Android：如何绘制此自定义形状

I'm new to Android, and I would like to know how to draw this blue shape:

我是Android新手，我想知道如何绘制这个蓝色形状：

Without using images, of course.

当然，不使用图像。

Thanks!

谢谢！

1 个解决方案

#1

The easy way would be your suggested solution, ie. drawing all circles with no alpha to a bitmap, then draw that bitmap to another one using the desired alpha. The hard way would be using blend modes, specifically PorterDuff.Mode in Android. An example can be found here.

简单的方法是你建议的解决方案，即。将所有没有alpha的圆绘制到位图，然后使用所需的alpha将该位图绘制到另一个位图。困难的方法是使用混合模式，特别是Android中的PorterDuff.Mode。这里有一个例子。

Also Check this http://softwyer.wordpress.com/2012/01/21/1009/

另请查看http://softwyer.wordpress.com/2012/01/21/1009/

An example

一个例子

Bitmap bitmap = Bitmap.createBitmap(b.getWidth(), b.getHeight(), b.getConfig());
        Canvas canvas = new Canvas(bitmap);
        Paint p =  new Paint(Paint.ANTI_ALIAS_FLAG);
        p.setColor(Color.BLACK);
        canvas.drawRoundRect(new RectF(0, 0, b.getWidth(), b.getHeight()), borderRadius, borderRadius, p);
        p.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
        canvas.drawBitmap(b, 0, 0, p);

#1