Refactor Account Settings Screen - Implement LifeCycleOwner for PreferenceFragment

[SowmiaS]

Part of #12372

Description

The Third PR for the task of refactoring the AccountSettingsFragment to MVVM following the reactive approach using Flow. This PR implements the LifeCycleOwner for PreferenceFragment.

Why

Since android.preference.PreferenceFragment doesn't have support to observe Flows and LiveData. Implementing reactive approach seems impossible.

Possible Solutions

1. App has to be migrated to Androidx Preference Library.
2. Implement LifeCycleOwner interface to support observing Flows and LiveData.

Reason for choosing Approach 2 - Implement LifeCycleOwner interface

Approach-1 (migrating to Androidx preference library) requires code changes in all Preference related classes. This can be done as a separate task.
So I have created a separate class, which implements LifeCycleOwner interface to support observing Flows and LiveData.

Note: This is just a temporary solution. Once the app is migrated to Androidx Preference Library, this class can be deleted.

Regression Notes

No Potential impact on screens as the implementation is not consumed by AccountSetingsFragment.

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[ashiagr]

@SowmiaS 👋

Can you merge latest trunk to this PR branch? Ping me once it is done so that I can start reviewing it.

Thank you!

[SowmiaS]

@ashiagr Sorry for the delay. The PR is ready for review now.
Thanks 🙂

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[AjeshRPai]

@SowmiaS I have looked at the PreferenceFragmentLifeCycleOwner. Code wise it looks fine to me 👍🏼 . As there aren't user-facing changes, I look forward to the next PR to see how AccountSettingsFragment will use this class. Thanks for working on this. I have initiated the CI to run on this PR. I will merge the PR after the CI completes successfully. 👍🏼

[SowmiaS]

@AjeshRPai Thank you for taking your time to review this PR. 🙌

[AliSoftware]

Thanks again for this PR @SowmiaS 🎉

For information, your fix has been included in the version 20.2-rc-1 that we are now sending to beta-testing phase before releasing it to the public in two weeks. Be sure to watch https://make.wordpress.org/mobile/ for a soon-to-be published post about the beta-testing of WPAndroid 20.2, to help us test this version and your fix that shipped in it!