Got ArrayIndexOutOfBoundsException when scrolling RecyclerView with GridLayoutManager

Question

I am using RecyclerView (com.android.support:recyclerview-v7:21.0.2) with GridLayoutManager and applying dynamic column count. When the view is scrolled an exception is thrown. It seems the error happens when the RecyclerView about to display items that were not displayed previously (reusing or rebinding). However, if I don't use such dynamic span/column count or simply comment the line calling GridLayoutManager.setSpanCount, it does not happen.

I've tried to inspect the source code, it seems the problem is related to a temporary array mSet.

E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.ArrayIndexOutOfBoundsException
            at android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:361)
            at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1269)
            at android.support.v7.widget.LinearLayoutManager.scrollBy(LinearLayoutManager.java:1097)
            at android.support.v7.widget.LinearLayoutManager.scrollVerticallyBy(LinearLayoutManager.java:957)
            at android.support.v7.widget.RecyclerView.scrollByInternal(RecyclerView.java:985)
            at android.support.v7.widget.RecyclerView.onTouchEvent(RecyclerView.java:1686)
            at android.view.View.dispatchTouchEvent(View.java:3885)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:903)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
            at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
            at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
            at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
            at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
            at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:123)
            at android.app.ActivityThread.main(ActivityThread.java:3683)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:507)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
            at dalvik.system.NativeStart.main(Native Method)

How to solve this so that I can have a grid with dynamic span count? Thank you.

score 1 · Answer 1 · answered Feb 27 '15 at 15:30

1

My workaround for this issue is to adjust the mSet size. Did it by extending GridLayoutManager.

package android.support.v7.widget;


import android.content.Context;
import android.view.View;

public class MyGridLayoutManager extends GridLayoutManager {
    public MyGridLayoutManager(Context context, int spanCount) {
        super(context, spanCount);
    }

    public MyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) {
        super(context, spanCount, orientation, reverseLayout);
    }

    @Override
    public void setSpanCount(int spanCount) {
        super.setSpanCount(spanCount);
        if (mSet != null && mSet.length != spanCount) {
            View[] newSet = new View[spanCount];
            System.arraycopy(mSet, 0, newSet, 0, Math.min(mSet.length, spanCount));
            mSet = newSet;
        }
    }
}

answered Feb 27 '15 at 15:30

ulcica

478
5
15

It has been so long, but this solution is worth to try in the future. Thank you. – fikr4n Feb 27 '15 at 23:14
Doesn´t work because mSet is package local and can´t be accessed from outside the package – Marian Klühspies Jan 10 '17 at 21:06
@MarianKlühspies, there is no problem with putting the child class in the package `android.support.v7.widget`. Try it out! It works ;) – ulcica Jan 11 '17 at 09:28
Do you actually know, why this happens? In my case it is because of native ads, but only sometimes, if the internet connection is very bad – Marian Klühspies Jan 11 '17 at 09:44

Got ArrayIndexOutOfBoundsException when scrolling RecyclerView with GridLayoutManager

1 Answers1