Android jetpack Navigation的简单使用

Posted 2022-05-23 安果移不动

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