Holo progressbar glow effect

Question

I'm using canvas to draw my custom shape, and I want to add glow effect on it's end like in Android Progressbar View. I tried to look at Android sources, but did not found how exactly such effect is achieved.

Answer 1

The glow effect is part of the PNG image, see its source file. It is used (indirectly via drawable/progress_horizontal_holo_light) as value of android:progressDrawable.

Answer 2

You can achieve the glowing by using a BlurMaskFilter which can be used via paint.setFilterMask(maskFilter).

You might need to make multiple draws with different filters to achieve some cool effects.