我想将图标从一个位置点移动到另一个位置，图标应该在android中将一个位置移动到另一个位置

问题描述

我正在开发一款汽车应用程序。我想将图标移动到 android 中的另一个位置。我已尝试删除旧地图图标并清除所有图标并生成新图标。它工作完美。但它看起来不太好。我想将图标从一个位置移动到像 Ola app 这样的新位置，并且我正在使用汽车图标，因此我想在将位置更改为90度时转弯图标。

I am working on a car tacking app. I want to move the icon to another location in android I had already tried to remove old map icon and clearing all icons and generating new icon. It is working perfectly. But it's not looking good. I want to move the icon from one location to a new location like Ola app and I am using car icon so I want turn icon when change the location into 90 degrees.

推荐答案

private double bearingBetweenLocations(LatLng latLng1, LatLng latLng2) {
        final double PI = 3.14159;
        final double lat1 = latLng1.latitude * PI / 180;
        final double long1 = latLng1.longitude * PI / 180;
        final double lat2 = latLng2.latitude * PI / 180;
        final double long2 = latLng2.longitude * PI / 180;

        final double dLon = (long2 - long1);

        final double y = Math.sin(dLon) * Math.cos(lat2);
        final double x = Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
                * Math.cos(lat2) * Math.cos(dLon);

        double brng = Math.atan2(y, x);

        brng = Math.toDegrees(brng);
        brng = (brng + 360) % 360;

        return brng;
    }

计算旋转角度。然后 onLocationChanged（）再次设置图片：

Calculate the degree of rotation.And then onLocationChanged() set the image again:

@Override
    public void onLocationChanged(Location location) {
        if (location == null)
            return;
        if (mMap != null) {
            if (mPositionMarker != null && mPositionMarker.isVisible()) {
                mPositionMarker.remove();
            }
            newLatLng = new LatLng(location.getLatitude(), location.getLongitude());
            if (oldLatLng != null) {
                mPositionMarker = mMap.addMarker(new MarkerOptions()
                        .flat(true)
                        .anchor(0.5f, 0.5f).icon(BitmapDescriptorFactory
                                .fromResource(R.drawable.ic_cab_top)).rotation((float) bearingBetweenLocations(newLatLng, oldLatLng))
                        .position(new LatLng(location.getLatitude(), location
                                .getLongitude())));
                animateMarker(mPositionMarker, location); // Helper method for smooth animation
                mMap.animateCamera(CameraUpdateFactory.newLatLng(new LatLng(location
                        .getLatitude(), location.getLongitude())));
            }
            oldLatLng = newLatLng;
        }

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