How to find out which applications are active on Android: hidden and background processes

Have you ever noticed that your smartphone suddenly starts to heat up and the battery drains many times faster than usual? The reason often lies in background applications, which continue to work even after closing. Android manages processes automatically, but some apps are cleverly disguised, consuming resources in stealth mode. In this article, we will look at how to identify all active applications - from obvious ones to those that are hiding behind system services.

The problem is that standard Android tools do not show everything. For example, the Recent Apps menu only shows apps that you manually launched. But what about servicesthat start when the system boots or according to a schedule? Or with applications that masquerade as system processes? We will look at both basic methods (available without root access) and advanced ones - for those who are ready to dive into technical details.

1. Standard Android tools: what you can see “out of the box”

Let's start with the simplest thing - the built-in functions of the operating system. Even without installing additional apps, you can get basic information about running processes.

The most obvious way is to open multitasking menu. On most devices, all you have to do is swipe up from the bottom and hold your finger on the screen (or click on the square icon in the navigation bar). Here you will see a list recent applications, but it is important to understand: these are not all active processes, but only those with which you interacted directly. Many background services will not appear here.

• 📱 On Android 12+: swipe up from the bottom → hold → a list of applications will appear. Swipe left/right to see everything.
• ⚙️ Through Settings: Go to Settings → Applications → All applications, then sort by "Battery Usage" - the most active will be at the top.
• 🔋 Battery monitor: Settings → Battery → Usage batteries shows applications that consume energy in the background.

The limitation of this method is the lack of detail. You will see that Google Play Services consuming 15% of the charge, but you will not understand which process within this service is to blame. For in-depth analysis, other tools will be required.

2. Hidden processes: how to find what is not visible in multitasking

Android hides many system and background processes from the user so as not to overload the interface. However, some of them may be unnecessary or even harmful. To detect them, you will need access to task manager (not to be confused with the multitasking menu!).

On devices with pure Android (Pixel, Motorola) the path is as follows: Settings → System → For developers → Processes (if the "For Developers" item is not active, turn it on by clicking 7 times on the build number in Settings → About phone). Here you will see a complete list of running processes, sorted by RAM consumption. Pay attention to the columns:

• 🔹 UID —a unique user identifier (helps distinguish system processes from third-party ones).
• 🔹 PID — process identifier (needed for forced closing via ADB).
• 🔹 RAM — amount of RAM used. Processes consuming >100 MB in the background are worth checking.

Important: do not close processes named system_server, android.process.media or com.android.phone —these are critical system services. Their forced termination may lead to a reboot of the device.

What to do if the process does not close?

If after clicking "Stop" the application continues to work, this may indicate:

1) Virus software (check with an antivirus);

2) System application with elevated rights (requires disabling via ADB);

3) Error in the cache (clearing application data in the settings will help).

3. Using ADB: advanced monitoring for technical users

If standard methods do not provide a complete picture, a debugging tool that allows you to interact with the system at a low level will come to the rescue. Using it, you can get a list Android Debug Bridge (ADB) is a debugging tool that allows you to interact with the system at a low level. You can use it to get a list all of active processes, including those that are hidden from the user.

To get started with ADB:

1. Install Platform Tools on your PC.
2. Enable USB debugging in the developer settings on your phone.
3. Connect the device to the computer and run the command:

adb shell ps -A | grep -E 'u0_a|system'

This command will display all processes running as the user (u0_a) and the system. To filter only third-party applications, use:

adb shell dumpsys package | grep "Package \[.*\]"

To force close a suspicious process (for example, with PID 1234):

adb shell kill 1234

4. Third-party monitoring applications: TOP-3 utilities

For users who are not ready to deal with ADB, there are specialized applications. They offer a convenient interface for analyzing active processes, often with additional features like automatically clearing RAM or blocking startup.

Application	Features	Cons	Link
Greenify	Hibernation background applications, work without root, low battery consumption	Not all processes can be “slept”, restrictions on new versions of Android	Google Play
Servicely	Blocking autorun, detailed statistics for each process, root support	Complicated interface for beginners, some functions are paid	Google Play
Simple System Monitor	Widget for the notification panel, real-time CPU/RAM monitoring, no advertising	Minimalistic functionality, no in-depth analysis of processes	Google Play

When choosing a utility, pay attention to the permissionsthat it requests. If a monitoring application requires access to SMS or contacts, this is a reason to be wary. Also check reviews: some "optimizers" themselves become a source of problems by running background processes to collect data.

Check reviews for the latest version|View date of last update|Check permission requests|Read privacy policy-->

5. Autorun analysis: how to prevent unnecessary activity

Many applications launch automatically when the phone is turned on, connected to Wi-Fi or charging. This is one of the main reasons background activitythat is difficult to track. Some firmwares (for example MIUI or EMUI) have built-in tools for managing autorun:

• 🔄 Xiaomi (MIUI): Settings → Applications → Manage autorun.
• 🔄 Huawei (EMUI): Settings → Battery → Launching applications.
• 🔄 Samsung (One UI): Settings → Device care → Battery → Background activity.

On pure Android or devices of other brands (for example Realme, Oppo), you may need third-party software like Autostarts (requires root) or MacroDroid (works without root, but with limitations). These tools show which events trigger certain processes - from connecting headphones to changing geolocation.

Beware of disabling autorun for system applications (for example, com.google.android.gms). This may cause problems with Google services, notifications, or synchronization.

6. Searching for hidden threats: how to recognize masquerading applications

Some malware disguises itself as system processes or copies the names of legitimate services (for example, com.android.google instead of com.google.android). To identify them, compare the list of active processes with the standard set for your version of Android.

Here are signs of suspicious activity:

• ⚠️ A process with a name similar to the system one, but with a typo (for example, android.system.server instead of system_server).
• ⚠️ An unknown application in the startup list that you did not install.
• ⚠️ Process consuming >5% CPU in the background (checked via ADB or Simple System Monitor).

To verify the authenticity of the process:

1. Find its PID via adb shell ps | grep "process_name".
2. Run adb shell cat /proc/[PID]/cmdlineto see the full path to the executable file.
3. Compare the path with standard directories (/system/bin/, /data/app/).

⚠️ Attention: Some legitimate applications (for example, banking or antivirus) can mask their processes to protect against hacking. Do not delete them without making sure authenticity of the threat.

7. Optimization: what to do with found active processes

Having discovered unnecessary background processes, do not rush to close them all:

• 🛑 Stop the process: in the application settings, click. Stop cache
• 🚫 Disable autorun: Via battery settings or third-party utilities.
• 🗑️ Clear cache: V Settings → Applications → [Select application] → Memory → Clear cache.
• ❌ Delete application: if it is not needed at all.

For system applications (which cannot be deleted by standard means) use:

adb shell pm uninstall -k --user 0 package name

This command will disable the application for the current user without deleting files (which is safer than completely deleting).

⚠️ Attention: Disabling system applications like com.android.vending (Google Play Market) will lead to Google services not working. Make a backup copy before proceeding!

FAQ: Frequently asked questions about monitoring active applications

Is it possible to completely disable background activity?

No, this is not possible without compromising functionality. Android uses background processes for notifications, syncing, updates, and system tasks. However, you can limit activity of unnecessary applications through the battery settings or utilities like Greenify.

Why does the application appear in the active list again after closing?

This happens due to the mechanism caching processes Android. The system stores applications in memory for quick re-launch. To completely stop it, you need to disable autorun or use the command adb shell am force-stop package name.

How to check application activity on Android Go?

On devices with Android Go (for example, Nokia 1 or Samsung Galaxy J2 Core) functionality is limited. Use lightweight utilities like Simple System Monitor or check through Settings → Applications → Battery Usage. ADB also works, but some commands may not be available due to OS optimizations.

Is it safe to use task killers?

No, task killers often do more harm than good. They forcefully close processes, which forces Android to restart them again, wasting additional resources. The exception is manual control via ADB in rare cases.

How to find out which application is using the camera/microphone in the background?

On Android 12+ go to Settings → Privacy → Permission Manager. Apps that have recently used your camera, microphone, or geolocation are displayed here. For a deeper analysis, use Access Dots (shows sensor access indicators).