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From Liviacodes Some Of You Have Asked How The Architecture Of My Android App Looks Like I Used The Mvvm Pattern Model View Viewmodel The Basic Idea Of
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The Difference between them is we can pass Application Context which can be used whenever Application Context is required for example to instantiate Database in Repository.
Android model view viewmodel ViewModels usually expose this information via LiveData. ViewModel is AAC Android Architecture Component whose sole purpose is to survive configuration changes of Android ActivityFragment lifecycle so that data can be persisted via ViewModel for such case. The separate code layers of MVVM are.
Consider the following example where the ViewModel just exposes some data from the. The meaning of Model-View-ViewModel. One activity can have many fragment means two or more fragment can share one ViewModel.
Separation of concerns is a beautiful thing and every single design pattern tries to do the best that it can to achieve it. 04112016 The ViewModel is completely separated from the UI or any Android classes therefore straightforward to unit test. We need ViewModelProviders utility provided by Android to create ViewModels.
This achieved by caching VM instance in storage tied to hosting activity. The Activity or the Fragment should be able to observe changes in the ViewModel. If you are building an app of considerable complexity it is recommended to stick to.
The ViewModel class allows data to survive configuration changes such as screen rotations. The purpose of the ViewModel is to acquire and keep the information that is necessary for an Activity or a Fragment. AndroidViewModel is a Application context aware ViewModel.
31082018 Making an Android app in itself is not all that hard once you get the basics right. MVVM suggests separating the data presentation logic Views or UI from the core business logic part of the application. Accessing ViewModel inside Views on Android ViewModel Overview.
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