How to implement the call back mechanism between Activites

I have 2 activities first details activity and second activity page is confirmationPage,Once i confirm it should come back to first page,how should i handle this scenario?

Is it possible between activities,instead of using fragments?

you have to use startActivityForResult(); method when you start the secondActivity.

and you also have to implement the onActivityResult() method.

Here is the code for first Activity..

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        super.onActivityResult(requestCode, resultCode, data);

        if (resultCode == 1) {
            Bundle extra = data.getExtras();
            String ID = extra.getString("NameKey").trim();
             // do your code here.
            
        }
    }

Code in the second Activity..

add the code on confirm click button.

  Intent i = new Intent();
  Bundle extra = new Bundle();
  extra.putString("NameKey", KeyValue);
                
  i.putExtras(extra);
  setResult(1, i);
  finish();