java.lang.NullPointerException: Attempt to invoke virtual method 'int android.support.v7.widget.OrientationHelper.getMode()' on a null object reference about viewpagerlayoutmanager HOT 8 CLOSED

Finally reappear this error..I think I can fix it today

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duplicate #25 , This error confuse me either, It seems like it has something to do with the version of RecyclerView, You may change the version into 26.0.1. Because I can not reappear this error, So I still not quite sure why it happens.

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I found that the error doesnt appear if I add this:

GravitySnapHelper snapHelper = new GravitySnapHelper(Gravity.START);
snapHelper.attachToRecyclerView(mRecyclerView);

from this lib
https://github.com/rubensousa/RecyclerViewSnap

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But if I set this, the error appears again

LinearSnapHelper snapHelper = new LinearSnapHelper();
snapHelper.attachToRecyclerView(mRecyclerView);

WTF?

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what is your gradle build tools version?

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 androidBuildToolsVersion = "26.0.2"
 androidMinSdkVersion = 19
 androidTargetSdkVersion = 23
 androidCompileSdkVersion = 25
 supportLibVer = '25.4.0'
compileOnly "com.android.support:recyclerview-v7:${supportLibVer }"

My customer doest want to update this versions

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Fixed by : 8c4acfa. Try version 2.0.3.
It because LinearLayoutManager below 26.0.0 did not call ensureLayoutState before updateLayoutState in method collectAdjacentPrefetchPositions. Cause I don't need to prefetch items, so I just simply disable it.

I find that GravitySnapHelper use api "com.android.support:recyclerview-v7:27.0.2" in its gradle build file. So maybe when you set it, recyclerview-27.0.2 is the one you use.

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Fixed!

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