Android activity & Activity Lifecycle | Android Tutorials | codetrix
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As a user navigates through, out of, and back to your app, the Activity instances in your app transition through different states in their lifecycle. The Activity class provides a number of callbacks that let the activity know when a state changes or that the system is creating, stopping, or resuming an activity or destroying the process the activity resides in.
Within the lifecycle callback methods, you can declare how your activity behaves when the user leaves and re-enters the activity. For example, if you're building a streaming video player, you might pause the video and terminate the network connection when the user switches to another app. When the user returns, you can reconnect to the network and let the user resume the video from the same spot.
Each callback lets you perform specific work that's appropriate to a given change of state. Doing the right work at the right time and handling transitions properly make your app more robust and performant. For example, good implementation of the lifecycle callbacks can help your app avoid the following:
Crashing if the user receives a phone call or switches to another app while using your app.
Consuming valuable system resources when the user is not actively using it.
Losing the user's progress if they leave your app and return to it at a later time.
Crashing or losing the user's progress when the screen rotates between landscape and portrait orientation.
This video explains the activity lifecycle in detail.
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