Has looked through your code and saw one big perfomance issue:

protected void onDraw(Canvas canvas) {
    Paint foreground = new Paint(Paint.ANTI_ALIAS_FLAG);
...
}

It takes too much time when your try to allocate memory for Paint
object. If you work with animation it always calls invalidate() method
which redraws your View. Memory allocation for Paint should be outside
of onDraw() method (e.g. when you create your view, in it's
constructor) it will give you much better perfomance that you have
now. Try to do so and you'll see.

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