[Android] Running an app with debug scene when the device is locked cause a black screen on Android #94921
Description
Flutter runs with a black screen when the device is locked and the screen is off on Android. It's reproducible almost 100% on some OnePlus devices.
Searched for relevant issues showing that some apps do have the same behavior when the app is left in the background for a while. All these might be related.
Steps to Reproduce
flutter create test_example.flutter run --verboseand make sure your device is locked and the screen is off.- Wait until you see the
Syncing files to device...appeared, and hang it for a couple of seconds. - Unlock your devices.
- App is a completely black screen.
To recover the normal behavior
- Push the app to the background.
- Pull it back from the background.
Verbose logs
I'll explain the behavior along with the log.
[ +10 ms] executing: /Volumes/T5/android-sdk/platform-tools/adb -s f8e67ce3 shell am start -a android.intent.action.RUN -f 0x20000000 --ez enable-background-compilation true --ez enable-dart-profiling true --ez enable-checked-mode true --ez verify-entry-points true --ez start-paused true com.example.flutter_test_app/com.example.flutter_test_app.MainActivity
[ +128 ms] Starting: Intent { act=android.intent.action.RUN flg=0x20000000 cmp=com.example.flutter_test_app/.MainActivity (has extras) }
[ ] Waiting for observatory port to be available...
[+1160 ms] Observatory URL on device: http://127.0.0.1:38541/F76tt4cIexk=/
[ +1 ms] executing: /Volumes/T5/android-sdk/platform-tools/adb -s f8e67ce3 forward tcp:0 tcp:38541
[ +18 ms] 64028
[ ] Forwarded host port 64028 to device port 38541 for Observatory
[ +10 ms] Caching compiled dill
[ +116 ms] Connecting to service protocol: http://127.0.0.1:64028/F76tt4cIexk=/
[ +32 ms] W/FlutterActivityAndFragmentDelegate( 9430): A splash screen was provided to Flutter, but this is deprecated. See flutter.dev/go/android-splash-migration for migration steps.
[ +499 ms] Launching a Dart Developer Service (DDS) instance at http://127.0.0.1:0, connecting to VM service at http://127.0.0.1:64028/F76tt4cIexk=/.
[ +369 ms] DDS is listening at http://127.0.0.1:64031/5vM-8dHEa5Q=/.
[ +76 ms] Successfully connected to service protocol: http://127.0.0.1:64028/F76tt4cIexk=/
[ +204 ms] DevFS: Creating new filesystem on the device (null)
[ +83 ms] DevFS: Created new filesystem on the device (file:///data/user/0/com.example.flutter_test_app/code_cache/flutter_test_appITIYOQ/flutter_test_app/)
[ +2 ms] Updating assets
Debug service listening on ws://127.0.0.1:64031/5vM-8dHEa5Q=/ws
[ +67 ms] Manifest contained wildcard assets. Inserting missing file into build graph to force rerun. for more information see #56466.
Syncing files to device ONEPLUS A6010...
[ +8 ms] <- reset
[ ] Compiling dart to kernel with 0 updated files
[ ] Processing bundle.
[ ] <- recompile package:testapp/main.dart 6d8be2ea-8af1-4012-9eb2-0d789c346a04
[ ] <- 6d8be2ea-8af1-4012-9eb2-0d789c346a04
[ +2 ms] Bundle processing done.
[ +90 ms] Updating files.
[ ] DevFS: Sync finished
[ +1 ms] Synced 0.0MB.
[ +2 ms] <- accept
[ +13 ms] Connected to _flutterView/0x70e0a65a70.
The phone is still locked, now let's unlock it.
[+43519 ms] D/PhoneWindow( 9430): setNavigationBarColor: 0
[ +15 ms] D/DecorView( 9430): onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@960c24b[MainActivity]
[ +2 ms] D/ViewRootImpl[MainActivity]( 9430): windowFocusChanged hasFocus=true inTouchMode=true
The device is now unlocked and presented with a black screen.
[+11249 ms] D/ViewRootImpl[MainActivity]( 9430): windowFocusChanged hasFocus=false inTouchMode=true
[+2006 ms] D/PhoneWindow( 9430): setNavigationBarColor: 0
[ +4 ms] D/ActivityThread( 9430): pid:9430 tid:9430 doframe Callback
[ +14 ms] E/lutter_test_ap( 9430): Invalid ID 0x00000001.
[ +17 ms] D/DecorView( 9430): onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@960c24b[MainActivity]
[ +1 ms] D/ViewRootImpl[MainActivity]( 9430): windowFocusChanged hasFocus=true inTouchMode=true
After pushing it into the background and pulling it back, a doframe Callback method seems to be called, then the app displayed correctly.
Environment
Device: OnePlus A6010 (OnePlus 6T)
System version: Android 11
[✓] Flutter (Channel master, 2.6.0-12.0.pre.976, on macOS 12.0.1 21A559 darwin-x64, locale zh-Hans-CN)
• Flutter version 2.6.0-12.0.pre.976 at /Users/alex/Documents/flutter-master
• Upstream repository https://github.com/AlexV525/flutter
• Framework revision ca7b823d93 (66 minutes ago), 2021-12-09 02:54:08 -0500
• Engine revision 716d1b0998
• Dart version 2.16.0 (build 2.16.0-85.0.dev)
• DevTools version 2.9.1
• Pub download mirror https://pub.flutter-io.cn
• Flutter download mirror https://storage.flutter-io.cn
[✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
• Android SDK at /Volumes/T5/android-sdk
• Platform android-31, build-tools 31.0.0
• ANDROID_HOME = /Volumes/T5/android-sdk
• ANDROID_SDK_ROOT = /Volumes/T5/android-sdk
• Java binary at: /Library/Java/JavaVirtualMachines/adoptopenjdk-11.jdk/Contents/Home/bin/java
• Java version OpenJDK Runtime Environment AdoptOpenJDK-11.0.11+9 (build 11.0.11+9)
• All Android licenses accepted.
[✓] Connected device (1 available)
• ONEPLUS A6010 (mobile) • f8e67ce3 • android-arm64 • Android 11 (API 30)
• No issues found!