android bottom navigation hide

private fun setupNav() { val navController = findNavController(R.id.nav_host_fragment) findViewById<BottomNavigationView>(R.id.bottomNav) .setupWithNavController(navController) navController.addOnDestinationChangedListener { _, destination, _ -> when (destination.id) { R.id.mainFragment -> showBottomNav() R.id.mineFragment -> showBottomNav() else -> hideBottomNav() } } } private fun showBottomNav() { bottomNav.visibility = View.VISIBLE } private fun hideBottomNav() { bottomNav.visibility = View.GONE }

android hide and show bottom navigation

public class BottomNavigationViewBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> {

private int height;

@Override
public boolean onLayoutChild(CoordinatorLayout parent, BottomNavigationView child, int layoutDirection) {
    height = child.getHeight();
    return super.onLayoutChild(parent, child, layoutDirection);
}

@Override
public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout,
                               BottomNavigationView child, @NonNull 
                               View directTargetChild, @NonNull View target,
                               int axes, int type)
{
    return axes == ViewCompat.SCROLL_AXIS_VERTICAL;
}

@Override
public void onNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull BottomNavigationView child,
           @NonNull View target, int dxConsumed, int dyConsumed,
           int dxUnconsumed, int dyUnconsumed, 
            @ViewCompat.NestedScrollType int type)
{
   if (dyConsumed > 0) {
       slideDown(child);
   } else if (dyConsumed < 0) {
       slideUp(child);
   }
}

private void slideUp(BottomNavigationView child) {
    child.clearAnimation();
    child.animate().translationY(0).setDuration(200);
}

private void slideDown(BottomNavigationView child) {
    child.clearAnimation();
    child.animate().translationY(height).setDuration(200);
}

Posted by: Guest on May-10-2020

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