會自動添加fragment依賴
implementation 'androidx.navigation:navigation-fragment-ktx:2.3.0'
implementation 'androidx.navigation:navigation-ui-ktx:2.3.0'
容器nav_container，用來放fragment
<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="@+id/nav_container"
app:startDestination="@id/nav1Fragment">
<fragment
android:id="@+id/nav1Fragment"
android:name="com.bliss.myapp.Nav1Fragment"
android:label="fragment_nav1"
tools:layout="@layout/fragment_nav1" >
<action
android:id="@+id/action_nav1Fragment_to_nav2Fragment2"
app:destination="@id/nav2Fragment"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"/>
</fragment>
<fragment
android:id="@+id/nav2Fragment"
android:name="com.bliss.myapp.Nav2Fragment"
android:label="fragment_nav2"
tools:layout="@layout/fragment_nav2" />
</navigation>
activity中引用fragment容器
引用容器nav_container
<fragment
android:id="@+id/nav_host_fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="@navigation/nav_container"
android:name="androidx.navigation.fragment.NavHostFragment"/>
app:defaultNavHost=“true” 該Fragment會自動處理系統返回鍵，即，當用戶按下手機的返回按鈕時，系統能自動將當前的Fragment推出。
app:navGraph 設置該Fragment對應的導航圖 。
容器中在design視圖下創建fragment
fragment間跳轉
view.findViewById<Button>(R.id.btnToSecondFragment).setOnClickListener(Navigation.createNavigateOnClickListener(R.id.action_nav1Fragment_to_nav2Fragment2))
fragment跳轉動畫
<fragment
android:id="@+id/nav1Fragment"
android:name="com.bliss.myapp.Nav1Fragment"
android:label="fragment_nav1"
tools:layout="@layout/fragment_nav1" >
<action
android:id="@+id/action_nav1Fragment_to_nav2Fragment2"
app:destination="@id/nav2Fragment"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"/>
</fragment>
轉場動畫
app:popEnterAnim 點擊返回鍵action所在元素入場的動畫，是Fargment1入場的動畫
app:popExitAnim 點擊返回 ，Fragment2離場的動畫
app:enterAnim action目的地進入的動畫,是Fragment2入場的動畫
app:exitAnim 這個action所在元素離開的動畫，是Fargment1離場的動畫
Bundle傳參
class Nav1Fragment : Fragment(),View.OnClickListener {
var parms = Bundle()
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
var view = inflater.inflate(R.layout.fragment_nav1, container, false)
parms.putString("name","秦時明月")
// view.findViewById<Button>(R.id.btnToSecondFragment).setOnClickListener(Navigation.createNavigateOnClickListener(R.id.action_nav1Fragment_to_nav2Fragment2,parms))
view.findViewById<Button>(R.id.btnToSecondFragment).setOnClickListener(this)
return view
}
override fun onClick(view: View?) {
when(view?.id){
R.id.btnToSecondFragment -> Navigation.findNavController(view).navigate(R.id.action_nav1Fragment_to_nav2Fragment2,parms)
}
}
}
class Nav2Fragment : Fragment() {
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
// Inflate the layout for this fragment
var param1 = arguments
var view = inflater.inflate(R.layout.fragment_nav2, container, false)
Log.e("TAG", "onCreateView: param == $param1" )
if (param1!=null){
var name = param1?.get("name")
Log.e("TAG", "onCreateView: name == $name" )
}
return view
}
}
safe args傳參
APP根目錄下的build.gradle添加依賴
def nav_version = "2.3.0-alpha01"
classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
在app的build.gradle文件中添加
apply plugin: 'androidx.navigation.safeargs'
在導航圖中添加標簽。我們可以直接在Text中編寫XML代碼，也可以通過Design面板添加
<fragment
android:id="@+id/nav1Fragment"
android:name="com.bliss.myapp.Nav1Fragment"
android:label="fragment_nav1"
tools:layout="@layout/fragment_nav1" >
<action
android:id="@+id/action_nav1Fragment_to_nav2Fragment2"
app:destination="@id/nav2Fragment"
app:popEnterAnim="@anim/slide_in_left"
app:popExitAnim="@anim/slide_out_right"
app:enterAnim="@anim/slide_in_right"
app:exitAnim="@anim/slide_out_left"/>
<argument
android:name="age"
app:argType="integer"
android:defaultValue="0">
</argument>
</fragment>
rebuild 項目，會生成對應的參數相關的代碼
利用生成的代碼傳遞參數
var safeArgs = Nav1FragmentArgs.Builder().setAge(100).build().toBundle() //safeargs傳參
when(view?.id){
R.id.btnToSecondFragment -> Navigation.findNavController(view).navigate(R.id.action_nav1Fragment_to_nav2Fragment2,safeArgs)
// R.id.btnToSecondFragment -> Navigation.findNavController(view).navigate(R.id.action_nav1Fragment_to_nav2Fragment2,parms)
}
其他fragment接受參數
if (arguments != null){
var safeArgs = Nav1FragmentArgs.fromBundle(requireArguments()).age
Log.e("TAG", "onCreateView: safeArgs = =$safeArgs" )
}
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原文鏈接：https://blog.csdn.net/ytfunnysite/article/details/108667383