The Android Lifecycle refers to the series of events that occur in an Android app's lifetime, from when it is first launched by a user to when it is eventually closed. The Android platform provides a set of callback methods that developers can implement to handle these events.
The main stages of the Android Lifecycle are:
1. **onCreate()**: This method is called when an activity is first created. It is typically used to set up the UI and initialize any variables that will be used throughout the activity.
2. **onStart()**: This method is called when the activity is about to become visible to the user. It is typically used to start animations or other visual effects.
3. **onResume()**: This method is called when the activity is ready to interact with the user. It is typically used to start or resume any background processes that may have been paused while the activity was not visible.
4. **onPause()**: This method is called when the activity is about to lose focus. It is typically used to save any changes made by the user or pause any background processes.
5. **onStop()**: This method is called when the activity is no longer visible to the user. It is typically used to stop any background processes or animations.
6. **onDestroy()**: This method is called when the activity is about to be destroyed. It is typically used to release any resources that were allocated during the activity's lifecycle.
There are also some additional methods that can be used to handle specific events, such as onSaveInstanceState() and onRestoreInstanceState(), which are used to save and restore an activity's state across configuration changes (e.g. when the device is rotated).
It's important to note that the lifecycle of an Android app is not always linear - it can be interrupted by system events (such as phone calls or incoming text messages), user actions (such as pressing the home button or navigating to another app), or other factors. Developers should be aware of these interruptions and design their apps accordingly.
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