Question

So I have a main class and another class that has a variable I need to pull out into the main class. I have tried some of the ways posted on the answered questions like this, but I’m still failing to get it right.

public class Example extends MapActivity
{
    public void OnCreate(Bundle savedInstanceState){
        final Button bttn = (Button)findViewById(R.id.button1);
        bttn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                Toast tulos = Toast.makeText(getBaseContext(),
                                               "Area is: "
                                                +MyItemizedOverlay.alue +"" 
                     /*I get the non static variable error here
                       which I get as it is not yet defined, it will be after the user 
                       inputs values into the program*/
                                               ,Toast.LENGTH_LONG);
                tulos.show();
            }
     });

public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
    int alue;
        //irreleveant stuff (I assume)
    public void Calc(Geopoint gp, Mapview map){
        //there's some stuff before the variable I want to get like other variables
        //not relevant for my problem I hope

        alue = (int)Math.round(*formula: derived from user input data*)
    }
}

So how can I get a value out of my other class, as it doesn’t seem to be able to get it now? Or is this maybe an indication of a bigger problem?

Answer 1

There are two way

1 – make alue static but that will show the error that satic variable can't be accesses in non static function Calc so either make function Calcalso static as well or go to point 2

2-try this new MyItemizedOverlay().alue with making alue public as below

  public class Example extends MapActivity
    {
    public void OnCreate(Bundle savedInstanceState){
        final Button bttn = (Button)findViewById(R.id.button1);
    bttn.setOnClickListener(new View.OnClickListener() {
           public void onClick(View v) {
          Toast tulos = Toast.makeText(getBaseContext(),
                  "Area is: "
                  +new MyItemizedOverlay().alue +"" /<--------------------
    /*I get the non static variable error here
     which I get as it is not yet defined, it will be after the user has input 
    values into the program*/
                  ,Toast.LENGTH_LONG);
           tulos.show();
             }
         });

    public class MyItemizedOverlay extends ItemizedOverlay<OverlayItem> {
    public int alue; /<--------------------
        //irreleveant stuff (I assume)
    public void Calc(Geopoint gp, Mapview map){
        //there's some stuff before the variable I want to get like other variables
        //not relevant for my problem I hope
    alue = (int)Math.round(*formula: derived from user input data*)
    }