R8 has broken release APKs here before by stripping the JNI-loaded player
and security classes, and the only way to reproduce that was to build with
the real signing key and clobber the install you actually use.
`./scripts/build-and-deploy.sh release --device --debug` now builds a
fully minified release APK — exactly what ships — into the .debug
applicationId slot, signed with the local debug keystore:
release com.dtourolle.jellytau 0.5.5
release --debug com.dtourolle.jellytau.debug 0.5.5-debug-release
debug com.dtourolle.jellytau.debug 0.5.5-debug
It shares the applicationId *and* the signature with the plain debug
build, so the two replace each other cleanly rather than colliding, and
the versionName suffix says which is currently installed. No real key is
needed, so the side-by-side path deliberately skips
write-keystore-properties.sh.
The flag reaches Gradle as JT_SIDE_BY_SIDE=1. CI never sets it, and the
release manifest merges byte-identical without it — verified both ways
through processUniversalReleaseMainManifest.
deploy-android.sh and build-and-deploy.sh learned the flag too, since the
APK path is unchanged but the package to launch is not.
Testing a debug build meant uninstalling the real one first: same
applicationId signed with a different key is INSTALL_FAILED_UPDATE_
INCOMPATIBLE, so every experiment cost the app's settings, credentials
and offline cache.
The debug build type now carries applicationIdSuffix ".debug" and
versionNameSuffix "-debug", so it installs as com.dtourolle.jellytau.debug
("JellyTau Debug", 0.5.5-debug) with its own data directory — two
independent apps on one device.
Only the *application* id is suffixed. Kotlin classes stay in the
`namespace` package com.dtourolle.jellytau, so the JNI loadClass lookups
in player/android/mod.rs, the manifest <service> entry and the R8 keep
rules are untouched, and the FileProvider authority was already
${applicationId}-relative. Launcher names come from the appLabel /
activityLabel manifestPlaceholders rather than resValue, which would
collide with Tauri's generated strings.xml; release resolves them back to
@string/app_name and merges byte-identical.
deploy-android.sh reports the target package and explains an
UPDATE_INCOMPATIBLE failure instead of leaving it raw; logcat.sh takes a
debug|release argument (it was filtering on com.jellytau.app, a package
that has never existed) and attaches by pid when the app is running.
Verified: aapt2 badging on the built APK reports
com.dtourolle.jellytau.debug / 0.5.5-debug / "JellyTau Debug", and the
release manifest merge is unchanged.