Adding c++ to the mix

app/src/main/cpp/CMakeLists.txt

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+# For more information about using CMake with Android Studio, read the
+# documentation: https://d.android.com/studio/projects/add-native-code.html
+
+# Sets the minimum version of CMake required to build the native library.
+
+cmake_minimum_required(VERSION 3.4.1)
+
+# Creates and names a library, sets it as either STATIC
+# or SHARED, and provides the relative paths to its source code.
+# You can define multiple libraries, and CMake builds them for you.
+# Gradle automatically packages shared libraries with your APK.
+
+
+set (HEADERS
+        model/Song.h
+        )
+
+
+add_library( # Sets the name of the library.
+             native-lib
+
+             # Sets the library as a shared library.
+             SHARED
+
+             # Provides a relative path to your source file(s).
+             Demo.cpp
+             ${HEADERS}
+        )
+
+
+# Searches for a specified prebuilt library and stores the path as a
+# variable. Because CMake includes system libraries in the search path by
+# default, you only need to specify the name of the public NDK library
+# you want to add. CMake verifies that the library exists before
+# completing its build.
+
+find_library( # Sets the name of the path variable.
+              log-lib
+
+              # Specifies the name of the NDK library that
+              # you want CMake to locate.
+              log )
+
+# Specifies libraries CMake should link to your target library. You
+# can link multiple libraries, such as libraries you define in this
+# build script, prebuilt third-party libraries, or system libraries.
+
+target_link_libraries( # Specifies the target library.
+                       native-lib
+
+                       # Links the target library to the log library
+                       # included in the NDK.
+                       ${log-lib} )

app/src/main/cpp/Demo.cpp

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+//
+// Created by brahmix on 9/26/19.
+//
+
+#include <iostream>
+#include <cstring>
+#include <jni.h>
+#include <string>
+#include <iomanip>
+#include <sstream>
+#include <fcntl.h>
+
+#include <android/asset_manager_jni.h>
+#include <android/log.h>
+#include <android/sharedmem.h>
+#include <sys/mman.h>
+
+#include "model/Song.h"
+
+int demoCall()
+{
+    model::Song song;
+    song.title = "hello";
+    song.artist = "some artist";
+    std::cout << "testing" << std::endl;
+    return 0;
+}
+
+extern "C"
+JNIEXPORT void
+        JNICALL
+Java_com_example_mear_activities_MainActivity_test(
+        JNIEnv *env,
+        jobject /* this */) {
+
+    demoCall();
+}

app/src/main/cpp/model/Song.h

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+//
+// Created by brahmix on 9/26/19.
+//
+
+#ifndef MEAR_SONG_H
+#define MEAR_SONG_H
+
+#include <string>
+
+
+namespace model {
+
+struct Song
+{
+    int id;
+    std::string title;
+    std::string artist;
+    std::string album;
+    std::string genre;
+    int duration;
+    int year;
+};
+}
+
+#endif //MEAR_SONG_H

app/src/main/cpp/model/User.h

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+//
+// Created by brahmix on 9/26/19.
+//
+
+#ifndef MEAR_USER_H
+#define MEAR_USER_H
+
+#include <string>
+
+namespace model {
+struct User
+{
+    std::string username;
+    std::string password;
+};
+}
+
+#endif //MEAR_USER_H