#include <stdio.h>
#include <jni.h>
#include "com_example_ndkpassdata_DataProvider.h"
#include <android/log.h>
#include<malloc.h>
#define LOG_TAG "System.out.c"
#define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG,LOG_TAG,__VA_ARGS__)
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
char* Jstring2CStr(JNIEnv* env, jstring jstr) {
char* rtn = NULL;
jclass clsstring = (*env)->FindClass(env, "java/lang/String"); //String
jstring strencode = (*env)->NewStringUTF(env, "GB2312"); // 得到一个java字符串 "GB2312"
jmethodID mid = (*env)->GetMethodID(env, clsstring, "getBytes",
"(Ljava/lang/String;)[B"); //[ String.getBytes("gb2312");
jbyteArray barr = (jbyteArray)(*env)->CallObjectMethod(env, jstr, mid,
strencode); // String .getByte("GB2312");
jsize alen = (*env)->GetArrayLength(env, barr); // byte数组的长度
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;
}
JNIEXPORT jint JNICALL Java_com_example_ndkpassdata_DataProvider_add(
JNIEnv *env, jobject obj, jint x, jint y) {
LOGD("x=%d", x);
LOGD("y=%d", y);
return x + y;
}
JNIEXPORT jstring JNICALL Java_com_example_ndkpassdata_DataProvider_sayHelloInc(
JNIEnv *env, jobject obj, jstring jstr) {
char *cstr = Jstring2CStr(env, jstr);
LOGD("cstr=%s", cstr);
char arr[7] = { ' ', 'h', 'e', 'l', 'l', 'o', '/0' };
strcat(cstr, arr);
LOGD("newcstr=%s", cstr);
return (*env)->NewStringUTF(env, cstr);
}
JNIEXPORT jintArray JNICALL Java_com_example_ndkpassdata_DataProvider_intMethod(
JNIEnv *env, jobject obj, jintArray arr) {
int len = (*env)->GetArrayLength(env, arr);
LOGD("SHUZU length-=%d", len);
jint *intarr = (*env)->GetIntArrayElements(env, arr, 1);
int i = 0;
for (; i < len; i++) {
LOGD("intarr[%d]=%d", i, intarr[i]);
*(intarr + i) += 10;
//intarr[i] += 10;
}
(*env)->ReleaseIntArrayElements(env, arr, intarr, len);
return arr;
}
JNIEXPORT jint JNICALL Java_com_example_ndkpassdata_DataProvider_sub(
JNIEnv *env, jclass clazz, jint x, jint y) {
LOGD("x=%d", x);
LOGD("Y=%d", y);
return x - y;
}
