期待在科特林声明成员 [英] Expecting member declaration in Kotlin

问题描述

我想在构造函数中分配我的类变量，但出现错误，期望成员声明

I want to assign my class variable in constructor but I get an error expecting member declaration

 class YLAService {


var context:Context?=null

class YLAService constructor(context: Context) {
    this.context=context;// do something

}}

推荐答案

在Kotlin中，您可以像这样使用构造函数:

In Kotlin you can use constructors like so:

class YLAService constructor(val context: Context) {

}

更短:

class YLAService(val context: Context) {

}

如果您想先进行一些处理:

If you want to do some processing first:

class YLAService(context: Context) {

  val locationService: LocationManager

  init {
    locationService = context.getService(LocationManager::class.java)
  }
}

如果您真的想使用辅助构造函数:

If you really want to use a secondary constructor:

class YLAService {

  val context: Context

  constructor(context: Context) {
    this.context = context
  }

}

这看起来更像Java变体，但更冗长.

This looks more like the Java variant, but is more verbose.

请参见关于构造函数的Kotlin参考.

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