| Qualified | Competent | Expert |
|---|---|---|
| Activity, fragment, view group, view | Material design principles; material design implementation in support library; draw canvas, layout inflater, measuring view tree | Remote views; view tree observer; rendering optimization |
| Layouts | ||
| Linear Layout, Frame Layout, Relative Layout | Constraint Layout, Coordinator Layout, Pull-to-refresh, Drawer | |
| Styles and Themization | ||
| Android themes; day-night theme; status bar themization; text appearance; difference between style and theme attributes | ||
| Animations | ||
| Custom and system animations; object animator, property animation; animation resources; animation set and complex animations; animating constrains; vector animations; animate layout changes; recycler view animations; animate view | Optimization animation; complex vector animation; executing animations on render thread; application and fragment transition with shared element | |
| Cuctom Chrome Tabs | ||
| Using web view vs Chrome Tabs | Chrome tabs customization; using KeepAlive service; cutom controls | flow architecture to intercept results |
| Notifications | ||
| Notification Manager, Notification Builder, Notification Parameters | Using Pending Intents in notifications; using resources for notifications | Notifications in Oreo, channels; Push Notifications; Urbanairship, Pushwoosh; Using console to test notification |
| Remote Views | ||
| Application Widget and Pin | Lock guard themization, using remore views for Custom Chrome tabs | |
| Other | ||
| Resource types | Localization; Vector Drawables, Animated Vector Drawables, importing resources | External Resources; using tools to mock resources for tests |
| Qualified | Competent | Expert |
|---|---|---|
| SQLite, Database helper, Shared Preference Manager | Realm, Firebase Storage; Content resolver and Content provider, Room database; | Data synchronization, backup, restoring device, changing device |
| Qualified | Competent | Expert |
|---|---|---|
| Java | ||
| Primitive types; loop and branch syntax, blocks, local variables; operation and operand order; scopes; packages, wildcard import, static import; inheritance; method signature; incapsulation; class, abstract class, enum, interface, annotation; Serializable interface; final keyword; immutable pattern; String and datetime basic operations; Checked and unchecked Exceptions; try-catch syntax; java-beans, POJO; singleton, setters, getters, builders | Collections; Atomic types; Concurrency programming: synchronization, threads, executors, futures, thread safe collections, fork-jon framework; generics; Arrays and Objects utility classes; reflexions; Annotations and preprocessors; auto-closeable try catch; work with filesystem NIO2; lambdas, functional interfaces, default method; locales, formatting and internationalization; creating own annotations | Streams; javax; guava; data structures; sorting algorythms; big data optimization; math extensions; parallel programming; blockchains; matrix computations; O-complexity of basic algorythms; grpc (.protobuff), gson |
| Kotlin | ||
| Scopes, val and var keywords, NPE safe; migration java class to Kotlin | Extensions, coroutines, companion objects |
| Qualified | Competent | Expert |
|---|---|---|
| HttpURLConnection, OkHttp, basic REST | Socket.IO, MQTT, XMPP (Jabber), TLS; RetroFit, Volley; Download manager; handling network changes | Certificate pinning, SSLSocketFactory interception; Samsung Smart switch |
| Qualified | Competent | Expert |
|---|---|---|
| App Fundamentals | ||
| Manifest; App Components; system services available from context | User id, proces id, android id; AsynckTask, Loaders; Fragment Manager tree; Android specific classes: Sparse Array, Text Utils | Support Java 8 in Android limitations; |
| App Components | Lollipop, Marshmallow, Oreo specific work with components; themization and localization context | |
| Context: application context, services, activities, broadcast receivers; Context wrappers | ||
| Manifest | ||
| Manifest structure | ||
| Activities | ||
| Activity lifecycle, activity manager; starting activities, starting activities for result | Activity lifecycle callbacks; task, activity, affinity; shared element; launch modes; start activity flags; saving state | Persistable activity; starting foreign activity; activity and multi-process |
| Fragments | ||
| Fragment Manager, Child Fragment Manager; Fragment Lifecycle | ||
| Services | ||
| Start service, bind service; Service, IntentService, JobService | Services in Lollipop, Marshmallow and Oreo; starting service security issues; binding flags and types; starting foreground service | |
| Broadcast Receivers | ||
| Main purpose, sending broadcasts | Security issues sending broadcasts; Local Broadcast Manager | Sticky broadcasts |
| Content Providers | ||
| Main purpose for content providers; known system content providers; content resolver; system preferences | Creating content provider; database helper, migration, contract, urls | |
| Intercomponent communication | ||
| Intents, intent filters, actions, categories | Binder, aidl files; Parcellable vs Object stream (Serializable); marshalling data using Parcel; using content providers; exported activities and services; running intent as user; resolving permission for contacts; activity picker, contact picker, account picker; Deeplinks | Using power locks, secure communication, activity manager flow switching activities; App Indexing; App Links |
| Qualified | Competent | Expert |
|---|---|---|
| Instrumentation Tests, Espresso, UIAuthomator; unittest and android test; popular test runners; mocks and stubs | PowerMock, Mockito, Multidex runner, Roboelectric; Mocking context; Creating Rules |
| Qualified | Competent | Expert |
|---|---|---|
| Build environment | ||
| Android Studio, Eclipse; adding classes, resources; navigation panels | Gradle, cmake; repositories, artifacts; instant run optimization; libraries, modules; maven project; signing keystores; .jar, .aar, .so, .dex, .class; aapt2, shrinking resources; build vatiants, flavors | Groovy, gradle tasks; errorprone; compile preprocessors; gragle plugins: android, firebase, kotlin; Lombok |
| Java Machine in Android | ||
| Java machine environment; UI and background threads | JNI, embedding C++ libraries; render thread; zygote, process; multidex, D8 | Kernel versions; using kernel libraries; using HAL to launch own system implementation; Class loader tree |
| Qualified | Competent | Expert |
|---|---|---|
| Permitions, permition levels, groups; file system permitions; runtime permitions | Account Management; User Management; Lock types; Lock Guard; Confirm Credentials; Fingerprint Manager; resolving runtime permitions; share permitions for external activities; fileholder permitions; Keychain | Android Keystore (version related difference, hardware backed); Trust Zone: DEK, KEK; Safety Net; available security algorythms depending on version; DRM; system permissions; Kiosk mode; boot aware mode; root permissions; device administrator |
| Qualified | Competent | Expert |
|---|---|---|
| Memory management | ||
| handling memory callbacks; memory alocation; retain release; drawing canvas | increase memory limits; caching strategies; LRU collections; ashmem; heap | Garbage collector; row hammer attack; uisng leak canary |
| Profiling App | ||
| ADB integration, monitoring memory | Memory dumps | |
| Battery Management | ||
| Power optimization best practices | Dump battery stats |
| Qualified | Competent | Expert |
|---|---|---|
| MVC, MVP, MVVM, SOLID, Clean Architecture, KISS; | TDD, DDD; GOF Patterns |
| Qualified | Competent | Expert |
|---|---|---|
| RxJava | ||
| Reactive programming concepts; using lambdas; subscribers, observers | Difference RxJava 1 and 2; transformers; rx functional interfaces; publishers and thread safe; schedulers | Mocking RxJava schedulers |
| Qualified | Competent | Expert |
|---|---|---|
| Camera and Gallery; Location Manager; Sensor Manager; BlueTooth manager | Android TV, Smart watches, Google glass |
| Qualified | Competent | Expert |
|---|---|---|
| Data Binding Library | ||
| MVVM concept; data binding inflator; bindings; observable fields | binding adaptors | |
| Support Library | ||
| AppCompatActivity, AppCompat… components | ContextCompat utility class; Material design with Support Library | |
| Play Services | ||
| Basic components of play services; Google maps | ||
| Continuous Integration | ||
| basic principles; Google Test Lab | Jenkins, Fabric, Crashlytics, Leak Canary; deploying apps onto play market | Bitrise, Fastline; gradle signing task |
| Source control | ||
| Git, git-flow; branches, repositories, commits | git hooks; Gerrit, gitlab; managing git history; garbage collection; merging strategies; integration git and Android Studio | |
| Project Management | ||
| Basic knowledge of JIRA; tickets, stories, estimations, estimation strategies, time reporting, kanban | ||
| Dependency Injection | ||
| dependency injection principles; DDD concept; basic annotations | Dagger Android; Dagger 1 and 2 difference; Object graph; Scopes, components, subcomponents |
| Qualified | Competent | Expert |
|---|---|---|
| Android Platform Architecture | ||
| Dalvik, ART; Android framework; System apps | IPC; Kernel, drivers, Binder, HAL, Android framework | Trust Zone, Trusty; Andoid without framework; AOSP |
| Instant App | ||
| Feature modules, instant app limits | Dynamic links |