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android – Create Doughnut Chart Similar to Google Fit

Posted by: admin June 15, 2020 Leave a comment

Questions:

Does anyone know how to create a doughnut chart similar to the one in Google Fit. Is there a library for this?

Google Fit Chart

How to&Answers:

I also wanted this, but the best answer i could find was “make your own”.
So I did.

This is pretty basic (I’m new to android) and unfinished, but it should give you the idea.

Basically, you just set up your paint objects

    paintPrimary = new Paint();
    paintPrimary.setAntiAlias(true);
    paintPrimary.setColor(colorPrimary);
    paintPrimary.setStyle(Paint.Style.STROKE);
    paintPrimary.setStrokeCap(Paint.Cap.ROUND);

and call canvas.drawArc

class FitDoughnutView extends View {

    private RectF _oval;

    public FitDoughnutView(Context ctx) {
        super(ctx);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        canvas.drawArc(_oval, 0, 360, false, paintSecondary);

        canvas.drawArc(_oval, 270, percentDeg, false, paintPrimary);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        _oval = new RectF(width, width, w - width, h - width);
    }
}

Full source here:
github.com/tehmantra/fitdoughnut

Someone’s tutorial: hmkcode.com/android-canvas-how-to-draw-2d-donut-chart/

Answer:

I found this: https://github.com/txusballesteros/fit-chart

I hope this helps someone with the same problem.