Correct way to close android app

[overtired]

Hello! I met a problem with using ogre in a separate activity inside android application. When I collapse android application, then restore it, I got the error

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/ogre/OgreMain/include/OgreSingleton.h:76: Ogre::Singleton<Ogre::Root>::Singleton() [T = Ogre::Root]: assertion "(!msSingleton) && ("There can be only one singleton")" failed'

I call OgreContext::initAppForAndroid() when open create the activity with ogre and call OgreContext::shutdown() on activity destroy. The Sample app reproduce the same same issue.

Which is the correct way to finish work with ogre? Am I should call initAppForAndroid() only once? And, if true, how cam I check is it initialized?

[paroj]

you have to call closeApp() instead of shutdown() - similarly to how initApp() calls setup()

[overtired]

I tried to call closeApp(), but I lead to another error, I made the log below from the sample

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2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: Build fingerprint: 'google/marlin/marlin:8.1.0/OPM4.171019.021.P1/4820305:user/release-keys'
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: Revision: '0'
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: ABI: 'arm'
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: pid: 2528, tid: 2528, name: mples.c.helloar  >>> com.google.ar.core.examples.c.helloar <<<
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x12
2019-01-22 13:36:23.119 2595-2595/? A/DEBUG: Cause: null pointer dereference
2019-01-22 13:36:23.120 2595-2595/? A/DEBUG:     r0 cfdf27f4  r1 00000012  r2 00000000  r3 00000000
2019-01-22 13:36:23.120 2595-2595/? A/DEBUG:     r4 cf590b20  r5 00000012  r6 cfdf27f8  r7 ff9dc6c8
2019-01-22 13:36:23.120 2595-2595/? A/DEBUG:     r8 cfdf27f8  r9 cf58c0c0  sl dedc1940  fp ff9dc804
2019-01-22 13:36:23.120 2595-2595/? A/DEBUG:     ip 0000006d  sp ff9dc6b8  lr cfb0b77d  pc cfb0c56a  cpsr 60010030
2019-01-22 13:36:23.125 2595-2595/? A/DEBUG: backtrace:
2019-01-22 13:36:23.125 2595-2595/? A/DEBUG:     #00 pc 004c956a  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.125 2595-2595/? A/DEBUG:     #01 pc 004c8779  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.125 2595-2595/? A/DEBUG:     #02 pc 004c87f5  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.125 2595-2595/? A/DEBUG:     #03 pc 003813a3  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.126 2595-2595/? A/DEBUG:     #04 pc 00381455  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.126 2595-2595/? A/DEBUG:     #05 pc 0043b693  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.126 2595-2595/? A/DEBUG:     #06 pc 0030264b  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so
2019-01-22 13:36:23.126 2595-2595/? A/DEBUG:     #07 pc 002efd05  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/lib/arm/libOgreJNI.so (Java_org_Ogre_OgreBitesJNI_ApplicationContext_1closeApp+12)
2019-01-22 13:36:23.127 2595-2595/? A/DEBUG:     #08 pc 000109a3  /data/app/com.google.ar.core.examples.c.helloar-suvNkJivUP6bp_cKhVXrWA==/oat/arm/base.odex (offset 0x10000)

[paroj]

yeah.. I just noticed that our samples actually never call closeApp(), so that code is untested. Will take me some time to look at.

Alternatively you can do what the SampleBrowser does to detect whether the app is already running:
https://github.com/OGRECave/ogre/blob/m ... oid.h#L108