WebView显示不全，有时候正常，有时候不正常

WEbView加载数据的时候，有时候显示正常，有时候显示不正常，如图，请大神帮忙解决下，代码如下：mNewsDocWeb = (WebView) findViewById(R.id.wb_news_doc_info);
mNewsDocWeb.getSettings().setJavaScriptEnabled(true);
mNewsDocWeb.getSettings().setLayoutAlgorithm(
LayoutAlgorithm.NARROW_COLUMNS);
mNewsDocWeb.getSettings().setUseWideViewPort(true);
mNewsDocWeb.getSettings().setLoadWithOverviewMode(true);
mNewsDocWeb.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
mNewsDocWeb.setWebChromeClient(new WebChromeClient());
mNewsDocWeb.loadUrl(webUrl);

mNewsDocWeb.setWebViewClient(new mNewsWebClient());
mNewsDocWeb.addJavascriptInterface(this, "news");

<?xml version="1.0" encoding="utf-8"?>
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/act_default"
android:orientation="vertical" >

<include layout="@layout/title_layout" />

<WebView
    android:id="@+id/wb_news_doc_info"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layerType="hardware" />

setCacheMode设置有误！