Android development with Kotlin: learn Android application development with the extensive features of Kotlin

Cover......Page 1
Copyrights......Page 3
Credits......Page 4
About the Authors......Page 5
About the Reviewers......Page 7
www.PacktPub.com......Page 8
Customer Feedback......Page 9
Table of Contents......Page 10
Preface......Page 16
Chapter 1: Beginning Your Kotlin Adventure......Page 22
 Say hello to Kotlin......Page 23
 Awesome Kotlin examples......Page 25
  Kotlin Playground......Page 31
   Configuring Kotlin for the project......Page 33
   Using Kotlin in a new Android project......Page 36
   Java to Kotlin converter (J2K)......Page 38
   Alternative ways to run Kotlin code......Page 39
 Kotlin under the hood......Page 40
 More reasons to use Kotlin......Page 41
 Summary......Page 43
Chapter 2: Laying a Foundation......Page 44
 Variables......Page 45
 Type inference......Page 47
 Strict null safety......Page 51
  Safe call......Page 54
  Elvis operator......Page 55
  Not-null assertion......Page 56
  The let function......Page 57
 Nullability and Java......Page 58
  Safe/unsafe cast operator......Page 60
  Smart casts......Page 62
   Type smart casts......Page 63
   Non-nullable smart cast......Page 65
 Primitive data types......Page 66
  Numbers......Page 67
  Char......Page 69
  Arrays......Page 70
  The Boolean type......Page 71
   String templates......Page 72
  Ranges......Page 73
 Statements versus expressions......Page 75
 Control flow......Page 76
  The if statement......Page 77
  The when expression......Page 78
   The for loop......Page 82
   The while loop......Page 83
   Break and continue......Page 84
 Exceptions......Page 88
  The try... catch block......Page 90
 Compile-time constants......Page 91
 Delegates......Page 92
 Summary......Page 93
Chapter 3: Playing with Functions......Page 94
 Basic function declaration and usage......Page 95
  Parameters......Page 96
  Returning functions......Page 98
 Vararg parameter......Page 100
 Single-expression functions......Page 101
 Tail-recursive functions......Page 104
  Default argument values......Page 106
  Named arguments syntax......Page 107
 Top-level functions......Page 108
 Top-level functions under the hood......Page 110
 Local functions......Page 112
 Nothing return type......Page 114
 Summary......Page 116
Chapter 4: Classes and Objects......Page 117
 Properties......Page 118
  Read-write versus read-only......Page 122
  Property access syntax between Kotlin and Java......Page 123
   Increment and decrement operators......Page 124
  Custom getters/setters......Page 127
   The getter versus property default value......Page 129
  Late-initialized properties......Page 130
  Annotating properties......Page 131
  Inline properties......Page 132
 Constructors......Page 133
  Properties versus constructor parameters......Page 135
   Patterns......Page 136
 Inheritance......Page 137
  The JvmOverloads annotation......Page 141
 Interfaces......Page 142
 Data classes......Page 146
  The equals and hashCode methods......Page 147
  The toString method......Page 149
  The copy method......Page 150
  Destructing declarations......Page 151
 Operator overloading......Page 153
 Object declaration......Page 156
 Object expression......Page 158
 Companion objects......Page 161
  Companion object instantiation......Page 163
 Enum classes......Page 166
 Infix calls for named methods......Page 169
 Visibility modifiers......Page 173
  The internal modifier and Java bytecode......Page 176
 Sealed classes......Page 178
 Nested classes......Page 180
 Import aliases......Page 181
 Summary......Page 183
Chapter 5: Functions as First-Class Citizens......Page 184
 Function types......Page 185
  What is function type under the hood?......Page 186
 Anonymous functions......Page 187
 Lambda expressions......Page 189
  The implicit name of a single parameter......Page 192
 Higher-order functions......Page 193
  Providing operations to functions......Page 195
  A callback after a threaded operation......Page 196
 Combination of named arguments and lambda expressions......Page 197
 The last lambda in an argument convention......Page 198
  Named code surrounding......Page 200
 Java SAM support in Kotlin......Page 202
  Named parameters in function types......Page 205
  Type alias......Page 206
 Underscore for unused variables......Page 209
 Destructuring in lambda expressions......Page 210
 Inline functions......Page 212
  The noinline modifier......Page 215
  Non-local returns......Page 216
  Labeled returns in lambda expressions......Page 219
  Crossinline modifier......Page 222
  Inline properties......Page 224
 Function references......Page 225
 Summary......Page 228
Chapter 6: Generics Are Your Friends......Page 229
  The need for generics......Page 230
   Type parameters versus type arguments......Page 231
 Generic constraints......Page 232
  Nullability......Page 233
 Variance......Page 235
  Variance modifiers......Page 237
  Use-site variance versus declaration-site variance......Page 239
  Collection variance......Page 240
  Variance producer/consumer limitation......Page 243
 Type erasure......Page 245
  Reified type parameters......Page 247
 Star-projections......Page 249
 Type parameter naming convention......Page 251
 Summary......Page 252
Chapter 7: Extension Functions and Properties......Page 253
 Extension functions......Page 254
  Extension functions under the hood......Page 256
   No method overriding......Page 257
   Access to receiver elements......Page 258
  Companion object extensions......Page 259
  Operator overloading using extension functions......Page 260
  Where should top-level extension functions be used?......Page 261
 Extension properties......Page 262
  Where should extension properties be used?......Page 264
 Member extension functions and properties......Page 266
  Types of receivers......Page 269
  Member extension functions and properties under the hood......Page 271
 Generic extension functions......Page 272
  Collection processing......Page 274
   The Kotlin collection type hierarchy......Page 276
   The map, filter, and flatMap functions......Page 280
   The withIndex and indexed variants......Page 282
   The sum, count, min, max, and sorted functions......Page 283
   Examples of stream collection processing......Page 287
   Sequence......Page 290
 Function literals with a receiver......Page 292
  Kotlin standard library functions......Page 293
   The let function......Page 295
   The also function......Page 297
   The run and with functions......Page 298
  Domain-specific language......Page 300
   Anko......Page 307
 Summary......Page 308
Chapter 8: Delegates......Page 309
  The Delegation pattern......Page 310
  Decorator pattern......Page 316
  What are delegated properties?......Page 319
   The lazy function......Page 322
   The notNull function......Page 328
   The observable delegate......Page 330
   The vetoable delegate......Page 332
   Property delegation to the Map type......Page 334
  Custom delegates......Page 337
   View binging......Page 340
   Preference binding......Page 342
   Providing a delegate......Page 346
 Summary......Page 348
Chapter 9: Making Your Marvel Gallery Application......Page 349
 Marvel Gallery......Page 350
  How to use this chapter......Page 351
  Making an empty project......Page 354
  Character gallery......Page 358
   View implementation......Page 359
   Network definition......Page 372
   Business logic implementation......Page 381
   Putting it all together......Page 397
  Character search......Page 400
  Character profile display......Page 412
 Summary......Page 429
Index......Page 430