This details my projects and the features included within them.

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HeroSearch

Heroscape companion app used to search characters and create armies.

• Coroutines / Flow / StateFlow
  • Coroutines launched with exception handling by default
    • App does not fail on any coroutine failure
  • Flows launched with proper scope
    • Will cancel when either fragment or view model is stopped
    • Will continue past fragment or view model as needed
• Data handling
  • Data layer
    • Data mappers are used to transform remote data to domain data
  • View model layer
    • User input data is asynchronously validated before acceptance
      • Must be correct length, type (text, number, email), min-max (number), nullable
    • Local data is requested from Room database and transformed to adapter lists
    • Requests are asynchronously started via base UseCase class
      • Handles errors automatically
      • Posts on main thread, executes outside main thread
      • Takes scope to run only when needed
    • Results from requests are returned as Either left (failure) or right (success)
    • Failures organized by feature:
      • Database failures
      • Firebase failures
      • Firestore failures
      • Data validation failures
  • UI layer
    • User input data that is not valid will show errors and not allow submission
      • Errors are immediate and update with each user character entry
    • Contains base classes that share results handling code
      • Results can be ignored, shown to user, retried
    • ViewBinding is used to interact with layouts
• UI
  • Uses .xml to create UI
  • UI notifications
    • Shows snackbars to user on certain actions
    • Can show toasts to user
  • Text manipulation
    • Creates hyperlinks in text that user can click
    • Creates links in text that go to different part of app
    • Changes text size, bold, italicized, etc.
  • Animations
    • Uses animations to "scale up" search results from top to bottom
    • Fragment transitions use animations to slide in and out
    • Android material library used to show interactions with buttons
    • Xml animation lists are used to combine and animate individual xml vector files
    • Icons can change picture depending on current selection state
  • Colors
    • State lists are used to automatically change button/other colors upon state changes
    • Colors are applied to most views automatically through styles xml
  • Multiple unique vector icons created and converted to xml
  • Background shapes with colors created to improve aesthetics
  • FAB
    • Enhanced FAB button that expands to display more FAB options
  • Navigation drawer
    • Additionally uses Android navigation component for fragment navigation
  • Top app bar
    • Includes tab layout
    • Uses options menu in app bar
  • Popup menus used for different features
  • Dialog fragments are used for adding/editing data
  • Army creator
    • Users can select characters and add/remove them from personal army
    • Users can swipe through each character in the army
      • Bottom navigation can be used to view different parts of a specific character
  • Extensive SQLite search functionality
    • Created unique SQL "SELECT" search creator for enhanced user searches
    • User can search over 60 different fields
    • Searches can use the following operators:
      • contains - does not contain
      • equal to - not equal to
      • greater than - not greater than
      • less than - not less than
      • between - not between
    • Results can be sorted by multiple fields in alphabetical and reverse order
    • The results View layout can be changed between two different options
    • RecyclerView with paging data is used to handle results more efficiently
  • Character view
    • Four different bottom navigation tabs are used to display a character
    • A picture tab is used to display a picture of the character card
      • The card can be stored locally or is fetched from url using Glide
      • Url fetched images are cached
      • Users can change the default picture type they want displayed
    • A random dice roll is displayed via a bottom sheet dialog fragment
      • Allows D6 and D20 dice rolls
      • The specific character values are used for dice quantities, but can be adjusted
      • Dice rolls are saved and can be reset
• Storage
  • Local storage
    • Preference manager
      • Saves and edits user preferences
      • Uses kotlin serialization to store personal user SQL search text
    • Room database / SQLite
      • Multiple data classes contain unique and foreign key constraints
      • Embedded classes include one to one, one to many, many to one, many to many relations
      • Uses pre-populated data shipped with app
      • Automatically transfers user data to new database on app updates without data loss
      • Contains 26 primary classes used to store data
      • Users can create, edit, delete many different classes that are used to create character
  • Remote storage - Firebase Firestore
    • Requests remote data and updates app data
• Network handling
  • Checks for network availability
• Layout
  • Files organized by features
  • Features split files into data, domain, and presentation layers
  • Data layer contains model, repository, and source packages
  • Domain layer contains model, repository, useCase, and util packages
  • Presentation layer contains packages for different navigation/fragment elements
• Testing
  • Uses Dagger-Hilt for dependency injection, to better test classes
  • Uses Timber to log and debug information
  • Includes instrumentation DAO tests for Room database
  • Contains various unit tests for app logic
• Gradle
  • Includes debug and release builds
  • Imports release build signing config passwords
    • Allows passwords to be stored in separate file, not included in version control
  • Exports database schema for version control and database updates

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ExampleAndroidFeatures

• Broadcast Receivers
  • Airplane mode
  • Battery level
• Content Providers
  • User contacts
• Intents
  • Explicit Activity starting
  • Implicit select and show image
  • Implicit send email
• Services
  • Start and stop service
  • Send data

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LearnKotlin

Shows examples of and explains different features of the Kotlin programming language

• Access modifiers
  • internal, private, protected, public
• Callbacks
  • synchronous
  • asynchronous with anonymous class
  • asynchronous with closure
• Class types
  • abstract, data, enum
  • inheritance
    • delegation, composition, downcasting, inheritance, polymorphism, upcasting
  • interface (not a class)
• Constructors
  • init, secondary constructor
  • command line, default, fixed, mutable, named, non-accessible, and vararg arguments
  • overloading
• Containers
  • arrays
  • destructuring declarations
  • lists, mutableLists
    • add, all, any, chunked, compareBy, count, distinct, drop, dropLast, dropWhile,
    • filter, filterIndexed, filterNot, filterNotNull, find, flatMap, flatten, fold,
    • forEach, getOrNull, joinToString, map, mapIndexed, minByOrNull, none, partition,
    • reduce, reversed, slice, sorted, sortedBy, sortedByDescending, sortWith, sum,
    • take, takeLast, takeLastWhile, zip, zipWithNext
  • maps
    • entries, filterKeys, filterValues, get, getOrDefault, getOrElse, getOrPut,
    • getValue, keys, map, mapKeys, mapValues, values, withDefault
  • sets
    • intersect, setOf, subtract, union
• Coroutines
  • exception handler
    • uncaught exceptions propagate
    • caught exceptions
    • cancelled coroutines
    • coroutine suspension
  • flow
    • collecting flows, collecting and consuming channels
    • mapping flows, changing flow context
    • bad and good error handling
  • recursive functions
  • sharedFlow
  • stateFlow
• Data types
  • Byte, Short, Int, Long, Float, Double, Boolean, Char, String
  • extension properties
  • generic types, nullables, strings
• Expressions
  • if / else, in, repeat, when
• Functions
  • scope functions: also, apply, let, run, with
  • anonymous/lambda, extension, generic, parameter, recursion, returned, and variable functions
• Loops
  • break / continue, do while, for, labels, while
• Operators
  • assignment
    • +=, -=, *=, /=, %=
    • ++, --
  • logical
    • ==, !=, <, >, <=, >=, &&, ||
  • mathematical
    • +, -, *, /, %
  • null safety
    • !!, ?., ?:
  • end of declaration: ;, range: .., type declaration: :, label: @,
  • lambda / when: ->, parameter substitution: _, reference: ::
• Property accessors: get / set
• Sequences
  • eager vs lazy evaluation
  • generating sequences
  • intermediate vs terminal operations
• Serializable / JSON parsing
• Statements: for