Using multiple DotSpan's in MaterialCalendarView

Question

Is there any way of attaching more than 1 DotSpan\'s to a date with Android MaterialCalendarView? Altough I have 2 DotSpan\'s added to my CalendarView it\'s still displaying onl

Answer 1

I had to figure a way to add multiple dots, the selected answer definitely helped me figure things out:

First off, you need a custom DotSpan class, which is just ever so slightly altered:

public class CustmMultipleDotSpan implements LineBackgroundSpan {


    private final float radius;
    private int[] color = new int[0];


    public CustmMultipleDotSpan() {
        this.radius = DEFAULT_RADIUS;
        this.color[0] = 0;
    }


    public CustmMultipleDotSpan(int color) {
        this.radius = DEFAULT_RADIUS;
        this.color[0] = 0;
    }


    public CustmMultipleDotSpan(float radius) {
        this.radius = radius;
        this.color[0] = 0;
    }


    public CustmMultipleDotSpan(float radius, int[] color) {
        this.radius = radius;
        this.color = color;
    }

    @Override
    public void drawBackground(
            Canvas canvas, Paint paint,
            int left, int right, int top, int baseline, int bottom,
            CharSequence charSequence,
            int start, int end, int lineNum
    ) {

        int total = color.length > 5 ? 5 : color.length;
        int leftMost = (total - 1) * -10;

        for (int i = 0; i < total; i++) {
            int oldColor = paint.getColor();
            if (color[i] != 0) {
                paint.setColor(color[i]);
            }
            canvas.drawCircle((left + right) / 2 - leftMost, bottom + radius, radius, paint);
            paint.setColor(oldColor);
            leftMost = leftMost + 20;
        }
    }
}

You will also need an ever so slightly altered EventDecorator:

public class EventDecorator implements DayViewDecorator {

    private final int[] colors;
    private final HashSet dates;


    public EventDecorator(Collection dates, int[] colors) {
        //this.color = color;
        this.dates = new HashSet<>(dates);

        this.colors = colors;

    }


    public EventDecorator(List filteredEvents) {
        //this.color = color;

        this.dates = new HashSet<>(filteredEvents.get(0).calDayArr);
        int[] colors = new int[1];
        colors[0] = filteredEvents.get(0).color;
        this.colors = colors;

    }

    @Override
    public boolean shouldDecorate(CalendarDay day) {
        return dates.contains(day);
    }

    @Override
    public void decorate(DayViewFacade view) {

        view.addSpan((new CustmMultipleDotSpan(5,colors)));

    }


}

And that is basically it.

Now find your calendarview in your activity, and give it some dates, and colors to show on those dates. In my particular case, I sort my dates in 5 different lists based on the amount of events per day, so you will end up with something like

calendarView.addDecorator(new EventDecorator(threeEventDays,threeColors));

Where threeEventDays is a Collection of CalendarDay and threeColors is an int array

int[] threeColors = {
Color.rgb(0, 0, 255),
Color.rgb(0, 255, 0),
Color.rgb(255, 0, 0)};

It's nowhere near as ideal as it should be, but what it does is it expects an array of colors. Calculates the leftmost position, based on the array size, so for a size one, the left most position is the middle dot we all know and love. For size 2 the left most position is -10, for size 3 it's -20 and so on. Then loops through and paints the dots.

It's limited to 5 event dots as it gets quite ugly above that, and though currently not on my roadmap, if it turns out to be a requirement I might add support for a second line of dots.