1. JAVA实现

C++与JAVA使用JNI进行结构互传_jni

OneKeyVideoExport.java 

package com.example.jnibasetypedemo;

public class OneKeyVideoExport {
    public int percent;
    public int assaint_mode;
    public int assaint_state;
}

JNI原生方法声明：

public native OneKeyVideoExport getOneKeyVideoExportObjectFromJNI();

 

C++与JAVA使用JNI进行结构互传_jni_02

JAVA调用C++原生方法

C++与JAVA使用JNI进行结构互传_ide_03

OneKeyVideoExport obj= getOneKeyVideoExportObjectFromJNI();
        System.out.println("===> " +
                "percent:"+obj.percent +" " +
                "mode:"+ obj.assaint_mode+" " +
                "state:"+obj.assaint_state);

输出:

2025-01-16 00:25:33.399  7622-7622  System.out              com.example.jnibasetypedemo          I  ===> percent:90 mode:1 state:2
2025-01-16 00:26:30.431  7747-7747  System.out              com.example.jnibasetypedemo          I  ===> percent:90 mode:1 state:2

 

 

2.C++实现

C++实现原生方法给JAVA调用

C++与JAVA使用JNI进行结构互传_c++_04

extern "C"
JNIEXPORT jobject JNICALL
Java_com_example_jnibasetypedemo_MainActivity_getOneKeyVideoExportObjectFromJNI(JNIEnv *env, jobject thiz) {
    OneKeyVideoExport _one{0};
    _one.percent=90;
    _one.assaint_mode=1;
    _one.assaint_state=2;

    jclass clazz = env->FindClass("com/example/jnibasetypedemo/OneKeyVideoExport");
    jmethodID constructor = env->GetMethodID(clazz, "<init>", "()V");
    jobject jobj = env->NewObject(clazz, constructor);
    // 注意：这里的jobj是一个局部引用，如果你需要全局引用，请使用
    // jobject globalRef = env->NewGlobalRef(jobj);

    jfieldID percent = env->GetFieldID(clazz, "percent", "I");
    jfieldID assaint_mode = env->GetFieldID(clazz, "assaint_mode", "I");
    jfieldID assaint_state = env->GetFieldID(clazz, "assaint_state", "I");
    jobject OneKeyVideoExport_JavaObject = env->AllocObject(clazz);
    env->SetIntField(OneKeyVideoExport_JavaObject, percent, _one.percent);
    env->SetIntField(OneKeyVideoExport_JavaObject, assaint_mode, _one.assaint_mode);
    env->SetIntField(OneKeyVideoExport_JavaObject, assaint_state, _one.assaint_state);

    env->DeleteLocalRef(jobj);
    //env->DeleteGlobalRef(globalRef);
    env->DeleteLocalRef(clazz);

    return OneKeyVideoExport_JavaObject;
}

3.完整示例地址:

https:///tonyimax/JniBaseTypeDemo.git