[android-developers] multicast permission of dalvik and how to attach to dalvik env?
Hi all,
1. I have a c lib which will send & receive multicast package, if I
lauch it in native ap, everything is OK, but if lauched through jni ,so it
run in
dalvik env, it can not receive multicast, i think is may be disabled by
dalvik, is there any permission can enable this feature?
2. In this lib i will make some callback of function in dalvik class.
according to tranditional method which can run under JDK1.5 & 1.6
as follow: (I make it under source code env not NDK)
In some initialization method save jvm pointer
*int nRt = env->GetJavaVM(&jvm);*
some callback func in lib:
* **nResult = jvm->AttachCurrentThread((void **)&env, NULL);*
*
*
* **if ((nResult != 0) || (env == NULL))*
* **{*
* **return;*
* **}*
*
*
* **jstring res = env->NewStringUTF(srvName); // failed*
*jclass cls = env->FindClass("com/xxx/ooo/ServerList");*
* ...*
*
*
*jvm->DetachCurrentThread();*
it seems AttachCurrentThread not failed but env not correct.
Regards,
Caval.
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[android-developers] Re: JNI callback problem
Thanks for your tip, but the options does not work.may be I should check
android JNI spec firstly.
2009/9/16 fadden
>
> (1) This discussion should be on android-ndk.
> (2) Make sure you have CheckJNI enabled (setprop dalvik.vm.checkjni
> true) if you're not on the emulator.
> (3) The logcat output will have some information about the crash that
> you should include.
>
>
> On Sep 15, 3:33 am, caval wrote:
> > firstly I save JVM pointer in a native function which called when ap
> > lauched:
> > JNIEXPORT void JNICALL Java_com_caval_ServerList_Init
> > (JNIEnv * env, jobject obj)
> > {
> > ...
> >
> > *// save jvm pointer*
> > * **int nRt = env->GetJavaVM(&jvm);*
> >
> > if (nRt == 0)
> > fprintf(stdout, "InitDLNACP --> GetJavaVM Success...\n");
> > else
> > fprintf(stderr, "InitDLNACP --> GetJavaVM Failed...\n");
> >
> > }
> >
> > then, when some event echoed I will make a callback of some class in jvm
> >
> > void _callback()
> > {
> > JNIEnv *env = NULL;
> > int nResult = -1;
> >
> > *nResult = jvm->AttachCurrentThread((void **)&env, NULL);*
> > *if ((nResult != 0) || (env == NULL))*
> > {
> > fprintf(stderr, "--> In _Java_com_caval_now_Map_AddItem Thread Attached
> > Failed.\n");
> > return;
> >
> > }
> >
> > jstring ret = env->NewStringUTF(pszTitle); // I run to this line and ap
> > crashed.
> > jclass cls = env->FindClass("com/caval/now/ServerList");
> >
> > }
> >
> > the AttachCurrentThread func return OK and also I get the env pointer.
> > but any call on env will crash.
> >
> > I have no idea of this issue...any help will highly appriciated.
> >
> > Regards,
> > Caval.
> >
>
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[android-developers] JNI callback problem
firstly I save JVM pointer in a native function which called when ap
lauched:
JNIEXPORT void JNICALL Java_com_caval_ServerList_Init
(JNIEnv * env, jobject obj)
{
...
*// save jvm pointer*
* **int nRt = env->GetJavaVM(&jvm);*
if (nRt == 0)
fprintf(stdout, "InitDLNACP --> GetJavaVM Success...\n");
else
fprintf(stderr, "InitDLNACP --> GetJavaVM Failed...\n");
}
then, when some event echoed I will make a callback of some class in jvm
void _callback()
{
JNIEnv *env = NULL;
int nResult = -1;
*nResult = jvm->AttachCurrentThread((void **)&env, NULL);*
*if ((nResult != 0) || (env == NULL))*
{
fprintf(stderr, "--> In _Java_com_caval_now_Map_AddItem Thread Attached
Failed.\n");
return;
}
jstring ret = env->NewStringUTF(pszTitle); // I run to this line and ap
crashed.
jclass cls = env->FindClass("com/caval/now/ServerList");
}
the AttachCurrentThread func return OK and also I get the env pointer.
but any call on env will crash.
I have no idea of this issue...any help will highly appriciated.
Regards,
Caval.
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[android-developers] Re: Catching memory exception
Firstly you can enter into the shell mode by typing "adb shell"then because android has a linux heart so you can type "ps" to see all process's status which also including mem info. Regards, Caval. 2009/8/5 whitech > > Oh so sorry to hear that > Thank you. > There's another problem, is there some way to know how many memory my > program is using ? > > On 8月4日, 下午6时39分, Mark Murphy wrote: > > whitechwrote: > > > There is another problem, can I push the limit of memory higher? It is > > > a little too small with only 16 MB > > > > Not without changing the firmware. > > > > -- > > Mark Murphy (a Commons Guy)http://commonsware.com| > http://twitter.com/commonsguy > > > > Android Training in Germany, 18-22 January 2010:http://bignerdranch.com > > > --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~--~~~~--~~--~--~---
