[android-developers] choppy game

I used a Java Timer object and a TimerTask like this for some game
physics

if (!timergoing)
{
PhysicsTask physicsTask = new PhysicsTask();

Timer tm = new Timer();
tm.scheduleAtFixedRate(physicsTask, 1000, (long) (1000.0f/
physicsFrameRate));
}

However, the physics was somewhat choppy to my surprise. Anyone know
what the deal is with this and how to make it better?

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