Crash(NullPointerException) if padding is added to SwipeListView

[mateusgrb]

If I add padding to the SwipeListView in XML, I get a crash.

Example:

<com.fortysevendeg.swipelistview.SwipeListView
    android:id="@+id/fragment_contacts_list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingBottom="30dp"
    android:paddingTop="30dp"
    swipe:swipeBackView="@+id/list_item_contacts_back"
    swipe:swipeFrontView="@+id/list_item_contacts_front"
    swipe:swipeOpenOnLongPress="false" />

Steps to reproduce:
1-Add some padding to your SwipeListView
2-Scroll your list, swipe an item and scroll again. Keep playing around with that and the app quickly crashes.

Stack Trace:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.view.ViewPropertyAnimator android.view.View.animate()' on a null object reference
at com.nineoldandroids.view.ViewPropertyAnimatorICS.(ViewPropertyAnimatorICS.java:22)
at com.nineoldandroids.view.ViewPropertyAnimator.animate(ViewPropertyAnimator.java:62)
at com.fortysevendeg.swipelistview.SwipeListViewTouchListener.generateRevealAnimate(SwipeListViewTouchListener.java:644)
at com.fortysevendeg.swipelistview.SwipeListViewTouchListener.closeAnimate(SwipeListViewTouchListener.java:527)
at com.fortysevendeg.swipelistview.SwipeListViewTouchListener.closeOpenedItems(SwipeListViewTouchListener.java:783)
at com.fortysevendeg.swipelistview.SwipeListViewTouchListener$7.onScrollStateChanged(SwipeListViewTouchListener.java:723)
at android.support.v7.widget.RecyclerView.dispatchOnScrollStateChanged(RecyclerView.java:3841)
at android.support.v7.widget.RecyclerView.setScrollState(RecyclerView.java:1141)
at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:2339)
at android.view.View.dispatchTouchEvent(View.java:8471)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2399)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2092)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2405)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2106)
at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2369)
at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1719)
at android.app.Activity.dispatchTouchEvent(Activity.java:2742)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at android.support.v7.internal.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:60)
at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2330)
at android.view.View.dispatchPointerEvent(View.java:8666)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4123)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3989)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3544)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3597)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3563)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3680

[mateusgrb]

I found out the crash happens because I'm using different item view types in the list and one of them(not supposed to be swiped) doesn't have a view called R.id.list_item_contacts_front.

Anyway, the root of the crash is that the padding added to the recyclerview tricks it into thinking that some items are not visible anymore when they are technically still on the screen(hidden by the padding). So the getChildAt inside closeOpenedItems gets the wrong element to close.