Question

In my application I use only WebView for loading index.html where running all app logic(html’s and javascript).

Where screen orientation changed, all data from JavaScript variables disappear.

How I can save all data when orientation changed?

Answer 1

You have to catch orientation changes and handle them by yourself, because by default the Activity gets recreated (and your WebView will be reloaded).

Add the android:configChanges attribute to your Activity in the AndroidManifest.xml

<activity ... android:configChanges="orientation|keyboardHidden|keyboard">

And override the onConfigurationChanged method in your Activity class.

@Override
public void onConfigurationChanged(Configuration newConfig){
    super.onConfigurationChanged(newConfig);
}

Also have a look here: Activity restart on rotation Android