如何使用Android中的导航控制器自定义返回按钮以返回到某个目的地？

<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
    app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />

Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
NavigationUI.setupWithNavController(toolbar, navController, appBarConfiguration);

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0">
    <path
        android:fillColor="#FFFFFF"
        android:pathData="M20,11H7.83l5.59,-5.59L12,4l-8,8l8,8l1.41,-1.41L7.83,13H20v-2z" />
</vector>

@Override
public boolean onSupportNavigateUp() {
    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    return navController.navigateUp() || super.onSupportNavigateUp();
}

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeAsUpIndicator(R.drawable.back_icon);