Room + ViewModel + LiveData + RecyclerView (MVVM) Part 1 - WHAT ARE ANDROID ARCHITECTURE COMPONENTS?

What people said

Recommends Alexander Robinson · 2019-06 · Stack Overflow · on “Getting data from database and displaying it in a dialogue box”

The easiest approach is to use Room and MVVM like this. [this video] The second option is to create a cursor and grab the data from that.

Recommends Shawn · 2019-09 · Stack Overflow · on “How to make many reference from one database?”

I Suggest using MVVM and changing FilmActivity to a fragment. I found the CodeInFlow video series to be the most helpful when learning ROOM. I believe your current approach is going to create memory links. [this video]

Recommends JDevoloper · 2019-09 · Stack Overflow · on “Reading and storing a set of data from Firebase Database?”

ok, if you want to store items that you have clicked, you need to use Room Persistance database. when you clicked the button you need to insert it. if you want to learn about room persistance database you can check this link : [this video] you will not need live data. but its really helpfull to learn room database tutorial..

Recommends nulldroid · 2019-10 · Stack Overflow · on “How to make fragment A know that button in fragment B is pressed”

You should really think about using LiveData and ViewModel from the Architecture components for your purpose, which is a recommended design pattern by Google. It needs a bit of time to get the hang of it, but you can use it for almost every app and it will make your problem really easy. See the following overview [LINK] for example. Here [this video] is a very good YouTube tutorial that describes exactly your note example, not for Firebase but for Android Room (local db instead of cloud). Its a bit lengthy but you will have a good understanding afterwards. Basically from your Firebase db you query all notes to receive a LiveData> allNotes You can then observe the LiveData allNotes to get the list

Recommends CoderUni · 2019-11 · Stack Overflow · on “Why the recycler view didn't come in activity page when I type recycler view”

You need to add RecyclerView to dependencies You don't need a LinearLayout . RecyclerView will set it for you when you add viewManager = LinearLayoutManager(this) . You can learn more about RecyclerView in this tutorial created by Coding in Flow: [this video] Check this docs out: [LINK] As a new member, you are expected to post your code and make your problems clear. You don't just ask why it doesn't work without showing the code. We cannot help you when you don't post any code or when you make us code something for you.

Recommends MurplePunky · 2020-05 · Stack Overflow · on “How do I get RecyclerView to use items from SQLite Database in a fragment?”

I'm building a simple information app about Cyber Security using Java in Android Studio to demonstrate how I've used Room, ViewModel, LiveData and RecyclerView. My knowledge of AndroidStudio is not great and I am still learning. I'm finding it very hard but I'm determined to keep going. The main issue I am having is getting my items from my database to show in the recyclerViews in my different fragments. (I followed much of this YouTube playlist to learn and help guide myself: [this video] ) At first I tried creating the RecyclerView inside the Fragement's 'onCreateView' method, but I was having trouble getting 'adapter.setItems(items)' to work, as in the videos he seems to put it into the 'onCha

Recommends Dimitri Hartt · 2020-07 · Stack Overflow · on “Files structure in MVVM (Android)”

I also would like to indicate watching this TUTORIAL [this video] . This guy goes well on teaching about the Architecture MVVM and also uses the ROOM Persistence Library. It is worth giving a look at it.

Recommends ueen · 2020-07 · Stack Overflow · on “Trying to get sum from Room database column”

This might be an issue with your repository instance, heres a great tutorial series, that teaches how to connect all the dots (Room-Repository-ViewModel) [this video]

Cites Shawn · 2019-04 · Stack Overflow · on “In Android Room how can I create and call a custom query”

I've set up a room database with 3 columns (title, descriptions, genre). I want to query the genre column with a user-specified genre(comedy, horror, etc) and return the results. DAO Interface I want the Query to only retrieve the entries where the genre matches the genre selected by the user. @Dao public interface MovieDAO { @Query SELECT * FROM movie_table WHERE genre") pubic LiveData<List<Movie>> getAllMovies(); } Repository Class In the Repository.class, can I pass the genre String selected by the user to the Query this way? public class MovieRepository { private MovieDao movieDao; private LiveData<List<Movie>> allMovies; public MovieRepository(Application application) { MovieDatabase da

Cites Djanito · 2020-06 · Stack Overflow · on “Filter RecyclerView's list with LiveData items with searchview”

I decided to optimize my code and therefore switch to liveData. I followed a tutorial on youtube ( [this video] ) but I do not quite understand how I can filter my recyclerView when the user enters a word since I do not store any list in my Adapter. I use a simple searchview filter system on my MainActivity. Moreover, I use DiffUtil to update my recyclerView and I update my Adapter thanks to: noteViewModel = new ViewModelProvider.AndroidViewModelFactory(getApplication()).create(NoteViewModel.class); noteViewModel.getAllNotes().observe(this, adapter::submitList); My code is almost identical to the video but here is a part of it: ViewModel: public class NoteViewModel extends AndroidViewModel { priv