How do I call onDraw method for custom view in Android?

See more:

Java

Mobile

Android

I am working on an Android game where I need to draw a 2d array of circles onto a custom view. I have the method to draw the circles, but don't know how to call it. Here is the code for it.

public Canvas drawCircles(Canvas canvas) {
		circlePaint = new Paint();
		circlePaint.setDither(true);
		circlePaint.setColor(Color.BLACK);  // alpha.r.g.b
		circlePaint.setStyle(Paint.Style.STROKE);
		circlePaint.setStrokeJoin(Paint.Join.ROUND);
		circlePaint.setStrokeCap(Paint.Cap.ROUND);
		circlePaint.setStrokeWidth(2);

		int numCircles = screenWi / 100;
		int circleDia = screenWi / numCircles;
		for (int i = 0; i < numCircles; i++) {
			for (int j = 0; i < numCircles; j++) {
				circleLocations.add(new Point(screenWi - (j * (circleDia / 2)), screenHi - (i * (circleDia / 2))));
			}
		}

		for (Point point : circleLocations) {
			canvas.drawCircle(point.x, point.y, circleDia / 2, circlePaint);
		}
		return canvas;
	}

I am pretty much clueless on how to do this. Also, how to do you get the screenWi and screenHi. I have an onMeasure method that just calls its super. Thanks!!