[android-developers] Re: What is best method for an animation worker thread?

I changed the logic of the asyncTask to be based on time rather than
point position, at least now I dont have a sleep but it would probably
hammer the UI thread. But I guess thats what I want to get smooth
animation. Should this be in the beginners thread? Anyway here is the
new pseudo-code:

--------------------------------------------------------------------------------
private class AnimationTask extends AsyncTask<Long, Long, Void>
{
@Override
protected Void doInBackground(Long... parameters)
{
//~ Figure out the x offset we are animating from and to

//~ Figure out the animation time

android.view.animation.Interpolator interpolater =
AnimationUtils.loadInterpolator(mContext,
android.R.anim.decelerate_interpolator);

long startTime = System.currentTimeMillis();
int lastOffset = targetOffset;

while (System.currentTimeMillis() - startTime < animationTime && !
isCancelled())
{
Float point = new Float(System.currentTimeMillis() - startTime) /
new Float(animationTime);
Float interpolation = interpolater.getInterpolation(point);
Float position = new Float(targetDistance) * interpolation;
int offset = initialOffset + position.intValue();

if (offset != lastOffset)
{
publishProgress(new Long(offset));

lastOffset = offset;
}
}

// Publish one final progress to cleanup any point difference after
loop
publishProgress(new Long(targetOffset));

return null;

// TODO: The task never seems to die? But it seems that android
// will only keep a maximum of five of these threads before it
// recycles one of the old threads to service a new one
}

@Override
protected void onProgressUpdate(Long... parameters)
{
int scrollOffset = parameters[0].intValue();

//~ Scroll the view to the offset
}
}
--------------------------------------------------------------------------------

Any further suggestions?

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