As you can see I am composing an arraylist based on which checkboxes are flagged. If I check Checkbox1 it adds the String "newString".
Then, I convert the ArrayList to a String ("X").
Lastly, I create the finish method and set "result" as the string X.

Still I get the error from:
-String X = builder.toString().replace("[", "").replace("]", "");          -builder(the Arraylist) is highlighted
-returnIntent.putExtra("result", String.X);                          -"X" comes as an error-









public class Popup1  extends Activity {

    private TextView textViewResult;

    public String newString;

    public String bestemmia;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.popup3);

        textViewResult = (TextView) findViewById(R.id.textViewResult);

        final ArrayList<String> builder = new ArrayList<String>();

        final CheckBox checkBox1 = (CheckBox) findViewById(R.id.checkBox);
        checkBox1.setChecked(false);

         (...........)
                if (checkBox1.isChecked()) {
                    builder.add((String.valueOf(newString)));
                    builder.add("\n");
                } else {
                    builder.remove(String.valueOf(newString));
                    builder.remove("\n");
                }
            }
        });

        getData();
    }


    private void getData() {
    (..............)codingcoding
    }

    (coding)
    String newString= (String)(.................).toString();
    (..............)

    }

    String X = builder.toString().replace("[", "").replace("]", "");

    @Override
    public void finish() {

        // Prepare data intent
        Intent returnIntent = new Intent();
        returnIntent.putExtra("result", String.X);
        setResult(Activity.RESULT_OK, returnIntent);
        super.finish();
    }

}