我的应用程序中有2个ItemizedOverlay实例,一个是CurrentLocation实例,另一个是其他实例。我已将这2个叠加层添加到MapView

倾斜地图的刷新按钮时,我想更新CurrentLocation叠加层。如果我这样做了,则意味着它也显示了先前的当前位置,也显示了新的位置。如何删除上一个?

但是我还需要显示另一个覆盖图。

我将ItemizedOverlay细分为:

MyItemizedOverlay currentOverlay = new MyItemizedOverlay(pushPinDrawable);
MyItemizedOverlay anotherOverlay = new MyItemizedOverlay(drawable);


刷新按钮的代码:

if (currentGeo != null) {
    mapView.getOverlays().remove(currentOverlay);
    mapVite();
    mapOverlays = mapView.getOverlays();
    myLocationOverlay = new OverlayItem(currentGeo, "My Location", mapTime.format(new Date(myLocationTime)));
                                    // (currentGeo is the updated current geo point.)
    currentOverlay.addOverlay(myLocationOverlay);
    mapOverlays.add(currentOverlay);
    mapController.animateTo(currentGeo);
} else {
    Toast.makeText(this, "Your Current Location is temporarily unavailable", Toast.LENGTH_LONG).show();
}


任何想法?

最佳答案

你应该有这样的东西

public void onLocationChanged(Location location) {
        if (mMyOverlay == null) {
            mMyOverlay = new myOverlay(getResources().getDrawable(R.drawable.arrow), MyMap);
            MyMap.getOverlays().add(mMyOverlay);
        } else {
            MyMap.getOverlays().remove(mMyOverlay);
            MyMap.invalidate();
            mMyOverlay = new myOverlay(getResources().getDrawable(R.drawable.arrow), MyMap);
            MyMap.getOverlays().add(mMyOverlay);
        }
        if (location != null) {
            MyMap.invalidate();
            GeoPoint MyPos = new GeoPoint(microdegrees(location.getLatitude()), microdegrees(location.getLongitude()));
            MyController.animateTo(MyPos);
            mMyOverlay.addPoint(MyPos, "My position", "My position");
        }

10-08 17:53