Android NDK Callbacks to Java Activity -



Android NDK Callbacks to Java Activity -

i'm porting application of mine bulk of work done within native part of application , java side purely ui.

what i'm trying implement @ moment progressbar show status of native thread's operation. ui consists of different activities , i'm intending display progressbars activities.

the question is: how do it? have native code follows:

jclass clazz = emv->findclass( "com/example/myapp/mainactivity" );

that returns null clazz. realised no mainactivity activity beingness displayed @ time - instance of settingsactivity, tried changing above line accordingly still returned null.

is not possible phone call findclass() native code retrieve activity class?

ultimately think need phone call method such below:

public void progressupdatefromnative( int ) { runonuithread( new runnable() { @override public void run() { displayprogressupdate(); } } ); }

..and method within 1 of activities.

jmethodid progressupdatefromnative = env->getmethodid( clazz, "progressupdatefromnative", "(i)v"); env->callobjectmethod( g_pobj, progressupdatefromnative, 1 ) ;

i have retrieved javavm pointer onload() jni phone call , called javavm->attachcurrentthread() retrieve env pointer used above.

can please tell me i'm missing - ie -why getting null class returned findclass, or set me on different track if doing wrong. intended read on handlers don't think far through in understanding yet.

note: realise poll native variables java ui prefer callback/event handling implementation rather polling.

if code not invoked java method utilize scheme classloader in findclass() knows android scheme classes.

i suggest using getting reference class in jni_onload, creating global reference via newglobalref , passing threads or storing in global variable.

more info behavior: http://markmail.org/message/25rrwp4va443rjuk#query:+page:1+mid:2u5wlkjyugwp75qa+state:results

java android callback android-ndk native

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