v0.6.0 causes AAB downloaded from Play Store crash

Start with the Android packaging settings in android/app/build.gradle.kts and the dependency changes in pubspec.yaml. Build a fresh AAB, check that arm64 output contains libflutter.so and the PDFium libraries, then validate delivery through Play preflight. Done means the Play-installed app starts without the missing-libflutter.so crash.

E/FlutterLoader( 1809): Flutter initialization failed.
E/FlutterLoader( 1809): java.util.concurrent.ExecutionException: iz5: Could not find 'libflutter.so'. Looked for: [arm64-v8a, armeabi-v7a, armeabi], but only found: [].
E/FlutterLoader( 1809): 	at java.util.concurrent.FutureTask.report(FutureTask.java:124)
E/FlutterLoader( 1809): 	at java.util.concurrent.FutureTask.get(FutureTask.java:193)
E/FlutterLoader( 1809): 	at ke3.a(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:41)
E/FlutterLoader( 1809): 	at ld3.<init>(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:410)
E/FlutterLoader( 1809): 	at ld3.<init>(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:542)
E/FlutterLoader( 1809): 	at q10.i(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:26)
E/FlutterLoader( 1809): 	at e10.onCreate(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:1)
E/FlutterLoader( 1809): 	at com.example.app.MainActivity.onCreate(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:1)
E/FlutterLoader( 1809): 	at android.app.Activity.performCreate(Activity.java:9758)
E/FlutterLoader( 1809): 	at android.app.Activity.performCreate(Activity.java:9727)
E/FlutterLoader( 1809): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1544)
E/FlutterLoader( 1809): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:5024)
E/FlutterLoader( 1809): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:5290)
E/FlutterLoader( 1809): 	at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:224)
E/FlutterLoader( 1809): 	at android.app.servertransaction.TransactionExecutor.executeNonLifecycleItem(TransactionExecutor.java:133)
E/FlutterLoader( 1809): 	at android.app.servertransaction.TransactionExecutor.executeTransactionItems(TransactionExecutor.java:103)
E/FlutterLoader( 1809): 	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:80)
E/FlutterLoader( 1809): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:3287)
E/FlutterLoader( 1809): 	at android.os.Handler.dispatchMessage(Handler.java:132)
E/FlutterLoader( 1809): 	at android.os.Looper.dispatchMessage(Looper.java:358)
E/FlutterLoader( 1809): 	at android.os.Looper.loopOnce(Looper.java:288)
E/FlutterLoader( 1809): 	at android.os.Looper.loop(Looper.java:392)
E/FlutterLoader( 1809): 	at android.app.ActivityThread.main(ActivityThread.java:10346)
E/FlutterLoader( 1809): 	at java.lang.reflect.Method.invoke(Native Method)
E/FlutterLoader( 1809): 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:638)
E/FlutterLoader( 1809): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:972)
E/FlutterLoader( 1809): Caused by: iz5: Could not find 'libflutter.so'. Looked for: [arm64-v8a, armeabi-v7a, armeabi], but only found: [].
E/FlutterLoader( 1809): 	at io.flutter.embedding.engine.FlutterJNI.loadLibrary(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:495)
E/FlutterLoader( 1809): 	at ie3.call(r8-map-id-4fcd48a84a1423494c505c7774aa4a5eefadf134c1c2fe74d282dde8786967d7:164)
E/FlutterLoader( 1809): 	at java.util.concurrent.FutureTask.run(FutureTask.java:328)
E/FlutterLoader( 1809): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1100)
E/FlutterLoader( 1809): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
E/FlutterLoader( 1809): 	at java.lang.Thread.run(Thread.java:1572)

Agent analysis

[!gpt-5.6-luna-in-pi]
Read v3.4.0 source and diffed against v3.5.0.

Root cause

v3.4.0 Android config and v3.5.0 Android config are effectively same. No ABI change caused crash.

Major v3.5.0 Android-relevant changes:

- flutter_readium: ^0.5.0
+ flutter_readium: ^0.6.0

+ image: ^4.10.1
+ pdfrx_engine: ^0.6.1

Those add PDFium native libraries:

libpdfium.so
libpdfium.cr.so
libpdfiumandroid.so

v3.4.0 did not contain PDFium native binaries.

v3.5.0 AAB also became much larger:

v3.4.0-era build: ~97 MB
v3.5.0 build:      ~162 MB

The uploaded v3.5.0 AAB contains:

base/lib/arm64-v8a/libflutter.so

But Play-installed app reports:

Looked for: [arm64-v8a, armeabi-v7a, armeabi], but only found: []

That means Play’s delivered native-library split is unusable. This is not missing arm64 Flutter output. It is native library packaging/install failure triggered by v3.5’s added PDFium stack.

Why local flutter run works

Local APK install does not follow Play’s App Bundle split delivery and native-library extraction path. It receives a fat/direct APK with native libraries available.

Play:

1. Processes AAB.
2. Generates ABI/device-specific split.
3. Installs native libraries through Android’s native-library packaging path.
4. Fails to expose libflutter.so at runtime.

Hence local release succeeds while Play version crashes before Dart starts.

Important distinction

flutter_readium 0.6.0 itself is not necessarily directly crashing. Its new PDFium dependency changes native .so packaging. The likely failure is:

PDFium native assets
→ AAB native library packaging/alignment
→ Play ABI split installation
→ FlutterLoader sees empty nativeLibraryDir
→ libflutter.so not found

Current local fix prepared

I removed unnecessary armeabi-v7a and added:

packaging {
    jniLibs {
        useLegacyPackaging = true
    }
}

This forces native libraries into extractable APK packaging, avoiding Play/Android 15+ failures where compressed or improperly aligned native libraries become invisible.

Still pending:

• Build fresh AAB.
• Confirm libflutter.so and PDFium exist in arm64 output.
• Check native alignment.
• Run Play preflight.
• Upload only after clean validation.

Current uncommitted files:

android/app/build.gradle.kts
pubspec.yaml

pubspec.yaml currently has version 3.5.0+50; no upload performed yet.