Screen rotation resets intro slides in splash screen demo

[Sleeper9]

Whenever I rotate the screen during the intro slides, the intro starts again at the initial position. I follow the example code and add my slides in onCreate(). I tried to wrap the code into a
if (null == savedInstanceState) { ... }, but then I get an exception:

java.lang.IndexOutOfBoundsException: Invalid index 2, size is 0
 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2689)
 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2754)
 android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:4458)
 android.app.ActivityThread.access$1000(ActivityThread.java:177)
 android.app.ActivityThread$H.handleMessage(ActivityThread.java:1454)
 android.os.Handler.dispatchMessage(Handler.java:102)
 android.os.Looper.loop(Looper.java:145)
 android.app.ActivityThread.main(ActivityThread.java:5938)
 java.lang.reflect.Method.invoke(Native Method)
 java.lang.reflect.Method.invoke(Method.java:372)
 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1400)
 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1195)
by: java.lang.IndexOutOfBoundsException: Invalid index 2, size is 0
 java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
 java.util.ArrayList.get(ArrayList.java:308)
 com.heinrichreimersoftware.materialintro.slide.SlideAdapter.getBackground(SlideAdapter.java:93)
 com.heinrichreimersoftware.materialintro.app.IntroActivity.getBackground(IntroActivity.java:752)
 com.heinrichreimersoftware.materialintro.app.IntroActivity.updateBackground(IntroActivity.java:367)
 com.heinrichreimersoftware.materialintro.app.IntroActivity.onPostCreate(IntroActivity.java:125)

[janheinrichmerker]

Can't confirm this on material-intro 1.5.1 running Nexus 5X Android N

[Sleeper9]

I just checked out the latest master and this problem appears on Nexus 7 @ Android 6.0.1 (and other lower API levels like 5.0, 4.x as well). Here is a sample gif recording of the Fake splash screen functionality; I rotate the screen two times and pressing the device Back button several times then. You
can see that the "older" intro screens are still there after I finish a rotated one.

[janheinrichmerker]

Yep this is most likely a problem with the splash screen demo as this issue doesn't occur when starting an intro manually e.g. when pressing "Start intro" in the demo.

[Sleeper9]

Ah, I see, indeed. But I found another strange thing: the Get started button and the page indicator dots disappear in the "Start intro" demo if you rotate the device any slide other than the first and does not appear again until you go back to the first slide and rotate again.

[janheinrichmerker]

We should have another issue for that