android NDK 实用学习-java端对象成员赋值和获取对象成员值

 1 　　 // 获取Java中Int数组赋值
 2     jintArray jint_arr = (jintArray)env->GetObjectField(jobj, jiarr);
 3     int arrInt[10] = {0};
 4     for(int i = 0; i < 10; ++i){
 5        arrInt[i] = 220+i;
 6     }
 7     env->SetIntArrayRegion(jint_arr, 0, 10, arrInt);
 8 
 9     // 获取Java中byte数组赋值
10     jfieldID jbyteArr = env->GetFieldID(jcSetDataMgr, "byteArr", "[B");
11      char arrByte[10] = "20200825";
12      jbyteArray jbyte_arr = (jbyteArray)env->GetObjectField(jobj, jbyteArr); 
13     env->SetByteArrayRegion(jbyte_arr, 0, 8, (const signed char*)arrByte);

bool bData = env->GetBooleanField(jcSetDataMgr, jfbdata);

double dData = env->GetDoubleField(jcSetDataMgr, jfddata);

int iData = env->GetIntField(jcSetDataMgr, jfidata);

char cData = env->GetByteField(jcSetDataMgr, jfcdata);

1 jfieldID jfsdata = env->GetFieldID(jcSetDataMgr, "sData", "Ljava/lang/String;");
2 jstring jtestStr = (jstring)(env->GetObjectField(jcSetDataMgr, jfsdata));
3 const char* testStr = env->GetStringUTFChars(jtestStr, NULL);
4 char testData[100] = {0};
5 strcpy(testData, testStr);
6 env->ReleaseStringUTFChars(jtestStr, testStr);

 1     jfieldID jiarr = env->GetFieldID(jcSetDataMgr, "intArr", "[I");
 2     if(NULL == jiarr){
 3         DEBUG_OUT("jfbdata fail!");
 4     }
 5 
 6     // 获取Java中数组属性arrays的对象
 7     jintArray jint_arr = (jintArray)env->GetObjectField(jobj, jiarr);
 8 
 9     int arrInt[10] = {0};
10     for(int i = 0; i < 10; ++i){
11        arrInt[i] = 220+i;
12     }
13     env->GetIntArrayRegion(jint_arr, 0, 10, arrInt);