AndroidStudio实现底部导航栏报错，怎么解决

问题遇到的现象和发生背景

在虚拟机上运行时出现闪退

问题相关代码，请勿粘贴截图

public class FunctionPage1 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_function_page1);
        // 获取底部导航栏组件的容器
        BottomNavigationView bottomNavigationView = findViewById(R.id.bottomNavigation);
        // 获取之前存在与导航栏组件之前的控件
        NavController navController ;
        NavHostFragment navHostFragment = (NavHostFragment) getSupportFragmentManager().findFragmentById(R.id.fragment);
        navController = navHostFragment.getNavController();
        // 导航栏的配置
        AppBarConfiguration configuration = new AppBarConfiguration.Builder(bottomNavigationView.getMenu()).build();
        // 装配这些控件（报错出现在下面两行代码）
        NavigationUI.setupActionBarWithNavController(this,navController,configuration);
        NavigationUI.setupWithNavController(bottomNavigationView,navController);
    }
}

运行结果及报错内容

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.studyapplication/com.example.studyapplication.FunctionPage1}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference

我想要达到的结果

完美解决这个问题

AppBarConfiguration configuration = new AppBarConfiguration.Builder(bottomNavigationView.getMenu()).build();

你这里是不是缺少一个layout？setDrawerLayout

ActionBarOnDestinationChangedListener.java:48
这一行ActionBar.setTitle出现空指针，你的ActionBar传进来是空的或者没有正确地初始化

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.studyapplication, PID: 5134
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.studyapplication/com.example.studyapplication.FunctionPage1}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2698)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2759)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1482)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6190)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:892)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:782)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.appcompat.app.ActionBar.setTitle(java.lang.CharSequence)' on a null object reference
at androidx.navigation.ui.ActionBarOnDestinationChangedListener.setTitle(ActionBarOnDestinationChangedListener.java:48)
at androidx.navigation.ui.AbstractAppBarOnDestinationChangedListener.onDestinationChanged(AbstractAppBarOnDestinationChangedListener.java:103)
at androidx.navigation.NavController.addOnDestinationChangedListener(NavController.java:233)
at androidx.navigation.ui.NavigationUI.setupActionBarWithNavController(NavigationUI.java:237)
at com.example.studyapplication.FunctionPage1.onCreate(FunctionPage1.java:29)
at android.app.Activity.performCreate(Activity.java:6698)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2759) 
at android.app.ActivityThread.-wrap12(ActivityThread.java) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1482) 
at android.os.Handler.dispatchMessage(Handler.java:102) 
at android.os.Looper.loop(Looper.java:154) 
at android.app.ActivityThread.main(ActivityThread.java:6190) 
at java.lang.reflect.Method.invoke(Native Method) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:892) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:782)