对话框

// 发起方 (CrimeDetailFragment)
setFragmentResultListener("requestKey") { _, bundle ->
    val result = bundle.getString("selectedDate")
}
 
// 对话框方 (DatePickerFragment) 在用户选完日期后
setFragmentResult("requestKey", bundleOf("selectedDate" to date.toString()))

import { Objectives } from "@/components/mdx/objectives";
import { Term } from "@/components/mdx/term";
import { Callout } from "@/components/mdx/callout";
import { Step, Stepper } from "@/components/mdx/stepper";
import { Answer, Exercises } from "@/components/mdx/exercises";
import { Glossary, GlossaryItem } from "@/components/mdx/glossary";
import { Attribution } from "@/components/mdx/attribution";
import androidx.fragment.app.DialogFragment
import android.app.DatePickerDialog
import java.util.Calendar
 
class DatePickerFragment : DialogFragment() {
 
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val calendar = Calendar.getInstance()
        val year = calendar.get(Calendar.YEAR)
        val month = calendar.get(Calendar.MONTH)
        val day = calendar.get(Calendar.DAY_OF_MONTH)
 
        return DatePickerDialog(
            requireContext(),
            null, // 实现 DatePickerDialog.OnDateSetListener 时设 null
            year, month, day
        )
    }
}

class DatePickerFragment : DialogFragment() {
 
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val calendar = Calendar.getInstance()
 
        return DatePickerDialog(
            requireContext(),
            { _, year, month, day ->
                val resultDate = GregorianCalendar(year, month, day).time
                val resultBundle = Bundle().apply {
                    putSerializable(KEY_DATE, resultDate)
                }
                setFragmentResult(REQUEST_KEY, resultBundle)
            },
            calendar.get(Calendar.YEAR),
            calendar.get(Calendar.MONTH),
            calendar.get(Calendar.DAY_OF_MONTH)
        )
    }
 
    companion object {
        const val REQUEST_KEY = "DATE_PICKER_RESULT"
        const val KEY_DATE = "selected_date"
    }
}

class CrimeDetailFragment : Fragment(R.layout.fragment_crime_detail) {
 
    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
 
        childFragmentManager.setFragmentResultListener(
            DatePickerFragment.REQUEST_KEY,
            viewLifecycleOwner
        ) { _, bundle ->
            val date = bundle.getSerializable(DatePickerFragment.KEY_DATE) as Date
            updateDate(date)
        }
    }
 
    private fun showDatePicker() {
        DatePickerFragment().show(
            childFragmentManager,
            "DatePicker"
        )
    }
}

class InputDialogFragment : DialogFragment() {
 
    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        val view = LayoutInflater.from(requireContext())
            .inflate(R.layout.dialog_input, null, false)
 
        val editText = view.findViewById<EditText>(R.id.input_text)
 
        return AlertDialog.Builder(requireContext())
            .setView(view)
            .setTitle("输入嫌疑人姓名")
            .setPositiveButton("确定") { _, _ ->
                val result = editText.text.toString()
                setFragmentResult(
                    REQUEST_KEY,
                    Bundle().apply { putString(KEY_INPUT, result) }
                )
            }
            .setNegativeButton("取消", null)
            .create()
    }
}