Animation not working while loading from XML in Android

Question

I am trying to do some animation inside ViewPager2 with Fragments.

But the problem is when I load the animation from XML, it is working for the first time. After swiping left/right in ViewPager and going back to the same page that animation is not working.

Below is the XML anim

<?xml version="1.0" encoding="UTF-8"?>
<rotate
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:fromDegrees="0"
    android:toDegrees="360"
    android:pivotX="50%"
    android:pivotY="50%"
    android:repeatCount="infinite"
    android:interpolator="@android:anim/linear_interpolator"
    android:duration="4000" />

Below is the code which I used to load the animation inside Fragment

Animation rotate = AnimationUtils.loadAnimation(getContext(), R.anim.rotate);
view.startAnimation(rotate);

I have also done some animation without loading from XML, it was working perfectly fine. That problem only occurs when I load the animation from XML.

No @Prashant.J, I am calling startAnimation() inside onCreateView() — vijay raghavan, Apr 13 '20 at 18:31
Have you checked by adding your animation code inside onPageSelected() ? — Prashant.J, Apr 13 '20 at 18:40
@Prashant.J, How can I access Fragment's view inside onPageSelected() ? — vijay raghavan, Apr 13 '20 at 19:14

Prashant.J · Answer 1 · 2020-04-13T18:40:00.010

0

Try using repetition on your animation object.

rotate.setRepeatCount(Animation.INFINITE);

OR

(Animation.RESTRT)

OR setInterpolator() on animation

Write your animation code inside onPageSelected()

View pager OnPageChangeListener

edited Apr 13 '20 at 18:40

answered Apr 13 '20 at 18:29

Prashant.J

739
7
12

I have set the ```android:repeatCount="infinite"``` inside XML. – vijay raghavan Apr 13 '20 at 18:33

score 0 · Answer 2 · answered Apr 13 '20 at 18:49

0

You are calling startAnimation() inside onCreateView() at that point view is just getting created but not visible on screen that is why the animation is not getting started call startAnimation() inside onStart();

@Override
public void onStart() {
    super.onStart();
    Animation rotate = AnimationUtils.loadAnimation(getContext(), R.anim.rotate);
    view.startAnimation(rotate);
}

answered Apr 13 '20 at 18:49

Rahul Samaddar

244
2
8

I am using FragmentStateAdapter for ViewPager Adapter, which is not calling onStart() when I need focus in that fragment after swipe left/right. So, adding ```startAnimation()``` inside ```onResume()``` fixed my issue. – vijay raghavan Apr 13 '20 at 19:10

Animation not working while loading from XML in Android

2 Answers2