SuspendActivityResult: A Kotlin repository from sorianog

SuspendActivityResult

A lightweight library for requesting and consuming Activity Results using coroutines, it's usage is as simple as:

val uri = ActivityResultManager.getInstance().requestResult(
    contract = GetContent(),
    input = "image/*"
)

or using the built-in extensions:

val uri = ActivityResultManager.getInstance().getContent("image/*")

For more information, check the articles: Part 1 and Part 2

Runtime Permissions

The library offers a utility class for requesting runtime permissions with access to the shouldShowRequestPermissionRationale's value:

val result = PermissionManager.getInstance()
    .requestPermission(Manifest.permission.ACCESS_COARSE_LOCATION)
when (result) {
    PermissionGranted -> {
        // TODO
    }
    is PermissionDenied -> {
        if (result.shouldShowRationale) {
            // TODO
        } else {
            // TODO
        }
    }
}

This class uses internally ActivityResultManager.getInstance().requestPermission(), so everything below applies to it as well.

Download

implementation 'dev.hichamboushaba.suspendactivityresult:suspendactivityresult:0.1.3'

The default artifact uses App Startup for the initialization.

If you don't want this dependency added, you can use the other variant:

implementation 'dev.hichamboushaba.suspendactivityresult:suspendactivityresult-no-startup:0.1.3'

And initialize the library manually

class App : Application() {
    fun onCreate() {
        super.onCreate()
        ActivityResultManager.init(this)
    }
}

Testing

ActivityResultManager is an interface, so for better testability, it's recommended to inject ActivityResultManager.getInstance() into your components, for easier swapping to a fake or mocked implementation for tests.

Process-death

The implementation of requestResult takes into account process-death scenarios, and keeps track of the pending operation using the Activity's SavedStateRegistry , which means calling requestResult after a process-death, will not re-launch the activity result caller, and instead, it will only register the callback to allow receiving the result. And to make this work as expected, the application need to keep the screen's state across this process-death, to call requestResult afterwards, check the example app for how we can implement this using SavedStateHandle .

sorianog/SuspendActivityResult