OSMdroid bounds marker - osmdroid

Question

////OSMdroid centered on the markers////
I add markers, I need to map the maximum increases or decreases in such a way that all markers were visible
my code:
public class mapcode extends Activity {
globalvar appState;
int stats=0;
private MapView mapView;
private IMapController mapController;
private SimpleLocationOverlay mMyLocationOverlay;
private ScaleBarOverlay mScaleBarOverlay;
ItemizedIconOverlay<OverlayItem> currentLocationOverlay;
DefaultResourceProxyImpl resourceProxy;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.map);
appState = ((globalvar) getApplicationContext());
mapView = (MapView) this.findViewById(R.id.mapview);
mapView.setTileSource(TileSourceFactory.MAPNIK);
// mapView.setBuiltInZoomControls(true); //кнопка ZOOM +-
mapView.setMultiTouchControls(true);
mapController = this.mapView.getController();
mapController.setZoom(2);
this.mMyLocationOverlay = new SimpleLocationOverlay(this);
this.mapView.getOverlays().add(mMyLocationOverlay);
this.mScaleBarOverlay = new ScaleBarOverlay(this);
this.mapView.getOverlays().add(mScaleBarOverlay);
// this.mapView
/////////////////
resourceProxy = new DefaultResourceProxyImpl(getApplicationContext());
GeoPoint currentLocation = new GeoPoint(55.860863,37.115046);
GeoPoint currentLocation2 = new GeoPoint(63.557413,-156.102119);
OverlayItem myLocationOverlayItem = new OverlayItem("Here", "Current Position", currentLocation);
Drawable myCurrentLocationMarker = this.getResources().getDrawable(R.drawable.a);
myLocationOverlayItem.setMarker(myCurrentLocationMarker);
// myLocationOverlayItem.setMarkerHotspot(HotspotPlace.CENTER); //no working/
final ArrayList<OverlayItem> items = new ArrayList<OverlayItem>();
items.add(myLocationOverlayItem);
myLocationOverlayItem = new OverlayItem("Here", "Current Position", currentLocation2);
myCurrentLocationMarker = this.getResources().getDrawable(R.drawable.a);
myLocationOverlayItem.setMarker(myCurrentLocationMarker);
// myLocationOverlayItem.setMarkerHotspot(HotspotPlace.CENTER); // no working
items.add(myLocationOverlayItem);
currentLocationOverlay = new ItemizedIconOverlay<OverlayItem>(items,
new ItemizedIconOverlay.OnItemGestureListener<OverlayItem>() {
public boolean onItemSingleTapUp(final int index, final OverlayItem item) {
return true;
}
public boolean onItemLongPress(final int index, final OverlayItem item) {
return true;
}
}, resourceProxy);
this.mapView.getOverlays().add(this.currentLocationOverlay);
}
I added two markers, but only one is visible:
and I need to osmdroid is centered and immediately showed both marker

Answer 1

I think you want something like this:
int minLat = Integer.MAX_VALUE;
int maxLat = Integer.MIN_VALUE;
int minLong = Integer.MAX_VALUE;
int maxLong = Integer.MIN_VALUE;
ArrayList<OverlayItem> items = new ArrayList<OverlayItem>();
for (OverlayItem item : items) {
GeoPoint point = item.getPoint();
if (point.getLatitudeE6() < minLat)
minLat = point.getLatitudeE6();
if (point.getLatitudeE6() > maxLat)
maxLat = point.getLatitudeE6();
if (point.getLongitudeE6() < minLong)
minLong = point.getLongitudeE6();
if (point.getLongitudeE6() > maxLong)
maxLong = point.getLongitudeE6();
}
BoundingBoxE6 boundingBox = new BoundingBoxE6(maxLat, maxLong, minLat, minLong);
mMapView.zoomToBoundingBox(boundingBox);

Answer 2

You can calculate boundingBox by BoundingBox.fromGeoPoints(geoPoints)
fun zoomToBounds(points: List<LatLng>) {
val geoPoints = points.map { GeoPoint(it.latitude, it.longitude) }
val boundingBox = BoundingBox.fromGeoPoints(geoPoints)
mapView.zoomToBoundingBox(boundingBox, true)
}
It is also possible to have some paddings by using zoomtoBoundingBox overloaded method and setting the pBorderSizeInPixels parameter
public double zoomToBoundingBox(
final BoundingBox pBoundingBox,
final boolean pAnimated,
final int pBorderSizeInPixels,
final double pMaximumZoom,
final Long pAnimationSpeed
)