Gradual decrease of transparency I want to reduce the transparency of my picture from top to bottom, like this one. Please give me the code or tell me which library to use.

Kotlin Build Error with IntelliJ: not compatible with version of compiler? I have plans to investigate a bug in Spring-Integration. I have a fork on my local machine and setup a multimodule project in IntelliJ to test this. However, the build has problems within the IDE and I'm seeing this error message: ErrorKotlin [Internal Error] java.lang.IllegalStateException: The provided plugin org.jetbrains.kotlin.scripting.compiler.plugin.ScriptingCompilerConfigurationComponentRegistrar is not compatible with this version of compiler Do I need to adjust the Kotlin...

Android kotlin - upload image with Volley error: Accidental override: The following declarations have the same JVM signature val request = object:StringRequest(Request.Method.POST, "http://www.amoflirt.com/android/uploadimage.php", object: Response.Listener { override fun onResponse(response: String) { // Display the first 500 characters of the response string. Log.d("letsSee", "Success! JSON: " + response.toString()) } }, object: Response.ErrorListener { override fun onErrorResponse(volleyError:VolleyError) { Toast.makeText(this@UploadImage, "Some error occurred -> " +...

Android Kotlin crash on Google Nexus P6 I am developing the app on Kotlin. The navigation drawer is working normally on any device. Yet, there is a problem with Google Nexus p6. Furthermore, networking is not also working properly. Are these problems belong to Google Nexus P6 or Kotlin? Following XML code of MainActivity Following code of MainActivity: class MainActivity : BaseActivity(), MainActivityView { @Inject lateinit var presenter: MainActivityPresenterImpl private var...

Cognito log UI stuck on Kotlin Android I am developing a simple web application just to learn Android development using KOTLIN. I am implementing a log in feature using AWS Cognito service. But the app is stuck when I open cognito sign in UI. Please, see my code below. This is my awsconfiguration.json { "Version": "1.0", "CredentialsProvider": { "CognitoIdentity": { "Default": { "PoolId": "xxxx" "Region": "eu-west-2" } } }, "IdentityManager" : { "Default" : { } } } I created an...

Plugin [id: 'org.jetbrains.kotlin.jvm', version: '1.2.71'] was not found in any of the following sources I have a fresh install of IntelliJ, I created a new kotlin gradle project using the following settings: This produces the following build.gradle.kts, (the exact same file works on my Windows machine): import org.jetbrains.kotlin.gradle.tasks.KotlinCompile plugins { kotlin("jvm") version "1.2.71" } group = "com.test" version = "1.0-SNAPSHOT" repositories { mavenCentral() } dependencies {...

Kotlin - can't import java.util in VSCode I've recently moved from WebStorm to VSCode for my web development and seeing how well this editor works and feels I thought I would try using it for Kotlin as well. I've created a demo project in which I've imported a java class, only to get this error main.kt113: error: unresolved reference: util import java.util.*; ^ Initially I've thought it was some configuration that I've missed doing since IntelliJ is knows to do some auto-configuration based on the project type,...

Mocking OffsetDateTime.now with mockk Trying to mock OffsetDateTime.now() with mockk, but it throws Missing calls inside every { ... } block I tried: staticMockk().mock().run { val mockTime = OffsetDateTime.now() every { OffsetDateTime.now() } returns mockTime // test } Also tried: mockkStatic(OffsetDateTime::class) val mockTime = OffsetDateTime.now() every { OffsetDateTime.now() } returns mockTime

Rapid, low power/cpu string matching in Android I'm working on an app that takes voice input, and matches that input to known items in a manifest. Each item in the manifest has a list of aliases, so that items with long titles can be matched to shorter names. For example: class Product { itemname: "Old Stinky's Western Kentucky Big Rig Polish", aliases: ["old stinky", "other alias"] } And then loaded into memory as: public List Collection; Collection.Add(alltheproducts); And then matched through: public String...

What are the parameters for AlertDialog.Builder()? So I am working on creating my first test app using Android Studio and Kotlin. Also, should I just not use Kotlin when developing apps? I was told to use Kotlin.. Anyways back to my problem. I wanted to know what the parameters were for AlertDialog.Builder(this) I know it's supposed to be this or this@mainactivity but I don't know what the parameter is. There is no intellisense and I couldnt find any documents.

kotlin recyclerview display sqlite parent and child table data Our question is about database design or how to view a parent table and child table in a recyclerview widget? This is the view we want PRODUCE tomatoes avocados LIQUOR beer The Department table model looks like this IT IS THE PARENT class ViewDeptModel { var idD:Int = 0 var dept:String = "" } The Item table model is the same IT IS THE CHILD class ViewItemModel { var idI:Int = 0 var item:String = "" } So to view the data in the recyclerview we thought about using this model...

Kotlin - specify type explicitly in IntelliJ after extracting a variable shortcut When coding in Java (and Kotlin!) in Intellij, I usually extract variables/fields from the expression that they are being assigned. In other words, if I want to write the following code in Kotlin: val name = getMyString() Then I would write getMyString, highlight it and extract the variable using a keyboard shortcut. Nice and simple. But let's say I want the value type to be shown explicitly, meaning: val name: String = getMyString() If I use variable extraction, IntelliJ will...

Android specific find object by matching properties in a collection on predicate I have a collection of 10,000 objects that have two properties: a string and a string[] class Product { String name; String[] aliases; } Each object is roughly 64 bytes, so we're looking at under a megabyte in memory for the whole collection, which seems manageable for Android to search in memory. I want an exact match to either the single string, or any string in the array, and to then return the name property of the object. However, android has some restrictions on Lambdas and...

change text color and size of a ListView in kotlin how I can change text color and size of a ListView without use custom adapter.. by kotlin language in android studio.

Kotlin: Dynamically create return type I am really new to Kotlin and mostly coded in Javascript but I'm looking to see if I can dynamically create types while maintaining the static analysis. This is what I'm looking to achieve. class TestOne { def one(){ print('function one'); } } class TestTwo { def two() { print('function two'); } } workItOut("TestOne").one() // prints "function one" workItOut("TestTwo").two() // prints "function two" The workItOut function will take the...

Progress bar limit 0..100 can't define with MediaPlayer.currentposition I have a progress bar (from library in github called audiowave_progressView) which I wanna connect with mediaplayer but the problem is the progressbar limit is from 0 to 100 not more so I can't connect with the mediaplayer so any idea ?? here is the library wave_progress here is my code :- var audiowaveview :AudioWaveView = findViewById(R.id.wave) var mediaplayer :MediaPlayer mediaplayer=...

What's wrong with this Kotlin FileFilter? I have the following FileFilter in my Kotlin Android app: fileArray = fileDirectory.listFiles { file, filename -> file.length() > 0 && filename.matches(fileMatcherRegex) } It filters correctly on the filename matcher but it doesn't filter out files that have a length of 0. It I later iterate through fileArray and log the length of every file, I can sees lengths of 0. Oddly, if I change the file.length() > 0 to, say, file.length() > 999999999999, it filters out all the files, so the...

Kotlin convention for variable name - XML lower case underscore style or Java camelcase? I'm wondering which style should be used with Kotlin variables as they can be accessed directly from XML. It seems to me there may be a conflict of conventions, as Java recommends camelCase but XML files are usually named using lower case and underscore? Should I have something like this: and tv_dialog_title.text = "my text" Or and tvDialogTitle.text = "my text" PS: Similar to this question <a...

Why calendar.add() return 31/9/2018 I want add 2 days from today (29/9/2018), i use: val calendar = Calendar.getInstance()!! calendar.set(CalendarDay.today().year, CalendarDay.today().month+1, CalendarDay.today().day) calendar.add(Calendar.DAY_OF_MONTH, 2) But when i Log() it, date isn't 1/10/2018, it's 31/9/2018

How to Rebind the Module at secound time called in kodein? I have an android app, its developed in kotlin, also we use kodein dependence for binding the data.When the binding the data first time it will bind correctly but it does not bind second time call. inner class CallmyClass() : MultiDexApplication(), KodeinAware { val diModel = Kodein.Module { bind() with singleton { CryptoCompareExchangeProvider(this@App, instance()) } bind() with singleton { SyncProgressProvider() } bind() with singleton {...

Android - Kotlin - cannot find symbol DataBindingComponent I'm facing this kind of phantom error. I've try many ways to resolve this problem but all doesn't work. I don't know what produce this issue. This is my Error in Build Log : e: /Users/galihlarasprakoso/Projects/Android/surat-kaleng/app/build/generated/data_binding_base_class_source_out/debug/dataBindingGenBaseClassesDebug/out/galihlprakoso/com/SuratKaleng/databinding/ActivityLoginBinding.java17 error: cannot find symbol protected ActivityLoginBinding(DataBindingComponent...

RxJava: concatMap() with zip() gets stuck I have a dummy network data source: fun networkDataSource(): Single { return Single.just((0 until 100).toList()) .delay(150, TimeUnit.MILLISECONDS) } Here is an endless observable. It's main use is that it's calculation should be 'protected', so that it calculates it's single value only once. (Here the value is the 1.) val endless = Observable .just(1) .observeOn(Schedulers.io()) .delay(500, TimeUnit.MILLISECONDS)...

Spring Boot : Kotlin &amp; MongoRepository : Performing a full text search Hi there I am really new to Spring Boot and using Kotlin to learn it (I do Android/iOS professionally etc) I have a basic API setup (Spring Boot, Web, MongoDB etc) and my interface uses MongoRepository I have set up my MongoDB with a full-text index (text1) and sort by score. I am trying to call it in Kotlin now override fun searchResult(search : String): List { val criteria = TextCriteria.forDefaultLanguage() .matchingAny(search) val query = TextQuery.queryText(criteria)...

How to use a mono in another mono that have circular dependency I have a spring boot reactive app. Where I want to implement to create a user if it doesn't already exists. Like this: fun create(userDTO: Mono): Mono { return userDTO.filter { userRepository.existsByNameIgnoreCase(it.username).block() == false } .flatMap { createNewUser(it).then() } .switchIfEmpty(userAlreadyExist()) What I really dislike is that I need to use .block() inside the filter. Is there a better way to do this? The big issue is the circular...

SupportFragmentManager Transaction with custom animation error I have encountered an issue with custom animations on SupportFragmentManager Transaction when switching fragments. The code I'm using was working with the deprecated FragmentManager, but given that it is deprecated in Android P, I'm using the support version. val ft = supportFragmentManager.beginTransaction() ft.setCustomAnimations(animationIn, animationOut) ft.hide(mCurrentFragment!!) ft.show(f) ft.commit() mCurrentFragment = f The error is an NPE when a hide custom animation is...

Java or Kotlin ? for android and overall which language is better for actual beginner ? [on hold] I am beginner in this core field of programming I know HTML, CSS, JS, and PHP Wordpress front end so I am moving forward with new technologies so which language is better to start from scratch .Java or Kotlin ? as a android programmer ! I already started Java but after launch of Java 11 with licences terms , due to Law suite win by Oracle there maybe some problem in near future to distribute or work for commercial software . they clearly mention that we cant use it for commercial.

How does this Kotlin class creating works Just learning Kotlin In the first code down below there is the val keyword right in the other code there is not, what is the default here if the val and var is omitted? class Person(val firstName: String, val lastName: String) { } class Person(firstName: String, lastName: String) { }

How to hide footer in RecyclerView Adapter? I want to add footer with empty layout to the bottom of the recyclerView which will show up only if certain View is visible on screen(In my case FabButton). FabButton is overlapping my last RecyclerView item, so I want to add empty Footer to the bottom of the recyclerview if this FabButton is visible. ViewHolder inside Adapter for Footer: inner class FooterViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) Inside onBindViewHolder: ... ViewHolder above is for items. else...

Use annotation processor in kotlin I have a simple annotation in my processor like following: import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Target(ElementType.TYPE) @Retention(RetentionPolicy.CLASS) public @interface BundleBuilder { // ... } This works in java files but as soon as I convert my file to kotlin, the import of the annotation is not working anymore. Why? <a...

Plotting a Graph in Kotlin using JSON string I am able to pull data from JSON through Kotlin. The output is stored in a variable userdetails. I am not able to plot graph using this data in Kotlin. A line or Bar graph works for me. var userdetails=[{"userdate":"2018-09-15","usercount":"23"},{"userdate":"2018-09-16","usercount":"23"},{"userdate":"2018-09-17","usercount":"24"},{"userdate":"2018-09-23","usercount":"25"}]