In solving another problem I had I have written a gallery style view
based on framelayout which supports fling, animated transitions,
adapters, etc. Ill post it up as an example soon. But for now im not
really sure I have used the best approach for running the animation
threads.
I decided to use my own animation thread rather than any standard
transitions because they didnt seem to repaint all the views correctly
during the animation (I am working in a framelayout and scrolling
three views about, ive seen a couple of other posts about the repaint
issue but no solutions).
Anyway, rightly or wrongly I used an AsyncTask. The bit I am worried
about is the Thread.sleep() call. Seems kinda the wrong way to go
about it to me. Here is the psuedo-code for what I am doing (ive
removed alot of junk not relevant to my question):
-------------------------------------------------------------------------------
private class AnimationTask extends AsyncTask<Long, Long, Void>
{
@Override
protected Void doInBackground(Long... parameters)
{
try
{
//~ Figure out the x offset we are animating from and to
android.view.animation.Interpolator interpolater =
AnimationUtils.loadInterpolator(mContext,
android.R.anim.decelerate_interpolator);
// Step through interpolation animation points from 0.0
through to
1.0
for (Float point = 0.0f; point < 1.0f &&
!isCancelled(); point +=
step)
{
Float interpolation =
interpolater.getInterpolation(point);
Float position = new Float(targetDistance) *
interpolation;
int offset = initialOffset +
position.intValue();
publishProgress(new Long(offset));
//~ Figure out the wait time based on elapsed
time since animation
began
if (waitTime > 0)
{
Thread.sleep(waitTime, 0);
}
}
// Publish one final progress to cleanup any point
difference after
loop
publishProgress(new Long(targetOffset));
}
catch (InterruptedException e)
{
}
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
}
}
-------------------------------------------------------------------------------
Oh yeah, there is also that whole thing about the AsyncThreads still
running after you exit. I havent figured that one out yet.
Any suggestions?
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