How to Enable PS4 Remote Play on Your Android Device and Play with DualShock 4

1. First things first, you want to make sure you enable Magisk by flashing it through your Custom Recovery (TWRP). You can find the necessary files plus installation instructions on this thread. Magisk is good to have regardless of whether you want or need this mod, as it’s one of the better systemeless root solutions out there.
2. Once you have Magisk set up, go to the “Downloads” tab on the sidemenu, and search for the “Sony Framework” module (v1) by Seyaru. This will install the necessary foundation to use Remote Play as if you had a Sony Android device. After it is done downloading, it will ask to install and enable the module, which needs a reboot. You can either reboot now, or further down this guide as a reboot will be necessary later on as well.
3. Now that you have the Sony Framework, you need to check your build.prop in order to make your device compatible with Remote Play version 2.0.0. Sony has made previous versions  you can remedy this through a build.prop edit: simply add (or replace if you have a similar line with a different value) this line ro.build.tags=release-keys. Alternatively, you can install the Magisk module provided by leolawliet in order to add it to your build.prop Also, a recent Magisk update has reportedly made it so that no changes are necessary. Either way, and as listed here, there are a couple of ways in which you can approach this should it not work for you from the get go. Regardless of which path you take, be sure to enable the Framework module and that the build.prop change is there, and reboot your device.
4. Search the Play Store for “Remote Play” — you should see the application, though you might not be able to install it (results varied for me). If that’s the case, you need to download the APK either through an APK downloader website or browser extension (check MD5 sum to verify the APK’s integrity). Once you have installed Remote Play, go to Magisk again, and under “Settings” enable “Magisk Hide”. After that, a new menu becomes available in the side panel. Go to that menu and then search for your PlayStation apps, then “hide them”. This way, you won’t get a root access prompt when launching Remote Play.
5. Now here is where it gets tricky. Depending on your ROM, you might either not be able to send any input through the DualShock 4 at all, or be able to use it as a gamepad but not as a Remote Play controller (as was the case for me on LineageOS). Luckily, there is an (admittedly awkward) universal workaround:

2.         Make a second PSN account — it doesn’t need to have a subscription, it just needs to be on your PS4
3.         Make sure Remote Play is configured on your PS4 and on that account (it shouldn’t need extra fidgeting)
4.         Connect to this new dummy account through Remote Play, while your main PS4 Account is in the foreground
5. 
   
6. This will make it so that your DualShock 4 will remain connected to the PlayStation 4 and be able to operate it while your screen is casting to your device. The only limitation is, of course, that you’ll be constrained to bluetooth range. I found that the range wasn’t much of a problem, though walls can get in the way and when being two or three rooms and walls apart from the console, microphone input and output would start to stutter and cut out (input lag wouldn’t noticeably vary with changes in distance, though). Hopefully you won’t need this workaround at all.

Enjoy!

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