Question

我将设置数据转换为JNI并将数据导入Java有些困难。我该怎么办？请参考此代码，因为我有什么不对，我不知道。请帮我解决这个问题。

Student.java

public class MainActivity extends AppCompatActivity {

    static {
        System.loadLibrary("native-lib");
    }

    public static native Student getStudentAge();

    protected Student student;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        student = getStudentAge();
        Log.d("TAG_DATA", String.valueOf(student.getAge()));
    }
}

MainActivity.java

JNIEXPORT jobject JNICALL
Java_com_example_helloJni_MainActivity_getStudentAge(JNIEnv *env, jclass type) {

    jclass fStdClass = env->FindClass("com/example/helloJni/Student");
    jobject nStdClass = env->AllocObject(fStdClass);
    jmethodID methodId = env->GetMethodID(fStdClass, "setAge", "(I)V");
    env->CallObjectMethod(nStdClass, methodId, 10);

    return nStdClass;
}

的本机lib.cpp

JNI DETECTED ERROR IN APPLICATION: the return type of CallObjectMethodV does not match

错误：

{{1}}

Answer 1

您需要使用CallVoidMethod，因为setAge返回void。

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