An exception , Animators may only be run on Looper threads

[0xByteLeon]

<io.reactivex.exceptions.OnErrorNotImplementedException: Animators may only be run on Looper threads at io.reactivex.internal.functions.Functions$14.accept(Functions.java:229) at io.reactivex.internal.functions.Functions$14.accept(Functions.java:226) at io.reactivex.internal.observers.LambdaObserver.onError(LambdaObserver.java:72) at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:62) at io.reactivex.observers.SerializedObserver.onNext(SerializedObserver.java:111) at io.reactivex.internal.operators.observable.ObservableDelay$DelayObserver$1.run(ObservableDelay.java:84) at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:59) at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:51) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:154) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818) Caused by: android.util.AndroidRuntimeException: Animators may only be run on Looper threads at android.animation.ValueAnimator.start(ValueAnimator.java:1069) at android.animation.ValueAnimator.start(ValueAnimator.java:1117) at cn.bingoogolapple.refreshlayout.BGARefreshLayout.changeRefreshHeaderViewToZero(BGARefreshLayout.java:770) at cn.bingoogolapple.refreshlayout.BGARefreshLayout.beginRefreshing(BGARefreshLayout.java:723) at com.proton.carepatchecg.fragment.MsgFragment.lambda$setBgaRefreshLayout$1(MsgFragment.java:163) at com.proton.carepatchecg.fragment.MsgFragment$$Lambda$4.accept(Unknown Source) at io.reactivex.internal.observers.LambdaObserver.onNext(LambdaObserver.java:59) at io.reactivex.observers.SerializedObserver.onNext(SerializedObserver.java:111)  at io.reactivex.internal.operators.observable.ObservableDelay$DelayObserver$1.run(ObservableDelay.java:84)  at io.reactivex.internal.schedulers.ScheduledRunnable.run(ScheduledRunnable.java:59)  at io.reactivex.internal.schedulers.ScheduledRunnable.call(ScheduledRunnable.java:51)  at java.util.concurrent.FutureTask.run(FutureTask.java:237)  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:154)  at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:269)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)  at java.lang.Thread.run(Thread.java:818) >

[JakeWharton]

Your starting an animation in doOnNext that isn't running on the main thread. This has nothing to do with RxAndroid and is instead a programming error. Ensure that when you are touching the UI in a side-effect of your stream that you are observing events on the main thread. You need to have observeOn(mainThread()) before your side-effect operators.

[JakeWharton]

If you want to create a sample we can show you how to fix it, but it's not a bug in this library and GitHub issues are for bugs and feature requests and not discussion or help. StackOverflow is a much better forum for those.

[0xByteLeon]

Thanks! But I don't know why,
this is normally code ：
<Observable.just(1) .delay(1, TimeUnit.SECONDS) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(integer -> mBgaMsg.beginRefreshing());>

this is wrong code :
< Observable.just(1) .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .delay(1, TimeUnit.SECONDS) .subscribe(integer -> mBgaMsg.beginRefreshing());>

I can't understand !

[JakeWharton]

Drop observeOn and use delay(1, SECONDS, mainThread())

[JakeWharton]

The documentation for delay speaks about how it uses the computation() scheduler by default

[0xByteLeon]

Thanks!