How to hide navigation drawer when opening certain fragment?

Question

I\'m pretty new in android development. I want to hide navigation drawer when user is not logged in. So basically, it will shown login fragment (better in full screen like F

Answer 1

Define an interface say DrawerLocker:

interface DrawerLocker{
   public void setDrawerLocked(boolean shouldLock);
}

Implement this interface in your activity which contains the NavigationDrawer and override this method.

class YourActivity implements DrawerLocker{
...
...
public void setDrawerLocked(boolean enabled){
    if(enabled){
        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
    }else{
        drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
    }

}

Now in your Fragment's onCreateView, call this method like:

 ((DrawerLocker)getActivity()).setDrawerLocked(true);

In your Fragment's onDestroyView, re enable the drawer layout:

((DrawerLocker)getActivity()).setDrawerLocked(false);

Answer 2

This code in activity onCreate method will block drawer when you will have more than one fragment in stack:

 getSupportFragmentManager().addOnBackStackChangedListener(() -> {
        if (getSupportFragmentManager().getBackStackEntryCount() > 0) {
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
        } else {
            drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
        }
    });