android - Syncing UI Thread and workhorse thread -

hi have 1 thread uses surfaceview draw screen thread updating positions of objects on screen. how make these run @ same speed?

there trade off:

• you want update screen sufficiently motion appears smooth.
• you want give cpu possible workhorse thread

the easy solution this:

1. the work horse thread sets flag indicating when there has been change worthy of redraw.

2. the ui thread has flow bit this

   do {     renderscreen();     while (!screenneedsredrawing) {         thread.sleep(10);     } }