JNI|在子线程中获得JNIEnv|AttachCurrentThread
16lz
2021-01-26
A JNI interface pointer (JNIEnv*) is passed as an argument for each native function mapped to a Java method, allowing for interaction with the JNI environment within the native method.This JNI interface pointer can be stored, but remains valid only in the current thread. Other threads must first call AttachCurrentThread()to attach themselves to the VM and obtain a JNI interface pointer. Once attached, a native thread works like a regular Java thread running within a native method. The native thread remains attached to the VM until it callsDetachCurrentThread() to detach itself.[3]
[cpp] view plain copy
- void Call_Back_Invoke( void *user,int notify_id, unsigned int param )
- {
- bool isAttacked = false;
- JNIEnv* env;
- if(NULL == jni_tmpc.g_JVM)
- {
- LOGE("g_JVM == NULL");
- return ;
- }
- int status = (jni_tmpc.g_JVM)->GetEnv((void **) &env, jni_tmpc.g_JNI_VERSION);
- if(status < 0) {
- LOGD("callback_handler:failed to get JNI environment assuming native thread");
- status = jni_tmpc.g_JVM->AttachCurrentThread(&env, NULL);
- if(status < 0) {
- LOGE("callback_handler: failed to attach current thread");
- return;
- }
- isAttacked = true;
- }
- switch( notify_id )
- {
- case...
- ...
- }
- if(isAttacked)
- {
- (jni_tmpc.g_JVM)->DetachCurrentThread();
- }
- LOGE("jni Call_Back_Invoke(1) notify_id = %d",notify_id );
- }
更多相关文章
- 代码中设置drawableleft
- android 3.0 隐藏 系统标题栏
- Android开发中activity切换动画的实现
- Android(安卓)学习 笔记_05. 文件下载
- Android中直播视频技术探究之—摄像头Camera视频源数据采集解析
- 技术博客汇总
- android 2.3 wifi (一)
- AndRoid Notification的清空和修改
- Android中的Chronometer