should I wrap Room operations into

try/catch

🤔?

How write this in Kotlin Class MyClass implement Serializable { Int id; String name; // getters & setters }

Hey guys. I wrote a short article about the usage of

SharedFlow

in Android: https://coroutinedispatcher.com/posts/shared-flow/

I asked this in #android-databinding, any thoughts on what might be wrong?

Is wrapping LiveData into a delegate a good/bad idea?

/**
 * Convenience property delegate for accessing and setting the live data value
 */
class LiveDataDelegate<T> : MutableLiveData<T> {

    constructor(value: T) : super(value)
    constructor() : super()

    operator fun getValue(thisRef: Any?, property: KProperty<*>): T? = value
    operator fun setValue(thisObj: Any?, property: KProperty<*>, value: T?) {
        this.value = value
    }
}

So then I could do:

// In Some ViewModel
private val stateDelegate = LiveDateDelegate(SomeState())
private var _state by stateDelegate
private val state: LiveData<SomeState> 
  get() = _state

fun onSomeUserEvent() {
  // no need to call state.value
  _state = _state.copy(
    // update the state
  )
}

Opinions are welcome

Question: when refactoring to use the LiveData Builder, I'm getting an unwanted database read whenever the screen rotates. Here is the code: Unwanted Read:

SomeViewModel: ViewModel(), LifecycleObserver {

   init {
       viewModelScope.launch { databaseStuff() }
   }

   suspend fun databaseStuff() =
       liveData {
           emit(ViewState.Loading)
           emit(retrieveDataUseCase.getDatabaseStuff().fold({
               ViewState.Error
           }, {
               if (it.retrievedFromDatabase) {
                   ViewState.ReadFromDatabase(it)
               } else {
                   ViewState.SuccessfulFetch(it)
               }
           }))
       }
   }
}

SomeFragment: Fragment() {
   viewLifecycleOwner.lifecycleScope.launchWhenCreated {
       viewModel.databaseStuff().observe(viewLifecycleOwner, {
           renderState(it)
       })
   }
}

Correct behavior:

SomeOtherViewModel: ViewModel(), LifecycleObserver {
   init {
       viewModelScope.launch { databaseStuff() }
   }

   val myLiveData: LiveData<Item>
       get() = _myLiveData
   private val _myLiveData = MutableLiveData<Item>()

   @ExperimentalCoroutinesApi
   suspend fun databaseStuff() =
       retrieveDataUseCase.itemFlow().collect {
           _myLiveData.value = it
       }
   }
}

SomeOtherFragment: Fragment() {
   viewLifecycleOwner.lifecycleScope.launchWhenCreated {
       viewModel.myLiveData.observe(viewLifecycleOwner, {
           renderState(ViewState.SuccessfulFetch(it))
       })
   }
}

Anybody know why the first case queries the database upon screen rotation, while the second does not? Thanks!

does anyone know if there is a way to improve android phone search in away that it finds installed apps easier? like is there something an android app developer can do? is here a content provider, a manifest configuration or something like that?

I have a question about retriggering a flow (Android app with Paging 3)

I’m playing with Jetpack DataStore, and it seems like there’s no way to synchronously get a key value? e.g. if I have access token stored in DataStore, and now I want to make a network request while already being in a Dispatchers.IO coroutine, how do I synchronously fetch my token?

I am new to android applications and just learning how to implement UI. I am having a challenge. How do I create rounded widget like the image below with android.

i have not had an npe in production in 4 years. ama

Is it possible to get a savedStateHandle for a fragment not attached to a NavHostFragment? Does the FragmentManager have a way to provide it directly?

This message was deleted.

Hey Dear community, While implementing Google Sign In functionality in my project I came access the issue ApiException:12500 https://stackoverflow.com/questions/64587610/google-sign-in-throws-an-exception-com-google-android-gms-common-api-apiexceptio Does anyone have the same and how I can fix it?

Hi everyone, I’ve created a Kotlin Multiplatform Dependency Injection Library in order so simplify things in DI world. Forget about modules, submodules, components, etc.... Let the compiler do all that staff for you, so you can simply USE dependency injection https://github.com/corbella83/PopKorn

📝 #NotyKT is a complete #Kotlin-stack application built to demonstrate the use of modern dev tools with best practices of implementation 🔥. Link: https://github.com/PatilShreyas/NotyKT

When taking calendars from Android using CalendarContract https://developer.android.com/reference/android/provider/CalendarContract how to force this to return account name (PROJECTION_ACCOUNT_NAME_INDEX) localised? It returns always “My calendar” text regardless current 

Locale

 in Android.

Hello guys, i'm Developing a custom view. How can i drag the text on the view with matrix.

Question about Flow together with Room databases. With Room+Flow, the query is “refreshed” whenever new data arrives, so keeping a list of items up to date is really easy, but what if the list depends on time as well, so the records in the database contains a timestamp and I want to show (with flow) the records from the last 5 minutes, updated every minute, is there anyway I can re-trigger the query manually, with flow or other techniques?

Does anyone have any experience with Kotlin + MvRx + Epoxy? I’m trying to build even a basic screen with a click listener, and can basically get a modicum of data to appear, but the app auto crashes when i attempt to do a click listener at all. I’m not sure what I’m doing. I’m coming from a ReactJS background and just feel simply lost. If someone would be willing to walk through some code with me on a screen share or something, I would greatly appreciate it.

Does "android-united community" even accept any invitation requests? I think I've requested one at least twice already and I didn't get anything.

Hi, I’m having an issue with Kotlin + RxJava3 + SqlDelight with the RxJava3 extension. Given this interface:

interface TasksDataSource {
    fun getTasks(forceUpdate: Boolean): Single<List<Task>> {
        if (forceUpdate) refreshTasks()
        return getTasks()
    }

    fun getTasks(): Single<List<Task>>

    ...
}

I have this issue when I try to implement it:

Is there any possibility to convert the new start activity for result api into a Kotlin Completable Deferred, taking into account destroyed state of the caller Activity?

Has anyone gotten "Code With Me" (the pair programming plugin from jetbrains) working with Android Studio?

I have a question I'm trying to parse JSON response from API and storing the data to DATA CLASS and sending the data to recycler adapter as ArrayList. The Json Array has another Array of objects inside, and i'm not able to find a way to properly parse that json response. Any help????

My current output

what is the best course to learn on how to develop for android? I have 2 years experience as back-end dev (using php, go, elixir)

I have a question Is there any drawback or some glitch maybe, if I'm using

loadUrl()

instead of

evaluateJavascript()

to call a javascript function from a Webview? My target device is 23+ From what I see in the documentation is that you should use

evaluateJavascript()

to call javascript function if the device KitKat+, the

loadUrl()

is for older device. The reason why I don't want to use

evaluateJavascript()

is because it's run asynchronously, which is not what I want. I had seek for the answers online but I still don't get it. Thanks for helping!

is there any way to remove start padding from RowsSupportFragment

Hello everybody, I have a question on KMM. I'm evaluating porting a Java module (shared through j2objc between ios and android) to KMM and I looked at the getting started guide in an existing project. The question is: which setup do you recommend to be able to still use the legacy common module while developing the new one? In particular I will need to let the two shared module communicate in some way since I cannot port it all together. So app will use "new shared in kmm" and "old shared in java" and the two shared modules need to communicate. Hope it's clear enough and thanks for helping in advance!