WebChromeClient

辅助WebView处理Javascript的对话框，网站图标，网站title，加载进度等

onCloseWindow(关闭WebView)

onCreateWindow()

onJsAlert (WebView上alert是弹不出来东西的，需要定制你的WebChromeClient处理弹出)

onJsPrompt

onJsConfirm

onProgressChanged

onReceivedIcon

onReceivedTitle

webView.setWebChromeClient(new WebChromeClient()
{
public void onProgressChanged(WebView view, int progress)
{
//progress加载的进度
}
);