kotlin-interop

问题 I need to disable @NonNull/@Nullable annotations in Kotlin generated Java code because some annotation adapters (code generators) cant handle properly some annotated fields Do you know how it could be done? Some Kotlin annotation or compilator directive Problem: kotlin class: open class TestModel( var test: ByteArray = ByteArray(0) ) generated java: public class TestModel { @org.jetbrains.annotations.NotNull() private byte[] test; @org.jetbrains.annotations.NotNull() public final byte[]

问题 This is a general question. Let's say I have an extension function written in kotlin which converts DP to PX and return a NonNull Int fun Int.toPx() { /** implementation */ } The function in java will look something like this public int toPx(int $receiver) { /** implementation */ } In my opinion the $receiver makes the Java-interop feels generated and uninviting. I know that you can use the @JvmName annotation with some combinations like @file:JvmName to change the name in java. When i'm

问题 What is the difference between: definition 1 data class Person (var name:String, var age:Int) definition 2 class Person (var name:String, var age:Int) definition 3 class Person (){ var name:String = "" var age:Int = 1 } In the 3 cases when i use the autocomplete i saw the same methods availables like a POJO... is the same but 3 differents ways? 回答1: Difference in equals , hashCode , & toString the most important difference between definition 1 and definitions 2 & 3 is that in definition 1 ,

问题 I have a WebView. I want to call public void evaluateJavascript(String script, ValueCallback<String> resultCallback) this method. Here is the ValueCallback interface: public interface ValueCallback<T> { /** * Invoked when the value is available. * @param value The value. */ public void onReceiveValue(T value); }; Here is my kotlin code: webView.evaluateJavascript("a", ValueCallback<String> { // cant override function }) Anyone have idea to override the onReceiveValue method in kotlin? I tried

问题 Let's say I have particular code in old/legacy Java library: public class JavaClass { private String notNullString; private String nullableString; private String unannotatedString; public JavaClass(@NotNull String notNullString, @Nullable String nullableString, String unannotatedString) { this.notNullString = notNullString; this.nullableString = nullableString; this.unannotatedString = unannotatedString; } @NotNull public String getNotNullString() { return notNullString; } @Nullable public

问题 I'm trying to use cocoapods framework in Kotlin Multiplatform project. So I added framework to Pods file. ran pod install. created .def file added cinterop config in build.gradle ./gradlew cinteropFirebaseIos runs successfully. It generates .klib so I can see classes in kotlin code. But when I'm trying to run iOS app build fails with message: Showing Recent Messages > Task :app:linkDebugFrameworkIos ld: framework not found FirebaseDatabase /Applications/Xcode.app/Contents/Developer/Toolchains

问题 I'm trying to use dagger 2 on my Android application to inject the new ViewModel from arch android library. From what I see on this sample https://github.com/googlesamples/android-architecture-components/tree/e33782ba54ebe87f7e21e03542230695bc893818/GithubBrowserSample I need to use this: @MustBeDocumented @Target(AnnotationTarget.FUNCTION, AnnotationTarget.CONSTRUCTOR, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER) @Retention(AnnotationRetention.RUNTIME) @MapKey internal

问题 I'm trying to use dagger 2 on my Android application to inject the new ViewModel from arch android library. From what I see on this sample https://github.com/googlesamples/android-architecture-components/tree/e33782ba54ebe87f7e21e03542230695bc893818/GithubBrowserSample I need to use this: @MustBeDocumented @Target(AnnotationTarget.FUNCTION, AnnotationTarget.CONSTRUCTOR, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER) @Retention(AnnotationRetention.RUNTIME) @MapKey internal

问题 Can I have serializable lambda in Kotlin? I am trying to use Jinq library from Kotlin, but it requires serializable lambdas. Is there any syntax that makes it possible? Update: My code: var temp=anyDao.streamAll(Task::class.java) .where<Exception,Task> { t->t.taskStatus== TaskStatus.accepted } .collect(Collectors.toList<Task>()); I am getting this error: Caused by: java.lang.IllegalArgumentException: Could not extract code from lambda. This error sometimes occurs because your lambda

问题 I often use UUID.randomUUID() . Type inferred by kotlin is UUID! . is there any way to tell kotlin that return type of this specific method is UUID and is always non null? or do i have to do everywhere UUID.randomUUID()!! or implement my own method? 回答1: If you explicitly declare the types, it should declare them non-nullable instead of as a platform type. val id1 = UUID.randomUUID() // UUID! val id2: UUID = UUID.randomUUID() // UUID I do this with a function to make things a bit easier. By