转到android Kotlin中的下一个活动；未解决的课程参考 [英] Go to next activity in android Kotlin; Unresolved class reference

问题描述

我正在尝试使用按钮监听器进行下一个活动，它显示为unresolved reference java 这是我的代码:

I am trying to go to next activity with my button listener and it says unresolved reference java Here is my code:

btn?.setOnClickListener(object: View.OnClickListener {
      override fun onClick(view: View): Unit {
         val intent = Intent(this@MainActivity,NextActivity::class.java)
            Toast.makeText(this@MainActivity,"helllo",Toast.LENGTH_LONG).show()
         }
      })

注意:这里的NextActivity也是kotlin文件.

NOTE: Here the NextActivity is also a kotlin file.

图片中显示的错误

推荐答案

尝试将Kotlin升级到最新版本，或在stdlib依赖项下方添加对kotlin-reflect的引用(如下所示):

Try to either upgrade Kotlin to the lastest version, or add a reference to kotlin-reflect below the stdlib dependency (will look like this):

compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"

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