Styjun

EDIT: I have found a solution. What I created a separate activity, including another toolbar inside that activity. Then, I created a second navigation graph which I added to the second activity. I set up the second toolbar with the NavController of using the same method I used for my MainActivity. It worked just as I wanted!

I am using the new navigation component with a single Activity approach in the app. I want to set ToolBar style per Fragment keeping the navigation controller functionality (like navigation up and titles).

Initially, I tried searching for how to inflate Fragments with an alternative theme. I rejected this idea because

• it did not really work




• I only need to theme the Toolbar. URL

I have found this project that does it with Kotlin. However, it uses BottomNavigation which is not present in my app. https://android.jlelse.eu/a-quick-glance-on-single-activity-approach-with-navigation-component-f3b96b3b0a58

From that project:

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/container"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".MainActivity">

 <fragment
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:id="@+id/fragHost"
 android:name="androidx.navigation.fragment.NavHostFragment"
 app:navGraph="@navigation/nav_graph"
 app:layout_constraintTop_toTopOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintBottom_toBottomOf="parent"
 app:defaultNavHost="true" />

 <android.support.design.widget.BottomNavigationView
 android:id="@+id/navigation"
 android:layout_width="0dp"
 android:layout_height="wrap_content"
 android:layout_marginStart="0dp"
 android:layout_marginEnd="0dp"
 android:orientation="horizontal"
 android:background="?android:attr/windowBackground"
 app:layout_constraintBottom_toBottomOf="parent"
 app:layout_constraintLeft_toLeftOf="parent"
 app:layout_constraintRight_toRightOf="parent"
 app:menu="@menu/navigation" />

</android.support.constraint.ConstraintLayout>

MainActivity.kt

override fun onCreate(savedInstanceState: Bundle?) 
 super.onCreate(savedInstanceState)
 setContentView(R.layout.activity_main)

 navigation.setupWithNavController(findNavController(R.id.fragHost))
 

override fun onSupportNavigateUp() = findNavController(R.id.fragHost).navigateUp()

FirstFragment.kt

override fun onViewCreated(view: View, savedInstanceState: Bundle?) 
 super.onViewCreated(view, savedInstanceState)
 collapsingToolbar.setupWithNavController(toolbar, findNavController())
 

SecondFragment.kt

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
 savedInstanceState: Bundle?): View? 
 changeStatusBarColor(R.color.colorBlue)
 return inflater.inflate(R.layout.fragment_second, container, false)
 

 override fun onViewCreated(view: View, savedInstanceState: Bundle?) 
 super.onViewCreated(view, savedInstanceState)
 toolbar.setupWithNavController(findNavController())
 

 override fun onDestroyView() 
 super.onDestroyView()

 changeStatusBarColor(R.color.colorPrimaryDark)
 

 private fun changeStatusBarColor(colorResId: Int) 
 activity?.window?.statusBarColor = ContextCompat.getColor(context!!, colorResId)
 

So far, I have been able to find how to set up Navigation controller with Toolbar once in MainActivity. This allows for correct navigation up action but does not allow custom themes. Reference: https://developer.android.com/guide/navigation/navigation-ui#top_app_bar

In my MainActivity.java, I did the following

@Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 final Toolbar toolbar = findViewById(R.id.toolbar);
 final int[] topDestination = R.id.loginFragment, R.id.mainFragment ;
 AppBarConfiguration.Builder abcBuiler = new AppBarConfiguration.Builder(topDestination);
 AppBarConfiguration abc = abcBuiler.build();
 NavController navController = Navigation.findNavController(this, R.id.fragHost);
 // Set up navigation controller toolbar
 NavigationUI.setupWithNavController(toolbar, navController, abc);

toolbar.setupWithNavController(findNavController()) function is not present in Java or at least I was not able to find it.

NavigationUI.setupWithNavController(toolbar, navController, AppBarConfiguration); sets up the Toolbar once in MainActivity and I cannot find a way how to theme it inside fragments.