Android JNI uses jnienv across threads

Source: Internet
Author: User

When you pass Env->callstaticvoidmethod to callback in JNI, you always hang up.

The reason is that jnienv is thread-dependent and can only be used in the corresponding created thread

The JVM is process-dependent and can be used by the JVM to get thread-related jnienv.

Initialize as follows

static void

Com_test_player_native_init (jnienv *env)


Jclass Clazz;

Clazz = Env->findclass ("Com/test/player");

if (clazz = = NULL) {



Fields.post_event = Env->getstaticmethodid (Clazz, "postevent",

"(Ljava/lang/object;iiiljava/lang/object;) V");

if (fields.post_event = = NULL) {



Set the virtual machine.



Using env

void postevent (int msg)


JNIEnv *env;

Fields.pjvm->attachcurrentthread (&env, NULL);

Env->callstaticvoidmethod (MClass, fields.post_event, Mobject, msg);

Fields.pjvm->detachcurrentthread ();


Android JNI uses jnienv across threads

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.