android - 如何从Kotlin的内部类调用 fragment 方法？

Question

我在片段中创建了一个方法和一个内部类。但是在Fragment的内部类中无法访问外部类方法？如何在片段的内部类中调用外部类方法或成员。下面是我的代码:

class BlankFragment : Fragment() {

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    mOrientationListener = OrientationChangeListener(requireContext())

}

fun rotateUI(orientation: Int){
    /// something
}

/**
 * This callback returns rotation angle of the phone, to make it return orientation angles enable it on onStart and disable it onPause
 */
private var mOrientationListener: OrientationChangeListener? = null

internal class OrientationChangeListener (context: Context?) : OrientationEventListener(context) {
    /**      portrait
     * (0, 359)
     *
     * (270)            (90)
     * (land)           (land)
     */
    override fun onOrientationChanged(orientation: Int) {

            // this method is inaccessible
            //rotateUI(orientation)
    }
}}

Answer 1

对于内部类，关键字应该是内部而不是内部，然后您可以使用它来访问方法:-

this@BlankFragment.rotateUI