can we convert Audio (.mp3) to video (mp4) in android studio? how?

Question

i am new in this and i am working on App of media player and recording app. in which i have shown song list of device in the listview and recording start / stop / play. Now i want to convert that .mp3 recorded file into .mp4 and one image will show on behalf of a video in that file. Help me to achive this i have no idea and i refer many links and i didnt find anything.

Answer 1

Please check this link for your first question:
Why can't we initialize class members at their declaration?

Usually constructor is use to initialize value to data variables of class.

For 2nd Question: If data member is not initialize after creation of object, It will contain garbage value. So initialize or assign suitable value to as per your need.

Check below code:

#include<iostream>
using namespace std;

class swap_values
 {   
    int a, b, temp;
    public:
        swap_values(){
            a=0;b=0;temp=0;
        }
        swap_values(int x, int y){
              a = x;
              b = y;
              temp = 0;
           }

        void swapped()       
        {
            temp = b;
            b=a;
            a=temp;
        }
        void print(){
         cout<<"a: "<<a<<" b: "<<b<<endl;
         }
 };

int main()
{  
   int x =10; int y = 20;
   swap_values obj(x, y);
   obj.print();
   obj.swapped();
   obj.print();

   return 0;
}