private void start() {
startTime = animation.getStartTime();
startOffset = animation.getStartOffset();
Choreographer choreographer = ShadowChoreographer.getInstance();
if (animationRunner != null) {
choreographer.removeCallbacks(Choreographer.CALLBACK_ANIMATION, animationRunner, null);
}
animationRunner = this;
int startDelay;
if (startTime == Animation.START_ON_FIRST_FRAME) {
startDelay = (int) startOffset;
} else {
startDelay = (int) ((startTime + startOffset) - SystemClock.uptimeMillis());
}
choreographer.postCallbackDelayed(Choreographer.CALLBACK_ANIMATION, this, null, startDelay);
}
@Override
public void run() {
// Abort if start time has been messed with, as this simulation is only designed to handle
// standard situations.
if ((animation.getStartTime() == startTime && animation.getStartOffset() == startOffset)
&& animation.getTransformation(
startTime == Animation.START_ON_FIRST_FRAME
? SystemClock.uptimeMillis()
: (startTime + startOffset + elapsedTime),
new Transformation())
&&
// We can't handle infinitely repeating animations in the current scheduling model,
// so abort after one iteration.
!(animation.getRepeatCount() == Animation.INFINITE
&& elapsedTime >= animation.getDuration())) {
// Update startTime if it had a value of Animation.START_ON_FIRST_FRAME
startTime = animation.getStartTime();
elapsedTime += ShadowChoreographer.getFrameInterval() / TimeUtils.NANOS_PER_MS;
ShadowChoreographer.getInstance()
.postCallback(Choreographer.CALLBACK_ANIMATION, this, null);
} else {
animationRunner = null;
}
}