DialogFragment忽略OnBackPressedDispatcher

谷歌开发人员真的很难理解。总之,我找到了一个不使用接口的解决方案。

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return object : Dialog(requireContext(), theme) {
        override fun onBackPressed() {
            // handle back press
        }
    }
}

只需覆盖onCreateDialog,并覆盖其中的onBackPressed。

我找到了一个解决方案,但我希望库能处理好这个用例。

BottomSheetDialog :

class BackPressBottomSheetDialog(context: Context, @StyleRes theme: Int, 
private val callback: BackPressBottomSheetDialogCallback) :
        BottomSheetDialog(context, theme) {

    override fun onBackPressed() {
        if (callback.shouldInterceptBackPress()) callback.onBackPressIntercepted()
        else super.onBackPressed()
    }
}

而它 interface

interface BackPressBottomSheetDialogCallback {
    fun shouldInterceptBackPress(): Boolean
    fun onBackPressIntercepted()
}

BottomSheetDialogFragment

private val dialogCallback = object : BackPressBottomSheetDialogCallback {
      override fun shouldInterceptBackPress(): Boolean {
        //TODO should you intercept the back button?
      }

      override fun onBackPressIntercepted() {
        //TODO what happens when you intercept the back button press
      }
}

override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
    return BackPressBottomSheetDialog(requireContext(), theme, dialogCallback)
}