How setRetainInstance(true) affect lifecycle of Fragment

It's part of the articles of lifecycle: start reading from Understand lifecycle of Activity and Fragment, Introduction.

The Fragment.setRetainInstance() method control whether a fragment instance is retained across Activity re-creation (such as from a configuration change). This can only be used with fragments not in the back stack. If set, the fragment lifecycle will be slightly different when an activity is recreated:

• onDestroy() will not be called (but onDetach() still will be, because the fragment is being detached from its current activity).
• onCreate(Bundle) will not be called since the fragment is not being re-created.
• onAttach(Activity) and onActivityCreated(Bundle) will still be called.

~ reference: http://developer.android.com/reference/android/app/Fragment.html#setRetainInstance(boolean)

Refer to the last exercise, "UI elements lost after Activity/Fragment re-created". Consider the image_c, it is loaded in onCreateView(), only if savedInstanceState == null. Without setRetainInstance(true), it will not be loaded after orientation changed, because savedInstanceState != null.

MYTAG LogCat listed here:

Orientation changed:

• MainActivity.onPause
• MyFragment1.onPause
• MainActivity.onStop
• MyFragment1.onStop
• MainActivity.onDestroy
• MyFragment1.onDestroyView
• MyFragment1.onDestroy
• MyFragment1.onDetach
• MainActivity.onCreate / savedInstanceState != null
• MyFragment1.onAttach
• MyFragment1.onCreate / savedInstanceState != null
• MainActivity.onStart
• MyFragment1.onCreateView / savedInstanceState != null
• MyFragment1.onActivityCreated / savedInstanceState != null
• MyFragment1.onStart
• MainActivity.onResume
• MyFragment1.onResume

To know how setRetainInstance(true) affect lifecycle of Fragment, modify MyFragment.java from last exercise "UI elements lost after Activity/Fragment re-created", override onActivityCreated() method to call setRetainInstance(true).

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
  recLifeCycle_with_savedInstanceState(savedInstanceState);
  super.onActivityCreated(savedInstanceState);
  
  setRetainInstance(true);
 }

LogCat in Orientation Changed:

• MainActivity.onPause
• MyFragment1.onPause
• MainActivity.onStop
• MyFragment1.onStop
• MainActivity.onDestroy
• MyFragment1.onDestroyView
• MyFragment1.onDetach
• MainActivity.onCreate / savedInstanceState != null
• MyFragment1.onAttach
• MainActivity.onStart
• MyFragment1.onCreateView / savedInstanceState == null
• MyFragment1.onActivityCreated / savedInstanceState == null
• MyFragment1.onStart
• MainActivity.onResume
• MyFragment1.onResume

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* the original chart of fragment lifecycle is taken here.