MainActivity.java 文件源码

private void drawCircles(Canvas canvas) {
    canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG
            | Paint.FILTER_BITMAP_FLAG));

    Paint paint = new Paint();
    paint.setAntiAlias(true);
    paint.setColor(0xffffffff);

    RectF r = new RectF(0, 0, canvas.getWidth(), canvas.getHeight());
    canvas.drawRect(r, paint);

    for (int i = radiusArray.length - 1; i >= 0; i--) {
        if (radiusArray[i] >= baseRadius) {
            paint.setColor(getColor(radiusArray[i]));

            canvas.drawCircle(canvas.getWidth() / 2,
                    canvas.getHeight() / 2, radiusArray[i], paint);
        }
    }

    paint.setColor(Color.argb(255, 0xfe, 0xaa, 0x4b));
    canvas.drawCircle(canvas.getWidth() / 2, canvas.getHeight() / 2,
            baseRadius, paint);
}