count_down_example

An Android example App that simulates "get SMS OTP" flow:

• click the "get SMS OTP" button
• disable the button and show progressbar while waiting for response
• count down from 10 to 0
• the button can be clicked again

Dev env

• macOS 11.6 (Big Sur) x64
• Android Studio Bumblebee Patch 1
• Android SDK version 31
• JDK: 11
• Gradle: 7.2
• Kotlin: 1.6.10
• RxJava: 3.1.3

References

• RxJava2系列实践之倒计时功能(三)
• Day 7 ViewModel (Last) 應用與心得總結
• View Binding
• How to create a countdown with flow coroutines
• LiveData Overview
• CountDownTimer
• RxJava2 and LiveData
• Sealed interfaces in Kotlin
• Kotlin flows on Android
• StateFlow and SharedFlow
• Class BehaviorSubject

Libraries

• rxjava
• rxandroid
• kotlinx-coroutines-android
• lifecycle-runtime-ktx
• lifecycle-viewmodel-ktx

Todos

• update UI by Compose State.