NullPointerException requestDisallowInterceptTouchEvent(boolean)

[fkirc]

I am not sure why this is happening, and it seems to appear pretty random.
I use a custom onTouchListener on the SubsamplingScaleImageView to detect swipe gestures and a ViewAnimator to create swipe animations between images.

FATAL EXCEPTION: main
PID: 31476
java.lang.NullPointerException: Attempt to invoke interface method 'void android.view.ViewParent.requestDisallowInterceptTouchEvent(boolean)' on a null object reference
at com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView.onTouchEvent(SubsamplingScaleImageView.java:591)
at android.view.View.dispatchTouchEvent(View.java:9377)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2255)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2554) ......

[davemorrissey]

Which version of the library are you using? There's nothing on line 591 in the current version.

[fkirc]

I am using 'com.davemorrissey.labs:subsampling-scale-image-view:3.5.0'

[davemorrissey]

I think what must have happened is the view is detached from its parent when this happens. It it's still on screen I'm not sure how that can happen. To stop the exception being thrown I've added some null safety.

[fkirc]

Thanks I think this should fix the issue