支持Android webview修改meta

webview.setVerticalScrollbarOverlay(true); //指定的垂直滚动条有叠加样式
WebSettings settings = webview.getSettings();
settings.setUseWideViewPort(true); //设定支持viewport
settings.setLoadWithOverviewMode(true);
settings.setBuiltInZoomControls(true);
settings.setSupportZoom(true); //设定支持缩放