Return vector<string> from c++ to Java

Question

I am trying to learn android ndk. Below is my Java method :

public static native Vector<String>     GetData(String input) ;

'input'(input parameter) will go to the c++ native method which will return a vector. How do I implement the c++ side of the method?

Answer 1

1) It would be easier to use an array and not a vector:

    public static native String[] getData(String input);

2) Lets assume your Java package name is com.example.jeff and you have a class named MyCppFacade that contains getData(). You need to create a C++ file that contains this function:

    extern "C" jobjectArray Java_com_example_jeff_MyCppFacade_getData(
    JNIEnv* env, jobject obj, jstring input)
    {
         jobjectArray result;
         ...
         return result;
    }

3) To create your string array you could look at Return a String array on a JNI method.