Int in string does not change when i change the int value

Question

So I'm making a code that uses int value in a string(hardcoded btw), it works but when I incremented the value of the int by button click, the int in the string does not change as the increment.

int indexOfQuestion= 1; 
numberOfQuestion.setText("Question " + indexOfQuestion + " from " + lengthOfQuestion + " :" );
switch(v.getId()):
case R.id.next:
indexOfQuestion = indexOfQuestion+1;

so when I clicked the button, indexOfQuestion in numberOfQuestion stays 1. How do i change it automatically as I intended without long verbose codes? thanks

Answer 1

What actually you are doing is calling this statement each time whenever you click the button:

 int indexOfQuestion = 1; 

What you need to do is change the scope of int indexOfQuestion = 1; and take it to outside of the method body.

public class Test {
     private int indexOfQuestion = 1; 
}

Instead of putting it inside onClick function.

Answer 2

it won't change because you setText before you increment int value. if you want to apply changes, you should setText again after the incrementation.

int indexOfQuestion= 1;

numberOfQuestion.setText("Question " + indexOfQuestion + " from " + lengthOfQuestion + " :" );
switch(v.getId()):
case R.id.next: indexOfQuestion = indexOfQuestion+1;
numberOfQuestion.setText("Question " + indexOfQuestion + " from " + lengthOfQuestion + " :" );