Android - How the state of views are preserved during Fragment Transforamtion -

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this confuses me lot.

i had 2 fragments, , use fragmenttransaction.replace() swap 2 fragments. state of input controls radiogroup , checkbox preserved when switch other fragments , switch again.

enter image description here.

i set break point on oncreateview() of fragment, , every swap seems trigger method , new views created each time. savedinstancebundle null well. since new views created, how state of old views? 

public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     view v =  inflater.inflate(r.layout.fragment_fieldsetup_marking, container, false);    // ...  return v; }

this effect fine app, want know how implemented.

  1. where states stored?
  2. where android sdk code restore (i can not find in class fragmenttransection).


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