Android Architecture Components : LiveData
Live Data : Life-cycle aware Observables
As an Android developer you often have to work with data that is dynamic and changing with user input, device configuration changes, or even time changes. On top of this as a developer you have to respect the life-cycle of an Activity of Fragment that contains this dynamically changing data: stop updates onStop() or onPause() and restart the updates onStart() and onResume(). Examples of this is location data, countdown timers, user's list selections and any other type of dynamically changing data. Lets see how we can make these tasks easier using LiveData. We will demonstrate LiveData by creating a self contained timer.
Subclass LiveData
Observe with LifecycleOwner
Instantiate the TimerLiveData object and then observe() in order to get callbacks on timer's value changes but only while our Activity is active.Benefits of using LiveData
- Makes objects life-cycle aware
- Keeps LiveData objects self contained
- Keeps Activitys and Fragments clean
- Eliminates memory leaks as LiveData objects clean up themselves.
- Observers instantly notified of value changes in LiveData
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