[zeromq-dev] Zyre on Android (JNI)

[Joe McIlvain]

What Utsav says sounds right, but from what little I remember, it was
called `dlopen`.  You need to separately `dlopen` each library yourself
(libsodium, libzmq, czmq, zyre).  I remember having to coax Qt into doing
this correctly.

On Wed, Jan 6, 2016 at 7:07 AM, Utsav Drolia <utsavdrolia at gmail.com> wrote:

> I think you would have to do a “System.loadLibrary()” in the app, for
> every C-library the app refers to.
> Or is that taken care of in the zyre library itself?
>
> Utsav
>
> > On Jan 6, 2016, at 9:20 AM, Arnaud Loonstra <arnaud at sphaero.org> wrote:
> >
> > Ok, I played with android studio a bit. Djeez, these dependencies fill
> > my harddrive faster than I can empty. :S
> >
> > Anyway, just build a simple app and ran it on a emulator:
> > Unfortunately, ZyreTest has stopped
> >
> > It seems it can't find the czmq libs?
> >
> > 01-06 15:15:20.295 1257-1257/org.z25.zyretest I/art: Not late-enabling
> > -Xcheck:jni (already on)
> > 01-06 15:15:20.296 1257-1257/org.z25.zyretest I/art: Late-enabling JIT
> > 01-06 15:15:20.701 1257-1257/org.z25.zyretest I/art: JIT created with
> > code_cache_capacity=2MB compile_threshold=1000
> > 01-06 15:15:23.956 1257-1257/org.z25.zyretest D/AndroidRuntime:
> > Shutting down VM
> > 01-06 15:15:23.996 1257-1257/org.z25.zyretest E/AndroidRuntime: FATAL
> > EXCEPTION: main
> >
> > Process: org.z25.zyretest, PID: 1257
> >
> > java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol
> > "zsys_handler_set" referenced by
> > "/data/app/org.z25.zyretest-1/lib/arm/libzyrejni.so"...
> >                                                                     at
> > java.lang.Runtime.loadLibrary(Runtime.java:372)
> >                                                                     at
> > java.lang.System.loadLibrary(System.java:1076)
> >                                                                     at
> > org.zeromq.zyre.Zyre.<clinit>(Zyre.java:13)
> >                                                                     at
> > org.z25.zyretest.ZyreTest.onCreate(ZyreTest.java:15)
> >                                                                     at
> > android.app.Activity.performCreate(Activity.java:6237)
> >                                                                     at
> >
> android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
> >                                                                     at
> >
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
> >                                                                     at
> > android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
> >                                                                     at
> > android.app.ActivityThread.-wrap11(ActivityThread.java)
> >                                                                     at
> > android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
> >                                                                     at
> > android.os.Handler.dispatchMessage(Handler.java:102)
> >                                                                     at
> > android.os.Looper.loop(Looper.java:148)
> >                                                                     at
> > android.app.ActivityThread.main(ActivityThread.java:5417)
> >                                                                     at
> > java.lang.reflect.Method.invoke(Native Method)
> >                                                                     at
> >
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
> >                                                                     at
> > com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
> > 01-06 15:15:53.015 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 20.768ms
> > 01-06 15:16:49.526 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.354ms
> > 01-06 15:16:54.523 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.210ms
> > 01-06 15:16:58.523 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.207ms
> > 01-06 15:18:08.166 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.199ms
> > 01-06 15:18:11.163 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.218ms
> > 01-06 15:18:17.163 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.194ms
> > 01-06 15:18:19.163 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 10.227ms
> > 01-06 15:19:00.201 1257-1264/org.z25.zyretest W/art: Suspending all
> > threads took: 25.579ms
> >
> > Here's my source:
> >
> > package org.z25.zyretest;
> >
> > import android.support.v7.app.AppCompatActivity;
> > import android.os.Bundle;
> > import org.zeromq.zyre.Zyre;
> >
> > public class ZyreTest extends AppCompatActivity {
> >
> >     public Zyre znode;
> >
> >     @Override
> >     protected void onCreate(Bundle savedInstanceState) {
> >         super.onCreate(savedInstanceState);
> >         setContentView(R.layout.activity_zyre_test);
> >         znode = new Zyre("AndroidTest");
> >         znode.start();
> >     }
> >
> >     @Override
> >     public void onDestroy()
> >     {
> >         super.onDestroy();
> >         znode.stop();
> >     }
> > }
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>
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