例如有如下的native代码用来寻找类，然后注册接口函数：
static const char *classPathName = "android/device/PiccReaderNative/PiccReaderNative";static int registerNatives(JNIEnv* env){jclass clazz;clazz = env->FindClass(classPathName);if (clazz == NULL) {ALOGE("Native registration unable to find class '%s'", classPathName);return JNI_FALSE;}else{ALOGI("find class sucess");}if (env->RegisterNatives(clazz, gMethods, sizeof(gMethods)/sizeof(gMethods[0])) < 0) {ALOGE("RegisterNatives failed for '%s'", classPathName);return JNI_FALSE;}
有java代码如：
文件名为：android/device/PiccReaderNative/PiccReaderNative.java
package android.device.PiccReaderNative;public class PiccReaderNative {//picc jni apipublic native int picc_open();public native int picc_remove(byte mode);
之前我老是失败，原来是类名的格式没注意，类名classPathName的格式是：包名/类名，先提供包的名字，然后提供包里面的类的名字。从上面的例子，你的包名是android.device.PiccReaderNative，那么前面就是android/device/PiccReaderNative，包里面有个类叫做PiccReaderNative，那么后面的类名就是PiccReaderNative，所以全部的类的路径名就是：android/device/PiccReaderNative/PiccReaderNative
