Navigation-Component-DrawerLayout-with-Custom-Transition-Animation-and-Custom-Navigation-Listener

This Tutorial will discuss how to implement custom transition animation when using Navigation Component provided by Android Jetpack and DrawerLayout.

Prerequisite:

This tutorial assumes that you are familiar with the following:

Android Jetpack Navigation Component
DrawerLayout

Discussion

If you are familiar with Android Jetpack Navigation Component, you will find that it's too easy to combine your navigation graph with a DrawerLayout. You will only use one line of code to make this done

    NavigationUI.setupWithNavController(navigationView, navController);

As you can see here, there is no much control for you over the way of communication between the NavController and DrawerLayout. The NavigationUI class will handle everything for you starting with making the navigation when you press on a menu item, applying default animation for transition, updating the selected menu item in the DrawerLayout.

NOTE: For Navigation Component to work with the menu that your are creating in the DrawerLayout, The Menu Item Id should match with the desired Destination Fragment Id

Some Other Code should be implemented for two reasons:

Consider the navigation destinations which could be made through the DrawerLayout as Top-Level destinations
Setup the DrawerLayout with the ActionBar and Show the Hamberg Icon.

First, to define the Top-Level destinations, You should create an AppBarConfiguration object and pass the Top-Level destinations ids to the builder. Second, You also have to use setDrawerLayout() to connect the DrawerLayout to the ActionBar and Show the Hamberg Icon. Last, You have to connect the NavController to your ActionBar and pass the AppBarConfiguration object which allow the activation of the previous two steps and also to update the ActionBar Title with the label of the destination fragment

    AppBarConfiguration appBarConfiguration = new AppBarConfiguration.Builder(R.id.homeFragment, R.id.requestsFragment, R.id.chatFragment, R.id.profileFragment, R.id.notificationsFragment)
            .setDrawerLayout(binding.drawerLayout)
            .build();

    NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);

You will find that the Hamberg Icon has no action when clicked that is because the Activity is trying to perform the default NavigationUp which is calling the Parent Activity if you specify it in the Manifest file. If you are not specifying any parent activity, The default action will be “nothing”.

So, We have to override this default behavior to make the Hamberg Icon communicate with the DrawerLayout and NavController.

@Override
public boolean onSupportNavigateUp() {
    return NavigationUI.navigateUp(navController, appBarConfiguration) || super.onSupportNavigateUp();
}

Let’s Get back to the purpose of this tutorial

What if you want to do any of the following case scenarios:

Allow menu items to have other functionalities rather than only moving through the available navigation destinations
Applying Custom Transition Animation

Case Scenario One

For the first case scenario, you may have 5 menu items in the DrawerLayout. Four of them is used to navigate between available destinations and the last one is used to start a new activity (maybe a SettingsActivity). What will come up on your mind is to use the setNavigationItemSelectedListener() method. Yes this is the first step of the solution, But actually you are breaking the communications between the NavController and DrawerLayout which has been handled automatically as you called

    NavigationUI.setupWithNavController(navigationView, navController);

So you have to drop using this simple linking method and use another method which is

    NavigationUI.onNavDestinationSelected(item, navController);

Here is the Steps to achieve the desired behavior in the first case scenario;

Use setNavigationItemSelectedListener() method to control what happen when you select a menu item
Check if the NavGraph contains a similar destination as the menu item id
For menu items that used to navigate between the NavGraph destination, Use NavigationUI.onNavDestinationSelected(item, navController) to handle the navigation for you.
If there is no such destination, Use Switch/Case block to differentiate between the menu items
it doesn’t matter for this case if you return true or false Note: if you want to use the settings item to open a SettingsActivity, it is better not to check the Settings Item. So when you press the back button and return back to the MainActivity you will find the right menu item checked according to the last position before leaving the activity.
Override the onBackPressed() method to check the menu item related to the start destination fragment.

Here is a complete code snippet

@Override
protected void onCreate(Bundle savedInstanceState) {
....

NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);

navigationView.setCheckedItem(R.id.homeFragment);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        boolean handled = false;
        if (navController.getGraph().findNode(item.getItemId()) != null) {
            NavigationUI.onNavDestinationSelected(item, navController);
            handled = true;
        } else {
            switch (item.getItemId()){
                case R.id.settings:
                    openSettingsActivity();
                    break;
            }
        }

        if (handled) {
            Menu menu = navigationView.getMenu();
            for (int h = 0, size = menu.size(); h < size; h++) {
                MenuItem menu_item = menu.getItem(h);
                menu_item.setChecked(menu_item.getItemId() == item.getItemId()); 
            }
        }

        drawerLayout.closeDrawer(GravityCompat.START); 
        return handled;
    }
});
}

@Override
public void onBackPressed() {
    if (binding.drawerLayout.isDrawerOpen(GravityCompat.START)) {
        binding.drawerLayout.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
        Menu menu = navigationView.getMenu();
        for (int h = 0, size = menu.size(); h < size; h++) {
            MenuItem item = menu.getItem(h);
            item.setChecked(h == 0);
        }
    }
}

Case Scenario Two

For this case scenario, you have the exact first scenario but you also want to apply a custom transition animation. Fortunately, Android Jetpack Navigation Component allows you to create custom transition animation but unfortunately you don't have a direct api to add these custom transition animation to the NavigationUI.setupWithNavController() api. Also, NavigationUI.onNavDestinationSelected() method doesn't support custom transition animation So, you have to use another api which allow you to add these custom transition animations.

Here is the Steps to achieve the desired behavior in the first case scenario;

Create a NavOption object and pass the custom transition animation to it using the following methods

         .setEnterAnim(R.anim.slide_in_right)
         .setExitAnim(R.anim.slide_out_left)
         .setPopEnterAnim(R.anim.slide_in_right)
         .setPopExitAnim(R.anim.slide_out_left)

You have to make sure of creating only one instance of the same destination target (the destination fragment you are navigating to) by adding this parameter to the NavOption Object
```
         .setLaunchSingleTop(true)
```
You will also need to make sure that the navigation BackStack is cleared with every transition so that when you press the back button, you go for the start destination fragment, not the previous selected fragment. This can be achieved by adding the following parameters to the NavOption Object
```
         .setPopUpTo(navController.getGraph().getStartDestination(), false)
```
Pass the NavOption Object to the NavController.navigate() method to be applied for the navigation operation navController.navigate(item.getItemId(), null, navOptions);
As Previous Case Scenario, you have to Use setNavigationItemSelectedListener().
Check if the NavGraph contains a similar destination as the menu item id
For menu items that used to navigate between the NavGraph destination, Use navController.navigate(item.getItemId(), null, navOptions) to handle the navigation for you.
If there is no such destination, Use Switch/Case block to differentiate between the menu items
it doesn’t matter for this case if you return true or false
Override the onBackPressed() method to check the menu item related to the start destination fragment.

Here is a complete code snippet

@Override
protected void onCreate(Bundle savedInstanceState) {
....

    NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);

    NavOptions navOptions = new NavOptions.Builder()
            .setLaunchSingleTop(true)
            .setEnterAnim(R.anim.slide_in_right)
            .setExitAnim(R.anim.slide_out_left)
            .setPopEnterAnim(R.anim.slide_in_right)
            .setPopExitAnim(R.anim.slide_out_left)
            .setPopUpTo(navController.getGraph().getStartDestination(), false)
            .build();

navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        boolean handled = false;
        if (navController.getGraph().findNode(item.getItemId()) != null) {
            navController.navigate(item.getItemId(), null, navOptions);
            handled = true;
        } else {
            switch (item.getItemId()) {
                case R.id.settings:
                    openSettingsActivity();
                    break;
            }
        }

        if (handled) {
            Menu menu = binding.navigationView.getMenu();
            for (int h = 0, size = menu.size(); h < size; h++) {
                MenuItem menu_item = menu.getItem(h);
                menu_item.setChecked(menu_item.getItemId() == item.getItemId()); // TODO - This Updates The SideMenu Selection
            }
        }

        binding.drawerLayout.closeDrawer(GravityCompat.START); // TODO - This Closes The SideMenu Drawer
        return false;
    }
});
}

@Override
public void onBackPressed() {
    if (binding.drawerLayout.isDrawerOpen(GravityCompat.START)) {
        binding.drawerLayout.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
        Menu menu = navigationView.getMenu();
        for (int h = 0, size = menu.size(); h < size; h++) {
            MenuItem item = menu.getItem(h);
            item.setChecked(h == 0);
        }
    }
}

Worthy to be mentioned

I have created a bug in the Google Issue Tracker to Support Applying Custom Transition Animations by sending a NavOptions along with the NavigationUI.setupWithNavController() method.

Here is Google Team Reply:

Status: Won't Fix (Intended Behavior)

NavigationUI follows the material design guidelines, which specifically call for a cross fade animation between BottomNavigationView items (and, as we've confirmed with the material team, also is the case for DrawerLayout, etc): https://material.io/design/components/bottom-navigation.html#behavior

Setting your own listener is indeed the correct approach if you want to deviate from the guidelines and what NavigationUI provides.

https://issuetracker.google.com/issues/138665563

What's Next ?

Navigation-Component-BottomNavigationView-with-Custom-Transition-Animation-and-Navigation-Listener

https://github.com/KarimRedaHassan/Navigation-Component-BottomNavigationView-with-Custom-Transition-Animation-and-Navigation-Listener

Navigation-Component-OptionsMenu-with-Custom-Transition-Animation-and-Custom-Navigation-Listener

https://github.com/KarimRedaHassan/Navigation-Component-OptionsMenu-with-Custom-Transition-Animation-and-Custom-Navigation-Listener

Navigation-Component-TabLayout-with-Custom-Transition-Animation-and-Custom-Navigation-Listener https://github.com/KarimRedaHassan/Navigation-Component-TabLayout-with-Custom-Transition-Animation-and-Navigation-Listener

Additional Resources

https://developer.android.com/guide/navigation/navigation-getting-started

https://developer.android.com/guide/navigation/navigation-ui

https://codelabs.developers.google.com/codelabs/android-navigation/index.html#0

Also See

A Full List Of All My Tutorials

https://github.com/KarimRedaHassan?tab=repositories

KarimRedaHassan/Navigation-Component-DrawerLayout-with-Custom-Transition-Animation-and-Custom-Navigation-Listener