Implement callback function in JNI using Interface

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心在旅途 2020-12-05 11:12

I need to implement callback function in Java using “interface”. I have wrote the application part as MyJavaFunction(int size, m_GetSizeInterface);

m_Ge

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时光说笑 (楼主)

2020-12-05 11:52

#include 
#include 
#include 

class SimpleQueueEvent {

public:

    SimpleQueueEvent(){};
    ~SimpleQueueEvent(){};

    //for C++ code call
    int queueEvent(std::function func){
        int curTime = time(0) + rand() % 10000;
        eventMaps.insert(std::map>::value_type(curTime, func));
        return curTime;

        //Call Java method to invoke method, such as
        //env->FindClass("....");
        //jmethodID method = env->FindMethod("onPostQueueEvent"...);
        //env->InvokeVoidMethod();

        //Java code like this..
        // private void onPostQueueEvent(final int eventId){
        // listener.PostQueueEvent(new Runnable() {
        //    public void run() {
        //        nativeEventFunc(eventId);
        //    }
        // });
        // private static native void nativeEventFunc(int eventId);

    }

    void nativeEventFunc(int eventId){
        if(eventMaps.find(eventId) != eventMaps.end()){
            std::function func = eventMaps.at(eventId);
            func();
        }
    }



private:
    std::map> eventMaps;


};

//and test code is:

 SimpleQueueEvent queueEvent;
    std::function func = [](){
        printf("native runnable..\n");
    };

    int evenId = queueEvent.queueEvent(func);
    queueEvent.nativeEventFunc(evenId);

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