当点此搜索时，底部的bottomNavigationBar会出现，我想把它隐藏掉。

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        bottomNavigationBar = (BottomNavigationBar) findViewById(R.id.bottom_navigation_bar);
        //设置隐藏
        bottomNavigationBar.isAutoHideEnabled();
        bottomNavigationBar.setAutoHideEnabled(true);
        bottomNavigationBar.setMode(BottomNavigationBar.MODE_SHIFTING);
        
        .....
        }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:clipChildren="false"
    tools:context="com.example.hp.smartclass.MainActivity">

    <FrameLayout
        android:id="@+id/layFrame"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"  />

    <com.ashokvarma.bottomnavigation.BottomNavigationBar
        android:id="@+id/bottom_navigation_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:layout_weight="0"  />


</LinearLayout>