如何在 SupportMapFragment 中使用 OSMDroid 在地图上启用 LongClick

Posted 2023-02-27

【中文标题】如何在 SupportMapFragment 中使用 OSMDroid 在地图上启用 LongClick

【英文标题】：How to enable LongClick on map with OSMDroid in SupportMapFragment

【发布时间】：2013-12-16 11:50:00

【问题描述】：

我有一个带有 OSMDroid 地图的 SupportMapFragment。如何通过点击地图来实现 LongClick/LongPress，以及如何到达这个纬度/经度？

这是我的代码。我有一个 Eclipse 错误（在按钮代码中）。

'公共类 MapFragment 扩展 SupportMapFragment 实现 OnMapClickListener、OnMapLongClickListener、OnCameraChangeListener

MyMapListener myMapListener;
MainActivity activity;
Marker newMarker;    
private static View view;   
private MapView mMapView;
private MapController mMapController;
@Override
  public void onAttach(Activity activity) 
    super.onAttach(activity);           
    this.activity=(MainActivity)activity;

  

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) 
    super.onCreateView(inflater, container, savedInstanceState);

    if (view != null) 
        ViewGroup parent = (ViewGroup) view.getParent();
        if (parent != null)
            parent.removeView(view);
    
    try 
        view = inflater.inflate(R.layout.map_fragment,
                container, false);
     catch (InflateException e) 
        /* map is already there, just return view as it is */
    


    mMapView = (MapView) view.findViewById(R.id.mapview);


    mMapView.setTileSource(TileSourceFactory.MAPNIK);


    mMapView.setBuiltInZoomControls(true);

    mMapController = (MapController) mMapView.getController();
    mMapController.setZoom(16);
    org.osmdroid.util.GeoPoint gPt = new org.osmdroid.util.GeoPoint((int) (50.2937 * 1E6),
            (int) (30.6437 * 1E6));
    mMapController.setCenter(gPt);      
    return view;



@Override
public void onResume() 
    super.onResume();



private void setUpMapIfNeeded() 
    if (mMap == null) 
        mMap = ((SupportMapFragment) activity.getSupportFragmentManager().findFragmentById(R.id.map))
                .getMap();
        if (mMap != null) 
            setUpMap();
        
    
    

@Override
public void onMapClick(LatLng point) 



@Override
public void onMapLongClick(LatLng point) 

    activity.ll3buttons.setVisibility(View.VISIBLE);
     newMarker = mMap.addMarker(new MarkerOptions()
    .position(point)
    .title(ArraysEnums.contoureType[activity.bc.getContoureType()])
    .snippet(ArraysEnums.coordSource[activity.bc.getCoordSource()])
    .icon(BitmapDescriptorFactory.fromResource(R.drawable.abc_ic_menu_share_holo_dark)));
    sendPoint(point);


@Override
public void onCameraChange(final CameraPosition position) 


private void sendPoint(LatLng point)
    activity.setCustomCoordReadyToWrite(point);

@Override
public boolean dispatchTouchEvent(MotionEvent ev) 

    int actionType = ev.getAction();

    if (actionType == MotionEvent.ACTION_DOWN) 

        startTimeForLongClick=ev.getEventTime();
        xScreenCoordinateForLongClick=ev.getX();
        yScreenCoordinateForLongClick=ev.getY();

     else if (actionType == MotionEvent.ACTION_MOVE) 

        if (ev.getPointerCount()>1) 

            startTimeForLongClick=0;                         
         else 

            float xmove = ev.getX(); //where is their finger now?                   
            float ymove = ev.getY();

            xlow = xScreenCoordinateForLongClick - xtolerance;
            xhigh= xScreenCoordinateForLongClick + xtolerance;
            ylow = yScreenCoordinateForLongClick - ytolerance;
            yhigh= yScreenCoordinateForLongClick + ytolerance;
            if ((xmove<xlow || xmove> xhigh) || (ymove<ylow || ymove> yhigh))

                startTimeForLongClick=0;
            
        

     else if (actionType == MotionEvent.ACTION_UP)            
        long eventTime = ev.getEventTime();
        long downTime = ev.getDownTime();            
        if (startTimeForLongClick==downTime)                 
            if ((eventTime-startTimeForLongClick)>minMillisecondThresholdForLongClick)                    
                float xup = ev.getX();                  
                float yup = ev.getY();                    
                xlow = xScreenCoordinateForLongClick - xtolerance;
                xhigh= xScreenCoordinateForLongClick + xtolerance;
                ylow = yScreenCoordinateForLongClick - ytolerance;
                yhigh= yScreenCoordinateForLongClick + ytolerance;
                if ((xup>xlow && xup<xhigh) && (yup>ylow && yup<yhigh))                         
                    long totaltime=eventTime-startTimeForLongClick;
                    String strtotaltime=Long.toString(totaltime);                               
                    Log.d("long press detected: ", strtotaltime);                       

                
            
        

    


    return super.dispatchTouchEvent(ev);//Eclipse error==The method dispatchTouchEvent(MotionEvent) is undefined for the type SupportMapFragment

'

【问题讨论】：

你尝试了什么？贴一些代码，以便有人可以帮助您！

【参考方案1】：

转实现如下：

MapEventsReceiver mReceive = new MapEventsReceiver() 

    @Override
    public boolean singleTapUpHelper(IGeoPoint arg0) 
        Log.d("debug", "Single tap helper");
        //your onSingleTap logic here
        return false;
    

    @Override
    public boolean longPressHelper(IGeoPoint arg0) 
        Log.d("debug", "LongPressHelper");
        //your onLongPress logic here                  
        return false;
    
;

MapEventsOverlay OverlayEventos = new MapEventsOverlay(activity.getBaseContext(), mReceive);
mMapView.getOverlays().add(OverlayEventos);

//Refreshing the map to draw the new overlay
mMapView.invalidate();