Android Architecture Layers
Explore the complete Android Architecture layer by layer, from the Linux Kernel to Applications. Gain a deep understanding of AOSP internals with practical explanations and interview-focused insights.
Posts in this series
Explore the Linux Kernel's role in Android architecture. Understand process management, memory, security, Binder IPC, Wakelocks, Low Memory Killer, and why Linux became Android's foundation.
Discover how the Hardware Abstraction Layer (HAL) solves Android's hardware fragmentation problem, enabling a single Android OS to run across thousands of different devices. Learn the role of HAL, Project Treble, HIDL, AIDL, Binder IPC, and how Android seamlessly communicates with hardware components like cameras, GPS, audio, and sensors.
Explore Android's Native C/C++ Libraries and Android Runtime (ART) to understand how apps achieve high performance, efficient memory management, and seamless execution. Learn the roles of JNI, Bionic, SQLite, OpenGL ES, AOT, JIT, and Garbage Collection in Android's architecture.
Most Android developers use the Java API Framework every day — but few understand what actually happens when they call startActivity(). In this deep dive, we look at the framework from a platform engineer's perspective: how System Services and Manager classes form a client-server architecture, why Binder IPC is the glue holding it all together, and how the boot sequence — from init to Zygote to SystemServer — brings it all to life. By the end, a single method call will never look the same again.
Discover how Android system apps differ from regular user apps and why they have privileged access to the operating system. In this article, you'll learn how platform signatures, privileged permissions, hidden APIs, and core applications like SystemUI, Settings, and Launcher work together to power Android. You'll also explore where system apps live in AOSP, how they are built, and how to create your own privileged system app from source.
Follow a single touch event through the entire Android operating system—from the Linux kernel and input drivers to the Android Framework, Zygote, Activity Manager, rendering pipeline, SurfaceFlinger, Hardware Composer (HWC), and finally the display. This end-to-end AOSP guide explains how Android transforms a simple screen tap into visible pixels while uncovering the architecture, IPC mechanisms, and system components that power every user interaction.