创建资源文件

会在res/

新增如下文件

然后还会提示你是否加上对应依赖

    implementation 'androidx.navigation:navigation-fragment-ktx:2.4.2'
    implementation 'androidx.navigation:navigation-ui-ktx:2.4.2'

我们选上是就加上了

新建两个Fragement

其布局代码相同都为

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".fragment.DetailNavigationFragment">

    <Button
        android:id="@+id/button9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />

</androidx.constraintlayout.widget.ConstraintLayout>

针对刚才添加的

my_nav_graph.xml

进行手动添加视图

点击+号后选择我们刚才的fragment

选中第一个然后鼠标移动到第二个选中第二个然后移动到第一个就会新增两个Action

然后我们去到接收fragment的页面的布局当中

在拖拽过程中你可以发现他会让你选一个graph文件

选择我们刚才创建好的文件

添加后修改修改布局

<?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"
    tools:context=".activity.NavigationActivity">

    <androidx.fragment.app.FragmentContainerView
        android:id="@+id/fragmentContainerView"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:navGraph="@navigation/my_nav_graph" />
</androidx.constraintlayout.widget.ConstraintLayout>

对应的页面代码

package com.anguomob.jecpack.activity

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.navigation.fragment.NavHostFragment
import androidx.navigation.ui.NavigationUI
import com.anguomob.jecpack.R
import com.anguomob.jecpack.databinding.ActivityNavigationBinding


class NavigationActivity : AppCompatActivity() {
    private lateinit var binding: ActivityNavigationBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityNavigationBinding.inflate(layoutInflater)
        setContentView(binding.root)
        //fragment的切换 通过NavController进行管理


        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.fragmentContainerView) as NavHostFragment
        val navController = navHostFragment.navController
        NavigationUI.setupActionBarWithNavController(this, navController = navController)
    }

    //支持返回键
    override fun onSupportNavigateUp(): Boolean {
        val navHostFragment = supportFragmentManager
            .findFragmentById(R.id.fragmentContainerView) as NavHostFragment
        val navController = navHostFragment.navController
        return navController.navigateUp()
    }
}

对应

HomeNavigationFragment 代码

package com.anguomob.jecpack.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import android.widget.Button
import androidx.navigation.Navigation
import com.anguomob.jecpack.R
import com.anguomob.jecpack.databinding.ActivityNavigationBinding
import com.anguomob.jecpack.databinding.FragmentHomeNavigationBinding


class HomeNavigationFragment : Fragment() {

    private lateinit var binding: FragmentHomeNavigationBinding
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = FragmentHomeNavigationBinding.inflate(inflater)
//        inflater.inflate(R.layout.fragment_home_navigation, container, false)
        return binding.root
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        binding.btHome.setOnClickListener {
            val findNavController = Navigation.findNavController(it)
            findNavController.navigate(R.id.action_homeNavigationFragment_to_detailNavigationFragment)
        }
    }
}

布局

<?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"
    tools:context=".fragment.HomeNavigationFragment">


    <Button
        android:id="@+id/btHome"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是主页，我要去详情页"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />
</androidx.constraintlayout.widget.ConstraintLayout>

detail fragment代码

package com.anguomob.jecpack.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.navigation.Navigation
import com.anguomob.jecpack.R
import com.anguomob.jecpack.databinding.FragmentDetailNavigationBinding
import com.anguomob.jecpack.databinding.FragmentHomeNavigationBinding

// 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 [DetailNavigationFragment.newInstance] factory method to
 * create an instance of this fragment.
 */
class DetailNavigationFragment : Fragment() {
    private lateinit var binding: FragmentDetailNavigationBinding
    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        binding = FragmentDetailNavigationBinding.inflate(inflater)
//        inflater.inflate(R.layout.fragment_home_navigation, container, false)
        return binding.root
    }

    override fun onActivityCreated(savedInstanceState: Bundle?) {
        super.onActivityCreated(savedInstanceState)
        binding.btDetail.setOnClickListener {
            val findNavController = Navigation.findNavController(it)
            findNavController.navigate(R.id.action_detailNavigationFragment_to_homeNavigationFragment)
        }
    }
}

布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    tools:context=".fragment.DetailNavigationFragment">

    <Button
        android:id="@+id/btDetail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="我是详情页，我要去主页"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />

</androidx.constraintlayout.widget.ConstraintLayout>

然后就是可以运行看下效果

Android jetpack Navigation的简单使用

创建资源文件

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