[AndyScherzinger]

Switches the launch screen to androidx.core:core-splashscreen, the same approach the Nextcloud Files app uses (LauncherActivity + Theme.App.Starting), but showing only the logo, without the Files app's optional branding text.

Before: the whole application used AppTheme.Launcher, whose window background was a layer-list (launch_screen.xml: primary color + ic_logo). MainActivity switched to AppTheme by hand. On Android 12+ the system splash screen (launcher icon) was dismissed as soon as MainActivity drew, so the empty toolbar layout of MainActivity showed until the users were loaded and the next screen opened.

After:

• MainActivity uses Theme.App.Starting (parent Theme.SplashScreen): primary background, ic_launcher_foreground as the icon (so the QA flavor keeps its own icon), postSplashScreenTheme = AppTheme.
• MainActivity.onCreate() calls installSplashScreen() before super.onCreate(), which also switches to AppTheme; the manual setTheme() is gone.
• setKeepOnScreenCondition keeps the splash screen until the intent has been routed (normal start and deep links, including error paths), so the empty MainActivity layout no longer flashes between the splash screen and the next screen. This is the one difference from the Files app, whose launcher layout is a plain primary-colored screen.
• The application theme is now AppTheme (main and gplay manifests); AppTheme.Launcher and launch_screen.xml are removed. All other activities already set their own theme.
• Same on all supported API levels: the compat library shows the splash screen below Android 12 too.

Second commit: MainActivity only routes and never shows content of its own, so its layout (activity_main.xml, an empty toolbar) is removed, together with ActionBarProvider, which only MainActivity implemented and nothing called. Behind the transition to the next screen only the window background is left, and starting skips inflating the toolbar. The one use of the layout was the snackbar for a phone book contact whose server has no matching account; it was shown underneath the conversation list that handleIntent() opens at the same time, so it is now a toast.

Checks: gplay and generic build; ktlint clean; lint unchanged against master (15 errors, 138 warnings, 7 hints); detekt only reports the existing CyclomaticComplexMethod on handleIntent (17/15, same on master). Verification metadata needed no update (AndroidX is covered by Google's key).

🖼️ Screenshots

🏚️ Before	🏡 After
B	A

🚧 TODO

• Test cold start on Android 12+ and on Android 8-11 (logged in and logged out)
• Test opening via notification, deep link (nextcloudtalk://), app shortcut and contact integration (incl. a contact of a server without account: toast)
• Run instrumented tests (MainActivityTest, LoginIT)
• Add before/after screenshots or screen recordings

🏁 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?)

🤖 AI (if applicable)

• The content of this PR was partly or fully generated using AI

[github-actions]

📱 QA build

Download	app-qa-debug.apk
QR code	Open the QR code for this download
Commit	9fef24e
Version	6937
Available until	7 days after this build

The QA build installs alongside a released Nextcloud app, so you can keep
using your existing install while testing.

Downloading the file requires a GitHub account, so open this link on the
device you want to test on, or transfer the APK to it.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	138	136
Errors	15	15

SpotBugs

Category	Base	New
Bad practice	7	7
Correctness	8	8
Dodgy code	40	40
Internationalization	3	3
Malicious code vulnerability	3	3
Performance	8	8
Security	11	11
Total	80	80