Android WebView的滚动条不显示

Question

已经加入了这样的代码：

            myWebView.setVerticalScrollBarEnabled(true);
            myWebView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);

却仍然不显示进度条。
布局文件：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/AppTheme.AppBarOverlay">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar_custom"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/AppTheme.PopupOverlay" />
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <WebView
            android:id="@+id/webView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:scrollbarStyle="outsideOverlay" />
    </android.support.v4.widget.NestedScrollView>
        <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab_favorite"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_favorite_white_24dp"
        app:layout_behavior="com.drunkpiano.zhihuselection.utilities.ScrollingFavoriteFABBehavior" />
</android.support.design.widget.CoordinatorLayout>

请问问题出在哪里呢，谢谢

Answer 1

android.support.v4.widget.NestedScrollView를 제거하면 괜찮을 것입니다.

Answer 2

android.support.v4.widget.NestedScrollView을 제거한 다음 FloatingAcitonButton을 WebView 오른쪽 하단 끝에 고정하고 FloatingAcitonButton 안에 다음 코드

를 추가합니다. 으아악