If you do not want the WebView to reload on orientation changes simply override onConfigurationChanged in your Activity class:
@Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
}
And set the android:configChanges attribute in the manifest:
<activity android:name="..."
android:label="@string/appName"
android:configChanges="orientation|screenSize"
for more info see:
http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange
https://developer.android.com/reference/android/app/Activity.html#ConfigurationChanges