Code crashed if only empty ExpandableLayout added to xml

[ivankarpey]

I have markup which looks like:

<com.github.aakira.expandablelayout.ExpandableLinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/placeholder"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <!--<TextView xmlns:android="http://schemas.android.com/apk/res/android"-->
            <!--android:id="@+id/tv7778"-->
            <!--android:layout_width="match_parent"-->
            <!--android:layout_height="@dimen/input_height"-->
            <!--android:background="@drawable/border11_bottom"-->
            <!--android:gravity="center_vertical"-->
            <!--android:text="WE NEVER FORGET WE NEVER FORGIVE"/>-->

    </com.github.aakira.expandablelayout.ExpandableLinearLayout>

and if I comment textview in the middle it's fails with:

E/AndroidRuntime: FATAL EXCEPTION: main
                  Process: io.test PID: 3618
                  java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
                      at java.util.ArrayList.get(ArrayList.java:310)
                      at com.github.aakira.expandablelayout.ExpandableLinearLayout.onMeasure(ExpandableLinearLayout.java:126)
                      at android.view.View.measure(View.java:18788)
                      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
                      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
                      at android.view.View.measure(View.java:18788)
                      at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
                      at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
                      at android.view.View.measure(View.java:18788)
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
                      at android.view.View.measure(View.java:18788)
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
                      at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
                      at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
                      at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
                      at android.view.View.measure(View.java:18788)
                      at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
                      at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
                      at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
                      at android.view.View.measure(View.java:18788)
                      at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)
                      at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)
                      at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)
                      at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
                      at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
                      at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
                      at android.view.Choreographer.doCallbacks(Choreographer.java:670)
                      at android.view.Choreographer.doFrame(Choreographer.java:606)
                      at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
                      at android.os.Handler.handleCallback(Handler.java:739)
                      at android.os.Handler.dispatchMessage(Handler.java:95)
                      at android.os.Looper.loop(Looper.java:148)
                      at android.app.ActivityThread.main(ActivityThread.java:5417)
                      at java.lang.reflect.Method.invoke(Native Method)
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

[ivankarpey]

the problem is in this line:

https://github.com/AAkira/ExpandableLayout/blob/master/library/src/main/java/com/github/aakira/expandablelayout/ExpandableLinearLayout.java#L126

You consider that array will have elements and not checking case when it could be empty. So trying ti get item with -1 index.

[AAkira]

@ivankarpey

Thanks a bunch! :-)
I fixed on v1.6.0