在这里记录了一下 JNI 的动态注册,研究了好长时间,总算是写出来一份可以提供给 java 层调用的jni方法了

#include <jni.h>
#include <string>
#include <android/log.h>

#define TAG "tian.shm"

#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,TAG,__VA_ARGS__);
jint native_tsm_player_prepare(JNIEnv * env,jobject obj,jstring source) {
  LOGI("-------native_tsm_player_prepare---------source:%s",env->GetStringUTFChars(source,NULL))
  return 0;
}
void native_tsm_player_start(JNIEnv * env,jobject obj) {
  LOGI("-------native_tsm_player_start---------")
}
void native_tsm_player_stop(JNIEnv * env,jobject obj) {
  LOGI("-------native_tsm_player_stop---------")
}
void native_tsm_player_release(JNIEnv * env,jobject obj) {
  LOGI("-------native_tsm_player_release---------")
}
JNINativeMethod method []= {
      {
              "nativePrepare",
              "(Ljava/lang/String;)I",
              (jint *)native_tsm_player_prepare
      },
      {
              "nativeRelease",
              "()V",
              (void *)native_tsm_player_release
      },
      {
              "nativeStop",
              "()V",
              (void *)native_tsm_player_stop
      },
      {
              "nativeStart",
              "()V",
              (void *)native_tsm_player_start
      }
};


int JNI_OnLoad(JavaVM
             *vm,
             void *unused
) {
  JNIEnv *env;
  int env_result = vm->GetEnv(reinterpret_cast<void **>(&env), JNI_VERSION_1_6);
  if (env_result != JNI_OK) {
      return JNI_FALSE;
  }
  jclass cls = env->FindClass("com/example/tsmplayer/TsmPlayer");

  env->RegisterNatives(cls, method, sizeof(method) / sizeof(JNINativeMethod));


  return JNI_VERSION_1_6;
}