ProgressBar没有出现在位于Fragment中的WebView中，如何在WebView android中显示ProgressBar？

<ProgressBar
    android:id="@+id/progressBar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    style="?android:attr/progressBarStyleHorizontal"
    android:indeterminate="false"
    android:max="100"
    android:progress="0" />

WebView webView = view.findViewById(R.id.webView);
ProgressBar progressBar = view.findViewById(R.id.progressBar);

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onProgressChanged(WebView view, int newProgress) {
        progressBar.setProgress(newProgress);
        if (newProgress == 100) {
            progressBar.setVisibility(View.GONE);
        } else {
            progressBar.setVisibility(View.VISIBLE);
        }
    }
});

progressBar.setVisibility(View.VISIBLE);