kotlin

问题 I used Kotlin with Spring boot and i met some errors about bean creation. error message was Index 0 out of bounds for length 0 in spring framework class i dont understand why caused exception about this java code(spring) for (int paramIndex = 0; paramIndex < paramTypes.length; paramIndex++) { Class<?> paramType = paramTypes[paramIndex]; String paramName = (paramNames != null ? paramNames[paramIndex] : ""); // Here! ... } is that possible? anyway, i want to know how create spring bean as

问题 I ran into a problem while coding in Kotlin. I copy-pasted a java code sample that converts DP to Pixels, in order to place it as a parameter for setting padding programatically. I was expecting the IDE to automatically transform it all to Kotlin, however it failed in the process. The code in Java looks like the following: float scale = getResources().getDisplayMetrics().density; int dpAsPixels = (int) (sizeInDp*scale + 0.5f); After the translation to Kotlin : val scale = resources

问题 I want to set dynamically a backgroundColor to a text view in a RecyleView, and thus not all my item will have the same background color for their tag. This is the pseudo code I'd like to use : val name = item.type.toLowerCase() color = ContextCompat(item.context, R.color[name]) But this syntax does not seem to work in Kotlin, and I really have no idea how to fetch the color value from the resource depending on the type of the item. I also tried this: val lowerType = pokemon.type.toLowerCase(

问题 Problem I have been working on a Flutter Plugin for the Radar SDK, however, I am unable to programmatically set my BroadcastReceiver. This works, but I cannot access my EventChannel When I set my Receiver in the android Manifest of the plugin, the receiver is called properly. The manifest can be seen below: <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.yourorg.appname"> <application android:name="io.flutter.app.FlutterApplication"> <receiver android:name="

问题 I have a json I fetch from an API that looks like this: {"success":true,"message":"","result":{"Bid":6886.97100000,"Ask":6891.58500000,"Last":6891.58500000}} All I want is to just save Bid and Ask values in fields of a class. First I parse whole json like this: val response = sendRequest(url)) val gson = Gson() val ticker : MarketTickerEntity = gson.fromJson(response, MarketTickerEntity::class.java) And then I try to parse it inside of my class init block and reassign to bid and ask fields.

问题 Ive had a look at this question but as of the time i typed this question, there aren't any answers with Kotlin code. in my colours.xml file how would i access colours like these for example using a string? <resources> <!-- Orange --> <color name="orangePrimary">#f6a02d</color> <color name="orange1">#e3952a</color> <color name="orange2">#da8f28</color> <color name="orange3">#d08926</color> </resources> The Java version is apparently this int desiredColour = getResources().getColor(getResources

问题 I recently made a simple user input code in kotlin and I tried to run it on intellij Idea, but it didn't work properly, when I ran the code, the "Enter text" part showed up and I can type some words, but the readLine() didn't seem to work as it doesn't continue to the last println statement. this is the contents of my main.kt file fun main(args: Array<String>) { print("Enter text: ") val stringInput = readLine()!! println("You entered: $stringInput") } here is the contents of my build.gradle

问题 I have created a custom layout for authentication, but the layout is not shown and Email login screen is displayed instead val customLayout = AuthMethodPickerLayout.Builder(R.layout.custom_signinbasic) .setPhoneButtonId(R.id.buttonPhone) .setEmailButtonId(R.id.buttonEmail) .build() startActivityForResult( AuthUI.getInstance().createSignInIntentBuilder() .setAuthMethodPickerLayout(customLayout) .build(), Signin_Request_Code) Layout <androidx.constraintlayout.widget.ConstraintLayout xmlns

问题 I created a new project and getting following Gradle Sync error. Gradle 'ProjectX' project refresh failed Error: Cannot find JAR 'kotlin-compiler-embeddable-1.1.3-2.jar' required by module 'gradle-kotlin-dsl' using classpath or distribution. I am not using 'Kotlin' and using Android 4.0(IceCreamSandwich). Below is my build.gradle buildscript { repositories { google() jcenter() } dependencies { classpath 'com.android.tools.build:gradle:3.0.0' // NOTE: Do not place your application dependencies

问题 Is there any difference in these two ways? I've been using the seond way and it works so far, yet I found the first way upon reading tutorial articles. 1st: class FlowersAdapter(private val onClick: (Flower) -> Unit) : ListAdapter<Flower, FlowersAdapter.FlowerViewHolder>(FlowerDiffCallback) { /* ViewHolder for Flower, takes in the inflated view and the onClick behavior. */ class FlowerViewHolder(itemView: View, val onClick: (Flower) -> Unit) : RecyclerView.ViewHolder(itemView) { private val