chromecast - Android: Crash when setting up media route button -


i'm having pretty same problem android: cast sdk v3 crashing in release build only. key difference project while i'm debugging , on line

castbuttonfactory.setupmediaroutebutton(getapplicationcontext(), mmediaroutebutton); 

i have tried making variables public doesn't anything. full code is

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     mmediaroutebutton = (mediaroutebutton) findviewbyid(r.id.media_route_button);     castbuttonfactory.setupmediaroutebutton(getapplicationcontext(), mmediaroutebutton);      mcastcontext = castcontext.getsharedinstance(this);      mselector = new mediarouteselector.builder()             // these framework-supported intents             .addcontrolcategory(mediacontrolintent.category_live_audio)             .addcontrolcategory(mediacontrolintent.category_live_video)             .addcontrolcategory(mediacontrolintent.category_remote_playback)             .build();     mmediarouter = mediarouter.getinstance(this); } 

also find worth mentioning code worked , can not life of me figure out caused stop working. far can tell stopped working when invalidated cache in android studio. error i'm getting

java.lang.runtimeexception: unable start activity componentinfo{mypackage.package/mypackage.package.mainactivity}: java.lang.illegalstateexception: failed initialize castcontext.     @ android.app.activitythread.performlaunchactivity(activitythread.java:2646)     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2707)     @ android.app.activitythread.-wrap12(activitythread.java)     @ android.app.activitythread$h.handlemessage(activitythread.java:1460)     @ android.os.handler.dispatchmessage(handler.java:102)     @ android.os.looper.loop(looper.java:154)     @ android.app.activitythread.main(activitythread.java:6077)     @ java.lang.reflect.method.invoke(native method)     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:865)     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:755)     caused by: java.lang.illegalstateexception: failed initialize castcontext.     @ com.google.android.gms.cast.framework.castcontext.zzbb(unknown source)     @ com.google.android.gms.cast.framework.castcontext.getsharedinstance(unknown source)     @ com.google.android.gms.cast.framework.castbuttonfactory.setupmediaroutebutton(unknown source)     @ mypackage.package.mainactivity.oncreate(mainactivity.java:51)     @ android.app.activity.performcreate(activity.java:6664)     @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1118)     @ android.app.activitythread.performlaunchactivity(activitythread.java:2599)     @ android.app.activitythread.handlelaunchactivity(activitythread.java:2707)      @ android.app.activitythread.-wrap12(activitythread.java)      @ android.app.activitythread$h.handlemessage(activitythread.java:1460)      @ android.os.handler.dispatchmessage(handler.java:102)      @ android.os.looper.loop(looper.java:154)      @ android.app.activitythread.main(activitythread.java:6077)      @ java.lang.reflect.method.invoke(native method)      @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:865)      @ com.android.internal.os.zygoteinit.main(zygoteinit.java:755)      caused by: java.lang.illegalaccessexception: java.lang.class<mypackage.package.castoptionsprovider> not accessible java.lang.class<com.google.android.gms.cast.framework.castcontext>     @ java.lang.class.newinstance(native method)     @ com.google.android.gms.cast.framework.castcontext.zzbb(unknown source)      @ com.google.android.gms.cast.framework.castcontext.getsharedinstance(unknown source)      @ com.google.android.gms.cast.framework.castbuttonfactory.setupmediaroutebutton(unknown source)      @ mypackage.package.mainactivity.oncreate(mainactivity.java:51)      @ android.app.activity.performcreate(activity.java:6664)      @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1118)      @ android.app.activitythread.performlaunchactivity(activitythread.java:2599)      @ android.app.activitythread.handlelaunchactivity(activitythread.java:2707)      @ android.app.activitythread.-wrap12(activitythread.java)      @ android.app.activitythread$h.handlemessage(activitythread.java:1460)      @ android.os.handler.dispatchmessage(handler.java:102)      @ android.os.looper.loop(looper.java:154)      @ android.app.activitythread.main(activitythread.java:6077)      @ java.lang.reflect.method.invoke(native method)      @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:865)      @ com.android.internal.os.zygoteinit.main(zygoteinit.java:755)  

if happening in release buildtype related proguard. please add castoptionsprovider class proguard file , recheck

-keep class abc.xyz.videocast.castoptionsprovider { *; } 

for more safety these classes can added

-keep class android.support.** { *; } -keep class com.google.** { *; } 

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