Knowing the Name of Your Main Class Currently (Kotlin since M14 including up to 1.0 betas), to run a Kotlin class you are actually running a special class that is created at the file level that hold your main() and other functions that are top-level (outside of a class or interface). So if your code … Read more
As @AndroidEx correctly stated, assignments are not expressions in Kotlin, unlike Java. The reason is that expressions with side effects are generally discouraged. See this discussion on a similar topic. One solution is just to split the expression and move the assignment out of condition block: a = b if (a != c) { … … Read more
With Jackson Kotlin Module current versions, if you import the full module package or the specific extension function you’ll have all extension methods available. Such as: import com.fasterxml.jackson.module.kotlin.* val JSON = jacksonObjectMapper() // keep around and re-use val myList: List<String> = JSON.readValue(“””[“a”,”b”,”c”]”””) Therefore the Jackson Module for Kotlin will infer the the correct type and … Read more
Jetpack Compose implementation of Material Design 3 includes 4 types of Top App Bars (https://m3.material.io/components/top-app-bar/implementation): CenterAlignedTopAppBar SmallTopAppBar MediumTopAppBar LargeTopAppBar https://developer.android.com/reference/kotlin/androidx/compose/material3/package-summary They all have a scrollBehavior parameter, which can be used for collapsing the toolbar. There are 3 basic types of scroll behavior in the library: TopAppBarDefaults.pinnedScrollBehavior TopAppBarDefaults.enterAlwaysScrollBehavior TopAppBarDefaults.exitUntilCollapsedScrollBehavior https://developer.android.com/reference/kotlin/androidx/compose/material3/TopAppBarDefaults Note: This API is annotated as … Read more
Strange thing, but this question comes in search before the same with right answer Copying it here: import android.support.annotation.IntDef public class Test { companion object { @IntDef(SLOW, NORMAL, FAST) @Retention(AnnotationRetention.SOURCE) annotation class Speed const val SLOW = 0 const val NORMAL = 1 const val FAST = 2 } @Speed private var speed: Int=SLOW public … Read more
Adding @Suppress(“UNCHECKED_CAST”) (also possible through IDEA’s Alt+Enter menu) to any of statement, function, class and file should help. Before: After:
As Mark pointed out on Debop’s answer, you have to configure both compileKotlin and compileTestKotlin. You can do it without duplication this way: tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all { kotlinOptions { jvmTarget = “1.8” } } For a pure Kotlin project, I don’t think the options sourceCompatibility and targetCompatibility do anything, so you may be able to remove them. … Read more
:: is used for Reflection in kotlin Class Reference val myClass = MyClass::class Function Reference this::isEmpty Property Reference ::someVal.isInitialized Constructor Reference ::MyClass For detailed reading Official Documentation
The problem is Android Studio does not automatically update the source link of reference even when the documentation is already downloaded. The default link in jdk.table.xml is http://developer.android.com/reference/ (android studio tries to connect to this online server even if the network is blocked). To solve the problem, we can just redirect the reference to local … Read more
In this particular case you can use a general approach to convert a callback-based API to a suspending function via suspendCoroutine function: suspend fun CameraManager.openCamera(cameraId: String): CameraDevice? = suspendCoroutine { cont -> val callback = object : CameraDevice.StateCallback() { override fun onOpened(camera: CameraDevice) { cont.resume(camera) } override fun onDisconnected(camera: CameraDevice) { cont.resume(null) } override fun … Read more