package com.example.jni_thread_demo;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
public class JNI_ThreadActivity extends Activity {
  private Button mButton = null;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_jni__thread);
    mButton = (Button)findViewById(R.id.button);
    mButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        // 调用JNI中的函数来启动JNI中的线程
        mainThread();
      }
    });
    // 初始化JNI环境
    setJNIEnv();
  }
  //由JNI中的线程回调类方法
  private static void fromJNI(int i)
  {
    Log.v("Java---------->", ""+i);
  }
       //自己定义的线程回调成员方法
  private void From_JNI_Again (int i)
  {
    Log.v("Java_object------------>", ""+i);
  }
  // 本地方法
  private native void mainThread();
  private native void setJNIEnv();
  static
  {
    System.loadLibrary("JNIThread");
  }
}

#include<stdio.h>
#include<stdlib.h>
#include<unistd.h>
#include<pthread.h>
#include<string.h>
#include<assert.h>
#include<jni.h>
#include<android/log.h>
#define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "jni_thread", __VA_ARGS__))
#define LOGW(...) ((void)__android_log_print(ANDROID_LOG_WARN, "jni_thread", __VA_ARGS__))
#define LOGE(...) ((void)__android_log_print(ANDROID_LOG_ERROR, "jni_thread", __VA_ARGS__))
// 线程数
#define NUMTHREADS 5
// 指定要注册的类
#define JNIREG_CLASS "com/example/jni_thread_demo/JNI_ThreadActivity"
// 全局变量
JavaVM* g_jvm = NULL;
jobject g_obj = NULL;
void* thread_fun(void* arg)
{
  JNIEnv *env;
  jclass cls;
  jmethodID mid, mid1;
  // Attach主线程
  if((*g_jvm)->AttachCurrentThread(g_jvm, &env, NULL) != JNI_OK)
  {
    LOGE("%s: AttachCurrentThread() failed", __FUNCTION__);
    return NULL;
  }
  // 找到对应的类
  cls = (*env)->GetObjectClass(env, g_obj);
  if(cls == NULL)
  {
    LOGE("FindClass() Error ......");
    goto error;
  }
  // 再获得类中的方法
  mid = (*env)->GetStaticMethodID(env, cls, "fromJNI", "(I)V");
  if(mid == NULL)
  {
    LOGE("GetStaticMethodID() Error ......");
    goto error;
  }
  // 最后调用java中的静态方法
  (*env)->CallStaticVoidMethod(env, cls, mid, (int)arg);
  //获得类中的“成员”方法
  mid1 = (*env)->GetMethodID(env, cls, "From_JNI_Again", "(I)V");
  if(mid == NULL)
  {
    LOGE("GetMethodID() Error ......");
    goto error;
  }
  // 最后调用类中“成员”方法
  (*env)->CallVoidMethod(env, g_obj, mid1, (int)arg);
  //错误处理代码
  error:
  //Detach主线程
  if((*g_jvm)->DetachCurrentThread(g_jvm) != JNI_OK)
  {
    LOGE("%s: DetachCurrentThread() failed", __FUNCTION__);
  }
  pthread_exit(0);
}
/*
 * Class:     com_example_jni_thread_demo_JNI_ThreadActivity
 * Method:    mainThread
 * Signature: ()V
 */
/*不用JNI_OnLoad时的复杂命名方式
JNIEXPORT void JNICALL Java_com_example_jni_1thread_1demo_JNI_1ThreadActivity_mainThread
  (JNIEnv *env, jobject obj)
{
  int i;
  pthread_t pt[NUMTHREADS];
  for(i=0; i<NUMTHREADS; i++)
  {
    // 创建线程，并指明调用的函数
    pthread_create(&pt[i], NULL, &thread_fun, (void*)i);
  }
}*/
/*
 * Class:     com_example_jni_thread_demo_JNI_ThreadActivity
 * Method:    setJNIEnv
 * Signature: ()V
 *//*不用JNI_OnLoad时的复杂命名方式
JNIEXPORT void JNICALL Java_com_example_jni_1thread_1demo_JNI_1ThreadActivity_setJNIEnv
  (JNIEnv *env, jobject obj)
{
  // 保存全局JVM以便在子线程中使用
  (*env)->GetJavaVM(env, &g_jvm);
  // 不能直接赋值(g_obj = ojb)
  g_obj = (*env)->NewGlobalRef(env, obj);
}*/
JNIEXPORT void JNICALL native_mainThread(JNIEnv *env, /*jclass clazz*/ jobject obj)// 使用jclass和jobject都可以
{
  LOGI("native_mainThread");
  int i;
  pthread_t pt[NUMTHREADS];
  for(i=0; i<NUMTHREADS; i++)
  {
    // 创建线程，并指明调用的函数，注意只接收一个参数i作为thread_fun的参数，后面会介绍怎么传多个参数
    pthread_create(&pt[i], NULL, &thread_fun, (void*)i);
  }
}
JNIEXPORT void JNICALL native_setJNIEnv(JNIEnv *env, /*jclass obj*/ jobject obj)// 使用jclass和jobject都可以
{
  LOGI("native_setJNIEnv");
  // 保存全局JVM以便在子线程中使用
  (*env)->GetJavaVM(env, &g_jvm);
  // 不能直接赋值(g_obj = ojb)
  g_obj = (*env)->NewGlobalRef(env, obj);
}
/**
* Table of methods associated with a single class.
*/
static JNINativeMethod gMethods[] =
{
    {"mainThread", "()V", (void*)native_mainThread }, // 绑定：注意千万签名结尾不能加分号！！！！！！
    {"setJNIEnv", "()V", (void*)native_setJNIEnv },
};
/*
* Register several native methods for one class.
*/
static int registerNativeMethods(JNIEnv* env, const char* className,
  JNINativeMethod* gMethods, int numMethods)
{
  jclass clazz;
  clazz = (*env)->FindClass(env, className);
  if (clazz == NULL)
  {
    return JNI_FALSE;
  }
  if ((*env)->RegisterNatives(env, clazz, gMethods, numMethods) < 0)
  {
    return JNI_FALSE;
  }
  return JNI_TRUE;
}
/*
* Register native methods for all classes we know about.
*/
static int registerNatives(JNIEnv* env)
{
  if (!registerNativeMethods(env, JNIREG_CLASS, gMethods,
      sizeof(gMethods) / sizeof(gMethods[0])))
  return JNI_FALSE;
  return JNI_TRUE;
}
/*
* Set some test stuff up.
*
* Returns the JNI version on success, -1 on failure.
*/
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved)
{
  JNIEnv* env = NULL;
  jint result = -1;
  if ((*vm)->GetEnv(vm, (void**) &env, JNI_VERSION_1_4) != JNI_OK) {
    LOGE("GetEnv failed!");
    return -1;
  }
  //===========================================
  assert(env != NULL);
  if (!registerNatives(env))
  {// 注册本地方法
    return -1;
  }
  //===========================================
  /* success -- return valid version number */
  result = JNI_VERSION_1_4;
  return result;
}

LOCAL_PATH :=$(call my-dir)
include $(CLEAR_VAR)
LOCAL_MODULE := JNIThread
LOCAL_SRC_FILES := JNI_Thread.c
LOCAL_MODULE_FILENAME := libJNIThread//如果报LOCAL_MODULE_FILENAME的错的话，需要加上这句话
LOCAL_LDLIBS := -llog
include $(BUILD_SHARED_LIBRARY)

struct mypara
{
  var para1;//参数1
  var para2;//参数2
}

struct mypara pstru;
pthread_create(&ntid, NULL, thr_fn,& (pstru));

void *thr_fn(void *arg)
{
  mypara *pstru;
  pstru = (* struct mypara) arg;
  pstru->para1;//参数1
  pstru->para2;//参数2  
}