[Feature Request] Preserve initial value of StateFlow / SharedFlow in FlowLiveData::asLiveData [157380488]

Fixed

Feature Request

androidx-ui-starter-projects

Status Update

No update yet.

Description

zi...@gmail.com

created issue #1

May 25, 2020 09:23PM

Component used: lifecycle-livedata-ktx
Version used: 2.3.0-alpha03

StateFlow and (as of now, not yet released) SharedFlow contain initial values. Those are not set on the LiveData created by the asLiveData extension methods on Flow in FlowLiveData.kt. It would be nice if the initial value was available as value on the created LiveData to help reduce unnecessary UI updates that happen when the values arrive on the Flow after the lifecycle method responsible for creating the initial view has already finished.

Here is a failing test for StateFlow that should work, IMHO:

@Test
fun asLiveData_should_preserve_initial_value_of_StateFlow() {
    val result = MutableStateFlow("init")
        .asLiveData()
        .value
    Truth.assertThat(result).isNotNull()
}

Comments

il...@google.com <il...@google.com> Nov 18, 2021 10:12PM

Status: New

sa...@google.com <sa...@google.com> Aug 18, 2022 11:21PM

Assigned to sa...@google.com.

ap...@google.com <ap...@google.com> #2Aug 23, 2022 12:44AM

Marked as fixed.

We have got to get a better way to handle deprecations. This is awful.

il...@google.com <il...@google.com> #3Aug 23, 2022 05:42PM

Project: platform/frameworks/support
Branch: androidx-main

commit 387ce59c6290b334c790f270d98f1b1dde5d3391
Author: Alan Viverette <alanv@google.com>
Date: Wed Nov 29 11:26:23 2023

Clean up obsolete compat methods in ViewCompat and usages in core

Doesn't update lint baseline yet because there are lots of unrelated
changes there. We'll handle the baseline after we clean up the rest of
core.

Doesn't update usages outside of core or core-ktx. These should be
handled by individual library owners.

Bug: 313834577
Test: ViewCompatTest
Relnote: Deprecated obsolete compat methods in ViewCompat
Change-Id: I0bfc2cd15dc681ba0c09f795d25622f2ade004d6

M core/core-ktx/src/main/java/androidx/core/view/View.kt
M core/core/api/current.txt
M core/core/api/restricted_current.txt
M core/core/src/main/java/androidx/core/view/ViewCompat.java
M development/build_log_simplifier/messages.ignore

https://android-review.googlesource.com/2852865

na...@google.com <na...@google.com> #4Sep 12, 2022 05:52PM

Holding off until Sergey is done to avoid conflicts. He's way ahead of me on minSdk cleanup.

Issue 157380488