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I'm using the API 17 emulator to test a page containing a web view.
I can't reproduce this same issue on KitKat, Lollipop, or Gingerbread... I can only reproduce this issue on Jellybean and Ice Cream Sandwich so far...
I've also confirmed this is an issue on an actual Nexus 7 device running Jellybean, so it's not an emulator-only problem.
Note: I'm not particularly interesting in using something like android:configChanges="orientation|keyboardHidden". As I understand it, this might solve my rotation issues, but the problem may still resurface if the activity state needs to be restored for other reasons.
Step #1: Load the WebView Normally
Step #2: Submit the Form (uses HTTP Post Method)
Step #3: Rotate the screen to trigger webview.restoreState - error occurs
Here is some sample code to go along with my question. The code is in Mono C# but should be very nearly identical to Java.
public class MainActivity : Activity
{
WebView webview;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
webview = new WebView(this);
SetContentView(webview);
if (bundle == null)
webview.LoadUrl("http://2-dot-npwc-services.appspot.com/test-post.jsp");
else
webview.RestoreState(bundle);
}
protected override void OnSaveInstanceState(Bundle bundle)
{
base.OnSaveInstanceState(bundle);
webview.SaveState(bundle);
}
}
The sample HTML page that is performing the POST method looks like this:
<html>
<form action="test-post.jsp" method="post">
<input type="text" name="test" value="test"/>
<input type="submit"/>
</form>
<p>You entered: <%=request.getParameter("test")%></p>
</html>
326
The browser it's doing good (although it's a pain for us), you have 2 ways:
1- Keeping the webView instance and restoring the state, adding like you said android:configChanges="orientation|keyboardHidden"
2- Or reloading the post petition again.
I take the first one and if i get some error, i will go back to the last page. Doing static content, so on rotation no network or a new petition it's needed on each rotation, which if not, on server side will be a pain too.
To achieve the "if error go back" you need to set a Custom WebClient and override this method
webview.setWebViewClient(new WebViewClient() {
@Override
public void onReceivedError(WebView webView, int errorCode, String description, String failingUrl) {
if ( webView.canGoBack() ) {
Toast.makeText(MainActivity.this, R.string.error_web, Toast.LENGTH_SHORT).show();
webView.goBack();
}
}
});
You can filter by errorCode to go back when you want, in some kind of error you can go back on other do other thing. I dont' know which error raises this POST request or if you want more filter on other situations, so i'm sure you can do a fine grain filter using it.
Edit: You have here the possible error codes WebViewClient Error Codes
I hope this helps.
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