Q:

Android getSupportedVideoSizes always returns null

I need some help with the MediaRecorder class on Android.
I try to use getSupportedVideoSizes to get the list of supported video sizes, but it always returns null.
In testing, the following devices return null when getSupportedVideoSizes is queried:

Galaxy Nexus (Android 4.2)
HTC One Mini (Android 4.4.2)
HTCEVOV4G (Android 4.0.3)

A:

The documentation for Camera.getSupportedVideoSizes() which reads,

Returns
  a list of Size object if camera has separate preview and video output; otherwise, null is returned.

is not entirely clear. However, it means that if Camera.getSupportedVideoSizes() returns null, then the camera's supported preview sizes and video sizes are the same; in this case,  to get the list of supported video sizes, use Camera.getSupportedPreviewSizes().
Sample code:
public List<Size> getSupportedVideoSizes(Camera camera) {
    if (camera.getParameters().getSupportedVideoSizes() != null) {
        return camera.getParameters().getSupportedVideoSizes();
    } else {
        // Video sizes may be null, which indicates that all the supported 
        // preview sizes are supported for video recording.
        return camera.getParameters().getSupportedPreviewSizes();
    }
}

