在Activity的onCreate生命周期里执行下列代码,导致 xxx does not have a NavController set on xxx 报错

I/art: Do partial code cache collection, code=57KB, data=58KB
I/art: After code cache collection, code=53KB, data=56KB
I/art: Increasing code cache capacity to 256KB
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: mainProcess: com.zjm.myapplication, PID: 6291java.lang.RuntimeException: Unable to start activity ComponentInfo{com.zjm.myapplication/com.zjm.myapplication.footNavigation.FootNavActivity}: java.lang.IllegalStateException: Activity com.zjm.myapplication.footNavigation.FootNavActivity@23141b0 does not have a NavController set on 2131230967at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2668)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2729)at android.app.ActivityThread.-wrap12(ActivityThread.java)at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1480)at android.os.Handler.dispatchMessage(Handler.java:102)at android.os.Looper.loop(Looper.java:154)at android.app.ActivityThread.main(ActivityThread.java:6176)at java.lang.reflect.Method.invoke(Native Method)at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:893)at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)Caused by: java.lang.IllegalStateException: Activity com.zjm.myapplication.footNavigation.FootNavActivity@23141b0 does not have a NavController set on 2131230967at androidx.navigation.Navigation.findNavController(Navigation.java:61)at com.zjm.myapplication.footNavigation.FootNavActivity.onCreate(FootNavActivity.java:28)at android.app.Activity.performCreate(Activity.java:6692)at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2621)at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2729) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1480) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6176) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:893) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:783)

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:id="@+id/activity_foot_main"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".footNavigation.FootNavActivity"><com.google.android.material.bottomnavigation.BottomNavigationViewandroid:id="@+id/bottomNavigationView"android:layout_width="match_parent"android:layout_height="wrap_content"app:layout_constraintBottom_toBottomOf="parent"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:menu="@menu/menu_foot_nav" /><androidx.fragment.app.FragmentContainerViewandroid:id="@+id/fragmentContainerView2"android:name="androidx.navigation.fragment.NavHostFragment"android:layout_width="match_parent"android:layout_height="0dp"app:defaultNavHost="true"app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"app:layout_constraintEnd_toEndOf="parent"app:layout_constraintStart_toStartOf="parent"app:layout_constraintTop_toTopOf="parent"app:navGraph="@navigation/nav_graph_foot" /></androidx.constraintlayout.widget.ConstraintLayout>

代码：

    @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding = ActivityFootNavBinding.inflate(getLayoutInflater());setContentView(binding.getRoot());BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);NavController navController = Navigation.findNavController(this,R.id.fragmentContainerView2);AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);NavigationUI.setupWithNavController(bottomNavigationView,navController);}

问题原因

问题原因就是在onCreate生命周期里FragmentContainerView对应的NavController未构建成功.

方式一:

很简单直接onStart生命周期里获取NavController,如下代码:

    @Overrideprotected void onStart() {super.onStart();navController = Navigation.findNavController(this,R.id.fragmentContainerView2);}

或者,将获取NavController的任务放到view创建测绘完成后在执行

        mBinding.fragment.post(new Runnable() {@Overridepublic void run() {navController = Navigation.findNavController(this,R.id.fragmentContainerView2);}});

方式二:

使用getSupportFragmentManager获取

    @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding = ActivityFootNavBinding.inflate(getLayoutInflater());setContentView(binding.getRoot());BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigationView);NavHostFragment navHostFragment = (NavHostFragment)getSupportFragmentManager().findFragmentById(R.id.fragmentContainerView2);NavController navController = navHostFragment.getNavController();AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();NavigationUI.setupActionBarWithNavController(this,navController,appBarConfiguration);NavigationUI.setupWithNavController(bottomNavigationView,navController);}

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Android开发报错: xxx does not have a NavController set on xxx

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