How to check Bluetooth audio codecs on Android 5.0
The only way to check I found so far is in the Android Developer Options.
On some devices there is an entry named &quot;Bluetooth-Audio-Codec&quot;. If this list contains an entry with &quot;aptX&quot; as shown in the following screen shot it should be sure that the device supports aptX:

The screen shot is from an Android 9 tablet. Not sure about older Android versions. It may happen that you don't have no &quot;Bluetooth-Audio-Codec&quot; entry in the Developer Options menu, in that case this method does not work for you.