無法從Google地圖獲取touchevent

Question

我在註冊某人時遇到了某些人在地圖上某處觸摸過的問題。

我有這個源

public class GMapsActivity extends MapActivity { 

private MapView mapView; 

private static final int latitudeE6 = 37985339; 
private static final int longitudeE6 = 23716735; 

@Override 
public void onCreate(Bundle savedInstanceState) { 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 

    mapView = (MapView) findViewById(R.id.map_view);  
    mapView.setBuiltInZoomControls(true); 

    List<Overlay> mapOverlays = mapView.getOverlays(); 
    Drawable drawable = this.getResources().getDrawable(R.drawable.icon); 
    CustomItemizedOverlay itemizedOverlay = new CustomItemizedOverlay(drawable, this); 

    GeoPoint point = new GeoPoint(latitudeE6, longitudeE6); 
    OverlayItem overlayitem = new OverlayItem(point, "Hello", "I'm in Athens, Greece!"); 

    itemizedOverlay.addOverlay(overlayitem); 
    mapOverlays.add(itemizedOverlay); 
    //mapOverlays.add(TouchOverlay); 

    MapController mapController = mapView.getController(); 

    mapController.animateTo(point); 
    mapController.setZoom(6); 

} 

@Override 
protected boolean isRouteDisplayed() { 
    return false; 
} 


class MapOverlap extends com.google.android.maps.Overlay { 

    public boolean onTouchEvent(MotionEvent event, MapView mapView) { 
     if (event.getAction() == 1){ 
      GeoPoint p = mapView.getProjection().fromPixels((int) event.getX(), (int) event.getY()); 
      Toast.makeText(getBaseContext(), p.getLatitudeE6()/1E6 + "," + p.getLongitudeE6()/1E6 , Toast.LENGTH_SHORT).show(); 
     } 
     return false; 
    } 
    } 

}

而且CustomItemizedOverlay

public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> { 

private ArrayList<OverlayItem> mapOverlays = new ArrayList<OverlayItem>(); 

private Context context; 

public CustomItemizedOverlay(Drawable defaultMarker) { 
     super(boundCenterBottom(defaultMarker)); 
} 

public CustomItemizedOverlay(Drawable defaultMarker, Context context) { 
     this(defaultMarker); 
     this.context = context; 
} 

@Override 
protected OverlayItem createItem(int i) { 
    return mapOverlays.get(i); 
} 

@Override 
public int size() { 
    return mapOverlays.size(); 
} 

@Override 
protected boolean onTap(int index) { 
    OverlayItem item = mapOverlays.get(index); 
    AlertDialog.Builder dialog = new AlertDialog.Builder(context); 
    dialog.setTitle(item.getTitle()); 
    dialog.setMessage(item.getSnippet()); 
    dialog.show(); 
    return true; 
} 

public void addOverlay(OverlayItem overlay) { 
    mapOverlays.add(overlay); 
    this.populate(); 
} 

}

我在（但它似乎並沒有做任何事情）

添加

class MapOverlap extends com.google.android.maps.Overlay { 

public boolean onTouchEvent(MotionEvent event, MapView mapView) { 
    if (event.getAction() == 1){ 
     GeoPoint p = mapView.getProjection().fromPixels((int) event.getX(), (int) event.getY()); 
     Toast.makeText(getBaseContext(), p.getLatitudeE6()/1E6 + "," + p.getLongitudeE6()/1E6 , Toast.LENGTH_SHORT).show(); 
    } 
    return false; 
} 

我是否正確實現了類？有誰知道如何解決這一問題？

Answer 1

在你的第二個構造函數，你缺少這行代碼：

super(boundCenterBottom(defaultMarker)); 

相反的：

this(defaultMarker);