android - 如何将数据从 DialogFragment 传递到 android / Kotlin 中的片段

问题描述

我是 Android 应用程序开发和 Kotlin 的新手。当用户设置时间时，我需要从 DialogFragment 传递时间来更新片段（这是一个选项卡）上的按钮文本。任何建议如何做到这一点。我已阅读有关 viewModel 或使用接口的信息，但我无法在我的代码中真正实现它们。

这是我的fragment_weight.xml：

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Weight">

    
    <Button
        android:id="@+id/btnTime"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Time"
        android:layout_gravity="top|left" />
    
</FrameLayout>

这是我的体重.kt

package com.example.mytablayout

import android.os.Bundle
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment    
import android.widget.Button
import com.example.mytablayout.fragments.TimePickerFragment
import java.util.*    

lateinit var btnTime:Button

class Weight : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_weight, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        val c = Calendar.getInstance()            
        val hour = c.get(Calendar.HOUR)
        val minute = c.get(Calendar.MINUTE)            

        btnTime = view.findViewById(R.id.btnTime)
        var btnTimeText = hour.toString() + ':' + minute.toString()
        btnTime.setText(btnTimeText)           

        btnTime.setOnClickListener {
            val newTimeFragment = TimePickerFragment()
            newTimeFragment.show(childFragmentManager, "timePicker")

        }
    }
}

这是我的TimePickerFragment.kt

package com.example.mytablayout.fragments

import android.app.TimePickerDialog
import android.app.Dialog
import android.os.Bundle
import android.text.format.DateFormat
import android.widget.TimePicker
import androidx.fragment.app.DialogFragment
import java.util.*

class TimePickerFragment: DialogFragment(), TimePickerDialog.OnTimeSetListener {

    override fun onCreateDialog(savedInstanceState: Bundle?): Dialog {
        
        val c = Calendar.getInstance()
        val hour = c.get(Calendar.HOUR)
        val minute = c.get(Calendar.MINUTE)
        val dView = TimePickerDialog(requireActivity(), this, hour, minute, DateFormat.is24HourFormat(activity))
        
        return dView
    }

    override fun onTimeSet(view: TimePicker, hour: Int, minute: Int) {
        // Do something with the date chosen by the user           

    }

}

标签： androidkotlinfragmentdialogfragment

android - 如何将数据从 DialogFragment 传递到 android / Kotlin 中的片段

问题描述

解决方案

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