android - 为什么我不能在 Kotlin 中为 int var 设置 Lateinit ？

Question

这个问题已经有答案了:

Why doesn't Kotlin allow to use lateinit with primitive types? (3 个回答)

已关闭 4 年前。

我希望稍后初始化私有(private)a var id，所以我使用代码private lateinit var id:Int

但是我收到错误原始类型的属性不允许使用“lateinit”修饰符，为什么？我该如何修复它？谢谢!

代码A

class UIAddEditBackup: AppCompatActivity() {
    private lateinit var mContext: Context //OK
    private var isAdd: Boolean=false //OK
    private lateinit var id:Int   // I get the error

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.layout_add_edit_backup)
        id=5
    }
}

Answer 1

Normally, properties declared as having a non-null type must be initialized in the constructor. However, fairly often this is not convenient. For example, properties can be initialized through dependency injection, or in the setup method of a unit test. In this case, you cannot supply a non-null initializer in the constructor, but you still want to avoid null checks when referencing the property inside the body of a class.

对于 primite 类型，您只需删除 lateinit 修饰符并使用零(或 bool 值 false)进行初始化