kotlin

问题 I want to use Toolbar Animation with Android Design Support Library.I used this information to do this: this link I configured my activity.xml file. But I got those errors: The following classes could not be found: - android.support.design.widget.AppBarLayout (Fix Build Path, Edit XML, Create Class) - android.support.design.widget.CollapsingToolbarLayout (Fix Build Path, Edit XML, Create Class) - android.support.design.widget.CoordinatorLayout (Fix Build Path, Edit XML, Create Class) -

问题 For a @ManyToOne relation in JPA entity I'm only interested in the actual id reference, not to fetch the whole model associated with the relation. Take for example these Kotlin JPA entities: @Entity class Continent( @Id var id: String, var code: String, var name: String ) : Comparable<Continent> { companion object { private val COMPARATOR = compareBy<Continent> { it.id } } override fun compareTo(other: Continent): Int { return COMPARATOR.compare(this, other) } } @Entity class Country( @Id var

问题 I want to create a lambda and assign it to a variable and the following works as expected: val rollDice = { min: Int, max: Int -> (min..max).random() } However, when I tried to assign default values to the parameters I got an error: val rollDice = { min: Int = 1, max: Int = 12 -> (min..max).random() } ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Unexpected tokens (use ';' to separate expressions on the same line) Is it not possible to assign default values to parameters in lambda

问题 I want to create a lambda and assign it to a variable and the following works as expected: val rollDice = { min: Int, max: Int -> (min..max).random() } However, when I tried to assign default values to the parameters I got an error: val rollDice = { min: Int = 1, max: Int = 12 -> (min..max).random() } ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Unexpected tokens (use ';' to separate expressions on the same line) Is it not possible to assign default values to parameters in lambda

问题 By default, ThreeTenABP.LocalDateTime is converted to {"date":{"day":10,"month":4,"year":2018},"time":{"hour":3,"minute":34,"nano":115000000,"second":18}} I can write an adapter to support ISO date string 2018-04-10T03:45:26.009 class LocalDateTimeAdapter { @ToJson fun toJson(value: LocalDateTime): String { return FORMATTER.format(value) } @FromJson fun fromJson(value: String): LocalDateTime { return FORMATTER.parse(value, LocalDateTime.FROM) } companion object { private val FORMATTER =

问题 I was trying to implement HasActivityInjector in my android application but it's showing me HasActivityInjector cann't be resolved. Below dependencies and plugin I have used in my project- apply plugin: 'kotlin-kapt' and implementation 'com.google.dagger:dagger:2.16' kapt 'com.google.dagger:dagger-compiler:2.16' Here is the code I am trying - class RanoBoilerplateApplication : Application(), HasActivityInjector{ @Inject lateinit var activityDispatchingAndroidInjector:

问题 I was trying to implement HasActivityInjector in my android application but it's showing me HasActivityInjector cann't be resolved. Below dependencies and plugin I have used in my project- apply plugin: 'kotlin-kapt' and implementation 'com.google.dagger:dagger:2.16' kapt 'com.google.dagger:dagger-compiler:2.16' Here is the code I am trying - class RanoBoilerplateApplication : Application(), HasActivityInjector{ @Inject lateinit var activityDispatchingAndroidInjector:

问题 I have an Enum class RoleType public enum RoleType { SYSTEM_ADMIN, PROJECT_ADMIN, USER; } In my User entity class, I've the following mapping for the enum collection. This is the Java code: @JsonProperty @ElementCollection @Enumerated(EnumType.STRING) @CollectionTable(name = "user_role", joinColumns = @JoinColumn(name = "user_id")) private Set<RoleType> roles; I converted this User entity class to Kotlin and here is the code: @JsonProperty @Enumerated(EnumType.STRING) @ElementCollection

问题 I have an Enum class RoleType public enum RoleType { SYSTEM_ADMIN, PROJECT_ADMIN, USER; } In my User entity class, I've the following mapping for the enum collection. This is the Java code: @JsonProperty @ElementCollection @Enumerated(EnumType.STRING) @CollectionTable(name = "user_role", joinColumns = @JoinColumn(name = "user_id")) private Set<RoleType> roles; I converted this User entity class to Kotlin and here is the code: @JsonProperty @Enumerated(EnumType.STRING) @ElementCollection

问题 I'm trying to test my UI via instrumentation test, with androidX espresso library. In my grade I have: apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-android-extensions' apply plugin: "kotlin-kapt" android { compileSdkVersion 28 defaultConfig { applicationId "it.zehus.mybike" minSdkVersion 21 targetSdkVersion 28 versionCode 1 versionName "1.0" testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" android.defaultConfig