操纵导航图参数

Question

我使用Android导航图并发送参数。下面是我获取这些参数的方法：

val args: MyFragmentArgs by navArgs()

var args: MyFragmentArgs? by navArgs()

override fun onStart() { // Need to do this in onStart
    useMyArgsOnFirstTimeOpen(args.myObject)
    args = null
}

// want to enable either of these
args = null
args.myObject = null

@MainThread
inline fun <reified Args : NavArgs> Fragment.navArgs() = NavArgsLazy(Args::class) {
    arguments ?: throw IllegalStateException("Fragment $this has null arguments")
}

或者解决方案是：将args中传递的对象更改为支持清除它的类？IE：

args.myObject.clear() // wish to avoid this

Answer 1

您可以使用：

lateinit var args: MyFragmentArgs by navArgs()

然后初始化变量

override fun onStart() { // Need to do this in onStart
  args = null
  useMyArgsOnFirstTimeOpen(args.myObject)
}