android jni头文件生成：
命令行生成头文件：
E:\eclipse workspace\MyFaceJniTest\src\com\facedetect\nativecaller>javac FaceNative.java -cp d:eclipse\adt-bundle-windows-x86-20130522\sdk\platforms\android-11\android.jar
E:\eclipse workspace\MyFaceJniTest\src>javah -jni -cp "d:eclipse\adt-bundle-windows-x86-20130522\sdk\platforms\android-11\android.jar";./ com.facedetect.nativecaller.FaceNative