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Crash at C++ line: CallObjectMethod(...);

Bold line below was working fine in 4.15. However, this line is crashing in 4.20:


JNIEnv* env = FAndroidApplication::GetJavaEnv();

jobject activity = FAndroidApplication::GetGameActivityThis();

jmethodID mid = env->GetMethodID(env->GetObjectClass(activity), "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;");

jobject wifi_manager = env->CallObjectMethod(activity, mid, env->NewStringUTF("wifi"));


What is wrong with this line and how can I fix this?

Product Version: UE 4.20
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asked Sep 30 '18 at 02:23 PM in C++ Programming

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SalihBalkan
429 16 29 58

avatar image Firefly74 Oct 01 '18 at 11:49 AM

More infos are needed, like what kind of crash ? Are any objects null in those you show/ use here ? do you have a stack trace that is usefull ?

avatar image SalihBalkan Oct 09 '18 at 01:07 PM

Only useless android.bat logs and this. I found the crashing line by putting UE_LOG to each line of the code. Bold line is crashing.

avatar image Shadowriver Oct 01 '18 at 12:16 PM

Did you do modifications in ProGuard config?

avatar image SalihBalkan Oct 09 '18 at 01:07 PM

I didn't change anything since 4.15.

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2 answers: sort voted first

This was because of missing runtime permission. You can search for the relevant permission by searching 'permission' in monitor bat logs. Since mandatory runtime permission to get a static device id, we had to switch to dynamic device id that may change at reinstall, proved by 'Get Device Identifier' node.

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answered Jan 04 '19 at 05:18 AM

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SalihBalkan
429 16 29 58

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try to add as much debug line as you can, like :

 if(!env)
     UE_LOG("envNULL");

i've never used jmethodID nor jobject, but check their validity too with a log, could give more idea why it's crashing :/

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answered Oct 09 '18 at 01:23 PM

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Firefly74
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