Java与JNI类型转换，方法调用

算是Java和JNI的数据类型转换和方法的调用，算是基本工具类吧，没有详细整理。

//// Created by hongzhen on 2017/11/24.///* DO NOT EDIT THIS FILE - it is machine generated */#include <android/log.h>#include <stdio.h>#include "../include/hongzhen_com_jnitypeturn_JNITypeTurnUtils.h"/* Header for class wentsai_hisign_com_testlibrary_TestUtils */#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,"Yu" ,__VA_ARGS__) // 定义LOGI类型#ifdef __cplusplusextern "C" {#endiftypedef struct TestBean{unsigned char isBoolen;char isByte;char isChar;short isShort;int isInt;long isLong;float isFloat;double isDouble;char *isString;unsigned char *isBoolens;char  *isBytes;char *isChars ;short *isShorts;int *isInts;long *isLongs;float *isFloats;double *isDoubles;} *testBean;/*JNIEXPORT void JNICALL Java_wentsai_hisign_com_testlibrary_TestUtils_getStudent(JNIEnv *env, jclass jclas, jobject jobj) {jclass js = (*env)->GetObjectClass(env, jobj);jfieldID jidname = (*env)->GetFieldID(env, js, "name", "Ljava/lang/String;");jstring jstr = (*env)->GetObjectField(env, jobj, jidname);char *name = (*env)->GetStringUTFChars(env, jstr, NULL);LOGI("Name----%s", name);jfieldID jidage = (*env)->GetFieldID(env, js, "age", "I");jint age = (*env)->GetIntField(env, jobj, jidage);LOGI("Age----%d", age);jmethodID jmid_say = (*env)->GetMethodID(env, js, "say", "()V");(*env)->CallVoidMethod(env, jobj, jmid_say);jstring new_jstr = (*env)->NewStringUTF(env, "LiTang");(*env)->SetObjectField(env,jobj,jidname,new_jstr);}*/void Jni2Java(JNIEnv *env, jobject jobj){//Jni类型转Java类型jclass jclas = (*env)->GetObjectClass(env, jobj);//--------------------------------------------------------//boolean型变量jfieldID fid_boolean = (*env)->GetFieldID(env, jclas, "isBoolen", "Z");jboolean jb =JNI_FALSE;(*env)->SetBooleanField(env,jobj,fid_boolean,jb);//--------------------------------------------------------//byte型变量 isBytejfieldID fid_byte = (*env)->GetFieldID(env, jclas, "isByte", "B");jbyte my_byte=44;(*env)->SetByteField(env,jobj,fid_byte,my_byte);//--------------------------------------------------------------------------//char/short/float/double/long/与上面的一样//--------------------------------------------------------------------------//stringjfieldID fid_string = (*env)->GetFieldID(env, jclas, "isString", "Ljava/lang/String;");jstring jstr=(*env)->NewStringUTF(env,"王佳");;(*env)->SetObjectField(env,jobj,fid_string,jstr);//-------------------------------------------------------------------------------------//byte[]//获取fieldIDjfieldID fid_bytes=(*env)->GetFieldID(env,jclas,"isBytes","[B");//准备数据char my_bytes[5]={1,2,3,4,5};//创建jbyteArrayjbyteArray my_byte_arrsy=(*env)->NewByteArray(env,5);//将数据放入到jbyteArray(*env)->SetByteArrayRegion(env,my_byte_arrsy,0,5,my_bytes);//将jbyteArray存入到对应类的变量中(*env)->SetObjectField(env,jobj,fid_bytes,my_byte_arrsy);//--------------------------------------------------------------------------------------//int[]jfieldID jid_int_array=(*env)->GetFieldID(env,jclas,"isInts","[I");int my_ints[5]={11,22,3,34,35};jintArray my_int_array=(*env)->NewIntArray(env,5);(*env)->SetIntArrayRegion(env,my_int_array,0,5,my_ints);(*env)->SetObjectField(env,jobj,jid_int_array,my_int_array);}/*** Java类型的变量向jni类型转换* @param env* @param jobj*/void java2Jni(JNIEnv *env, jobject jobj) {//Java类型转jni类型jclass jclas = (*env)->GetObjectClass(env, jobj);//--------------------------------------------------------//boolean型变量jfieldID fid_boolean = (*env)->GetFieldID(env, jclas, "isBoolen", "Z");if (fid_boolean == NULL) {LOGI("Boolen---%s", "null");}jboolean jbool = (*env)->GetBooleanField(env, jobj, fid_boolean);if (jbool) {LOGI("Boolen---%s", "true");}//--------------------------------------------------------//byte型变量 isBytejfieldID fid_byte = (*env)->GetFieldID(env, jclas, "isByte", "B");if (fid_byte == NULL) {LOGI("Byte---%s", "null");}jbyte jfield_byte = (*env)->GetByteField(env, jobj, fid_byte);LOGI("Byte---%d", jfield_byte);char c_char=jfield_byte;LOGI("c_char---%d", c_char);//存储的是数值，以%d输出，如果以%c输出会没有结果//-----------------------4000---------------------------------------------//char型变量jfieldID fid_char = (*env)->GetFieldID(env, jclas, "isChar", "C");if (fid_char == NULL) {LOGI("Byte---%s", "null");}jchar jfield_char = (*env)->GetCharField(env, jobj, fid_char);LOGI("Byte---%c", jfield_char);char c_char1=jfield_char;LOGI("c_char1---%c", c_char1);//-----------------------------------------------------------------------------//ShortjfieldID fid_short = (*env)->GetFieldID(env, jclas, "isShort", "S");jshort jfield_shor=(*env)->GetShortField(env,jobj,fid_short);LOGI("Short---%d", jfield_shor);//-------------------------------------------------------------------------------//intjfieldID fid_int=(*env)->GetFieldID(env,jclas,"isInt","I");jint jfield_ing=(*env)->GetIntField(env,jobj,fid_int);LOGI("Int---%d", jfield_ing);//-------------------------------------------------------------------------------//longjfieldID fid_long=(*env)->GetFieldID(env,jclas,"isLong","J");if (fid_long==NULL){LOGI("Long---%s", "null");}jlong jfield_long=(*env)->GetLongField(env,jobj,fid_long);LOGI("Long---%ld", jfield_long);//----------------------------------------------------------------------------------//floatjfieldID fid_float=(*env)->GetFieldID(env,jclas,"isFloat","F");jfloat jfield_float=(*env)->GetFloatField(env,jobj,fid_float);LOGI("Float---%f", jfield_float);//-----------------------------------------------------------------------------------//doublejfieldID fid_double=(*env)->GetFieldID(env,jclas,"isDouble","D");jdouble jfield_double=(*env)->GetDoubleField(env,jobj,fid_double);LOGI("Double---%f", jfield_double);//-------------------------------------------------------------------------------------//StringjfieldID fid_string = (*env)->GetFieldID(env, jclas, "isString", "Ljava/lang/String;");jstring jfield_string = (*env)->GetObjectField(env, jobj, fid_string);char *name = (*env)->GetStringUTFChars(env, jfield_string, NULL);LOGI("String----%s", name);//-------------------------------------------------------------------------------------//byte[]jfieldID fid_bytes=(*env)->GetFieldID(env,jclas,"isBytes","[B");jbyteArray jfield_byte_array=(*env)->GetObjectField(env,jobj,fid_bytes);int size=(*env)->GetArrayLength(env,jfield_byte_array);//GetByteArrayRegion--进行值拷贝，将Java端数组的数据拷贝到本地的数组中char arr[size];(*env)->GetByteArrayRegion(env,jfield_byte_array,0,size,arr);int i;for ( i = 0; i < size; ++i) {LOGI("Byte---%d", arr[i]);}//GetByteArrayElements--指针的形式，将本地的数组指针直接指向Java端的数组地址，其实本质上是JVM在// 堆上分配的这个数组对象上增加一个引用计数，保证垃圾回收的时候不要释放，从而交给本地的指针使用，// 使用完毕后指针一定要记得通过ReleaseByteArrayElements进行释放，否则会产生内存泄露jbyte *byte_array=(*env)->GetByteArrayElements(env,jfield_byte_array,JNI_FALSE);int j;for ( j = 0; j < size; ++j) {LOGI("Byte---%d", *byte_array);byte_array++;}(*env)->ReleaseByteArrayElements(env,jfield_byte_array,byte_array,JNI_COMMIT);//--------------------------------------------------------------------------------------//int[]jfieldID jid_int_array=(*env)->GetFieldID(env,jclas,"isInts","[I");jintArray jfield_int_array=(*env)->GetObjectField(env,jobj,jid_int_array);int size_int=(*env)->GetArrayLength(env,jfield_int_array);//GetByteArrayRegion--进行值拷贝，将Java端数组的数据拷贝到本地的数组中int ints[size_int];(*env)->GetIntArrayRegion(env,jfield_int_array,0,size_int,ints);int a;for ( a = 0; a < size_int; ++a) {LOGI("Ints---%d", ints[i]);}//GetByteArrayElements--指针的形式，将本地的数组指针直接指向Java端的数组地址，其实本质上是JVM在// 堆上分配的这个数组对象上增加一个引用计数，保证垃圾回收的时候不要释放，从而交给本地的指针使用，// 使用完毕后指针一定要记得通过ReleaseByteArrayElements进行释放，否则会产生内存泄露jint *int_array=(*env)->GetIntArrayElements(env,jfield_int_array,JNI_FALSE);int s;for ( s = 0; s < size_int; ++s) {LOGI("Ints---%d", *int_array);int_array++;}(*env)->ReleaseIntArrayElements(env,jfield_int_array,int_array,JNI_COMMIT);//---------------------------------------------------------------------------------//其他类型的数组转换，跟byte[] ，int[]是一样的//对应签名：Object[]-[Ljava/lang/object;//          boolean[]-[B}//          char[]-[C//          short[]-[S//          long[]-[J//          float[]-[F//          double[]-[D//---------------------------------------------------------------------------------------//访问静态属性jfieldID jfid=(*env)->GetStaticFieldID(env,jclas,"staticInt","I");jint statcInt=(*env)->GetStaticIntField(env,jclas,jfid);LOGI("静态属性%d",statcInt);//---------------------------------------------------------------------------------------//访问Java方法jmethodID methid=(*env)->GetMethodID(env,jclas,"getIsInt","()I");jint result=(*env)->CallIntMethod(env,jobj,methid);LOGI("普通方法%d",result);//---------------------------------------------------------------------------------------//访问Java静态方法jmethodID md=(*env)->GetStaticMethodID(env,jclas,"getAge","()I");jint age=(*env)->CallStaticIntMethod(env,jclas,md);LOGI("静态方法%d",age);}JNIEXPORT void JNICALL Java_hongzhen_com_jnitypeturn_JNITypeTurnUtils_getTest(JNIEnv *env, jclass jclas, jobject jobj){java2Jni(env,jobj);Jni2Java(env,jobj);}#ifdef __cplusplus}#endif