//设置缓存模式
webView.getSettings().setCacheMode(WebSettings.LOAD_DEFAULT); 

private void initView() { 
 webview = (WebView) findViewById(R.id.faq_wv); 
 webview.loadUrl(url); 
 webview.setWebViewClient(new WebViewClient() { 
 @Override 
 public boolean shouldOverrideUrlLoading(WebView view, String url) { 
  view.loadUrl(url); 
  return true; 
 } 
 }); 
 WebSettings settings = webview.getSettings(); 
 settings.setJavaScriptEnabled(true); 
 settings.setCacheMode(WebSettings.LOAD_CACHE_ELSE_NETWORK); 
} 
/* 改写物理按键返回的逻辑 */ 
@Override 
public boolean onKeyDown(int keyCode, KeyEvent event) { 
 if (keyCode == KeyEvent.KEYCODE_BACK && webview.canGoBack()) { 
 // 返回上一页面 
  webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE); 
 webview.goBack(); 
 return true; 
 } 
 return super.onKeyDown(keyCode, event); 
}