Tips.Android.md

Android Tips

Linux Kernel

• The Linux Kernel documentation

  • https://docs.kernel.org/

• The Linux kernel user’s and administrator’s guide

  • https://docs.kernel.org/admin-guide/

Android OS

• Android Open Source Project

  • https://source.android.com/

• Android OS Documentation

  • https://source.android.com/docs/

• Explore the Android OS stack

  • https://source.android.com/docs/setup/about

• Android Release Notes

  • https://source.android.com/docs/whatsnew/release-notes

• Download the Android source

  • https://source.android.com/docs/setup/download

Android SDK

• https://developer.android.com/
• https://developer.android.com/studio/
• https://developer.android.com/studio/releases/platform-tools

Developer Mode

• Galaxy S8/S8+/S9/S9+: How to Enable/Disable Developer Options Mode
  • https://www.youtube.com/watch?v=B3SZut_kWXk

OS Upgrades

• Install Android 16 LineageOS 23 ON Galaxy S9 Plus
  • https://www.youtube.com/watch?v=BhVqr-kcbxY
    • Unofficial Port
    • Must Unlock Bootloader (turn ON OEM Unlocking)

Useful Apps

• http://rk4an.github.io/psiandroid/

  • https://github.com/rk4an/psiandroid

• Terminal Emulator for Android

  • https://play.google.com/store/apps/details?id=jackpal.androidterm&hl=en_US&gl=US
  • http://github.com/jackpal/Android-Terminal-Emulator/wiki
  • https://github.com/jackpal/Android-Terminal-Emulator/wiki/Android-Shell-Command-Reference
    • df diskspace

• Android Debug Bridge (ADB)

  • https://developer.android.com/studio/command-line/adb

• Device Info HW

  • Andrey Efremov
    • https://play.google.com/store/apps/dev?id=8319098749428609038&hl=en_US
    • https://github.com/andr7e
      • https://github.com/andr7e/DeviceInfoHW
    • https://www.appbrain.com/dev/Andrey+Efremov/
  • https://play.google.com/store/apps/details
    • https://www.deviceinfohw.ru/main/index.html
    • https://www.appbrain.com/app/Device%20Info%20HW/ru.andr7e.deviceinfohw
  • As of 2026-05-30: 4.5 stars, 1.36K reviews, 5M+ downloads
    • The APK download size is 3.62 MB. The latest version available is 5.25.0. The last update was on October 26, 2025.
  • Reviews:
    • https://gizmodo.com/download/device-info-hw
      • "Understand your Android device better with Device Info HW—a practical tool that reveals detailed hardware and system data, helping users check components, monitor performance, and troubleshoot issues with clear, easy-to-read information."
      • "Frequently used by advanced users, technicians, and developers, casual users commonly use Device Info HW to see the phone specifications, research battery behavior, confirm hardware post-repair, etc. The application focuses on data, but not optimization and cleaning."
      • "The reason people download Device Info HW is that it displays information not seen by the standard Android settings. Ever had a question about what powers your phone, what type of processor, what type of storage chip, etc.? This app puts all the information in one place."

Device Mounts

• Re: The following are the entries for my Samsung S9+ phone, running v10 of the OS

• /data

  • dev/block/dm-3

• /vendor

  • dev/block/dm-2

• /odm

  • dev/block/dm-1

• /cache

  • dev/block/bootdevice/by-name/cache

• /

  • dev/block/dm-0
  • The path /dev/block/dm-0 represents a virtual block device managed by the Linux Device Mapper (dm) layer in Android, most frequently associated with a read-only system partition enforced by dm-verity or an encrypted storage volume.

-/dev

• tmpfs

• /dev/pts

  • devpts

• /dev/usb-ffs/adb

  • adb

• /proc

  • proc

• /sys

  • sysfs

• /sys/fs/selinux

  • selinuxfs

• /sys/kernel/debug

  • debugfs

• /sys/kernel/dbug/tracing

  • tracefs

• /sys/fs/bpf

  • bpf

• /sys/fs/pstore

  • pstore

• /mnt

  • tmpfs

• /mnt/secure/asec

  • tmpfs

• /mnt/vendor/persist

  • tmpfs

• /mnt/vendor/persist

  • /dev/block/bootdevice/by-name/persist

• /mnt/vendor/efs

  • /dev/block/bootdevice/by-name/efs

• /mnt/vendor/dqmdbq

  • /dev/block/bootdevice/by-name/dqmdbq

• /mnt/shel/enc_emulated

  • /data/knox/secure_fs/enc_media

• /mnt/runtime/default/emulated

  • /data/media

• /mnt/runtime/read/emulated

  • /data/media

• /mnt/runtime/write/emulated

  • /data/media

• /mnt/runtime/full/emulated

  • /data/media

• /apex

  • tmpfs

• (need to finish adding entries, from Device Info HW app, under Mounts

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