239_自定义View画圆环环形

画个圆环


圆环其实就是一个外圆一个内圆




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


        //获取宽高
        int width = getWidth();
        int height = getHeight();


        //初始化数据,半径,颜色,圆环宽度
        int radius = width / 2;
        int color = R.color.black;
        int ringWidth = 40;


        //创建画笔
        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);


        //画外圆
        paint.setColor(ContextCompat.getColor(context, color));
        canvas.drawCircle(radius, radius, radius, paint);


        //画内圆
        paint.setColor(Color.WHITE);
        canvas.drawCircle(radius, radius, radius - ringWidth, paint);
    }