Change value of a string in another activity (java/android)

Question

if I have a string in activityA, how can I modify this string in another activity (for example activityB)???

Note: I don't want to passing data from one activity to another, so I don't won't the copy of the string, but the real string of activityA in activity B

No, @andrewdleach is correct, strings are immutable. But I don't think that is what your question was about. If you want to read about it, go here: http://stackoverflow.com/questions/8798403/string-is-immutable-what-exactly-is-the-meaning — Zarwan, Aug 31 '15 at 21:00

score 3 · Accepted Answer · answered Aug 31 '15 at 20:51

3

One option is to make the variable global. For example (these classes are in two separate files):

public class A {
    public static String s = "A";
    //...
}

public class B {
    //...

   public static void vandalizeClassA() {
       System.out.println(A.s); //output will be "A"
       A.s = "B was here"; 
       System.out.println(A.s); //output will be "B was here"
   }
}

This is not specific to Android activities.

answered Aug 31 '15 at 20:51

Zarwan

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So I should declare the string public and static and then I call with nameClass.nameVariable my string in another activity? – Gabriele Marcozzi Aug 31 '15 at 20:57
Yes, that is one way to do it. – Zarwan Aug 31 '15 at 20:59
After the second System.out.print, the value of the string in class A is "B was here"?? – Gabriele Marcozzi Aug 31 '15 at 21:00
Well, after the `A.s = "B was here"` it is changed to that. I'm just printing it out to show you. – Zarwan Aug 31 '15 at 21:01

Change value of a string in another activity (java/android)

1 Answers1