How to save the state of an Android activity when the device is rotated?

Question

If I change the text of a TextView, and I rotate my screen 90°, the changes will be lost.

To avoid this, what are my options?

Accepted Answer

Use the methods onSaveInstanceState() and onRestoreInstanceState()

Accepted Answer

Implement the methods onRetainNonConfigurationInstance() and call getLastNonConfigurationInstance() during onCreate()

Accepted Answer

Manage the orientation change myself with the manifest configChanges attribute and the onConfigurationChanged() method

Answer

Set the keepContext attribute of the manifest to “true”, to force the conservation of the activity instance.

Question from the Android test