Navigation DialogFragment展示dialog

在nav_config中
<fragment
        android:id="@+id/fragment_crime_detail"
        android:name="com.example.criminalintent.CrimeFragment">
        <action
            android:id="@+id/to_fragment_dialog"
            app:destination="@id/fragment_dialog"/>

    </fragment>

    <fragment
        android:id="@+id/fragment_dialog"
        android:name="com.example.criminalintent.DatePickerFragment">

    </fragment>

class DatePickerFragment:DialogFragment() {
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        super.onCreateDialog(savedInstanceState)
        val calendar = Calendar.getInstance()
        val initYear = calendar.get(Calendar.YEAR)
        val initMonth = calendar.get(Calendar.MONTH)
        val initDay = calendar.get(Calendar.DAY_OF_MONTH)

        return DatePickerDialog(
            requireContext(),
            null,
            initYear,
            initMonth,
            initDay
        )
    }
}

findNavController().navigate(R.id.to_fragment_dialog)