运行错误； 运行错是程序可以执行，但是在执行过程中发生异常，提前退出程序。最常见的是指针越界，打开...
当你不需要的时候，你不应该把你的依赖注入到Activity构造函数中。看一下this文章，对于这种情况，你必须...
Theno-argcompiler plugin generates an additional zero-argument constructor for classes with a specific annotation. The generated constructor is synthetic so it can’t be directly called from Java or Kotlin, but it can be called using reflection. You can see motivating discussionhere. How to use ...
Android ViewModel has no zero argument constructorstackoverflow.com/questions/4…For lifecycle_version = '2.2.0' ViewProviders.of API is deprecated . It`s my situation :class MainActivityViewModel(application: Application) : AndroidViewModel(application) { private var repository: UserRepository val ...
No-arg compiler plugin The no-arg compiler plugin generates an additional zero-argument constructor for classes with a specific annotation. The generated constructor is synthetic so it can’t be directly called from Java or Kotlin, but it can be called using reflection. ...
The no-arg compiler plugin generates an additional zero-argument constructor for classes with a specific annotation. The generated constructor is synthetic so it can’t be directly called fromJavaor Kotlin, but it can be called using reflection. This allows the Java PersistenceAPI(JPA) to instanti...
{test.firstProperty}") test.testVal } // Kotlin has a concise syntax for declaring properties and initializing them from the primary constructor: class Person(val firstName: String, val lastName: String, var age: Int) // Such declarations can also include default values of the class ...
ufoscout/properlty - Simple configuration library with placeholders resolution and zero magic! mariomac/kaconf - KickAss Configuration. An annotation-based configuration system for Java and Kotlin jdiazcano/cfg4k - Flexible and easy to use config library written in kotlin. config4k/config4k - A ...
hasSpace()) println(str2.hasSpace()) println(str2.isEmptyStr) // println(str3.isEmpty) // not allowed println(str3.firstChar) } 泛型generic 泛型的定义 用T 来指代类型,T 的实质定义为 T: Any? ,即可以为 null 的 Any 类型 如果不允许 null,在泛型定义中用 T: Any 如果只允许特定类型...
A class always has a primary constructor. If you don’t provide one, then Kotlin provides one that doesn’t accept any parameters. However, you can also specify a constructor in the following way: class Rectangle(height: Int, width: Int) { var Height: Int = height var Width: Int = wi...