Android：使覆盖图像可点击

Question

我希望有人能帮忙解决这个问题。我创建了一个地图应用程序，它将图标放在 xml 文件中的位置上，但我需要使图标可单击以打开有关该位置的信息页面。

目前，我在类 GPSLocationListener 实现 LocationListener 下有这个：

MapOverlay mapOverlay = new MapOverlay();
mapOverlay.setPointToDraw(point, "pointer", null);

List<Overlay> listOfOverLays = mapView.getOverlays();
listOfOverLays.clear();

// doc is data from xml file                
NodeList nodes = doc.getElementsByTagName("result");

listOfOverLays.add(mapOverlay);

for (int i = 0; i < nodes.getLength(); i++) {                       

    Element e = (Element)nodes.item(i);

    String locId = XMLfunctions.getValue(e, "id");
    String aString = XMLfunctions.getValue(e, "lat");
    double lat = Double.parseDouble(aString);
    String bString = XMLfunctions.getValue(e, "long");
    double longi = Double.parseDouble(bString);


    // here, 'point' and mapOverlay have already been created and added                                 
    GeoPoint point2 = new GeoPoint((int) (lat * 1E6), (int) (longi * 1E6));
    MapOverlay mapOverlay2 = new MapOverlay();
    mapOverlay2.setPointToDraw(point2, "place", XMLfunctions.getValue(e, "name"));
    OverlayItem item = new OverlayItem(point2, "", "");
    listOfOverLays.add(mapOverlay2);
    }   

在这个类之外，我有一个类来创建位置图标并分配位置名称：

class MapOverlay extends Overlay{
    private GeoPoint pointToDraw;
    private String pointerIcon;
    private String locName;

    public void setPointToDraw(GeoPoint point, String pointer, String locationName){
        pointToDraw = point;
        pointerIcon = pointer;
        locName = locationName;
    }

    @Override
    public boolean draw(Canvas canvas, MapView mapView, boolean shadow, long when){
        super.draw(canvas, mapView, shadow);

        // convert point to pixels
        Point screenPts = new Point();

        mapView.getProjection().toPixels(pointToDraw, screenPts);

        // add marker
        if(pointerIcon == "pointer"){

            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pointer);
            canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 22, null);
        }
        else if(pointerIcon == "bar"){
            Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.pointer2);
            canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 15, null);
            Paint paint = new Paint();
            paint.setColor(Color.BLACK);
            paint.setTextSize(20);
            canvas.drawText(locName, screenPts.x, screenPts.y-20, paint);
        }

        return true;
    }
}

我只需要使图像“pointer2”可单击并使用“打开一个新页面” locId'，这样我就知道哪个位置被点击了。我在网上阅读了很多关于这样做的内容，但没有任何效果。任何可以让我更接近完成这项工作的信息都非常感谢。

Answer 1

对它进行了排序，但几乎必须从头开始并使用逐项覆盖。这是我引用的内容：http://blog。 chrisblunt.com/android-map-view-double-taps-and-overlay-markers/