AndroidPlot PieChart Touch Event

Question

I want to implement a PieChart with a SelectionWidget. Upon clicking on a segment within an AndroidPlot PieChart, I would like the selection widget label text to display info about the current selected segment. There is an example to do this for an XYPlot within the AndroidPlot demo but it does not translate over well to the PieChart. Any help would be appreciated. Thank you.

Answer 1

I just posted a solution to a similar question here. It was necessary to add a new method to the PieRenderer class but there's a link to a build of Androidplot containing the necessary changes. It's not a production build but for whatever it's worth, its at least as stable as the current production version of Androidplot. Once you have the new build, you'll be able to do something like this:

        // detect segment clicks:
        pie.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                PointF click = new PointF(motionEvent.getX(), motionEvent.getY());
                if(pie.getPieWidget().containsPoint(click)) {
                    Segment segment = pie.getRenderer(PieRenderer.class).getContainingSegment(click);
                    if(segment != null) {
                        // handle the segment click...for now, just print
                        // the clicked segment's title to the console:
                        System.out.println("Clicked Segment: " + segment.getTitle());
                    }
                }
                return false;
            }
        });

Just replace System.out.println(...) with your code to update the SelectionWidget.