verification:** We have seen some bad actors begin to distribute malicious, unofficial versions of the Android OS that secretly compromise device integrity. To combat this, we are introducing Android OS verification in Android 17. Launching initially on Pixel devices, this feature helps you verify that your device is running an official, widely distributed build.
* **Enabling Certificate Transparency (CT) by default:** CT is now enabled by default for apps targeting Android 17, enhancing network security by ensuring all TLS certificates are publicly logged. 
* **Blocking cross-profile loopback traffic:** Cross-profile loopback traffic is no longer permitted by default, increasing network isolation and security between personal and enterprise work profiles.
* **Post-Quantum Cryptography (PQC):** The advent of quantum computing puts the current public-key cryptography we've relied on for decades at risk, potentially compromising everything from bank transfers to trade secrets. To prepare for the quantum computing era, we're introducing a comprehensive architectural upgrade to the Android operating system, starting in Android 17.  We’re integrating the [NIST Post-Quantum Cryptography (PQC)](https://blog.google/security/security-for-the-quantum-era-implementing-post-quantum-cryptography-in-android/) standards deep into the platform, establishing a new, quantum-resistant chain of trust that secures the platform continuously from the moment the OS powers on to when apps are executed.

# 📸 Improvements to your Android media experience

*tl;dr Android 17 levels up your multimedia experience by letting you easily record reaction videos without a green screen, decoupling your Assistant and media volumes for independent control, putting a stop to unexpected background audio, and delivering color-coded Live Updates alongside advanced Bluetooth, camera, and hearing device enhancements.*

**Screen Reactions**

In Android 17, we’re making it easier to record yourself and your screen at the same time with Screen Reactions. Available first on Pixel, this feature shows your face in a floating overlay on top of the screen. Android automatically puts the overlay at the bottom and cuts out the background so you don’t need a green screen, but you can move or resize the camera view and change the background color before or during a recording. Use this feature to make a reaction video, record a tutorial, or give feedback on a new app or document!

https://reddit.com/link/1u7l1cw/video/pdevsbhnko7h1/player

 

In addition, we’ve revamped the screen recording experience to add a floating toolbar that provides easier access to recording controls and capture settings. When you’re done recording, you can immediately view, edit, delete, or share your video.

**Dedicated Assistant volume stream**

Android 17 introduces a dedicated volume stream for Assistant apps. This change decouples Assistant audio from the standard media stream, allowing users to control both volumes independently. This enables scenarios like muting media playback while maintaining audibility for Assistant responses, and vice-versa.

**Background audio hardening**

Beginning in Android 17, apps cannot play audio, steal audio focus, or change the volume unless they are visible or have a foreground service. These restrictions on [background audio interactions](https://developer.android.com/about/versions/17/changes/bg-audio) reduce unintentional buggy experiences and ensure that these actions are started intentionally by the user.

**Enhancements to Live Update notifications**

Live updates provide a summary of important updates so users can track progress without opening the app. The system promotes Live Update notifications so they appear more prominently in the notification drawer, on the lock screen, and on the status bar. 

With Android 17, we’re introducing a metric style template designed specifically for health and fitness apps, timers, and travel apps. In addition, developers can use the new Semantic Coloring API to visually convey state changes, providing highly