How to organize model class right way in Kotlin? newbie in Kotlin there I have read the document about data class (model class as my understanding) at https://kotlinlang.org/docs/reference/data-classes.html And by this way, we can declare model class as below: data class AModel(var title: String, var body: String) Cool! It's so brief! So can I declare all model class in one file ? It's okay ? Example: data class AModel(var title: String,...

RxJava - return after some method is completed I am quite new to RxJava and I am tryign to implement and OAuth2 flow with refresh tokens in my Android/Kotlin app. I got a bit stuck with refreshing my access tokens inside an interceptor (I append access token for each API request inside an OAuthAuthenticator). The problem is that I would like to wait with populating the request until the token request is completed. Could someone hint me how to achieve this? This is my authenticator class: class OAuthAuthenticator( private val...

Spring Integration: downloading only new or updated files from FTP server? I'm using Spring Integration to write FTP-Client for getting files from remote FTP-Server. This service must download files with huge size so it's not optimal to download same file more than one time. Here is my configuration: @Bean open fun ftpSessionFactory() = DefaultFtpSessionFactory().apply { setHost(env.getProperty(FTP_HOST)) setPort(env.getProperty(FTP_PORT)!!.toInt()) setUsername(env.getProperty(FTP_USER)) setPassword(env.getProperty(FTP_PASSWORD)) } @Bean open fun...

Android- Expecting member declaration error class FingerprintHandler(private val appContext: Context) : FingerprintManager.AuthenticationCallback() { private var cancellationSignal: CancellationSignal? = null @RequiresApi(Build.VERSION_CODES.M) fun startAuth(manager: FingerprintManager, cryptoObject: FingerprintManager.CryptoObject) { cancellationSignal = CancellationSignal() if (ActivityCompat.checkSelfPermission(appContext, Manifest.permission.USE_FINGERPRINT) !=...

Can't remove the element in a mutable set if it is modified in Kotlin I have an issue when using removeAll(), some objects can't be removed properly. data class Dog(var name: String) val dog1 = Dog(name = "dodo") val dog2 = Dog(name = "mimi") val set = mutableSetOf() set.add(dog1) set.add(dog2) dog1.name = "dodo2" val before_size = set.size // 2 set.removeAll { true } val after_size = set.size // why it is 1!?, I expect it should be 0 The removeAll didn't work as I expected. There is still one element in the mutable set. Any idea?

How do I use Java collections of non-nullable elements from Kotlin? Using the interop automatisms Kotlin has for nullability, a method like this gets the proper signature in Kotlin: @NonNull public String foo(@NonNull String bar) { return "bar"; } Now lift the principle to collections (or other generics, I guess): @NonNull public Set foo(@NonNull Collection bar) { return new HashSet(); } This shows in Kotlin as foo(bar: (Mutable)Collection) : (Mutable)Set I'm fine with (Mutable), but how do I get rid of the platform types in the type...

Generics problems encountered by Kotlin and GSON I try to write a network request function，Its role is to analyze the general format and provide data content to callbacks. This is my defined class: data class Response( val code: Int = 0, @JvmSuppressWildcards var data: ArrayList, val message: String = "") in this class 'code' and 'message' is fixed，'data' has different types Select one of data: data class TestData( @SerializedName("create_by") val createBy: String = "", @SerializedName("create_time")...

Unresolved reference:toUpperCase Kotlin Im currently developing Kotlin in Android Studio 3.1 out of an JsonReader i receive an String!, which I'm trying to convert to upper case so what i do is: var name=reader.nextString().toUpperCase() the problem is, that the toUpperCase is not detected and i is marked as unresolved reference

Adding a dependency to library on Kotlin in full Java-project I created a simple library (AAR) on the Kotlin, when called up, interacts with the other application through the Broadcast mechanism. And now I had a question: how to properly connect it to third-party developers, as a file (not Maven), that them do not have to install a dependency on the Kotlin?

Force app to update when new version of app is available in android play store using kotlin lay Store App in my device still display old version (1) cause that i cannot update it from my device. But i can login the Play Store from PC, and see the latest version. Then i can update the app to latest version through PC Google Play Store.

Screenshot of Mapbox map without displaying it I need to display a few previews of addresses on the map on the same screen. To do that I'm going to display ImageViews with bitmaps instead of making multiple instances of MapView. But for that I need to find a way to capture these bitmaps. I found snapshot function in MapboxMap (https://github.com/mapbox/mapbox-gl-native/issues/6062), but it requires displaying of the map. val position =...

Exception while getting application icon android 8, works on android 7 I'm trying to get the large icon for the notification in android app like that: val bm = BitmapFactory.decodeResource(this.resources, R.mipmap.ic_launcher) It works correctly in android 7.1, but throws exception in android 8: Caused by: java.lang.IllegalStateException: bm must not be null It is the same code, nothing changes. Does someone know whats wrong? I'm using Kotlin(if it matters).

RecyclerView listen for it finished laying all items In my application I need to highlight certain item in my RecyclerView. The problem is that it's content changes as user types input to one TextField. The problem is I have to hit the moment when recycler finished processing adapter data change AND finished laying views after that. User types -> Content of recycler changes to match user input -> recycler finishes laying everything -> here my call must go I tried GlobalLayoutListener, HierarchyChangedListener and some others but they do not...

Android unit test for repository I try to test repository on fake response from api. I have mocked all dependencies of this repository. And for my target api call I return fake data, but when I call getData from repository it returns nothing. Here is my test class: class DataRepositoryTest : UnitTest() { private lateinit var dataRepository: DataRepository @Mock private lateinit var restApi: RestApi @Mock private lateinit var cacheAssignmentsData: List @Mock private lateinit var cacheNotesData: List @Mock private lateinit...

Firebase Value event listener not responding I am new to Firebase . I think I have done it all right,here is my code ,I don't know why this function is not working. database!!.addValueEventListener(object:ValueEventListener{ override fun onCancelled(p0: DatabaseError?) { } override fun onDataChange(p0: DataSnapshot?) { var name=p0!!.child("name").value.toString() var status=p0.child("Status").value.toString() var image=p0.child("image").value.toString() var...

Android org.json.JSONObject returns null in unit tests I have a problem connected with parsing JSON while testing functionality using JUnit. I want to test my parsing logic. While I am executing test case I receive an error message: java.lang.RuntimeException: Method getString in org.json.JSONObject not mocked I have read that there is a need to provide additional dependency to tests because of org.json is provided with Android SDK, so I have put into gradle: testImplementation 'org.jsonjson20180130' Unfortunately, this has no effect. Error...

Select a value from a NumberPicker I'm trying to make a custom NumberPicker to display in a DialogFragment. So far I've succeeded in getting the picker to display in a dialog fragment and getting it to display the custom strings I want it to. I've also disabled the descendantFocusability so the text is not editable. Here is an overview of the questions I have about NumberPicker behaviour, I'll go more in depth after: How does one 'commit' their selection? How to return the selected value? How does one 'commit' their...

Docker can't start - (No such file or directory) I want to deploy my Spring boot application with docker, at the moment it is running on AWS Beanstalk without problems. I have no problems building the container, but when i try to run it like this: docker run -p 8080:8080 bogsbinny/mobile-bff then I get this error: FileNotFoundException: ./resources/serviceAccount.json (No such file or directory) I had the same error when I first went from running my Spring app on localhost, to running it on AWS, but it was fixed by marking the...

How to create Weekly Calendar view in Android with and without help of external library? - Kotlin I need a functionality to display the Weekly calendar view like below: I have referred to the following external libraries: https://github.com/tiagohm/HorizontalCalendarView - I tried, but it is not working https://github.com/nomanr/WeekCalendar -...

Click on view behind button if it's not clickable (isClickable = false) I have a recycler with rows of buttons. These buttons are only reused for styling purposes and set to isClickable = false. The buttons are laied out in a grid view in order to dynamically handle any number of buttons. When I click anywhere on a row i want to trigger a onClickListener set on each row parent view. I tried a setting a empty Relative View over the entire view and setting the onClickListener on it. No result. xml: in adapter: override fun...

java.lang.RuntimeException: Unable to start activity ComponentInfo{ } kotlin.KotlinNullPointerException --- full error stacktrace-------- 04-05 160134.265 18746-18746/? E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.mrathi.livedataviewmodel, PID: 18746 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.mrathi.livedataviewmodel/com.example.mrathi.livedataviewmodel.MainActivity}: kotlin.KotlinNullPointerException...

LiveData observeForever not working I've a WeatherRepository class which calls the WeatherProvider class to start fetching the weather. After the weather is successfully fetched, I simply post that weather using postValue function but the observer on that livedata in the WeatherRepository class's init block never gets called. I am confused as what am I missing... Any insights would be extremely helpful. Here's my code for Repository and Provider: class WeatherRepository @Inject constructor(private var weatherDao:...

Kotlint with Dagger2&Databinding occur : Execution failed for task ':app:kaptDebugKotlin' I got a problem with Kotlin when using Databing and Dagger2.Here is my gradle code: apply plugin: 'com.android.application' apply plugin: 'kotlin-android' //Kotlin apply plugin: 'kotlin-android-extensions' //KotlinExtension apply plugin: 'kotlin-kapt' //KotlinKapt android { compileSdkVersion rootProject.ext.androidCompileSdkVersion buildToolsVersion rootProject.ext.androidBuildToolsVersion defaultConfig { applicationId...

ClassCastException on deserialization I have next flow: Save entity to the database CLOB column, and then read it. I'm able to deserialize the entity - it's still working, but when i try to cast it to the given type, i see ClassCastException. The name of entities class that i'm deserializing is the same as name of a class. I found that it may be because different classloaders load this type on save and on read. How is it possible? I'm using kotlin's 'as' keyword to cast object.

ActiveMQ: Intercept publishing to a certain topic I'm setting up an ActiveMQ broker with MQTT that uses an external service for user authentication. I figured out how to write a BrokerFilter and plug it into a broker, so the basics are covered. I could even limit users in the topics they are allowed to subscribe on using the addConsumer() override. That method looks like this, and works: override fun addConsumer(context: ConnectionContext?, info: ConsumerInfo?): Subscription { // let connections from the local vm through...

Upload an image to server in Kotlin Everything is in the title : How do I upload an image to a server in Kotlin ? I tried a lot of different tutorials, none worked (maybe I did them bad) Here is what I did : class ProfileFragment : Fragment() { var profileImage : SimpleDraweeView? = null override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { // [...] profileImage = binding.profileImage...

Optimize search in list (Kotlin/Android) Android, Kotlin 1.2. I have code like data class Item(val id:Int,val field1:String, val field3:Array,val field2:String) val items:List = .... var str:String='string_to_search' I need to filter items list by str so I get sublist which contains onyly items in which str is case-insensitive substring of either field1 or field2 or both (it doesn't matter which one was matched or exact offset). Right now I use code like this: filteredItems=items .filter {...

Cannot be provided wihout an @Inject constructor or from an @Provides-annotated method when I create my default activity, I try to add the activities and fragments that I have created in the graph to the dagger. Generate time I get an error for AppComponent. MyApplication class MyApplication : Application() , HasActivityInjector { @Inject lateinit var activityInjector : DispatchingAndroidInjector companion object { lateinit var context : Context } override fun onCreate() { super.onCreate() context = this...

A way for multiple inputType in EditText in Android Kotlin using Anko I noticed that there is no way for anko to add multiple inputTypes for editText as xmls did. In xmls it would have been as simple as: android:inputType = "numberSigned|numberDecimal" But in Anko it recieves only an int as an argument for inputType. editText { inputType = 2002 } I've tried to search for other ways but I keep seeing xml tutorials and I have not seen any Anko example where it has two inputTypes in it. Is there a way to do this in Anko or should I revert to using xmls...

Kotlin:What diffrence between four expression?