IOS Android back button

I'm looking for a recommendation on the best way to create a back button that would work on both IOS and Android. Would it be to simply create a Ti.UI.createButton() that links to the previous back?

here is an example of how to create the android back button using the Native back button.

Titanium.UI.setBackgroundColor('white');
 
var window1 = Ti.UI.createWindow({
  backgroundColor:"red",
  navBarHidden:false,
  title:"Main Window"
});
 
window1.addEventListener('click', function(){
 
  var window2 = Ti.UI.createWindow({
    backgroundColor:"green",
    navBarHidden:false,
    title:"Sub Window"
  });
 
  window2.addEventListener('android:back', function(e) {
    Ti.API.info("Log: The Android back button was pressed - DO SOMETHING!!!!");
 // when overriding the back button, the default behavior
 //   (in most cases, close) needs to be explicitly coded 
    window2.close();
  });
 
  window2.open();
 
});
 
window1.open();

you would basically add that event and either the name of the window to close or

Ti.UI.currentWindow.close();