onNavigationItemSelected() 问题

Question

when click on any menu item, there is no response, they suppose to navigate to Destination Fragment

    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        item.setChecked(true);

        int id = item.getItemId();
        switch (id) {

            case R.id.mealFragment:
                navController.navigate(R.id.mealFragment);
                break;

            case R.id.drinksFragment:
                navController.navigate(R.id.drinksFragment);
                break;

            case R.id.dessertFragment:
                navController.navigate(R.id.dessertFragment);
                break;

        }
        drawer.closeDrawer(GravityCompat.START);
        return true;

    }






// setting up on time Navigation 

private void setUpNavigation() {
    drawer = findViewById(R.id.drawer_layout);
    NavigationView navigationView = findViewById(R.id.nav_view);
    navController = Navigation.findNavController(this, R.id.nav_host_fragment);
    NavigationUI.setupActionBarWithNavController(this, navController, drawer);
    NavigationUI.setupWithNavController(navigationView, navController);
    navigationView.setNavigationItemSelectedListener(this);

}

after call setUpNavigation() . App keeps sticking on mealFragment() as its start Destination on navigation graph

Answer 1

I was programmatically adding HeaderView to NavigationView Hence I already had NavigationView

I called navigationView.bringToFront();

Here is code snippet for context :

NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view);
navigationView.bringToFront();

Answer 2

Did you set listner for navigationView as:

 NavigationView navigationView = (NavigationView) findViewById(R.id.navigation_view);
 navigationView.setNavigationItemSelectedListener(this);

befor implementing the onNavigationItemSelected(MenuItem item) as:

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
    // Handle navigation view item clicks here.
    int id = item.getItemId();

    if (id == R.id.nav_camara) {
        // Handle the camera action
    } else if (id == R.id.nav_gallery) {

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {



    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

Answer 3

Check with a Log.d() call if the onNavigationItemSelected event is fired or not. If not, check your the layout file for the clickable attribute:

<DrawerLayout
    android:clickable="true"
    android:focusable="true"