androidx.navigation.NavDestination Java Examples

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case android.R.id.home:
            final NavController navController = Navigation.findNavController(
                    this,
                    R.id.nav_host_fragment
            );
            final NavDestination currentDestination = navController.getCurrentDestination();
            if (currentDestination != null && MAIN_DESTINATIONS.contains(currentDestination.getId())) {
                binding.drawerLayout.openDrawer(GravityCompat.START);
                return true;
            } else {
                onBackPressed();
            }
    }
    return super.onOptionsItemSelected(item);

}
 

/**
 * Determines whether the given <code>destId</code> matches the NavDestination. This handles
 * both the default case (the destination's id matches the given id) and the nested case where
 * the given id is a parent/grandparent/etc of the destination.
 */
private static boolean matchDestination(@NonNull NavDestination destination,
        @IdRes int destId) {
    NavDestination currentDestination = destination;
    while (currentDestination.getId() != destId && currentDestination.getParent() != null) {
        currentDestination = currentDestination.getParent();
    }
    return currentDestination.getId() == destId;
}
 

/**
 * Finds the actual start destination of the graph, handling cases where the graph's starting
 * destination is itself a NavGraph.
 */
private static NavDestination findStartDestination(@NonNull NavGraph graph) {
    NavDestination startDestination = graph;
    while (startDestination instanceof NavGraph) {
        NavGraph parent = (NavGraph) startDestination;
        startDestination = parent.findNode(parent.getStartDestination());
    }
    return startDestination;
}
 

@Override
public void onNavigated(@NonNull NavController controller,
        @NonNull NavDestination destination) {
    ActionBar actionBar = mActivity.getSupportActionBar();
    CharSequence title = destination.getLabel();
    if (!TextUtils.isEmpty(title)) {
        actionBar.setTitle(title);
    }
    boolean isStartDestination = findStartDestination(controller.getGraph()) == destination;
    actionBar.setDisplayHomeAsUpEnabled(mDrawerLayout != null || !isStartDestination);
    setActionBarUpIndicator(mDrawerLayout != null && isStartDestination);
}
 

private int getCurrentDestinationId() {
    final NavController navController = Navigation.findNavController(
            this,
            R.id.nav_host_fragment
    );
    final NavDestination currentDestination = navController.getCurrentDestination();
    return currentDestination == null ? 0 : currentDestination.getId();
}
 

private void configureActionBarForDestination(NavDestination destination) {
    final ActionBar actionbar = getSupportActionBar();
    if (actionbar == null) {
        return;
    }
    final int destinationId = destination.getId();
    final boolean showMenu = MAIN_DESTINATIONS.contains(destinationId);
    actionbar.setDisplayHomeAsUpEnabled(true);
    actionbar.setHomeAsUpIndicator(showMenu ? R.drawable.ic_menu_black_24dp : R.drawable.ic_arrow_back_white_24dp);
    actionbar.setDisplayShowTitleEnabled(destinationId != R.id.thread);
}
 

@Override
public void onDestinationChanged(@NonNull NavController controller, @NonNull NavDestination destination, @Nullable Bundle arguments) {
    LOGGER.debug("onDestinationChanged({})", destination.getLabel());
    if (destination.getId() == R.id.thread) {
        endActionMode();
    }
    configureActionBarForDestination(destination);
}
 

private int getCurrentNavDestinationId() {
  NavDestination destination = getNavController().getCurrentDestination();
  if (destination == null) {
    return -1;
  }
  return destination.getId();
}
 

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.navigation_activity);

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

    NavHostFragment host = (NavHostFragment) getSupportFragmentManager()
            .findFragmentById(R.id.my_nav_host_fragment);

    if (host != null) {
        NavController navController = host.getNavController();
        mDrawerLayout = findViewById(R.id.drawer_layout);
        NavigationUI.setupActionBarWithNavController(this, navController, mDrawerLayout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        if (navigationView != null) {
            NavigationUI.setupWithNavController(navigationView, navController);
        }
        BottomNavigationView bottomNavView = findViewById(R.id.bottom_nav_view);
        if (bottomNavView != null) {
            NavigationUI.setupWithNavController(bottomNavView, navController);
        }
        navController.addOnNavigatedListener(new NavController.OnNavigatedListener() {
            @Override
            public void onNavigated(@NonNull NavController controller,
                    @NonNull NavDestination destination) {
                String dest;
                try {
                    dest = getResources().getResourceName(destination.getId());
                } catch (Resources.NotFoundException e) {
                    dest = Integer.toString(destination.getId());
                }
                Toast.makeText(NavigationActivity.this, "Navigated to "
                        + dest,
                        Toast.LENGTH_SHORT).show();
                Log.d("NavigationActivity", "Navigated to " + dest);
            }
        });
    }
}
 

/**
 * NavDestinations should be created via {@link Navigator#createDestination}.
 */
Destination(@NonNull Navigator<? extends NavDestination> navigator) {
    super(navigator);
}