Treble Check – Treble Compatibility Checking App – Project Treble support means that you can now test how Android P works on your smartphone by downloading the GSI build. Let’s find out if your smartphone supports Project Treble or not. To do this, just download one app. It’s called Treble Check. If you launch the app, it will display information about your smartphone’s support for Project Treble. As mentioned above, if the device supports this feature, you can safely install the GSI version of Android P and test its operation on the device.