Why has `android:screenOrientation=" behind"` no effect in android 4.1.2?

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The android:screenOrientation=" behind" attribute is used to specify that the activity should have the same orientation as the activity that launched it, with the screen orientation locked.

However, this attribute is deprecated as of API level 18, which means that it is no longer recommended to use it in newer versions of Android. Instead, you should use the android:screenOrientation="unspecified" attribute, which allows the system to choose the orientation based on the device's default settings.

That being said, if you are still using android:screenOrientation=" behind" in an app targeting API level 18 or higher, it may not have the desired effect. This is because the behavior of this attribute has changed in more recent versions of Android, and it is now only respected if the activity being launched is already in the same orientation as the activity that launched it.

If you want to ensure that the launched activity has the same orientation as the activity that launched it, you can use ActivityInfo.SCREEN_ORIENTATION_BEHIND constant in your code instead of using the XML attribute. However, keep in mind that this constant is also deprecated and may not work as expected on newer versions of Android. It is recommended to use the recommended approach of android:screenOrientation="unspecified" instead of android:screenOrientation=" behind" attribute is used to specify the screen orientation that should be used when the device is rotated to an orientation that is behind the current orientation (180 degrees opposite).

However, it's possible that this attribute may not have any effect in certain versions of Android, such as 4.1.2. This could be due to a number of reasons:

>> The attribute may not be supported in that particular version of Android.

>> The device manufacturer may have customized the version of Android running on their devices, which could potentially override or ignore this attribute.

>> There may be other factors at play, such as system settings or other configuration options, that are preventing the attribute from being applied.

>> To determine the exact reason why android:screenOrientation=" behind" is not having any effect in your specific case, you may need to do some additional testing and debugging. It may also be helpful to check the official Android documentation to see if there are any known issues or limitations related to this attribute in the version of Android you are working with.