How to create fireworks particle graphics effect on android

Question

Anybody has any idea how to make a fireworks effect by drawing on canvas? There is one nice example in wireworks live wallpaper (free app).

There, many points move and leave trails in a star like explosion and gradually disappear. I think that there is some kind of motion blur on each point moving, which I am not sure how to create.

Any ideas or links to relevant examples are welcome.