Android Programming Cheat Sheet

Updated 2026-04-28

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Android app development is the practice of building lifecycle-driven software that runs on the Android platform, primarily using Kotlin with the Android SDK + AndroidX (Jetpack). Jetpack Compose is the recommended modern UI toolkit, backed by a declarative state model and a rich ecosystem spanning navigation, animations, adaptive layouts, and on-device AI. Production complexity arises from coordinating UI state with asynchronous work (network, storage, background execution) while respecting component lifecycles and modern platform restrictions. A useful mental model: the system owns your process and components, and your app reacts to callbacks, intents, and state flows rather than controlling a linear main loop.

What This Cheat Sheet Covers

This topic spans 18 focused tables and 192 indexed concepts, 164 flashcards. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.

Table 1: Tooling and Core SetupTable 2: Build, Packaging, and ReleaseTable 3: Core App Components and IPCTable 4: Jetpack Compose UI BasicsTable 5: Compose AnimationsTable 6: Views UI and NavigationTable 7: Architecture and State ManagementTable 8: Dependency Injection — HiltTable 9: Concurrency and Background WorkTable 10: Notifications and Push MessagingTable 11: Networking and ConnectivityTable 12: Storage and FilesTable 13: Adaptive Layouts and Large ScreensTable 14: Camera and LocationTable 15: Permissions, Identity, and SecurityTable 16: Testing, Debugging, and QualityTable 17: On-Device AI and ML KitTable 18: Performance and Delivery

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Table 1: Tooling and Core Setup

Everything you reach for before writing a line of app code lives here — the IDE, the Gradle wrapper that pins your build version, and the command-line tools (adb, sdkmanager, logcat) that talk to devices and emulators. Get these right early and the rest of the toolchain mostly stays out of your way.

Tool	Example	Description
Android Studio	`Tools > SDK Manager`	Primary IDE for Android development (code, build, run, debug, profile).
Gradle Wrapper	`./gradlew tasks`	Project-pinned Gradle launcher (`gradlew` / `gradlew.bat`) that downloads and uses the declared Gradle version.
Android Gradle Plugin (AGP)	`plugins { id("com.android.application") }`	Gradle plugin that adds Android build tasks — APK/AAB packaging, resources, and manifest merging.
Version catalogs	`libs.versions.toml` in `gradle/`	• Centralized dependency and version declarations in TOML • reduces duplication across modules.
Kotlin for Android	`class MainActivity : ComponentActivity()`	• Kotlin-first language for Android • official recommended language since 2019.
Android Debug Bridge (adb)	`adb devices`	CLI bridge to devices and emulators for install, shell, logs, and port forwarding.
SDK Manager (sdkmanager)	`sdkmanager --list`	Command-line SDK package manager for listing, installing, and updating Android SDK components.
logcat	`logcat -s MyTag:D *:S`	• CLI log viewer for system and app logs • pairs with `Log.*` calls.
Logcat window	`Logcat > Filter by package`	Android Studio UI for live device logs with package and severity filtering.
Emulator CLI	`emulator -avd Pixel_7_API_34`	Start or list AVDs from the command line for repeatable CI runs.

Table 2: Build, Packaging, and Release

Turning source into a shippable artifact is its own discipline in Android — you juggle SDK levels, build types and flavors, code shrinking with R8, and the signing keys that Play requires. These rows map the path from assembleDebug all the way to an App Bundle on the Play Store, plus the in-app update and review hooks you wire in afterward.

Build	Example	Description
Build variants	`./gradlew assembleDebug` `./gradlew assembleRelease`	Gradle-generated variants combining build types and product flavors.

The rest of this section is part of the full cheat sheet

Table 3: Core App Components and IPC

The building blocks the Android system actually knows about — activities, services, broadcasts, and content providers — along with the Intents and PendingIntents that glue them together. This is the layer where the platform owns your process and calls into your code, so understanding these lifecycles and messaging primitives is what separates apps that behave from apps that leak and crash.

Component	Example	Description
Activity lifecycle	`override fun onStart() { super.onStart() }`	Lifecycle callbacks (onCreate → onStart → onResume → onPause → onStop → onDestroy) that drive UI and resource management.

The rest of this section is part of the full cheat sheet

Table 4: Jetpack Compose UI Basics

Compose is the modern, declarative way to build Android UI: you describe what the screen should look like for the current state, and recomposition redraws only what changed. The essentials gathered here — state hoisting, lifecycle-aware Flow collection, side effects, modifiers, and lazy lists — are the vocabulary you'll use on nearly every screen.

Compose	Example	Description
Thinking in Compose	`@Composable fun Greeting(name: String) { Text(name) }`	• Declarative UI mental model — composables describe UI from current state • recomposition updates only what changed.

The rest of this section is part of the full cheat sheet

Table 1: Tooling and Core Setup

Tool	Example	Description
Android Studio	`Tools > SDK Manager`	Primary IDE for Android development (code, build, run, debug, profile).
Gradle Wrapper	`./gradlew tasks`	Project-pinned Gradle launcher (`gradlew` / `gradlew.bat`) that downloads and uses the declared Gradle version.
Android Gradle Plugin (AGP)	`plugins { id("com.android.application") }`	Gradle plugin that adds Android build tasks — APK/AAB packaging, resources, and manifest merging.
Version catalogs	`libs.versions.toml` in `gradle/`	• Centralized dependency and version declarations in TOML • reduces duplication across modules.
Kotlin for Android	`class MainActivity : ComponentActivity()`	• Kotlin-first language for Android • official recommended language since 2019.
Android Debug Bridge (adb)	`adb devices`	CLI bridge to devices and emulators for install, shell, logs, and port forwarding.
SDK Manager (sdkmanager)	`sdkmanager --list`	Command-line SDK package manager for listing, installing, and updating Android SDK components.
logcat	`logcat -s MyTag:D *:S`	• CLI log viewer for system and app logs • pairs with `Log.*` calls.
Logcat window	`Logcat > Filter by package`	Android Studio UI for live device logs with package and severity filtering.
Emulator CLI	`emulator -avd Pixel_7_API_34`	Start or list AVDs from the command line for repeatable CI runs.

Table 2: Build, Packaging, and Release

Build	Example	Description
Build variants	`./gradlew assembleDebug` `./gradlew assembleRelease`	Gradle-generated variants combining build types and product flavors.

Table 3: Core App Components and IPC

Component	Example	Description
Activity lifecycle	`override fun onStart() { super.onStart() }`	Lifecycle callbacks (onCreate → onStart → onResume → onPause → onStop → onDestroy) that drive UI and resource management.

Table 4: Jetpack Compose UI Basics

Compose	Example	Description
Thinking in Compose	`@Composable fun Greeting(name: String) { Text(name) }`	• Declarative UI mental model — composables describe UI from current state • recomposition updates only what changed.