How to use java classes within one activity?

Question

How can you use a java class within one activity, by that I mean is having different components of that activity spread out in a bunch of java classes. I\'m a little new to andr

Answer 1

like a before post XD with 1 java class, call it again after pressing buttons, for example, you can have a invisible buttons, radiobuttons whatever you want invisible and just with a click it turns visible and useful for you, here i go:

First the variable which controls the activity are going to do

String num ="";

then have your buttons, i use 2 of them and the others are invisible

Button bn1;
Button bn2;
Button bn3;
Button bn4;
bn3.setVisibility(View.INVISIBLE);
bn4.setVisibility(View.INVISIBLE);

then the button code, depends on how many buttons you want

Button.setOnClickListener(new Button onclickListener(){
        public void onClick(){
            //get a default variable in this case String num
    Intent intent = new Intent(MainActivity.this, MainActivity.class); num="cero"; intent.putExtra("po", num);
                        CodigoPeticion=2; startActivityForResult (intent,CodigoPeticion); finish(); break;
                }
            }
        });

this one to get the String num:

Bundle extras = getIntent().getExtras();
        if (extras!= null) {
            num =extras.getString("po");
        }

and at last but not least this one to do someting depending the String:

    if (num.matches("cero")){
                //do something, enable more buttons, disable radiobuttons,
bn3.setVisibility(View.VISIBLE);
            }else if(num.matches("one")){//this string is from another button
                //do something else in the same activity, as you spected enable radiobuttons, show a image, etc
bn4.setVisibility(View.VISIBLE);
            }else{
                //some textview with a specific title
                TextView.setText("Something's Wrong");
            }

don't forget the bn3 and bn4 listeners!

hope that helps you, see ya!