https://stackoverflow.com/questions/40277991/kotlin-how-to-check-if-the-field-is-nullable-via-reflection#40278279 Translation: You can check nullity with a flag. https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-type/is-marked-nullable.html ♪Next codeclass MyClass(val nullable: Long?, val notNullable: MyClass) MyClass::class.declaredMemberProperties.forEach { println("Property $it isMarkedNullable=${it.returnType.isMarkedNullable}") } Impress:Property val MyClass.notNullable: stack.MyClass isMarkedNullable=false Property val MyClass.nullable: kotlin.Long? isMarkedNullable=true Extract from the documentation.For Kotlin types, this means that null is allowed for the presentation of types. In practice, this means that the types will be defined with a familiar question (?at the end. For non-Kotlin types, it means that the type or symbol to be defined with that type is marked with annotation of the type javax.annotation. Nullable♪What matters is that even if isMarkedNullable Come back. false, type values can still be null♪ It could happen if the type is a type of parameter:fun <T> foo(t: T) { // isMarkedNullable == false for t's type, but t can be null here } It also needs to be borne in mind that the field can be marked as NotNull, but it can still have zero value (as I understand it is due to problems with cotlin and other JVM languages).

♪ https://kotlinlang.org/docs/reference/equality.html indicated that === is the operator of comparison of references to the facilitya == b analog of simple challenge of method a.equals(b)

That's what just came to mind.Put an extension on java class enum-a. fun <T : Enum<*>> Class<T>.enumByCode(code: Int): T { for (value in this.enumConstants) { if (code == value.ordinal) return value } return this.enumConstants[0] } The only thing is to determine what to return as a default point. I have the highest value of every enum. One last thing. But you can do that. enum class Unknown { UNKNOWN } fun <T : Enum<*>> Class<T>.enumByCode(code: Int): T { for (value in this.enumConstants) { if (code == value.ordinal) return value } return Unknown.UNKNOWN as T }

If I understand correctly, you're trying, in a static way, to turn to a non-static variable/method that goes into a descendant class. It won't work. The only solution I see is to define a field of static and, in the initialization of a class-outcome, to give it meaning.object Demo { protected var value:String @BeforeClass fun setUp() { println(value) } @AfterClass fun destroy() { } } internal class SubClass:Demo() { companion object { init { Demo.value = "this is value" } } }

Found out of what it didn't work for just magic) When they added three elements and one of them Switch Changed the condition(s) and closed the screen to the end of the other bruises or accepted the same condition as the first scroll.[1] or it became the other.[2] With a lot of time, I realized that the model somehow changed the variable. isEnable placed in it true[2] or false[1] Depending on developments, although this variable was privatized and the grid did not have a standard name. Replacement boolean ♪ int and then transform it back into boolean All earned.

Anko is the same version through xml, only in another format, where you write in the descriptive language, here in the form of a code, the result is the same and equal opportunities.You can continue to use the classic for Android xml-verst and in writing on Kotlin, Anko is just an alternative tool, not an obligatory condition for UI on Kotlin. I personally believe that UI should be in the descriptive language (XML). First, it shares the business logic and design of the individual. Then the xml-page can be pre-evaluated in a visual editor, and there are all viewing attributes in the form of a table and working with it much more comfortable than the code.As far as you're right, you're doing the same thing in the xml cross, just write in another format, that's the right thing.For binding, there's this official binding support in XML: https://developer.android.com/topic/libraries/data-binding/index.html the instrument is more powerful than Anko, although I honestly didn't deal with Anko, I don't like it.

API has a restriction on the line, so it's too often that you can't make requests:The API InContact (except the methods of sections secure and ads) with the user &apos; s key can be accessed at least 3 times per second.See. "Restrictions and recommendations" https://vk.com/dev/api_requests

Modern syntaxis uses a limited volume literal:@Entity @Table(name = "t_payment") data class PaymentEntity( @ManyToOne(cascade = [CascadeType.DETACH]) @JoinColumn(name = "user_id", nullable = false) var user: User? = null) { }

We need to add. apply plugin: 'kotlin-android-extensions' build.gradle your module

Convert Java File to Kotlin File must be implemented. This can be done in several ways:Implementing Find Action. Ctrl+Shift+A And we'll find the name of action.It's also available in the menu "Code ция Convert Java File to Kotlin File."Of course you have to. https://plugins.jetbrains.com/plugin/6954?pr=androidstudio or use Intellij IDEA 15, where this flame is provided https://www.jetbrains.com/idea/whatsnew/#kotlin

_Because both Kotlin and Java gather on one common platform, binary and other compatibility is important as the language of the project.I think it's important from the employer's point of view that you can work on the team, and then knowing Java will help you much more than knowing Kotlin: with all his benefits, he's much less popular, and, accordingly, much less likely that you will find yourself a place where Kotlin will be used. It's only critical if you and nobody work on your part of the project after or before you, but it's rare.Well, if you know for sure that you' work only where the Kotlin is used, there's no question.

Transfer the parameters to the request through the arguments of the method:@Query("SELECT * FROM table_name where id = :variableName") fun getDataById(variableName: Int) : Single<DataClass>

The problem is Tomcat9 error, use Http11Nio2 Protocol in, then there's no problem with downloading files.

https://core.telegram.org/bots/api#getme Simple method of testing the token of your bot authentication. No parameters. Returns basic information on the target https://core.telegram.org/bots/api#user ♪Field username - Name of user or beansimport telebot bot = telebot.TeleBot(bot_token) print(bot.get_me()) print(bot.get_me().username) bot.polling(none_stop=True) >>> {'id': 99**66, 'is_bot': True, 'first_name': 'example', 'username': 'example_bot', 'last_name': None, 'language_code': None, 'can_join_groups': True, 'can_read_all_group_messages': False, 'supports_inline_queries': False} >>> example_bot

You may need to use sockets, as passer and kotlin application will be launched by an operating system in different processes. https://ktor.io/docs/servers-raw-sockets.html#client https://docs.python.org/3/library/socket.html

That's how your code looks.viewModel.priceList.observe(lcowner, { Scaffold( content = { CryptoContent(it) }) }) You can't show data that's not yet available.

When you move into the second fragment, View is destroyed in the first fragment, and when you return to the first, you'll have a View again, those are caused. onCreateView♪ onViewCreated and mAllInfoApex.getAllInfoApexFromAPI respectively. That's probably the point. One of the solutions is to shift the challenge. getAllInfoApexFromAPI Total init block block block ViewModel

matches Compars the whole line.You need to use it. containsMatchIn

val res = (n1 >= n2 && n1 <=n3) || (n1 <= n2 && n1 >= n3)

It? Looks weird, maybe I don't get it.class FlowListInputStream( private val flow: Flow<List<ByteArray>> //размер списка до нескольких тысяч ) : InputStream() { val s by lazy { val streams = runBlocking { flow.first() }.map { ByteArrayInputStream(it) } SequenceInputStream(Vector(streams).elements()) } override fun read(): Int = s.read() }