Question

我目前有一个应用程序，使用MapView向用户显示谷歌地图。

我一直在尝试使用此代码在地图上放置标记

public boolean onTouchEvent(MotionEvent event, MapView mapView) {
        if (event.getAction() == 1) {
            GeoPoint p = mapView.getProjection().fromPixels((int) event.getX(),
                    (int) event.getY());
            DemoOverlay demoOverlay = new DemoOverlay(); 
            mapView.getOverlays().add(demoOverlay);

            mapView.invalidate();
        }
        return false;
    }

我有一个Demo Overlay设置，它在地图上放置一个标记，但是当我触摸屏幕时，标记永远不会出现。

任何帮助将不胜感激!!!

Answer 1

GeoPoint p = mapView.getProjection().fromPixels((int) event.getX(),(int) event.getY());
Drawable srcdrawable = getApplicationContext().getResources().getDrawable(R.drawable.pin_blue);
CustomItemizedOverlay srcitemizedOverlay = new CustomItemizedOverlay(srcdrawable, getApplicationContext());
OverlayItem srcoverlayitem = new OverlayItem(p, "Hello!", "This is your Location.");
srcitemizedOverlay.addOverlay(srcoverlayitem);
mapView.getOverlays().clear();
mapView.getOverlays().add(srcitemizedOverlay);
mapController.animateTo(srcpoint);
mapController.setZoom(16);

在ontouch方法中使用上面的代码也使用下面的CustomItemizedOverlay.java类

public class CustomItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private final 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();
    }

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

}

Answer 2

android-mapviewballoons实际上是Android上最好的地图库之一。你为什么不试一试？：）

Adroid Mapview Balloons

Answer 3

here是在地图中添加多个标记的完整示例

如何在两个引脚之间绘制路径...

可能对你有帮助......

Answer 4

像这样修改你的代码---

public boolean onTouchEvent(MotionEvent event, MapView mapView) 
   {   

    if (event.getAction() == 1) { 

          p = mapView.getProjection().fromPixels(
                (int) event.getX(),
                (int) event.getY());
          Toast.makeText(getBaseContext(),p.getLatitudeE6() / 1E6 + "," +p.getLongitudeE6() /1E6 ,Toast.LENGTH_SHORT).show();

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

              OverlayItem overlayitem = new OverlayItem(p, "", "");
              itemizedOverlay.addOverlay(overlayitem);
              mapOverlays.add(itemizedOverlay);

          return true;
    }
     return false;
}

制作叠加层 -

AddItemizedOverlay.class -

   public class AddItemizedOverlay extends ItemizedOverlay<OverlayItem> {

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

       private Context context;

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

       public AddItemizedOverlay(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) {
          Log.e("Tap", "Tap Performed");
          return true;
       }

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

    }

当你触摸屏幕时它会显示出来。

Answer 5

感谢您的建议，但我决定按照这些教程，因为它们涵盖了我需要的内容， http://thenewboston.org/watch.php?cat=6&number=133

此视频特别是涵盖我的问题的视频，

http://thenewboston.org/watch.php?cat=6&number=141

添加自定义标记到地图 - Android

5 个答案: