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Android By Example

Reading/Writing Files

Android By Example

Introduction
Introduction
Week 1 (1/25-1/31)
Week 1 (1/25-1/31)
- Kotlin Primer
  Kotlin Primer
- Architecture
  Architecture
- Android Studio
  Android Studio
Week 2 (2/1-2/7)
Week 2 (2/1-2/7)
- Jetpack Compose Concepts
  Jetpack Compose Concepts
- Initial Movies UI
  Initial Movies UI
Week 3 (2/8-2/14)
Week 3 (2/8-2/14)
- Room
  Room
- Movies Database
  Movies Database
Week 4 (2/15-2/21)
Week 4 (2/15-2/21)
- Compose Lists
  Compose Lists
- Movies UI - Lists
  Movies UI - Lists
Week 5 (2/22-2/28)
Week 5 (2/22-2/28)
- Compose Text Fields
  Compose Text Fields
- Movies UI - Updates
  Movies UI - Updates
Week 6 (2/29-3/6)
Week 6 (2/29-3/6)
- Movies Widget
  Movies Widget
  - Widget Declaration
  - Widget UI and Data
- Speech
  Speech
Week 7 (3/7-3/13)
Week 7 (3/7-3/13)
- Google Map
  Google Map
- REST services
  REST services
  - Changes for REST
Week 8 (3/14-3/27)
Week 8 (3/14-3/27)
- Compose Graphics Part 1
  Compose Graphics Part 1
Week 9 (3/28-4/3)
Week 9 (3/28-4/3)
- Compose Graphics Part 2
  Compose Graphics Part 2
Week 10 (4/4-4/10)
Week 10 (4/4-4/10)
- Legacy Views
  Legacy Views
Week 11 (4/11-4/17)
Week 11 (4/11-4/17)
- Compose Layouts
  Compose Layouts
Week 12 (4/18-4/24)
Week 12 (4/18-4/24)
- Testing
  Testing
Week 13 (4/25-5/1)
Week 13 (4/25-5/1)
- Files
  Files
- Sensors
  Sensors
Week 14 (5/2-5/8)
Week 14 (5/2-5/8)
- NFC
  NFC
- Services
  Services
- Publishing
  Publishing

Reading/Writing Files

Introduction

Many programs need to save or load data to/from files. Android file I/O is similar to Java I/O (using the same APIs), but depending on where you want to save/load files, you may need to jump through a few hoops in the name of user privacy and protection.

In this module, we'll look at simple file I/O in private directories on a device or SD card, and more complex Storage-Access Framework file I/O.

Note: Due to out-of-town trips, I decided to edit a recording of a live lecture that I gave Summer 2021.

Videos

Total video time for this module: 1:59:57

Files: Lecture (Summer 2021) (27:29)

Files: Example 1 - Private Files (Summer 2021) (35:04)

Files: Example 2 - SD Card Private Files and MediaStore (Summer 2021) (35:52)

Files: Example 3 - Storage Access Framework (Summer 2021) (21:32)

Example Source

See: https://gitlab.com/605-686/fall-2023-refresh/modules/reading-writing-files