Draw circle shape in canvas is very easy thing to do if you are familiar with Canvas in Android. Please checkout this tutorial if you don’t know about how to create basic Canvas, display it to ImageView and save it as Bitmap.
Here we draw one canvas of 500×500 resolution and draw circle shape in the middle of the canvas.
The below line will draw circle shape in canvas.
canvas.drawCircle(x, y, radius, paint);
Here we pass x and y as the center coordinats of the circle. radius represents the radius of the circle being drawn. And paint is the Paint for drawing circle.
Now we will write the full code to draw circle in canvas.
Paint pBackground = new Paint();
canvas.drawRect(0, 0, 512, 512, pBackground);
Paint pCircle = new Paint();
canvas.drawCircle(256, 256, 256, pCircle);
You can draw different type of line on Canvas in Android. You can change it’s color, stroke, effect, etc. Here we will see the basics of drawing line on Canvas.
Checkout the basics of Canvas if you are new to Canvas: Draw Canvas on ImageView
Here is the example of different parameters you can apply to draw a line on Canvas in Android.
Draw line on Canvas
Paint p1 = new Paint();
canvas.drawLine(10, 40, 400, 40, p1);
//line with color
Paint p2 = new Paint();
canvas.drawLine(10, 80, 400, 80, p2);
//line with round ends
Paint p3 = new Paint();
canvas.drawLine(10, 120, 400, 120, p3);
Paint p4 = new Paint();
canvas.drawLine(10, 160, 400, 200, p4);
Here we use AntiAlias flag to true to remove distortion in the lines.