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How to Install and Use LineageOS: A Comprehensive Developer Guide to Android AOSP

Canopy DevTools

Developer lockywolf published a detailed technical guide covering the entire process of installing, building, and customizing LineageOS on Android devices, from AOSP build system internals to SELinux policy, binary extraction, and reverse-engineering proprietary camera apps. The guide covers the Soong/ckati/Ninja build system, Android architecture (Treble, APEX, Binder, VINTF, HAL), native debugging with LLDB and Ghidra, Smali patching, and practical examples on a OnePlus Snapdragon 8 Gen 2 device. It serves as a practical "missing manual" for developers building custom Android ROMs, porting devices, or developing system-level Android software in 2026.

Key Takeaways

  • Covers the full AOSP/LineageOS build system: Soong (Android.bp), ckati (Android.mk), Ninja, ccache, brunch/lunch commands, and device-specific module structure for Qualcomm sm8550 devices
  • Deep-dives into binary reverse engineering with Ghidra (decompiler + debugger), LLDB-over-ADB, Smali patching with apktool/JADX, and ddisasm for binary modification without offset corruption
  • SELinux section explains type definitions, seapp_contexts, neverallow rules, and hal_client_domain() macros — with concrete patches to run a privileged camera app in an isolated SELinux domain

Original source: lockywolf.net