Move Toast invocations out of Camera/VideoEdit ViewModels. #39
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donovanfm
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app/src/main/java/com/google/android/samples/socialite/ui/videoedit/VideoEditScreenViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/videoedit/VideoEditScreenViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/camera/CameraViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/camera/Camera.kt
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app/src/main/java/com/google/android/samples/socialite/ui/camera/CameraViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/videoedit/VideoEditScreen.kt
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app/src/main/java/com/google/android/samples/socialite/ui/videoedit/VideoEditScreenViewModel.kt
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One more thing, the PR comment could be "Closes #19", this will close that issue automatically after this PR gets merged. |
app/src/main/java/com/google/android/samples/socialite/ui/camera/CameraViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/camera/CameraViewModel.kt
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app/src/main/java/com/google/android/samples/socialite/ui/videoedit/VideoEditScreenViewModel.kt
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LGTM except what @Goooler pointed out. |
| LaunchedEffect(lifecycleOwner, context) { | ||
| viewModel.videoSaveState.collect { state -> | ||
| when (state) { | ||
| VideoSaveState.VIDEO_SAVE_SUCCESS -> | ||
| Toast.makeText(context, "Edited video saved", Toast.LENGTH_LONG).show() | ||
| VideoSaveState.VIDEO_SAVE_FAIL -> | ||
| Toast.makeText(context, "Error applying edits on video", Toast.LENGTH_LONG) | ||
| .show() | ||
| VideoSaveState.PENDING -> Unit | ||
| } | ||
| } | ||
| } |
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Should add viewModel.markMessageShown() to avoid showing toast twice, for example: onStop and onStart again
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@hoc081098
I think it's better to change to the existing collectAsStateWithLifecycle
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@yongsuk44 nice, but LifecycleResumeEffect is more suitable for flow collection 🙏
val scope = rememberCoroutineScope()
LifecycleResumeEffect(scope, viewModel) {
// ON_RESUME code is executed here
val job = viewModel.videoSaveState
.onEach{ /*handler*/}
.launchIn(scope)
onPauseOrDispose {
// do any needed clean up here
job.cancel()
}
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@hoc081098
Thanks for the feedback, I have question.
Considering the link I provided, collectAsStateWithLifecycle is designed to simplify the task of activating Flow collection when the app is in the foreground, making it easier for developers to manage state. So, why use LifecycleResumeEffect?
Why are you hoisting the state in the ViewModel and then bringing state change events back to the Composable? It seems to go against the Unidirectional Data Flow (UDF) design pattern.
I thought it was fetching state change events, I must have seen it wrong.
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@yongsuk44
collectAsStateWithLifecycle() = produceState() + repeatOnLifecycle() + flow.collect{}.
👉 we only collect the flow 👍, we don't need a returned Compose State<T>, don't need the recomposition of the @Composable.
✅ LifecycleResumeEffect is enough
Closes #19