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This video tutorial is all about the ViewModel. We will learn how to use android ViewModel in our project.
ViewModel is an android architecture component which basically have 2 attributes –
Holds all UI related data for UI controller(Activity/Fragment)
Survives any runtime configuration changes like rotate phone from Landscape to portrait and vice versa.
Starter Project download link : https://bit.ly/2UmN4bt
First part link – https://www.youtube.com/watch?v=CI2umtlMQ5I
Full Playlist link : https://www.youtube.com/playlist?list=PLTNKiuHA_U6szz3Kg9baR5_01YasZXSul
ViewModel and LiveData dependency –
implementation ‘androidx.lifecycle:lifecycle-extensions:2.2.0’
Let’s consider the current situation. Right now all our UI related data are inside Fragment. And when we rotate our phone, the runtime configuration is changed. After that Android OS internal system recreates our Fragment, but our valuable data is lost already if we do not take any action to save data.
Here comes the ViewModel to save us from this situation. We store our UI related data into ViewModel instead of saving inside Fragment. And thus we make an association between our fragment and the ViewModel.
Now when we rotate our phone and the configuration changes and after that the Fragment is recreated. As we have an association with ViewModel we can get all our UI data to show inside our Fragment.
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Produce Android Apps – Why? How?
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The GUI based operating system Apple established for the Macintosh was the beginning of what would become Mac OS, but at the time is was simply called System software application. In 1984 this Apple OS was System variation 1.0 This early bundle streamlined the operation of a computer by concealing the complex instructions behind basic icons. Fantastic.
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Anyways, I know a lot of “those individuals” and they all have this app and enjoy it! You ought to take all of these aspects into consideration, in order to produce an effective web-based service.
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