private void updateBubbles() {
Iterator<Bubble> iterator = mBubbles.iterator();
boolean needToDraw = false;
while (iterator.hasNext()) {
Bubble bubble = iterator.next();
if (bubble.curTime <= DURATION) {
initBezierPointIfNeed(bubble);
bubble.curTime = bubble.curTime + STEP_PERIOD;
float factor = mInterpolator.getInterpolation(bubble.curTime / (float) (DURATION));
bubble.scale = ScaleInit + ScaleRange * factor;
calculateBezierPoint(
bubble.position,
factor,
bubble.startPoint,
bubble.ctrlPoint1,
bubble.ctrlPoint2,
bubble.endPoint);
// The last Half of the period make transparency change
if (bubble.curTime > DURATION / 2) {
float alphaFactor =
mAlphaInterpolator.getInterpolation(
(bubble.curTime - DURATION / 2) / (float) (DURATION / 2));
bubble.alpha = AlphaInit + (int) (AlphaRange * alphaFactor);
}
needToDraw = true;
} else {
iterator.remove();
}
}
if (needToDraw) {
postInvalidate();
} else {
mRunning = false;
if (mAnimationListener != null) {
mAnimationListener.onAnimationEnd(this);
}
}
}
/**
* Use interpolator to get t
*
* @return
*/
private float interpolate() {
long currTime = System.currentTimeMillis();
float elapsed = (currTime - startTime) / ZOOM_TIME;
elapsed = Math.min(1f, elapsed);
return interpolator.getInterpolation(elapsed);
}