add BottomNavigationBehavior

app/src/main/java/com/sliit/smartserviceassistant/BottomNavigationBehavior.java

+package com.sliit;
+
+
+
+import android.content.Context;
+import com.google.android.material.bottomnavigation.BottomNavigationView;
+import androidx.coordinatorlayout.widget.CoordinatorLayout;
+import androidx.core.view.ViewCompat;
+import android.util.AttributeSet;
+import android.view.View;
+import android.widget.FrameLayout;
+
+public class BottomNavigationBehavior extends CoordinatorLayout.Behavior<BottomNavigationView> {
+
+    public BottomNavigationBehavior() {
+        super();
+    }
+
+    public BottomNavigationBehavior(Context context, AttributeSet attrs) {
+        super(context, attrs);
+    }
+
+    @Override
+    public boolean layoutDependsOn(CoordinatorLayout parent, BottomNavigationView child, View dependency) {
+        boolean dependsOn = dependency instanceof FrameLayout;
+        return dependsOn;
+    }
+
+    @Override
+    public boolean onStartNestedScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View directTargetChild, View target, int nestedScrollAxes) {
+        return nestedScrollAxes == ViewCompat.SCROLL_AXIS_VERTICAL;
+    }
+
+    @Override
+    public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, BottomNavigationView child, View target, int dx, int dy, int[] consumed) {
+        if (dy < 0) {
+            showBottomNavigationView(child);
+        } else if (dy > 0) {
+            hideBottomNavigationView(child);
+        }
+    }
+
+    private void hideBottomNavigationView(BottomNavigationView view) {
+        view.animate().translationY(view.getHeight());
+    }
+
+    private void showBottomNavigationView(BottomNavigationView view) {
+        view.animate().translationY(0);
+    }
+}
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