How to hide bottom navigation from fragment on webview scroll

Question

Hello i have a problem with hide BottomNavigationView from fragment on WebView scroll below my code

Main Activity

@SuppressLint("Assert")
public void hideBottomNavigationView(boolean b) {
    if (b)
    {
        BottomNavigationView Bview = null;
        assert false;
        Bview.clearAnimation();
        Bview.animate().translationY(Bview.getHeight()).setDuration(300);
    }
    else
    {
        BottomNavigationView Bview = null;
        assert false;
        Bview.clearAnimation();
        Bview.animate().translationY(0).setDuration(300);
    }
}

Fragment

webView.setOnScrollChangeListener(new View.OnScrollChangeListener() {
        @Override
        public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
            if (scrollY>200)
            {
                ((MainActivity)getActivity()).hideBottomNavigationView(true);
            }
            else
            {
                ((MainActivity)getActivity()).hideBottomNavigationView(false);
            }
        }
    });

I don't know where i am doing wrong please help me to hiding BottomNavigation from fragment.

Print log in fragments in both `if` and `else` section see what you get. — Ashish Kudale, Mar 01 '19 at 11:23
sir i am not testing my app on emulator because my laptop not supporting emulator — Equalto multiply, Mar 01 '19 at 11:25
just wanted to know that is `onScrollChange` is getting called or not — Ashish Kudale, Mar 01 '19 at 11:26
yes sir onScrollChange work when webview scrollY > 200 then app automatically close — Equalto multiply, Mar 01 '19 at 11:28
i don't know sir where can i get that error because my emulator not working — Equalto multiply, Mar 01 '19 at 11:32
possible duplicate, check [this](https://stackoverflow.com/questions/14752523/how-to-make-a-scroll-listener-for-webview-in-android) out — Christos Themelis, Mar 01 '19 at 11:34
You can see errors and exceptions in Logcat window of Android Studio. Without exception we cannot help you. sorry. — Ashish Kudale, Mar 01 '19 at 11:48
@AshishKudale sir can you tell me how can i hide bottom navigation bar from fragment? — Equalto multiply, Mar 01 '19 at 12:14
refere this link :https://stackoverflow.com/questions/44777869/hide-show-bottomnavigationview-on-scroll — Nikhil Vadoliya, Mar 01 '19 at 12:29

How to hide bottom navigation from fragment on webview scroll

0 Answers0