osmdroid-longpreshelper仅在第一次用于添加标记时激发

Question

    mapview = (MapView) findViewById(R.id.mapview);
    mapview.setTileSource(TileSourceFactory.MAPNIK);
    mapview.setBuiltInZoomControls(true);
    mapview.setMultiTouchControls(true);

    IMapController mapController = mapview.getController();
    mapController.setZoom(16);
    GeoPoint startPoint = new GeoPoint(48.8583, 2.2944);
    mapController.setCenter(startPoint);

    MapEventsReceiver meReceiver = new MapEventsReceiver() {

        @Override
        public boolean singleTapConfirmedHelper(GeoPoint p) {
            return false;
        }

        @Override
        public boolean longPressHelper(GeoPoint p) {

            Toast toast = Toast.makeText(getApplicationContext(), "DEBUGDEBUGDEBUG", Toast.LENGTH_LONG);
            toast.show();

            addMarker(p);



            return true;
        }
    };

addMarker-由longpreshelper调用public void addMarker（GeoPoint GeoPoint）{

    Drawable dr = getResources().getDrawable(R.drawable.icn_crosshair_red);
    Bitmap bitmap = ((BitmapDrawable) dr).getBitmap();
    Drawable d = new BitmapDrawable(getResources(), Bitmap.createScaledBitmap(bitmap, 100, 100, true));

    mapview.getOverlays().clear();
    mapview.invalidate();

    selectedPosMarker = new Marker(mapview);
    selectedPosMarker.setPosition(geoPoint);

    selectedPosMarker.setInfoWindow(null);

    selectedPosMarker.setIcon(d);
    selectedPosMarker.setAnchor(Marker.ANCHOR_CENTER, Marker.ANCHOR_BOTTOM);


    mapview.getOverlays().add(selectedPosMarker);
    mapview.invalidate();
}

Answer 1

我假设您在某个地方添加了一个MapEventsOverlay，在您没有提供的代码中。问题是您在AddMarker中删除了它！：

mapview.getOverlays().clear();

所以它当然不会对第二次长按做出反应...

不要在同一个方法中调用MapView.Invalidate（）两次，这既没用又费时。