8.3.3. Method onSaveInstanceState
onSaveInstanceState is called by the system when the configuration of the device changes during the app’s execution—for example, when the user rotates the device or slides out a keyboard on a device with a hard keyboard. This method can be used to save state information that you’d like to restore when the app’s onCreate method is called as part of the configuration change. When an app is simply placed into the background, perhaps so the user can answer a phone call or when the user starts another app, the app’s GUI components will automatically save their contents for when the app is brought back to the foreground (provided that the system does not kill the app). We use onSaveInstanceState in Fig. 8.47.
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