Kotlin for Android Developers
Application Singleton and Delegated Properties
tải về 1.04 Mb. Chế độ xem pdf
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- Điều hướng trang này:
- 17 Creating an SQLiteOpenHelper
- 18 Collections and functional operations
- 19 Saving and requesting data from database
| 16 Application Singleton and Delegated Properties . . . . . . . . . . . . . . . . . . . . . . 56
16.1 Application Singleton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56 16.2 Delegated Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57 16.3 Standard Delegates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58 16.4 How to create a custom delegate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 16.5 Reimplementing App Singleton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62 CONTENTS 17 Creating an SQLiteOpenHelper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 17.1 ManagedSqliteOpenHelper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 17.2 Tables definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 17.3 Implementing SqliteOpenHelper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 17.4 Dependency injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 18 Collections and functional operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 18.1 Aggregate operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71 18.2 Filtering operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 18.3 Mapping operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 18.4 Elements operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76 18.5 Generation operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78 18.6 Ordering operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 19 Saving and requesting data from database . . . . . . . . . . . . . . . . . . . . . . . . . 81 19.1 Creating database model classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 19.2 Writing and requesting data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 tải về 1.04 Mb. Chia sẻ với bạn bè của bạn:
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