Android - ActionBar not resizing with onConfigurationChanged ( AppCompat )

Question

In my application manifest I've add android:configChanges to prevent activity reload/restart on rotate

<activity
  android:name=".MainActivity"
  android:label="@string/app_name"
  android:configChanges="orientation|keyboardHidden|screenSize" >

it works, but supportActionBar ( I'm using AppCompat ) preserves his height with small font size.

ActionBar should be bigger in portrait and smaller in landscape, but it keeps the initial value:

• if I start in landscape, the actionbar stay thin in portrait
• if I start in portrait, the actionbar stay big in landscape

Removing android:configChanges="orientation|keyboardHidden|screenSize" is the only solution I've found, but the app restart on rotate, and I need to preserve application content

Starting in portrait

Starting in landscape

Starting in landscape and rotating screen to portrait (small action bar and small font height)

Answer 1

By setting android:configChanges="orientation|keyboardHidden|screenSize"

You declare that you will handle these config changes by yourself. In normal cases, you should not set that, and let Android recreate your Activity.

Edit:

If you want to keep the line android:configChanges, you have to override onConfigChanged() and change everything needed by yourself, e.g. the size of the ActionBar/ToolBar.