Feat: Schedule messages

[sowjanyakch]

Resolve #5634

• Schedule messages with a long click on the send button.
• Able to edit, reschedule, delete, send now scheduled messages from long press menu of the scheduled message.
• Complete composable scheduled messages view and use native emoji picker.

🚧 TODO

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not needed
• 🔖 Capability is checked or not needed
• 🔙 Backport requests are created or not needed: /backport to stable-xx.x
• 📅 Milestone is set
• 🌸 PR title is meaningful (if it should be in the changelog: is it meaningful to users?)

[mahibi]

open a chat
see that there is an endless loop:

2026-01-21 10:33:45.652 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  <-- 200 https://xxxxxxxx.com/ocs/v2.php/apps/spreed/api/v1/chat/5845852403/schedule (175ms)
2026-01-21 10:33:45.653 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  server: nginx
2026-01-21 10:33:45.654 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  date: Wed, 21 Jan 2026 09:33:44 GMT
2026-01-21 10:33:45.654 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  content-type: application/json; charset=utf-8
2026-01-21 10:33:45.654 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-request-id: FJhH4va9pyZQNmF5fBhT
2026-01-21 10:33:45.654 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  cache-control: no-cache, no-store, must-revalidate
2026-01-21 10:33:45.654 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  content-security-policy: default-src 'none';base-uri 'none';manifest-src 'self';frame-ancestors 'none'
2026-01-21 10:33:45.655 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  feature-policy: autoplay 'none';camera 'none';fullscreen 'none';geolocation 'none';microphone 'none';payment 'none'
2026-01-21 10:33:45.655 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-robots-tag: noindex, nofollow
2026-01-21 10:33:45.655 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-user-id: marcel2
2026-01-21 10:33:45.655 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  strict-transport-security: max-age=15768000; includeSubDomains; preload
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  referrer-policy: no-referrer
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-content-type-options: nosniff
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-frame-options: SAMEORIGIN
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-permitted-cross-domain-policies: none
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-robots-tag: noindex, nofollow
2026-01-21 10:33:45.656 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  x-xss-protection: 1; mode=block
2026-01-21 10:33:45.658 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  {"ocs":{"meta":{"status":"ok","statuscode":200,"message":"OK"},"data":[]}}
2026-01-21 10:33:45.659 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  <-- END HTTP (74-byte body)
2026-01-21 10:33:45.699 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  --> GET https://xxxxxxxx.com/ocs/v2.php/apps/spreed/api/v1/chat/5845852403/schedule
2026-01-21 10:33:45.699 32164-4051  okhttp.OkHttpClient     com.nextcloud.talk2                  I  Authorization: ██

This screen definitely needs a description in the header. At least "Scheduled messages" as first header and "In [conversationame]" as seconds header.

please align the icon with web (use the clock icon, not calendar):

the component for the ripple effect should be extended, it's quite small?
Also it would be better to keep it marked. This would make it more clear that the usr has to click on "Schedule message" afterwards. At first i was confused that clicking a time did not close the dialog and apply the selection.

The scheduled messages should be ordered by date and time. And also show the date, not only the time.

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/5690.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	99	103
Errors	0	0

SpotBugs

Category	Base	New
Bad practice	6	6
Correctness	10	10
Dodgy code	54	54
Internationalization	3	3
Malicious code vulnerability	3	3
Performance	4	4
Security	1	1
Total	81	81

Lint increased!