How to use your Samsung phone as a secondary monitor for your Windows PC

One UI has a feature called Second Screen that lets you mirror/extend your Windows PC's screen onto your Samsung device. However, this feature is officially only available on the Galaxy Tab S7, Tab S8, and Tab S9 series.

Fortunately, the feature is still there on Samsung phones and foldables like the Galaxy Z Fold 5, but you need to access its hidden settings page in order to use it. Here's how.

1) Download the SystemUI Tuner app from Google Play, go through its setup process, tap the "System" dropdown on the leftdown then select "Lock Screen". Tap on "Lock Screen Shortcuts", then pick either the Left or Right shortcut. Look for "Smart View" in the app list and then pick the option that says SecondScreenActivity.

OR

2) Run the following ADB command:

adb shell "settings put system lock_application_shortcut '1;com.samsung.android.smartmirroring/com.samsung.android.smartmirroring.player.SecondScreenActivity;1;null;'"

After you do #1 or #2, go to the lock screen and open the shortcut you just set. It should launch the Second Screen settings page! The reason this works is because, although the Second Screen activity is unexported, the lock screen is part of SystemUI which runs as the system user which can launch unexported activities.

Now while you're on this page, hit Windows + K on your PC to bring up the Cast menu. You should see your device appear here. Pick it, and wait for it to connect. Once it connects, open up the Cast menu again and check the "allow mouse, keyboard, touch, and pen input from this device" if you want to be able to send inputs from your phone. That's it!

Kudos to FragmentedChicken for the tip! Let me know if you find other useful activities you can launch with this lock screen shortcut method.

Here are some of the new features in Android 14 that Google is highlighting as part of a push notification sent to users after upgrading.

1) New monochrome color theme options. Make your device look sleek and beautiful with dynamic monochrome color options.

2) Sync your health and fitness apps. Use Health Connect to sync health and fitness apps to see and understand your health data in one place, and also control the privacy of these apps.

3) Control your location sharing. Get easy-to-understand updates about how certain apps use your data, to help you decide which data you agree to share with them.

4) Don't miss a thing with Flash notifications. A new Accessibility setting lets you turn on flashes from your camera or screen light to make sure you ever miss a notification.

5) Control magnification options in a new settings panel. Pinch to zoom in and out of any part of your screen. Open the new Magnifier settings to control how much of your screen you'd like to magnify, and go to Accessibility settings to keep your magnifier open when switching between apps.

6) New ways to connect and interact with hearing aids. Your Accessibility settings now offer easy new ways to set up your hearing aids and route audio to different outputs. There's also a new shortcut to your hearing aids' controls.


This notification was sent to my ASUS Zenfone 10 after I updated to Android 14. It's part of the "Android Upgrade Party" initiative.

"A major Android operating system upgrade can be an underwhelming experience for your users. The Upgrade Party flow increases user engagement and helps users understand how to navigate their newly refreshed OS."

Since OEMs can customize the flow to remove "irrelevant" features, there may be more pages that I haven't seen. Of course, there are a lot more changes in Android 14 than what's shown in this flow.