Here is an example that draws a point at the current center of the
map. Move the map and you get another point with a line in between.
You can see the result here:
http://android-schweiz.blogspot.com/
Be careful, I am in the middle of writing the code,it's ugly but it
does work.
As you can see, there is indeed an ontab method and i really do use
getProjection, as i want to do some custom drawing.
If you just want to set a marker, there are easier ways. Google for
any tutorial on that topic .-)
Greetings from Berne,
Stephan
@SuppressWarnings("unchecked")
public class TrackingOverlay extends ItemizedOverlay {
Context mContext;
private ArrayList<OverlayItem> overlays = new
ArrayList<OverlayItem>();
private ArrayList<GeoPoint> points = new ArrayList<GeoPoint>();
public static final String TAG = ShowMap.TAG;
private static Paint linePaint;
public static String dateString = "Date";
public TrackingOverlay(Drawable defaultMarker) {
super(boundCenterBottom(defaultMarker));
linePaint = new Paint();
linePaint.setColor(Color.GREEN);
linePaint.setStrokeWidth(10);
linePaint.setDither(true);
linePaint.setStyle(Style.FILL);
linePaint.setAntiAlias(true);
linePaint.setStrokeJoin(Paint.Join.ROUND);
linePaint.setStrokeCap(Paint.Cap.ROUND);
populate();
}
public void addOverlay(OverlayItem overlay) {
overlays.add(overlay);
setLastFocusedIndex(-1);
// Each time we add a new OverlayItem, we must call populate(),
which
// will read each of out OverlayItems and prepare them to be
drawn.
populate();
}
public void addItem(GeoPoint p) {
Calendar cal = Calendar.getInstance();
DateFormat formatter = new SimpleDateFormat();
String date = formatter.format(cal.getTime()); // 09.06.06 14:00
MarkerOverlayItem item = new MarkerOverlayItem(p, points.size()
+
"", "Lat: "
+ p.getLatitudeE6() + "\nLong: " +
p.getLongitudeE6() + "\n" +
dateString + ": "
+ date, points.size());
item.date = date;
overlays.add(item);
points.add(p);
setLastFocusedIndex(-1);
populate();
}
public void repopulate() {
populate();
}
public void addOverlays(List list) {
for (Iterator iterator = list.iterator(); iterator.hasNext();) {
OverlayItem overlay = (OverlayItem) iterator.next();
overlays.add(overlay);
}
setLastFocusedIndex(-1);
populate();
}
public void draw(Canvas canvas, MapView view, boolean shadow) {
// super.draw(canvas, view, false);
int size = points.size();
if (size == 0)
return;
int rad = 15;
RectF oval = null;
Point lastPoint = new Point();
GeoPoint p = points.get(0);
view.getProjection().toPixels(p, lastPoint);
int x = lastPoint.x;
int y = lastPoint.y;
oval = new RectF(x - rad, y - rad, x + rad, y + rad);
canvas.drawOval(oval, linePaint);
}
@Override
protected OverlayItem createItem(int i) {
return overlays.get(i);
}
@Override
public int size() {
return overlays.size();
}
@Override
protected boolean onTap(int index) {
// anzeigen: Coordinaten, datum hinzugefügt
Log.d(ShowMap.TAG, "onTap " + index);
return true;
}
}
On 19 Jan., 18:17, Dudero <sinfanh...@googlemail.com> wrote:
> Hello
>
> I want to mark( with a colored point) all the the positions which are
> clicked on the screen.
>
> I found something like overriding the onTap(GeoPoint p, MapView)-
> Method of an Overlay, but I do not understand how to draw then this
> points into a MapView. Do i have to call the draw()-method for each
> new point?
>
> Of course the GeoPoint has to be transformed into pixel-format with
> the "getProjection().toPixels(GeoPoint gp,Point px)"-method.
>
> Can somebody give me a good template?
>
> Greetz dudero
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