Hi Everyone,
I have an issue where (*env)->CallStaticVoidMethod is crashing. I am
caching the jvm, class and method id on JNI_OnLoad. In JNI_OnLoad i
start a thread! in that thread I want to call back a java method which
I am having problems with. Also should I be using JNI_VERSION_1_2 or
JNI_VERSION_1_4?
JavaVM *cached_jvm;
jclass Class_C;
jmethodID MID_C_callback;
JNIEXPORT jint JNICALL
JNI_OnLoad(JavaVM *jvm, void *reserved)
{
__android_log_print(ANDROID_LOG_DEBUG, "JNI_OnLoad",
"JNI_OnLoad - start");
JNIEnv *env;
jclass cls;
// cache the jvm
cached_jvm = jvm;
if ((*jvm)->GetEnv(jvm, (void **)&env, JNI_VERSION_1_2)) {
__android_log_print(ANDROID_LOG_DEBUG, "JNI_OnLoad",
"ERROR: GetEnv failed ");
return JNI_ERR; // JNI version not supported;
}
cls = (*env)->FindClass(env,
"com/bla/bla/xxxActivity");
if (cls == NULL) {
__android_log_print(ANDROID_LOG_DEBUG, "JNI_OnLoad",
"ERROR: FindClass failed");
return JNI_ERR;
}
/* Use weak global ref to allow C class to be unloaded */
Class_C = (*env)->NewWeakGlobalRef(env, cls);
if (Class_C == NULL) {
__android_log_print(ANDROID_LOG_DEBUG, "JNI_OnLoad",
"ERROR; NewWeakGlobalRef failed ");
return JNI_ERR;
}
/* Compute and cache the method ID */
MID_C_callback = (*env)->GetStaticMethodID(env, cls, "callback",
"()V");
if (MID_C_callback == NULL) {
__android_log_print(ANDROID_LOG_DEBUG, "JNI_OnLoad",
"ERROR:GetStaticMethod failed
");
return JNI_ERR;
}
startMyThread();
return JNI_VERSION_1_2;
}
void startMyThread()
{
pthread_t myThread;
int rc;
rc = pthread_create(&myThread, NULL, (void *) &workerFunction, NULL);
if (rc) {
__android_log_print(ANDROID_LOG_DEBUG, GENERAL_LOG,
"ERROR starting pulse detection thread ");
}
}
static void workerFunction()
{
JNIEnv *env;
int status = (*cached_jvm)->AttachCurrentThread(cached_jvm, &env,
NULL);
// status is 0 which means success
(*env)->CallStaticVoidMethod(env, Class_C, MID_C_callback); //
this crashes
}
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