1.首先确定环境是否支持javac,我就遇到使用java有用，而使用javac和javap都没有用.那一般就是环境变量的问题；
已我为例：原来CLASSPATH和JAVA_HOME只是配置在我的用户变量里面，后面我拷贝一份到系统变量中就解决了问题(重启电脑了javah不生效,需要保存重新保存一次,以管理员身份运行CMD);
2.进入项目根目录：
C:\WINDOWS\system32>e:E:\>cd E:\c_demo\AS_Jni_Project\voicechange\src\main\java
3.开始生成.h
这里有个-encoding UTF-8 是解决中文问题的 没加这句换会报错
E:\c_demo\AS_Jni_Project\voicechange\src\main\java>javah -classpath . -jni -encoding UTF-8 com.jszy.voicechange.MainActivity
到此.com_jszy_voicechange_MainActivity.h 问价就生成在E:\c_demo\AS_Jni_Project\voicechange\src\main\java 这个目录中
看我项目文件
代码段：
/* DO NOT EDIT THIS FILE - it is machine generated */#include <jni.h>/* Header for class com_jszy_voicechange_MainActivity */#ifndef _Included_com_jszy_voicechange_MainActivity#define _Included_com_jszy_voicechange_MainActivity#ifdef __cplusplusextern "C" {#endif#undef com_jszy_voicechange_MainActivity_MODE_NORMAL#define com_jszy_voicechange_MainActivity_MODE_NORMAL 0L#undef com_jszy_voicechange_MainActivity_MODE_LUOLI#define com_jszy_voicechange_MainActivity_MODE_LUOLI 1L#undef com_jszy_voicechange_MainActivity_MODE_DASHU#define com_jszy_voicechange_MainActivity_MODE_DASHU 2L#undef com_jszy_voicechange_MainActivity_MODE_JINGSONG#define com_jszy_voicechange_MainActivity_MODE_JINGSONG 3L#undef com_jszy_voicechange_MainActivity_MODE_GAOGUAI#define com_jszy_voicechange_MainActivity_MODE_GAOGUAI 4L#undef com_jszy_voicechange_MainActivity_MODE_KONGLING#define com_jszy_voicechange_MainActivity_MODE_KONGLING 5L/** Class:com_jszy_voicechange_MainActivity* Method: voiceChangeNative* Signature: (ILjava/lang/String;)V*/JNIEXPORT void JNICALL Java_com_jszy_voicechange_MainActivity_voiceChangeNative(JNIEnv *, jobject, jint, jstring);#ifdef __cplusplus}#endif#endif
已经成功了！！！！
