我知道我必须以弧度计算角度并进行一些转换,但我不知道从哪里开始.这是我用来获得x和y到目前为止在画布上绘图的方法.

public double[] getPositionGPS(Location upperLeft, Location lowerRight, Location current){

    try{

        double hypotenuse = upperLeft.distanceTo(current);
        double bearing = upperLeft.bearingTo(current);
        double currentDistanceY = Math.cos(bearing * Math.PI / OneEightyDeg) * hypotenuse;
        //                           "percentage to mark the position"
        double totalHypotenuse = upperLeft.distanceTo(lowerRight);
        double totalDistanceY = totalHypotenuse * Math.cos(upperLeft.bearingTo(lowerRight) * Math.PI / OneEightyDeg);
        double currentPixelY = currentDistanceY / totalDistanceY * ImageSizeH;

        double hypotenuse2 = upperLeft.distanceTo(current);
        double bearing2 = upperLeft.bearingTo(current);
        double currentDistanceX = Math.sin(bearing2 * Math.PI / OneEightyDeg) * hypotenuse2;
        //                           "percentage to mark the …

当我在设备上加载谷歌地图时,我有时会收到下面的屏幕.如第二次加载,如下所示. 否则它完全像正常的谷歌地图与路线我使用SupportmapFragment并获得googleMap对象.

 supportMapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map_view_fragment);

下面是在activity/fragment中显示map的代码

public static void drawRouteIntoMap(final List<? extends MapHelper> position, final GoogleMap googleMap) {
        /*List<MapHelper> position = new ArrayList<MapHelper>();
        for (int i = lastPosition; i < maps.size(); i++) {
            position.add(maps.get(i));
        }*/
        final LatLngBounds.Builder mapBounds = new LatLngBounds.Builder();
        if (position.size() > 0 && Validator.isNotNull(googleMap)) {
            googleMap.clear();
            List<PolylineOptions> polylineOptionses = new ArrayList<PolylineOptions>();
            PolylineOptions option = null;
            Boolean lastPause = null;
            for (MapHelper map : position) {
                if (map.isPause()) {
                    if (Validator.isNull(lastPause) || !lastPause) {
                        option = new …