网页视频不能自动播放

WebSettings ws = mWebView.getSettings();

ws.setMediaPlaybackRequiresUserGesture(false);

@Override
public void onPageFinished(final WebView webview, String url) {
//爱奇艺视频自动播放
//                webview.loadUrl("javascript:var video = document.getElementById(\"video\");\n" +
//                        "                video.play();");
                //优酷视频自动播放
                webview.loadUrl("javascript:var domElems=document.getElementsByClassName(\"x-video-button\");\n" +
                        "        domElems[0].click()");
    super.onPageFinished(webview, url);
}

注入js调用点击和播放