How to use 3 different Activities variables into another new activity?

Question

For example:

int a=5;  //in MainActivity.java
int b=7 //in MainActivity2.java
int c=8 //in MainActivity3.java   

and these three variables in another Activity i.e.

int total= a+b+c  //in MainActivity4.java

Answer 1

way 1: you can use public static variable.but static variable is memory leak.

public static int a=5;  //in MainActivity.java
public static int b=7 //in MainActivity2.java
public static int c=8 //in MainActivity3.java  


int total= a+b+c  //in MainActivity4.java

way 2: other way, save a,b,c in shared preference and in MainActivity4.java load there and use.

Answer 2

You can just make those variables static, and can access them from MainActivity4. If you want to make these variables private and write protected, then use a static getter method.

Answer 3

As mentioned in your code you are using

int a=5;  //in MainActivity.java
int b=7 //in MainActivity2.java
int c=8 //in MainActivity3.java   

To start activity you must be using below code

Intent intent = new Intent(this, yourRequiredActivity.class)
intent .putExtra("firstVariable", a);
intent .putExtra("secondVariable", b);
intent .putExtra("thirdVariable", c);
startActivity(myIntent);

And when new Activity starts use below code

 Intent mIntent = getIntent();
 int a= mIntent.getIntExtra("firstVariable", 0);
 int b= mIntent.getIntExtra("secondVariable", 0);
 int c= mIntent.getIntExtra("thirdVariable", 0);

And now you can use below code for your operation

int total= a+b+c 

hope that answers your question.