java.lang.IllegalArgumentException:指定为非空的参数为空:方法 kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull [英] java.lang.IllegalArgumentException : Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull

问题描述

我收到此错误

java.lang.IllegalArgumentException:参数指定为非空为空:方法 kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull，参数事件

线

覆盖 fun onEditorAction(v: TextView, actionId: Int, event: KeyEvent)

以下是完整的代码.这段代码最初是在 Java 中编写的，我使用 Android Studio 将其转换为 Kotlin，但现在出现此错误.我尝试重建和清理项目，但没有奏效.

Following is the entire code. This code was originally in java, I converted it to Kotlin using Android Studio, but now I'm getting this error. I tried rebuilding and cleaning the project, but that didn't work.

val action = supportActionBar //get the actionbar
action!!.setDisplayShowCustomEnabled(true) //enable it to display a custom view in the action bar.
action.setCustomView(R.layout.search_bar)//add the custom view
action.setDisplayShowTitleEnabled(false) //hide the title

edtSearch = action.customView.findViewById(R.id.edtSearch) as EditText //the text editor


//this is a listener to do a search when the user clicks on search button
edtSearch?.setOnEditorActionListener(object : TextView.OnEditorActionListener {
    override fun onEditorAction(v: TextView, actionId: Int, event: KeyEvent): Boolean {
    if (actionId == EditorInfo.IME_ACTION_SEARCH) {
         Log.e("TAG","search button pressed")  //doSearch()
         return true
        }
     return false
    }
})

推荐答案

最后一个参数可以是 null，如文档:

The last parameter can be null, as described by the docs:

KeyEvent:如果由回车键触发，则为该事件；否则，这是空的.

KeyEvent: If triggered by an enter key, this is the event; otherwise, this is null.

所以你必须做的是让 Kotlin 类型可以为空来解决这个问题，否则注入的 null 检查会让你的应用程序在收到带有 null 您已经看到的价值:

So what you have to do is make the Kotlin type nullable to account for this, otherwise the injected null check will crash your application when it gets a call with a null value as you've already seen it:

edtSearch?.setOnEditorActionListener(object : TextView.OnEditorActionListener {
    override fun onEditorAction(v: TextView, actionId: Int, event: KeyEvent?): Boolean {
        ...
    }
})

在这个答案中有更多关于平台类型的解释.

More explanation about platform types in this answer.

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