Activity not recreated on rotation

Issue

1. Activity 1 created and shown (portrait mode)
2. Activity 2 created and shown (portrait mode)
3. Rotation (to landscape mode). Activity 2 is recreated as expected
4. Press Back
5. Activity 1 is shown in portrait mode (landscape mode is expected with Activity 1 recreation)

Why activity is not recreated?

PS. No orientation set or onConfigurationChanged() overriden for Activity 1 in AndroidManifest.xml

Solution

For some reason my colleague added activity.setRequestedOrientation(..) long time ago and it prevented activity from changing orientation.

Answered By - 4ntoine