Application Life Cycle Flow:
I have explained clearly in the above flow chart on WP8 Application Life Cycle. All the application events will occur in App.xaml file.
Not Running / Idle State:
After installing or closing the application, application is in not running state.
Launching Event and Running State:
When the user open the application, application launching event occurs and application reaches to Running State.
Deactivating Event and Dormant State:
When user receives the phone call/ opened any other application, deactivating event will occur and reaches to Dormant State. In this state, user won't lose any unsaved date (if user entered something in text box, text will be there when the application backs to running state)
Dormant State and Activating Event:
When user the finishes the phone call or close the previously opened application, application activating event will occur from dormant state. In this case, user can see the entered data.
Tombstone State and Activating Event:
When user opening the multiple application which reaches the max. limit of 6 and opening the 7th application, 1st opened application will move to tombstone state which release all the memory used by 1st application and lose unsaved data.
When user pressing back key continuously 6 times when they are in 7th application, application activating event of 1st application will occur and move to Running state from tombstone state.
Closing Event and Not Running State:
When user closes the application, closing event will occur and application moves to Not running state.
As a best practice, user has to save the data while application deactivating event occurs itself if they don't want to lose any data. And also, if user wants to load application wide data, it should be done in Application Launch event.
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