AndroidStudio实现底部导航栏报错，怎么解决

Question

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

Answer 1

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

你这里是不是缺少一个layout？setDrawerLayout