在Android webview中无法播放iframe视频

webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onPermissionRequest(PermissionRequest request) {
        request.grant(request.getResources());
    }
});

webView.getSettings().setJavaScriptEnabled(true);
webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url) {
        super.onPageFinished(view, url);
        view.loadUrl("javascript:(function() { var videos = document.getElementsByTagName('video'); for(var i=0;i<videos.length;i++){ videos[i].play(); } })()");
    }
});