Mobile device users often encounter unclear operating system version designations when they receive notifications about the availability of an update. The phrase "Android - what is it" sounds mysterious to those who do not follow the history of Google releases. In fact, we are talking about the ninth version of the most popular mobile OS in the world, which received the code name Pie (Pie). This release was a turning point in the development of the ecosystem, bringing changes to design, power management and data privacy.
The introduction of this version took place in 2018, but many devices still work on this platform or users are looking for information about it when buying used equipment. A key feature was the use of artificial intelligence to adapt the interface to the owner’s habits. The system has learned to predict which application you want to open next and optimize battery consumption without human intervention.
The transition to this platform requires an understanding of new safety and navigation rules. If your device offers an update to Android 9, it is important to know what changes await you so as not to get confused in the new menu. We will analyze in detail technical innovations, hidden functions and possible problems that you may encounter when migrating from older versions.
The history of the name and the main differences from previous versions
The tradition of naming Android versions after sweets was broken precisely after the release of “Pie”. For a long time, users have become accustomed to the alphabetical order: Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich, Jelly Bean, KitKat, Lollipop, Marshmallow, Nougat, Oreo. The ninth version ended this era, becoming the last public release with the "confectionery" name. Inside Google, the project had a working name Android P, which gave rise to many requests like “android p.”
The main visual difference was the abandonment of the classic navigation bar with three buttons in favor of gesture controls. This required users to relearn their finger motor skills. Instead of the usual pressing of the Home button, you now had to swipe up from the bottom of the screen. This change allowed us to increase the usable display area for application content.
⚠️ Attention: Gesture controls in Android 9 may conflict with some older launchers and custom skins from manufacturers. If navigation does not work correctly after the update, try returning to the classic three buttons in the system settings.
From an architectural point of view, Android 9.0 has received improved support for notches at the top of the screen, which became relevant during the boom of frameless smartphones. The system automatically hid the status bar in the notch area, preventing icons from overlapping the camera or sensors. In addition, support for displays with an aspect ratio of 18:9 and higher was introduced without the need for manual adjustment by developers.
Security was another important aspect. This version has increased control over application access to the microphone, camera and sensors. Now background apps could not simply record sound or track location without the user's knowledge. This was a response to the growing requirements for the protection of personal data in the mobile environment.
Digital well-being and control of time of use
One of the most notable functions presented in Piewas the tool Digital Wellbeing (Digital Well-being). Google recognized the problem of digital addiction and offered built-in tools for monitoring time spent on a smartphone. This function allows the user to see detailed statistics: how many hours are spent on social networks, games or calls.
It is important that the system not only collects data, but also allows you to set limits. You can set an app-specific timer, such as limiting Instagram use to 30 minutes per day. When the time is up, the application icon will turn gray and it will be more difficult to launch it again, which creates a psychological barrier to aimlessly scrolling the feed.
Do not disturb mode has also undergone significant changes and is called Do Not Disturb with advanced capabilities. A special “Veterinary” mode (Bedtime mode) has appeared, which not only silences notifications, but also switches the screen to black and white mode (Grayscale). This makes the display less attractive to the brain at night, helping you fall asleep faster.
Use the Vet Mode feature an hour before bed. A monochrome screen reduces melatonin production less than a bright color display, making it easier to fall asleep.
For parents or those who want to completely switch off, the ability to completely lock the device on a schedule has been added. This is not just call barring, but deep integration into the system, limiting visual stimuli. Usage statistics are available in the form of visual graphs, which helps to understand the real picture of content consumption.
Smart battery and adaptive power supply
The issue of autonomy has always been a pressing issue for mobile devices, and Android 9 Google has used machine learning to solve this problem. The Adaptive Battery (Adaptive Battery) function analyzes user behavior and prioritizes processor resources for the applications you use most often. Rarely used apps are put into deep sleep mode, which saves battery.
Previously, the operating system treated all running processes equally, which led to rapid discharge. Now, if you installed an application but did not open it for a week, the system will limit its background activity. This does not mean that notifications will stop coming, but the frequency of data synchronization will be reduced to a minimum.
| Energy saving function | Principle of operation | Impact on autonomy |
|---|---|---|
| Adaptive Battery | Limiting background activity of rarely used applications | Up to 30% savings in standby mode |
| App Standby Buckets | Distribution of applications by activity groups (Active, Working, Rare) | Reduced processor load |
| Screen brightness | Automatic adjustment to user habits, not light sensor only | Optimizing display operation |
| Energy saving mode | Disable vibration, background synchronization and visual effects | Critical extension of operation (up to 50%) |
In addition In addition, work with screen brightness has been improved. If previously the algorithm relied solely on the light sensor, then the Pie system remembers what brightness you manually set in certain conditions. Over time, the smartphone itself will offer the optimal backlight level, based on your time of day and location.
The adaptive battery requires training time (about a week) to begin to effectively save charge. Do not disable it immediately after the update.
Security, privacy and new permissions
Data security has become a priority in the ninth version. In Android 9 a ban was introduced on microphone, camera and sensor access for applications running in the background or in a standby state. This closed a loophole that some spyware and legitimate trackers used to collect information without the owner's knowledge.
There was also protection against theft by reboot. Previously, an attacker could simply reboot a stolen phone and gain access to some data or disable protection. After a reboot, the device now requires a PIN, pattern, or password before allowing connections to cellular networks or the use of biometrics.
- 🔒 Protecting confirmations: Critical actions, such as changing security settings or accessing encryption keys, require additional authentication.
- 📡 Limiting Wi-Fi scanning: Applications are now prohibited from constantly scanning available Wi-Fi networks in the background, which protects the user's geolocation from tracking.
- 📞 Blocking calls: The system has built-in native functionality for identifying spam and blocking unwanted numbers without installing third-party applications.
Another important change was the requirement for the target API level (targetSdkVersion). Applications developed for older versions of Android may not work correctly or not launch at all if they were not updated by the developers. This forced the market to clear out outdated and unsafe software.
⚠️ Attention: Google Play policies changed with the release of Android 9. Old applications that have not been updated to meet new security requirements may be removed from the store or work with restrictions. Always check the date of the last application update before installing.
Gamification and Easter eggs in the system
Despite the serious emphasis on productivity and security, the developers have not forgotten about the entertainment component. Each version of Android was famous for its Easter eggs, and Pie was no exception. To find the secret mini-game, the user had to repeatedly tap on the Android version in the About Phone menu.
Unlike previous versions, where Easter eggs were often static pictures or simple clickers, a full-fledged arcade game appeared in the ninth version. It was reminiscent of the classic game where you had to control a character collecting pieces of a pie while avoiding obstacles. It was a tribute to retro gaming and a way to lighten the mood for tech enthusiasts.
How to enable the Android 9 Easter egg?
Go to Settings → System → About phone → Tap 7-10 times on “Android Version”. A large letter P will appear. Click on it, then quickly click on the pie logo that appears until the game opens.
In addition to the game, the system has new emoji and stylistic changes in the settings icons. The interface became flatter, using rounded corners and pastel colors, in keeping with design trends of the time. Even the lock screen received a new clock and unlock animations.
Surprises were also prepared for developers in the form of new opportunities for creating adaptive icons and improved support for various form factors. This made it possible to create a more beautiful and consistent interface across different applications, which ultimately improved the user experience for everyone.
Is it worth upgrading or is it better to stay on the old version
The issue of updating to Android 9 is relevant for owners of devices produced in 2016-2018. On the one hand, new security features and battery optimization are strong arguments in favor. On the other hand, on old hardware, the new system may work slower due to increased resource requirements.
If your smartphone has less than 2 GB of RAM, the update may lead to a slower interface and more frequent unloading of applications from memory. In this case, sometimes it is more advisable to stay on stable Oreo or even Nougatif the device manufacturer no longer releases security patches.
☑️ Ready to upgrade to Android 9
However, if the device has a power reserve (4 GB RAM and a modern processor), failure to update deprives you of important protection functions against viruses and scammers. Many modern banking applications and instant messengers are gradually stopping support for versions below version nine, which will make the phone useless for important tasks.
Before making a decision, it is recommended to read user reviews of your particular phone model on specialized forums. It often happens that a specific firmware from a manufacturer contains errors that are not present in “pure” Android. In such cases, it is better to wait for the correct update or install custom firmware if you have sufficient skills.
⚠️ Attention: The update process may take from 30 minutes to 2 hours. Make sure you have a stable Wi-Fi connection and your phone won't die in the process. Interrupting the installation may lead to the device becoming bricked.
Frequently asked questions (FAQ)
Is it possible to roll back from Android 9 to an older version?
Officially, this possibility is not provided by the manufacturers. Rollback is only possible through the complex procedure of flashing the device with unlocking the bootloader, which voids the warranty and requires technical knowledge. It is easier for an ordinary user to reset the settings to factory settings if the new version does not work correctly.
Why does the battery drain quickly after an update?
In the first days after the update, the system indexes files and optimizes applications in the background. This is normal. Usually, after 3-5 days of active use, the charge consumption stabilizes, and the Adaptive Battery function begins to work in full force.
The Home button has disappeared, how can I go back?
In Android 9, gesture control is enabled by default. To return to the main screen, you need to swipe (drag your finger) from the bottom edge of the screen up to the center. To open the list of recent applications, you need to swipe up and hold your finger in the middle of the screen.
Does Android 9 support a dark theme?
A full-fledged system dark theme, like in Android 10, is not here yet. However, Android 9 introduced support for dark themes for individual applications and settings, as well as a function to force the interface into dark colors through the developer menu (Force Dark Mode), but this may not work correctly.
Is it safe to use Android 9 in 2026-2026?
Using Android 9 is becoming increasingly risky since Google stopped releasing regular security updates for this version several years ago. It is suitable for basic tasks (calls, offline games), but for online banking and working with confidential data it is better to use more recent versions of the OS.