如何显示tablayout的滚动条？

<com.google.android.material.tabs.TabLayout
    android:id="@+id/tab_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabMode="scrollable" />

<style name="CustomTabLayout" parent="Widget.Design.TabLayout">
    <item name="tabIndicatorColor">@color/your_indicator_color</item>
    <item name="tabIndicatorHeight">4dp</item>
    <item name="tabTextAppearance">@style/CustomTabTextAppearance</item>
    <item name="tabSelectedTextColor">@color/your_selected_text_color</item>
</style>

<style name="CustomTabTextAppearance" parent="TextAppearance.Design.Tab">
    <item name="android:textSize">14sp</item>
    <item name="android:textColor">@color/your_text_color</item>
</style>

<com.google.android.material.tabs.TabLayout
    android:id="@+id/tab_layout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="@style/CustomTabLayout"
    app:tabMode="scrollable" />

TabLayout tabLayout = findViewById(R.id.tab_layout);
for (int i = 0; i < tabCount; i++) {
    TabLayout.Tab tab = tabLayout.newTab();
    tab.setText("Tab " + (i + 1));
    tabLayout.addTab(tab);
}