For questions related to Android Room Persistence Library (which is a part of Android Architecture Components)
Room provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite.
Questions tagged [android-room]
6786 questions
2
votes
2 answers
How to update lazyColumn's item using the Flow list from room?
As below code showed, I got the list(type: Flow>),
how can I use it to update lazyColumn's item, so when the room data changed, lazyColumn updates items accordingly?
Many thanks.
@Composable
fun SomeContent(context: Context) {
// get the…
caibirdcnb
- 275
- 5
- 18
2
votes
1 answer
Room Database operations inside flow function
Here is my login function that return a flow
override fun loginMeIn(loginDto: LoginDto): Flow> = flow {
emit(Resource.Loading())
try {
Log.e(TAG, "loginMeIn : try");
val result = api.loginMeIN(loginDto)
…
Mohamed Amine Ayachi
- 163
- 2
- 11
2
votes
1 answer
Android Room Kotlin: entities with non data classes
Regarding to classes that can/may be used for entities in room whith Kotlin,
Is it mandatory to use data classes? Or could I use 'normal classes', i.e., the ones I use for the 'bussiness logic'
In case data classes are mandatory: can I add…
Krippulo
- 35
- 5
2
votes
1 answer
Android: how to insert data in manyToMany relationship in Room (Java)
Guys I'm trying to create a database with a manyToMany relationship, I'm able to create the 2 tables of elements but I'm not able to populate the joining table. I don't know how should I insert datas.
This is Card.class:
@Entity
public class Card…
Daniele Scalco
- 131
- 2
- 15
2
votes
1 answer
Difference between WorkManager and ExecutorService in android java?
I am a little bit confused on whether I should use WorkManager API provided by android or the ExecutorService which is a library by java.
I am working on a MVVM java android projects and i should perform async tasks to my database and i don't know…
Ivan Nikolovski
- 85
- 5
2
votes
1 answer
Fetch all with LiveData Room Kotlin
I am using Room in my project and I want to get list from the DB but I get null although anytime I don't use live data, I get the values so I know the data is available in the database.
@Dao
interface AddressDao {
@Insert(onConflict =…
King
- 1,885
- 3
- 27
- 84
2
votes
2 answers
Room unique constraint failed for primary key despite autoGenerate=true
Pretty much what it says on the tin: I'm using Room 2.4.1 on Android to store some data. I have an entity which is set to have an auto-generated primary key. However, I can only do one insert of an instance of that entity (which sets the primary key…
John Chrysostom
- 3,973
- 1
- 34
- 50
2
votes
1 answer
How can I observe a table in Room and get entities from other tables based on updates?
I want to use Coroutine flows to achieve this.
I have a DAO/Table in Room: info. This info-table is a lookup that holds id and type for other models. There's a table per type [A, B, C] and the id (PrimaryKey) in the info-table and corresponding…
Yokich
- 1,247
- 1
- 17
- 31
2
votes
2 answers
What should we do for nested objects in Room?
If there is a structure like my JSON structure below, how should we create Entity Classes? There are no examples of this. While @embeded was used for inner arrays in the articles written long ago, now a structure like converter is used. Which one…
user17115124
2
votes
1 answer
Even after reinstalling data is not removed in ROOM database
I have developed a simple e-commerce app, even after reinstalling I am still getting the products saved in ROOM database. I have clear data and cleared cache and reinstalled the app still I am getting the datas back. I have deleted individual data…
Rohit S
- 714
- 5
- 7
2
votes
0 answers
Kotlin livedata observer not triggered
i'm practising a bit with kotlin and was testing Room and livedata, my app gets data from a json and the stores it in room, i want to move this network call to its own file and class, but if i do so the observer i set to get the changes don't…
NicoTorrell
- 21
- 1
2
votes
2 answers
What's the recommended way to update Jetpack Compose UI on Room database update?
Right now, my method of updating my jetpack compose UI on database update is like this:
My Room database holds Player instances (or whatever they're called). This is my PlayerDao:
@Dao
interface PlayerDao {
@Query("SELECT * FROM player")
fun…
Dj Sushi
- 313
- 2
- 14
2
votes
2 answers
Room one-to-many, to many
I am little a bit confused on how i should set up a data class consisting of two lists.
I have a data class looking like this
@Entity(tableName = "recipe")
data class Recipe(
@PrimaryKey(autoGenerate = false)
val recipeName: String,
//val…
Bente61
- 21
- 3
2
votes
1 answer
Android ViewModel and Paging 3 Library
I am building a chat app where every data enter in room database first and it's on data insert the recyclerview get update with new data. It works as expected but now i need to update my paging library to version 3. For this i need to update these…
androidXP
- 1,692
- 3
- 27
- 58
2
votes
1 answer
Room field / getter mismatch warning when using sealed classes or Any
I have a Room (v2.4.0-beta01) database, and whilst it works fine, during the build it gives a field vs getter mismatch warning on a few fields, included below.
I suspect this is due to an interop issue between Kotlin and Java, since the field…
Jake Lee
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- 86