从片段转移到科特林的另一个片段

时间:2020-02-02 16:42:07

标签: android android-fragments kotlin

我试图制作一个将转到另一个片段的按钮,但是,它显示了第一个片段上方的第二个片段,我确实需要这些片段的帮助,因为它是新的。

这是我的第一个片段代码:

 class ToolsFragment : Fragment() {


    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        val root = inflater.inflate(R.layout.fragment_tools, container, false)
        val calcButton = root.findViewById<Button>(R.id.calc_button)

        calcButton.setOnClickListener {
            Log.d("ToolsFragment", "Calc Button Clicked")
            val fragment = MarksCalc()
            val fragmentManager = activity!!.supportFragmentManager
            val fragmentTransaction = fragmentManager.beginTransaction()
            fragmentTransaction.replace(R.id.nav_host_fragment, fragment)
            fragmentTransaction.addToBackStack(null)
            fragmentTransaction.commit()
        }

        return root
    }
}

这是我的第二个片段

package com.example.itclubbeta

import android.content.Context
import android.net.Uri
import android.os.Bundle
import android.util.Log
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button

class MarksCalc : Fragment() {

    override fun onCreateView(inflater: LayoutInflater,
                              container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_marks_calc, container, false)
    }
}

这是nav_host_fragment

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:showIn="@layout/app_bar_main_page">

    <fragment
        android:id="@+id/nav_host_fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/mobile_navigation" />
</androidx.constraintlayout.widget.ConstraintLayout>

1 个答案:

答案 0 :(得分:1)

您实际上可以在导航图

中向片段添加操作

示例:

<fragment
    android:id="@+id/fragment_id_here"
    android:name="fragment_name_here">
    <action
        android:id="@+id/your_main_fragment_id_to_your_next_fragment_id
        app:destination="@id/id_of_the_next_fragment_to_display"/>
</fragment>

,现在您可以通过 findNavController

调用操作
calcButton.setOnClickListener {
        Log.d("ToolsFragment", "Calc Button Clicked")
        findNavController().navigate(
            R.id.your_main_fragment_id_to_your_next_fragment_id
        )
    }

https://developer.android.com/guide/navigation/navigation-design-graph

上了解有关导航的更多信息