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1，java 代码 结构体定义  public class MediaInfo
   {
 public int nWidth;
public int nHeight;
public String strStream;
 }
java jni接口定义 public native static int GetMediaInfo(int handle, MediaInfo info); //? c++ ndk 实现代码 JNIEXPORT jint JNICALL Java_src_jni_RtspConnect_GetMediaInfo
(JNIEnv *e, jclass c, jint h, jobject o)
{
//获取Java中的实例类
jclass objectClass = (e)->FindClass("src/jni/MediaInfo");
//获取类中每一个变量的定义
jfieldID strStream = (e)->GetFieldID(objectClass, "strStream", "Ljava/lang/String;");
jfieldID nHeight = (e)->GetFieldID(objectClass, "nHeight", "I");
jfieldID nWidth = (e)->GetFieldID(objectClass, "nWidth", "I");
//给每一个实例的变量付值
(e)->SetIntField(o, nHeight, 10);
(e)->SetIntField(o, nWidth, 100);
(e)->SetObjectField(o, strStream, (e)->NewStringUTF("my stream"));
return 0;
}
Java 调用 MediaInfo info = new MediaInfo();
RtspConnect.GetMediaInfo(0, info);
Log.i("info", ""+info.nHeight);
Log.i("info", ""+info.nWidth);
Log.i("info", ""+info.strStream);
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