Fix the problem of playing while switching front and back on the Andr…

…oid platform. (#682)

Make the method of onAnimationStart aligned with the Android platform.

Co-authored-by: kevingpqi <kevingpqi@tencent.com>
(cherry picked from commit 7701614)

android/libpag/src/main/java/org/libpag/PAGView.java

@@ -277,11 +277,11 @@ public void onAnimationStart(Animator animator) {
  @Override
  public void onAnimationEnd(Animator animation) {
  super.onAnimationEnd(animation);
- _isPlaying = false;
  // Align with iOS platform, avoid triggering this method when stopping
  int repeatCount = ((ValueAnimator) animation).getRepeatCount();
  if (repeatCount >= 0 && (animation.getDuration() > 0) &&
  (currentPlayTime / animation.getDuration() > repeatCount)) {
+ _isPlaying = false;
  ArrayList<PAGViewListener> arrayList;
  synchronized (PAGView.this) {
  arrayList = new ArrayList<>(mViewListeners);

src/platform/ios/private/PAGValueAnimator.mm

@@ -178,9 +178,7 @@ - (void)start {
  animatedFraction = static_cast<double>(playTime) / duration;
  lock.unlock();
  [animatorListener onAnimationUpdate];
- if (animatedFraction == 0) {
- [animatorListener onAnimationStart];
- }
+ [animatorListener onAnimationStart];
 }
 
 - (void)stop {