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Questions tagged [android-mvvm]

Questions regarding applying a Model-View-ViewModel in android application

773 questions
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How to add a datepicker through ViewModel class in MVVM android

I have a edittext and when I click tthat, I want to show a DatePicker, This is what I tried but I get an error android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running? class…
BRDroid
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Android Repository Pattern convert room to domain model

I am desperately looking for a possability to convert a room model to a domain model to enable offline functionality to my app. I have successfully implemented this pattern as described in this codelab:…
Max Mustermann
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MVVM: updating viewpager2's container view from inner fragments

I'm in trouble :D I starting to use mvvm and LiveData, and I want to do it in better way. I will try to explain you my doubt with a simple example : I have a container fragment "Exams" containing a ViewPager2 that contain some fragments…
aeroxr1
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Good practice for communicate between viewModel and fragment

I'm implementing the viewModel and for communicate between the viewModel and fragment I'm doing this : public class SplashViewModel extends AndroidViewModel { private LiveData actions; public SplashViewModel(@NonNull Application…
Vodet
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Why does ViewModelProvider creates new instance of view model on screen rotation?

Im trying to implement Paging but every time i rotate a screen constructor of view model gets called, thus triggering loadInitial to fetch new data from network in my DataSource class.Help appreciated // ViewModel def lifecycle_version =…
Nikola Srdoč
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Is it okay to store properties in a Repository for reuse?

I am making an app with some friends, and we have decided to go with the MVVM pattern. However, their understanding of the pattern differs from mine. My question is: If we have a data that we would like to reuse in other views, can we store them as…
redouane
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Changes are not observable by viewmodel

I have created an app which is relied on my local server which fetch profile image and information about user..Code works fine without any problem but when I change my data in the local server (for example profile picture )the updated profile is…
Hrishi Bargal
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How to Implement ViewModel Factory in Android

I am implementing Room database with ViewModel. Everything works well. But the requirement is I want to provide some dependency to ViewModel using AndroidViewModelFactory. I am able to create ViewModelFactory class which implements…
Satyam Gondhale
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For which other situations is ViewModel class useful for , (apart from screen rotation) when dealing with data?

I am beginner in Android studio and I started learning the different Architecture components within the Android Jetpack. When dealing with data, I realized that in almost every tutorial or documentation the ViewModel class is used. It is always…
Berni
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How to bind viewmodel to a gridView in android?

I have a gridView in my activity with a custom adapter class, I cannot figure out how to bindview model to my activity's gridView. Here is my gridview adapter: class ImageAdapter constructor(val mContext: Context, private val resource_layout: Int,…
SuvodipMondal
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How to reuse a Fragment and ViewModel with different Repository Implementation injected by Dagger2.2

I'm kinda new to Android development and I have been stuck finding a way to do this pattern using some android libraries like Dagger2, Fragments, and ViewModel. I hope some of you can help me with this or stating what's the common way to do this on…
MarMass
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Best practice using RecyclerView, ListAdapter and ViewModel for saving checked status

I am using RecyclerView with ListAdapter which using DiffUtil internally to show the data. Of course, all the data was provided by ViewModel via LiveData. Now each item view has a CheckBox, meanwhile I implemented drag selection function by adding…
Chenhe
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DiffUtil not updating ListAdapter after updating ArrayList contents

I am trying to update ArrayList which is inside in MutableLiveData. whenever I change the content in ArrayList, ListAdapter is not updating. ViewModel private var _tileNumberList:MutableLiveData> = MutableLiveData() var…
iamkdblue
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MVVM average Fragment inflation time and how to improve performance

I have recently re-written an app for a client. The original was made up of about 20 activities and has now changed to a single activity and about 7 fragments with ViewModels for each fragment. Its a pretty small app in general so I simply swap…
DevinM
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how to understand the dependency on mvvm?

I know that the mvvm model is seperated to 3 elementes, model viewmodel view. but studying mvvm with my application dev, I thought there is really no dependency? here is my code on MainActivity. Do I misunderstand the mvvm or misuse? I think the…
jakchang
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