Timeline Mission not executing missions I want to make a timeline mission, where the drone visits a point and perform hot point mission there. But currently the drone is only taking off, the mission finishes and the drone returns back. I have checked the onProgress, not much could be found. Here is my code. fun initTimelineMission() { if (!isHomePointSet) { Log.e(TAG, "Home point not set") } else { val elements = ArrayList() missionControl = MissionControl.getInstance()...

Java Integer.MAX_VALUE vs Kotlin Int.MAX_VALUE I noticed, one interesting thing. Java's Integer.MAX_VALUE is 0x7fffffff (2147483647) Kotlin's Int.MAX_VALUE is 2147483647 but if you write in Java: int value = 0xFFFFFFFF; //everything is fine (but printed value is '-1') in Kotlin: val value: Int = 0xFFFFFFFF //You get exception The integer literal does not conform to the expected type Int Interesting right? So you're able to do something like new java.awt.Color(0xFFFFFFFF, true) in Java but not in Kotlin. Color class works...

Koltin class delegation, passing this Is there any possibility to pass this when delegating class in kotlin? class SomeFlow : Flow, SmsAuthentication by DefaultSmsAuthentication(this) It says this does not exist in this context. The other class looks like this: class DefaultSmsAuthentication(val flow: Flow) : SmsAuthentication

guice injection: difference among getBinding/getExistingBinding/getProvider and getInstance I have a PropertiesModule that extends AbstractModule and contains application constants that I use throughout the project: class PropertiesModule: AbstractModule(), Serializable { companion object { const val APP_NAME = "MyAppName" ... } override fun configure() { ... } } Then I use the PropertiesModule to create the injector: ... val injector = Guice.createInjector( PropertiesModule(), ... ) And later when I use the injector to get the property value, I have...

Sugar ORM - Update column of all entries on table How can I update a column for all entries in a table with Sugar ORM? I have my table "menu", and at some point I want all entries in this table to have the same value for the column "active". Right now I am doing something like this: val test = SugarRecord.listAll(Menu::class.java) print("stop") // breakpoint // at the first stop I can see all my entries with the correct value // then I try to execute this query to update all values from this table SugarRecord.executeQuery("UPDATE menu...

Android EffectFactory Bitmaps I am try to use EffectFactory in Android for some Image Manipulation. I tried out the sample and it works. Here the Sample: https://android.googlesource.com/platform/development/+/master/samples/HelloEffects/src/com/example/android/mediafx/HelloEffects.java But how can I load an image from my smartphone? The thing is...

What's the benefits of writing JavaScript code using Kotlin? While reading Kotlin to JavaScript tutorial, I'm just wondered what's the benefits of writing JavaScript code using Kotlin? Beside, there are already great tools for Javascript developing, like package-manager, Webpack, Gulp...

Can any One please tell me what the pros and cons of Kotlin are? Can any one please tell me what the pros and cons of Kotlin are? Not just the marketing stuff. Can I just write a part of my code in javascript and it will execute in the same thread, then it will continue with "java"? How would that work, I think you are blocking java, then starting up a new thread/(fiber, whatever) in V8 right? How exactly did you implement it? Can I write javascript, then have Kotlin call it seamlessly, use javascript objects, send them around, instantiate with Kotlin and...

KotlinJS: When would I use Kotlin dynamic type This is related to KotlinJS (transpiling Kotlin to JavaScript): Kotlin has a dynamic type that looks as follows: val dyn: dynamic ="String" dyn.thisMethodDoesNotExist(1,2,3) No type checks will be run and the code will simply be taken "as is" into the resulting JS files. "The most peculiar feature of dynamic is that we are allowed to call any property or function with any parameters on a...

Make dialog width to the full screen Yup this is asked several way but none of the method is working. I am trying to expend the dialog width to full screen. Dialog Layout: Dialog code: val dialogBuilder = AlertDialog.Builder(ContextThemeWrapper(context,R.style.ThemeDialog)) val inflater = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater val dialogView =...

Kotlin Local Delegated Properties Assignment Since Kotlin 1.1 we can use a so-called local delegated properties So basically I have a class: class App : Application() { lateinit var prefs: SharedPreferences } Now, I want to add a delegated property: var isInitialized: Boolean by prefs.boolean() This property, isInitialized must be initialized lazily since I'm using Android Dagger2 framework, which performs injection after...

Android studio kotlin plugin error In android studio im getting an error: Plugin Error: Kotlin threw an uncaught AbstractMethodError. Disable Plugin Yesterday everything was fine. Gradle: buildscript { ext.kotlin_version = '1.1.51' repositories { google() jcenter() mavenCentral() } dependencies { classpath 'com.android.tools.buildG3.0.1' classpath "org.jetbrains.kotlinkotlin gradle plugin$kotlin_version" // NOTE: Do not place your application...

Downloading a file from remote and save it to an Android device I'm new to Android, Kotlin and RxJava and I'm building an Android application which works perfectly fine, however, I want to break things up and this is where things gets messy for me. What I'm trying to do is decouple how the file is downloaded from where I save it to aka the storage. The code that works fine: The following code downloads a file from remote and finally save it to the storage. private fun downloadFile(url: URL): Observable { return Observable.create(fun(emitter)...

Context null , getting NPEs all of a sudden after moving to API 27 After upgrading to API 27 , I am seeing crashes of context being null in various places not seen before on Crashlytics. Has something changed ? How to fix this ?

Kotlin code coverage in CI pipeline Interested to find code coverage tools for kotlin that work well in a CI pipeline. use intellij built in code coverage but cant use this in CI. Thanks

Cannot Parcelize an object that contains a null variable I am trying to parcelize an object and pass it from one activity to another activity. However after I added the StatResponse into LoginResponse, then the compiler prompted me an error. java.lang.NullPointerException: Attempt to invoke interface method 'void android.os.Parcelable.writeToParcel(android.os.Parcel, int)' on a null object reference @Parcelize class StatResponse( @Json(name = "message") val message : String?, @Json(name = "status") val status : String? ):...

Float is invalid field for Realm comparison I have a very simple class in Realm: @RealmClass open class MethanolTest ( @PrimaryKey var substance: String = "", var value: Float = 0f, var _id: Long = 0 ): RealmModel Now I want to find a value that lies within some tolerance: fun findSubstancesInMethanolTest(height : Float) = KRealm.select { it .between("value",height-0.4,height+0.4) } It compiles ok, but at runtime fails with: java.lang.IllegalArgumentException:...

Firebase: reauthenticate Google Auth ERROR (Invalid id_token in IdP) I am having issues with reauthentication in Android (Kotlin). My goal is to delete a user account, I first get the current user via: val user = FirebaseAuth.getInstance().currentUser From user I am able to get the token, the issue occurs during the reauthentication function call. At this stage, the user has already logged in. This issue is not a Google Sign In issue. The code is as follows: user.getToken(true).addOnCompleteListener { task -> if (task.isSuccessful) { val...

Corda Settlement - Plan Phase Algorithm I am working on a POC for payment settlement in Corda. I came across Project UBIN and Project Jasper which solves the similar problem. I see both the projects tackle the Plan phase in different ways. Project Jasper uses a matrix based algorithm while Project Ubin uses a cycle-based algorithm(Cycle-solver). As I haven't practically implemented any of the above solutions yet, I need a suggestion on which approach should I use for my POC.

Inline Suspend Function Kotlin The compiler (Kotlin 1.1.60) won't let me inline suspend functions. The error implies that there's some work in progress as it says "not fully supported". Will this be enabled later? Any concrete plans? Inline lambda parameters of suspend function type are not fully supported. Add 'noinline' modifier. Example (not compiling): private inline fun launchInDispatcher(ctx: RoutingContext, block: suspend () -> Unit) { launch(dispatcher()) { block() } }

JobScheduling Periodic not working I have a job service that I want to be periodic, but it's not working. It's working with "requiredNetworkType" so the job is working fine, but somehow, the periodicity is never called. I tried with 10 seconds to check. val jobScheduler = getSystemService(Context.JOB_SCHEDULER_SERVICE) as JobScheduler jobScheduler.schedule( JobInfo.Builder(Constants.SYNC_JOB_ID, ComponentName(this, JobSchedulerSyncService::class.java)) .setPeriodic(10000) //NEVER...

Spring Boot tests do not reuse context I have a number of tests in my Spring Boot application and it seems that Spring Boot is performing the same context initialisation again and again for every test class. From what I read, Spring Boot should re-use the context by default, but for every test class it goes through the same initialisation like: 150552.909 [main] INFO RequestMappingHandlerMapping - Mapped "{[/api/item/{id}],methods=[GET],produces=[application/json;charset=UTF-8]}" onto public final MODEL_TYPE...

Parameter specified as non-null is null i am getting this error ? java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter databaseError at com.blackteck.gotz.fragment.PostListFragment$onStarClicked$1.onComplete(PostListFragment.kt:0) abstract class PostListFragment : Fragment() { // [START define_database_reference] private var mDatabase: DatabaseReference? = null // [END define_database_reference] private var mAdapter:...

How can i make this function in a functional programming way? How would I make this function into a pure function (functional programming)? fun validateOffer(offerValidateRequest: OfferValidateRequest, channelId: ChannelId, tenant: Tenant): OfferValidateRepresentation { val errorsList = mutableListOf() val successList = mutableListOf() offerValidateRequest.offers.forEach { val filterRequest = OfferGetRequest(it.id, it.type) val catalogs = findCatalogsWithOffers(filterRequest, channelId, tenant) val...

Recycler View not getting inflated. Getting the error, "No Adapter Attached, Skipping the layout" I am trying to inflate a recycler view based on response from network API. I am not able to inflate the recycler view. Apparently there is not error but this is showing the above error. I am pasting the code snippets for reference: Fragment class AppHomePageFragment : ParentFragment(), IAppHomePageContract.View { private var mAppHomePageRecyclerView: RecyclerView? = null private var mNoProductTextView: TextView? = null private val mAppHomePagePresenter = AppHomePagePresenter(this) private...

Android dynamic forms I am completely new to android developement. I am trying create a user input form which takes informations about multiple users from a single form. Basically each user data containes name ,age, phone and email. The application user should be able to create n number of user data by clicking (+) button.When (+) is pressed same forms will be created again and app user can remove the user data by clicking (x) next each user entry. Please guide me on how to do it.

Change nullability of overridden function's parameter in kotlin I am implementing an interface of a third party library(java). I am overriding a function with the following signature: override fun onCallback(name: String?) { } I can change to the following without the compiler complaining: override fun onCallback(name: String) { } What is the effect of this? What happens if the underlying library calls onCallback(null)?

Kotlin Either monad: Refactoring a constructor call to handle CPS I am an absolute beginner in functional programming and Kotlin, trying to solve exercises that I created from questions I'm asking myself; my current question being "How to put in practice functional programming onto real world applications using a Ports and Adapters architecture?" Currently learning about the Either monad, I have the following function in which Perhaps is just a renamed Either for use with <a href="https://vimeo.com/97344498" rel="nofollow noreferrer">exception...

How to get a object of MutableList&amp;lt;MDetail&amp;gt;? from json using Gson in Kotlin? I can use Code A to get a object aMListDetail from json using Gson. I think the data construction of Code A is too complex, so I hope to use Code B. but the code aMutableList= Gson().fromJson(mJson,MutableList?::class.java) in Code B can't be compiled, how can I do ? Thanks! Code A class DetailsHandler(mContext: Context = UIApp.instance) { data class MListDetail(val innerListDetail: MutableList) private var aMListDetail: MListDetail? var mJson: String by...

Plugin 'org.jetbrains.kotlin' failed to initialize and will be disabled. Please restart Android Studio After Android Studio's Kotlin plugin update, It stopped working. Plugin is getting disabled automatically. Below error I am getting. com.intellij.openapi.extensions.impl.PicoPluginExtensionInitializationException: Duplicate registration for EP: org.jetbrains.uast.uastLanguagePlugin: original plugin com.intellij, new plugin org.jetbrains.kotlin at com.intellij.openapi.extensions.impl.ExtensionsAreaImpl.registerExtensionPoint(ExtensionsAreaImpl.java:286) at...