fix android crash when pausing or resuming video on APIs lower than 24.

[juliocbcotta]

Description

This PR fixes a crash when pause/resume methods are called in APIs lower than 24 on Android.

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[mklim]

Thanks for the fix! LGTM. It's unfortunate but I don't think we could add a meaningful test for this as-is since it depends on a specific Android version and we don't have working JUnit tests in the plugins.

I filed flutter/flutter#39499 to try and avoid errors like this in the future. @bparrishMines this is something to keep in mind with the refactor, I think ideally we'd probably want better behavior here instead of just failing to pause and resume.

[juliocbcotta]

Thanks for the fix! LGTM. It's unfortunate but I don't think we could add a meaningful test for this as-is since it depends on a specific Android version and we don't have working JUnit tests in the plugins.

I filed flutter/flutter#39499 to try and avoid errors like this in the future. @bparrishMines this is something to keep in mind with the refactor, I think ideally we'd probably want better behavior here instead of just failing to pause and resume.

I think we can add a test, but it will require to encapsulate the call to Build.VERSION.SDK_INT >= Build.VERSION_CODES.N in a wrapper class and the test needs to run in Robolectric or in a device.