如何在android WebView中使用自定义滚动条滚动？

<style name="CustomScrollbar">
    <item name="android:scrollbarThumbVertical">@drawable/custom_scrollbar_thumb</item>
    <item name="android:scrollbarTrackVertical">@drawable/custom_scrollbar_track</item>
</style>

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FF0000" />
    <corners android:radius="5dp" />
</shape>

<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#CCCCCC" />
    <corners android:radius="5dp" />
</shape>

WebView webView = findViewById(R.id.webView);
webView.setVerticalScrollBarEnabled(true);
webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
webView.setScrollbarFadingEnabled(false);
webView.setScrollBarSize(10);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
    webView.setScrollBarColor(Color.RED);
}

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
    webView.setEdgeEffectColor(Color.RED);
}

webView.setOverScrollMode(View.OVER_SCROLL_NEVER);
webView.setNestedScrollingEnabled(false);

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    webView.setOnScrollChangeListener(new View.OnScrollChangeListener() {
        @Override
        public void onScrollChange(View v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {
            // 自定义滚动条的滚动逻辑
        }
    });
}