Android之——jni通用工具方法

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1、将java字符串转化为c++字符串

/** *工具方法 *将java字符串转化为c++字符串 *返回字符串数组的首地址 */char* Jstring2CPPStr(JNIEnv* env, jstring jstr, jstring encode) {char* rtn = NULL;jclass clsstring = env->FindClass("java/lang/String");jstring strencode = env->NewStringUTF(encode);jmethodID mid = env->GetMethodID(clsstring, "getBytes","(Ljava/lang/String;)[B");jbyteArray barr = (jbyteArray)env->CallObjectMethod(jstr, mid,strencode); // String .getByte("GB2312");jsize alen = env->GetArrayLength(barr);jbyte* ba = env->GetByteArrayElements(barr, JNI_FALSE);if (alen > 0) {rtn = (char*) malloc(alen + 1); //"\0"memcpy(rtn, ba, alen);rtn[alen] = 0;}env->ReleaseByteArrayElements(barr, ba, 0); //return rtn;}

2、将java字符串转化为c字符串

/** *工具方法 *将java字符串转化为c字符串 *返回字符串数组的首地址 */char* Jstring2CStr(JNIEnv* env, jstring jstr, jstring encode) {char* rtn = NULL;jclass clsstring = (*env)->FindClass(env, "java/lang/String");jstring strencode = (*env)->NewStringUTF(env, encode);jmethodID mid = (*env)->GetMethodID(env, clsstring, "getBytes","(Ljava/lang/String;)[B");jbyteArray barr = (jbyteArray)(*env)->CallObjectMethod(env, jstr, mid,strencode); // String .getByte("GB2312");jsize alen = (*env)->GetArrayLength(env, barr);jbyte* ba = (*env)->GetByteArrayElements(env, barr, JNI_FALSE);if (alen > 0) {rtn = (char*) malloc(alen + 1); //"\0"memcpy(rtn, ba, alen);rtn[alen] = 0;}(*env)->ReleaseByteArrayElements(env, barr, ba, 0); //return rtn;}

温馨提示：大家可以到链接http://download.csdn.net/detail/l1028386804/8922611获取完整的JNI调用示例代码

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