I have a problem that when I click back button on a WebView, my
previous page losts all contents updated by JavaScript.
My steps in WebView was below:
- after Main page loaded, JavaScript starts update contents, like
refresh shoppings with links;
- user will see some shopping lists after updated;
- then user click each link will load new url in same WebView;
- user click back to Main page;
the problem is when user back to Main page, user cannot see any
shopping updated by JavaScript, they were gone!
I tried my page on IE and FF, both works fine, but had problem on
Android WebView. I'm not sure this issue caused by I'm not set some
settings correctly or other issues.
My sample code as below:
// set settings for webview
WebSettings webSettings = web.getSettings();
webSettings.setBuiltInZoomControls(true);
webSettings.setJavaScriptEnabled(true);
webSettings.setUseWideViewPort(true);
webSettings.setDomStorageEnabled(true);
webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
// call JavaScript to update shoppings
webView.loadUrl("javascript:addShoppings(" + str + ");");
// add interface for callback
webView.addJavascriptInterface(new
BusinessJavaScriptInterface(), "business");
final class BusinessJavaScriptInterface
{
public void businessListReceived()
{
... ...
}
}
// handle back key event
public boolean onKeyDown(int keyCode, KeyEvent event)
{
WebView web = (WebView) this.findViewById(R.id.browser);
if (web != null)
{
if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack())
{
web.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
return false;
}
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