How to organize frontend and backend for Kotlin SPA with Webpack I am developing an SPA with Kotlin (Ktor) on the backend. The project structure now is: . ├── frontend/

Pure Kotlin collection enabling to add elements at the head Does Kotlin provide a collection that enables to add elements at the beginning of the given collection? I am looking for Kotlin analogy to Java java.util.Deque implementations. Note: I am aware of the fact that I can use Java collections for this, however, I would like to know the Kotlin way.

NamedJDBCTemplate Parameters is list of lists I have a query which looks something like this: SELECT * FROM someTable t WHERE (t.a, t.b) IN (VALUES (1, 2), (3, 4)) And it would select any records where t.a == 1 AND t.b == 2 or t.a == 3 AND t.b == 4. This seems to work just fine. However, I can't figure out a clean way to specify the parameter to NamedJDBCTemplate. I tried giving it a list of lists (i.e., List), but it seems to blow up doing that. val query = "SELECT * FROM someTable t WHERE (t.a, t.b) IN (VALUES :values)"...

Proguard error: ProGuardTransform.transform while generating Signed APK Gradle: buildTypes { release { lintOptions { disable 'MissingTranslation' } minifyEnabled true shrinkResources true proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } Error: java.lang.RuntimeException: Job failed, see logs for details at com.android.build.gradle.internal.transforms.ProGuardTransform.transform(ProGuardTransform.java:196) at...

Using a when clause in an enum class getter in Kotlin I'm trying to get a specific getter of a property in kotlin to be based on the value of the enum it is called from. This is what I got so far: enum class Endpoint { EVENTS, GAMES; val baseUrl = "https://www.example.com/api" val path: String get() = when(this){ EVENTS -> "$baseUrl/events" GAMES -> "$baseUrl/games" } } Called like this: print(Endpoint.EVENTS.path) While this compiles without any problem, as soon as I run it I get a...

How can I deserialize Retrofit response with Gson to different List types? I register a TypeAdapter when I build my Retrofit instance, which delegates all API calls expecting a List response: val retrofit = Retrofit.Builder() .client(client) .baseUrl("$baseURL/") .addConverterFactory( GsonConverterFactory.create( GsonBuilder().registerTypeAdapter(List::class.java, MatchesDeserializer()) //Delegates all calls expecting return of type List....

Kotlin reading a file issue I am trying to read a csv file using jackson but whenever I actually go to declare the file, i get the below exception: IllegalStateException: classLoader.getResource("/src/integTest/testdata/Tests.csv") cannot be null The line of code in question: val file = File(javaClass.ClassLoader.getResource("/src/integTest/testdata/Tests.csv").file) Anyone else ever encountered this issue?

what is the Best way detect a video playback state in WebView? What is the best way detect a video playback state in a WebView? I'm using a flag and detect a video playback state in onProcessChanged But I think this is not a good way. Is there a more efficient way? not using a javaScriptInterface

Android Firestore query get the id of the document that contains the value in the search Hallo, I just tried to use firestore. I had some problem when getting document id. The question is, I want to get a document id (red box) which has value (blue box) in it. i use query collection("mychannel").whereEqualTo("74wRU4xHrcV9oWAXEkKeRNp41c53") but did not give results. Thanks

How to save captured photos as jpg files on android camera2 current when I click capture button, show camera preview capture image on Imageview.. but I want to save camera preview capture image in jpg format. in my storage. How to save my capture image? on `/sdcard/DCIM/' folder. //click button. captureBtn.setOnClickListener(View.OnClickListener { view -> takePicture() } fun takePicture() { mCameraDevice?.createCaptureSession(arrayListOf(mImageReader?.surface), mSessionCallback, null) } private val mSessionCallback = object :...

ListView in Fragment Error Kotlin New to KT. Im having some errors implementing my list view. Not exactly sure why im having these issues. Is it because it extends a fragment? Can someone point me in the right direction? import android.os.Bundle import android.support.v4.app.Fragment import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import android.widget.ListView import android.widget.ArrayAdapter class Chatroom : Fragment() { private lateinit var listView ListView override...

In Kotlin, Can I add an Elvis expression to a simpledateformat format? In Kotlin, Can I add an Elvis expression to a simpledateformat format? The compiler seems to accept it, but not sure of the results. Perhaps there is a better way to express this? sdf.format(getDateFromDatebase(nullibleDate))?:""

How to set default value for a INTEGER field of SQLiteDatabase in Kotlin I know that SQLiteDatabase have no Boolean field, so I need to set a INTEGER field for DBSettingTable.Status. I hope to set a default value 0 for DBSettingTable.Status, but the following code is wrong, how can I fix it? Thanks! import android.content.Context import android.database.sqlite.SQLiteDatabase import org.jetbrains.anko.db.* import ui.UIApp override fun onCreate(db: SQLiteDatabase) { db.createTable( DBSettingTable.TableNAME , true, DBSettingTable._ID to...

How to overwrite default detekt.yml? Is there a way to overwrite only a few config properties for detekt, and preserve most props from default-detekt-config.yml?

Dagger and Kotlin New to Kotlin and migrating a small Android project written in Java. Completely stuck on how to finish up this Dagger transition. Here is my Retrofit interface: interface DataFetcherService { @get:GET("config.json") val config: Observable companion object { fun create(): DataFetcherService { val retrofit = Retrofit.Builder() .addCallAdapterFactory(RxJava2CallAdapterFactory.create())...

Proguard configuration converting a project to Kotlin from Java Do I have to edit my proguard configuration if I am planning to transition from Java to Kotlin in Android?

Kotlin Dagger Module not set New to kotlin and trying to migrate over a small Android project written in Java. Don't know what to make of this error: Caused by: java.lang.IllegalStateException: com.mydomain.example.dagger.BusModule must be set

at com.mydomain.example.dagger.DaggerAppComponent$Builder.build(DaggerAppComponent.java:87)

at com.mydomain.example.MyApplication.buildComponent(MyApplication.kt:29)

at com.mydomain.example.MyApplication.onCreate(MyApplication.kt:17)...

startActivity with intent results in black screen within Activity the viewChange is executed and the intent received is also not null. The problem is, that there are no error messages displayed. Also there is no regularity on which the error occours. Sometimes the view chage is done correctly, but most of the time it's not done, which results in a black screen. Sure I'd prefer to remove the issue, but if there is a way to check if the screen is now null and retry the startactivity that would also be an acceptable solution for now. The...

Spring Boot transitive @Component dependencies with @ConditionalOnBean I have a Spring Boot 1.5.x project where some @Component depends on other @Component, and ultimately along the chain of dependencies, some @Component can be enabled or disabled completely using @ConditionalOnProperty. I am using @ConditionalOnBean to avoid instantiating @Component that depends on other @Component that have not been instantiated because of missing properties. However, it works only for direct dependencies, and not for transitive dependencies, but I can't understand why. Let...

Allow caller to listen to my speacker I've an app that is recording telephonic calls. Considering telephonic calls recoding is illegal in some countries unless you notify the other party, I need the my app to say "Your call is recorded" The below code work it perfectly for me, and I hear it, but the one who is calling is not hearing it!! how can I make him hear the same of what I hear on my speaker? class PhoneStateReceiver : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { prefs =...

How to display record per newline in Logcat in Android Studio? The following code convert a list to a string and display to Logcat, but all records are displayed in one line. I hope to display top 10 records per line in Logcat in Android Studio 3.0, how can I do ? Note: Log.e("My", logList.joinToString("", limit =10, truncated = "...more...")) doesn't work val logList=LogHandler().getListAllLog() Log.e("My", logList.joinToString("|", limit =10, truncated = "...more..."))

Is there a way to distinguish between source of voice in a telephonic call I've a telephonic calls recorder app that work with the below code: var IS_SERVICE_RUNNING = false class AudioService : Service(), MediaRecorder.OnInfoListener { lateinit var context: Context private var mRecorder: MediaRecorder? = null //setting maximum file size to be recorded private val Audio_MAX_FILE_SIZE: Long = 1000000//1Mb private var mOutputFile: File? = null private var mStartTime: Long = 0 private val outputFile: File get() { val...

Kotlin RxJava2 Flowable PublishSubject doesn't emit data onNext I know on stackoverflow we have a lot of similar questions, but i really don't know what i'm doing wrong. I have list objects. val applicationList: MutableList = generateApplications() After i create PublishSubject and Flowable val applicationsPublishSubject = PublishSubject.create() val applicationsFlowable = applicationsPublishSubject.toFlowable(BackpressureStrategy.LATEST) // The second variant // applicationsFlowable = Flowable.fromPublisher { applicationsPublishSubject } After...

Unable to load class 'com.google.common.base.Preconditions' When i try opening my projects on Android Studio 3.1.2 I get this Gradle Project Sync failed error with the message below Unable to load class 'com.google.common.base.Preconditions'. Possible causes for this unexpected error include: Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.) Re-download dependencies and sync project (requires network) The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle...

Change item nav_view after backpress in Kotlin By java we could do that by adding FragmentTransaction.addToBackStack(""+R.id.nav_new); and then write a some boiler plate: getSupportFragmentManager().addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() { @Override public void onBackStackChanged() { FragmentManager fm = getSupportFragmentManager(); String stackName = null; for(int entry = 0; entry < fm.getBackStackEntryCount(); entry++){ stackName =...

How can delete all records except latest 10 records with in Kotlin with anko? The Code B define a Log table, I hope to clear all records except latest 10 records. At present, I list all records order by CreatedDate, then I do a loop from 11th record to last record, and delete the record using Code A. Is there a better way to do that in Kotlin with anko ? Code A fun deleteDBLogByID(_id:Long)=mDBLogHelper.use{ delete(DBLogTable.TableNAME,"$idName = {$idName} ","$idName" to _id.toString() ) } Code B class DBLogHelper(mContext: Context = UIApp.instance) :...

Why no compile error when passing kotlin class to a Java function constrained by java generics? I'm having trouble enforcing type safety when using kotlin with Java. Please see the code snippets below showing setup, the lack of compile error is the issue. // kotlin functions inline fun k() = T::class fun a(clazz:KClass): A { return A(clazz.java) } // java interface interface DoA { void do(A a); } // kotlin class implements java interface class SomeDoA : DoA { init { do(a(k())); // I'd expect a compile error here, but none } }

How to solve kotlin cacheconfig error I use CacheConfig in Kotlin 1.2 so, I faced "unresolved reference: CacheConfig" Error

I Got rarely happens Can't access ViewModels from onDestroy I got an error like this after launch the app, and that very rarely happens. Here my complete Java stack trace associated: E/AndroidRuntime: FATAL EXCEPTION: main Process: com.mycompany.myapp.dev, PID: 11145 java.lang.IllegalStateException: Can't access ViewModels from onDestroy at android.arch.lifecycle.HolderFragment$HolderFragmentManager.findHolderFragment(HolderFragment.java:136) at...

Kotlin type mismatch (Databinding) private val binding: BottomSheetDialogWrapperBinding by lazy {BottomSheetDialogWrapperBinding.inflate(layoutInflater)} Error : Type inference failed. Expected type mismatch: inferred type is BottomSheetDialogWrapperBinding? but BottomSheetDialogWrapperBinding was expected Got error after update Android Studio Canary build 3.2. How to slove this issue