4. Navigation - Create a fragment

TitleFragment.kt

package com.example.android.navigation

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.databinding.DataBindingUtil
import com.example.android.navigation.databinding.FragmentTitleBinding

// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private const val ARG_PARAM1 = "param1"
private const val ARG_PARAM2 = "param2"

/**
 * A simple [Fragment] subclass.
 * Use the [TitleFragment.newInstance] factory method to
 * create an instance of this fragment.
 */
class TitleFragment : Fragment() {

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                              savedInstanceState: Bundle?): View? {
        val binding = DataBindingUtil.inflate<FragmentTitleBinding>(inflater,
        R.layout.fragment_title, container, false)
        return binding.root
    }
}

 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?><!--
  ~ Copyright 2018, The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~     http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
  -->

<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <!-- TODO (04) Add a fragment tag for the titleFragment in the LinearLayout
                 Use @+id/titleFragment for the android:id
                 Use com.example.android.navigation.TitleFragment for the android:name
                 Use match_parent for the layout_height and layout_width -->
            <fragment
                android:id="@+id/titleFragment"
                android:name="com.example.android.navigation.TitleFragment"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                />
        </LinearLayout>

</layout>