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Single cached engine can't work with multi FlutterFragment #49950

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Single cached engine can't work with multi FlutterFragment#49950
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P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworka: existing-appsIntegration with existing apps via the add-to-app flowengineflutter/engine related. See also e: labels.found in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-androidAndroid applications specificallyteam-androidOwned by Android platform teamtriaged-androidTriaged by Android platform team
@littleGnAl

Description

@littleGnAl
littleGnAl
opened on Feb 1, 2020

I try to reuse the same cached engine in multi FlutterFragments, and each FlutterFragment host by a standalone Activity, which is named MainActivity in the sample code, here's the sample code:

class MainActivity : AppCompatActivity() {

    private val TAG_FLUTTER_FRAGMENT = "flutter_fragment"

    private var flutterFragment: FlutterFragment? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        Log.setLogLevel(android.util.Log.VERBOSE)
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        if (FlutterEngineCache.getInstance().get("cache_engine") == null) {
            val flutterEngine = FlutterEngine(applicationContext)
            flutterEngine.navigationChannel.setInitialRoute("/")
            flutterEngine.dartExecutor
                .executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault())
            FlutterEngineCache.getInstance().put("cache_engine", flutterEngine)
        }

        // Start a new FlutterFragment which host by MainActivity
        findViewById<AppCompatButton>(R.id.btnAddFragment).setOnClickListener {
            startActivity(Intent(this, MainActivity::class.java))
        }

        // Finish MainActivity
        findViewById<AppCompatButton>(R.id.btnPopFragment).setOnClickListener {
            finish()
        }

        flutterFragment = supportFragmentManager
            .findFragmentByTag(TAG_FLUTTER_FRAGMENT) as? FlutterFragment

        if (flutterFragment == null) {
            val ff: FlutterFragment = FlutterFragment
                .withCachedEngine("cache_engine")
                .transparencyMode(FlutterView.TransparencyMode.transparent)
                .renderMode(FlutterView.RenderMode.texture)
                .build()
            supportFragmentManager
                .beginTransaction()
                .add(
                    R.id.flFlutterFragment,
                    ff as Fragment,
                    TAG_FLUTTER_FRAGMENT
                )
                .commit()
        }
    }

    override fun onPostResume() {
        super.onPostResume()
        flutterFragment?.onPostResume()
    }

    override fun onNewIntent(intent: Intent) {
        flutterFragment?.onNewIntent(intent)
        super.onNewIntent(intent)
    }

    override fun onBackPressed() {
        flutterFragment?.onBackPressed()
    }

    override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<String?>,
        grantResults: IntArray
    ) {
        flutterFragment?.onRequestPermissionsResult(
            requestCode,
            permissions,
            grantResults
        )
    }

    override fun onUserLeaveHint() {
        flutterFragment?.onUserLeaveHint()
    }

    override fun onTrimMemory(level: Int) {
        super.onTrimMemory(level)
        flutterFragment?.onTrimMemory(level)
    }
}

It works fine if there's only one "MainActivity", but the FlutterFragment seems to be frozen when a new "MainActivity" has been added or resumed by finishing the topmost "MainActivity".

uuuuu

The actual behavior is as follow:

ezgif com-video-to-gif (2)

Here's the sample code that can reproduce the problem. https://github.com/littleGnAl/single-engine-multi-fragments

Steps to Reproduce

  1. Click the bottom-right float action button to count some numbers
  2. Click "ADD NEW ACTIVITY" to add a new Activity
  3. Try click the bottom-right float action button to count some numbers
  4. Click "FINISH" to finish the topmost Activity
  5. Try click the bottom-right float action button to count some numbers

Expected results:
The MainActivity should work fine after resume
Actual results:
The FlutterFragment inside MainActivity has been frozen after resume

Logs

Android studio logcat

2020-02-02 16:53:02.491 29167-29167/? I/nemultifragmen: Late-enabling -Xcheck:jni
2020-02-02 16:53:02.529 29167-29167/? E/nemultifragmen: Unknown bits set in runtime_flags: 0x8000
2020-02-02 16:53:02.891 29167-29167/? W/nemultifragmen: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (greylist, reflection, allowed)
2020-02-02 16:53:02.892 29167-29167/? W/nemultifragmen: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (greylist, reflection, allowed)
2020-02-02 16:53:02.930 29167-29233/? I/ResourceExtractor: Found extracted resources res_timestamp-1-1580633324092
2020-02-02 16:53:02.935 29167-29167/? V/FlutterEngine: Attaching to JNI.
2020-02-02 16:53:02.942 29167-29167/? I/Adreno: QUALCOMM build                   : bc00834, I609ab310b2
    Build Date                       : 04/11/19
    OpenGL ES Shader Compiler Version: EV031.26.07.00
    Local Branch                     : 
    Remote Branch                    : 
    Remote Branch                    : 
    Reconstruct Branch               : 
2020-02-02 16:53:02.942 29167-29167/? I/Adreno: Build Config                     : S L 8.0.6 AArch64
2020-02-02 16:53:02.947 29167-29167/? I/Adreno: PFP: 0x005ff110, ME: 0x005ff066
2020-02-02 16:53:03.016 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/isolate'
2020-02-02 16:53:03.016 29167-29167/? V/DartExecutor: Attached to JNI. Registering the platform message handler for this Dart execution context.
2020-02-02 16:53:03.018 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/accessibility'
2020-02-02 16:53:03.019 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/platform'
2020-02-02 16:53:03.020 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/textinput'
2020-02-02 16:53:03.022 29167-29167/? V/NavigationChannel: Sending message to set initial route to '/'
2020-02-02 16:53:03.023 29167-29167/? V/DartMessenger: Sending message with callback over channel 'flutter/navigation'
2020-02-02 16:53:03.023 29167-29167/? V/DartExecutor: Executing Dart entrypoint: DartEntrypoint( bundle path: flutter_assets, function: main )
2020-02-02 16:53:03.038 29167-29167/? D/FlutterActivityAndFragmentDelegate: Setting up FlutterEngine.
2020-02-02 16:53:03.039 29167-29167/? D/FlutterActivityAndFragmentDelegate: Attaching FlutterEngine to the Activity that owns this Fragment.
2020-02-02 16:53:03.039 29167-29167/? V/FlutterEnginePluginRegistry: Attaching to an Activity: com.littlegnal.singleenginemultifragment.MainActivity@b635777.
2020-02-02 16:53:03.040 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/platform_views'
2020-02-02 16:53:03.041 29167-29167/? V/FlutterActivityAndFragmentDelegate: Creating FlutterView.
2020-02-02 16:53:03.044 29167-29167/? V/FlutterView: Initializing FlutterView
2020-02-02 16:53:03.044 29167-29167/? V/FlutterView: Internally using a FlutterTextureView.
2020-02-02 16:53:03.047 29167-29167/? V/FlutterActivityAndFragmentDelegate: onActivityCreated. Giving plugins an opportunity to restore state.
2020-02-02 16:53:03.047 29167-29167/? V/FlutterEnginePluginRegistry: Forwarding onRestoreInstanceState() to plugins.
2020-02-02 16:53:03.048 29167-29167/? V/FlutterActivityAndFragmentDelegate: onStart()
2020-02-02 16:53:03.051 29167-29167/? V/FlutterActivityAndFragmentDelegate: onResume()
2020-02-02 16:53:03.051 29167-29167/? V/LifecycleChannel: Sending AppLifecycleState.resumed message.
2020-02-02 16:53:03.051 29167-29167/? V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:53:03.065 29167-29167/? V/FlutterActivityAndFragmentDelegate: Attaching FlutterEngine to FlutterView.
2020-02-02 16:53:03.065 29167-29167/? D/FlutterView: Attaching to a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@ed5547d
2020-02-02 16:53:03.065 29167-29167/? V/FlutterTextureView: Attaching to FlutterRenderer.
2020-02-02 16:53:03.066 29167-29167/? V/DartMessenger: Setting handler for channel 'flutter/textinput'
2020-02-02 16:53:03.067 29167-29167/? V/DartMessenger: Sending message with callback over channel 'flutter/textinput'
2020-02-02 16:53:03.075 29167-29167/? W/nemultifragmen: Accessing hidden method Landroid/view/accessibility/AccessibilityNodeInfo;->getSourceNodeId()J (greylist, reflection, allowed)
2020-02-02 16:53:03.075 29167-29167/? W/nemultifragmen: Accessing hidden method Landroid/view/accessibility/AccessibilityRecord;->getSourceNodeId()J (greylist, reflection, allowed)
2020-02-02 16:53:03.075 29167-29167/? W/nemultifragmen: Accessing hidden field Landroid/view/accessibility/AccessibilityNodeInfo;->mChildNodeIds:Landroid/util/LongArray; (greylist, reflection, allowed)
2020-02-02 16:53:03.075 29167-29167/? W/nemultifragmen: Accessing hidden method Landroid/util/LongArray;->get(I)J (greylist, reflection, allowed)
2020-02-02 16:53:03.077 29167-29247/? I/flutter: Observatory listening on http://127.0.0.1:41033/u8VjL_eiyPk=/
2020-02-02 16:53:03.078 29167-29167/? V/SettingsChannel: Sending message: 
    textScaleFactor: 1.0
    alwaysUse24HourFormat: false
    platformBrightness: light
2020-02-02 16:53:03.078 29167-29167/? V/DartMessenger: Sending message with callback over channel 'flutter/settings'
2020-02-02 16:53:03.079 29167-29167/? V/LocalizationChannel: Sending Locales to Flutter.
2020-02-02 16:53:03.079 29167-29167/? V/LocalizationChannel: Locale (Language: zh, Country: CN, Variant: )
2020-02-02 16:53:03.079 29167-29167/? V/LocalizationChannel: Locale (Language: en, Country: US, Variant: )
2020-02-02 16:53:03.079 29167-29167/? V/DartMessenger: Sending message with callback over channel 'flutter/localization'
2020-02-02 16:53:03.079 29167-29167/? V/FlutterRenderer: Setting viewport metrics
    Size: 0 x 0
    Padding - L: 0, T: 0, R: 0, B: 0
    Insets - L: 0, T: 0, R: 0, B: 0
    System Gesture Insets - L: 0, T: 0, R: 0, B: 0
2020-02-02 16:53:03.106 29167-29167/? V/FlutterView: Size changed. Sending Flutter new viewport metrics. FlutterView was 0 x 0, it is now 1440 x 2362
2020-02-02 16:53:03.106 29167-29167/? V/FlutterRenderer: Setting viewport metrics
    Size: 1440 x 2362
    Padding - L: 0, T: 0, R: 0, B: 0
    Insets - L: 0, T: 0, R: 0, B: 0
    System Gesture Insets - L: 0, T: 0, R: 0, B: 0
2020-02-02 16:53:03.116 29167-29167/? V/FlutterTextureView: SurfaceTextureListener.onSurfaceTextureAvailable()
2020-02-02 16:53:03.187 29167-29221/? W/Gralloc3: mapper 3.x is not supported
2020-02-02 16:53:03.193 29167-29167/? V/DartMessenger: Received message from Dart over channel 'flutter/isolate'
2020-02-02 16:53:03.193 29167-29167/? V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:53:03.599 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:53:03.599 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:53:03.600 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemChrome.setApplicationSwitcherDescription' message.
2020-02-02 16:53:04.198 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:53:04.198 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:53:04.198 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemChrome.setSystemUIOverlayStyle' message.
2020-02-02 16:53:04.210 29167-29235/com.littlegnal.singleenginemultifragment W/Gralloc3: allocator 3.x is not supported
2020-02-02 16:55:01.347 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:01.347 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:01.347 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:01.662 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:01.662 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:01.663 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:02.243 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:02.243 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:02.244 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:02.801 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:02.801 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:02.801 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:03.278 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:03.278 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:03.279 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:05.222 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onPause()
2020-02-02 16:55:05.222 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.inactive message.
2020-02-02 16:55:05.223 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:05.228 29167-29167/com.littlegnal.singleenginemultifragment W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@4fb9607
2020-02-02 16:55:05.260 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterActivityAndFragmentDelegate: Setting up FlutterEngine.
2020-02-02 16:55:05.260 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterActivityAndFragmentDelegate: Attaching FlutterEngine to the Activity that owns this Fragment.
2020-02-02 16:55:05.260 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterEnginePluginRegistry: Attaching to an Activity: com.littlegnal.singleenginemultifragment.MainActivity@7d5ed2.
2020-02-02 16:55:05.260 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterEnginePluginRegistry: Detaching from an Activity: com.littlegnal.singleenginemultifragment.MainActivity@b635777
2020-02-02 16:55:05.260 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Setting handler for channel 'flutter/platform_views'
2020-02-02 16:55:05.261 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: Creating FlutterView.
2020-02-02 16:55:05.261 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterView: Initializing FlutterView
2020-02-02 16:55:05.261 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterView: Internally using a FlutterTextureView.
2020-02-02 16:55:05.262 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onActivityCreated. Giving plugins an opportunity to restore state.
2020-02-02 16:55:05.262 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterEnginePluginRegistry: Forwarding onRestoreInstanceState() to plugins.
2020-02-02 16:55:05.262 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onStart()
2020-02-02 16:55:05.264 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onResume()
2020-02-02 16:55:05.264 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.resumed message.
2020-02-02 16:55:05.264 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:05.291 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterView: Size changed. Sending Flutter new viewport metrics. FlutterView was 0 x 0, it is now 1440 x 2362
2020-02-02 16:55:05.291 29167-29167/com.littlegnal.singleenginemultifragment W/FlutterView: Tried to send viewport metrics from Android to Flutter but this FlutterView was not attached to a FlutterEngine.
2020-02-02 16:55:05.297 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: SurfaceTextureListener.onSurfaceTextureAvailable()
2020-02-02 16:55:05.304 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: Attaching FlutterEngine to FlutterView.
2020-02-02 16:55:05.304 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterView: Attaching to a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@ed5547d
2020-02-02 16:55:05.304 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Attaching to FlutterRenderer.
2020-02-02 16:55:05.304 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Surface is available for rendering. Connecting FlutterRenderer to Android surface.
2020-02-02 16:55:05.316 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Setting handler for channel 'flutter/textinput'
2020-02-02 16:55:05.318 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/textinput'
2020-02-02 16:55:05.322 29167-29167/com.littlegnal.singleenginemultifragment V/SettingsChannel: Sending message: 
    textScaleFactor: 1.0
    alwaysUse24HourFormat: false
    platformBrightness: light
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/settings'
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Sending Locales to Flutter.
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Locale (Language: zh, Country: CN, Variant: )
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Locale (Language: en, Country: US, Variant: )
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/localization'
2020-02-02 16:55:05.323 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterRenderer: Setting viewport metrics
    Size: 1440 x 2362
    Padding - L: 0, T: 0, R: 0, B: 0
    Insets - L: 0, T: 0, R: 0, B: 0
    System Gesture Insets - L: 0, T: 0, R: 0, B: 0
2020-02-02 16:55:05.750 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onStop()
2020-02-02 16:55:05.750 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.paused message.
2020-02-02 16:55:05.751 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:05.751 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterView: Detaching from a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@ed5547d
2020-02-02 16:55:05.761 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Disconnecting FlutterRenderer from Android surface.
2020-02-02 16:55:05.764 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onSaveInstanceState. Giving plugins an opportunity to save state.
2020-02-02 16:55:05.764 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterEnginePluginRegistry: Forwarding onSaveInstanceState() to plugins.
2020-02-02 16:55:06.942 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:06.942 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:06.942 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:07.198 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:07.198 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:07.198 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:07.416 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:07.416 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:07.417 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:07.626 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:07.626 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:07.626 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:07.848 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:07.848 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:07.848 29167-29167/com.littlegnal.singleenginemultifragment V/PlatformChannel: Received 'SystemSound.play' message.
2020-02-02 16:55:08.789 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onPause()
2020-02-02 16:55:08.789 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.inactive message.
2020-02-02 16:55:08.789 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:08.801 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onStart()
2020-02-02 16:55:08.802 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onResume()
2020-02-02 16:55:08.802 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.resumed message.
2020-02-02 16:55:08.802 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:08.821 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: Attaching FlutterEngine to FlutterView.
2020-02-02 16:55:08.821 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterView: Attaching to a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@ed5547d
2020-02-02 16:55:08.821 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Attaching to FlutterRenderer.
2020-02-02 16:55:08.821 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Surface is available for rendering. Connecting FlutterRenderer to Android surface.
2020-02-02 16:55:08.827 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Setting handler for channel 'flutter/textinput'
2020-02-02 16:55:08.828 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/textinput'
2020-02-02 16:55:08.836 29167-29167/com.littlegnal.singleenginemultifragment V/SettingsChannel: Sending message: 
    textScaleFactor: 1.0
    alwaysUse24HourFormat: false
    platformBrightness: light
2020-02-02 16:55:08.837 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/settings'
2020-02-02 16:55:08.837 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Sending Locales to Flutter.
2020-02-02 16:55:08.837 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Locale (Language: zh, Country: CN, Variant: )
2020-02-02 16:55:08.837 29167-29167/com.littlegnal.singleenginemultifragment V/LocalizationChannel: Locale (Language: en, Country: US, Variant: )
2020-02-02 16:55:08.838 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/localization'
2020-02-02 16:55:08.838 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterRenderer: Setting viewport metrics
    Size: 1440 x 2362
    Padding - L: 0, T: 0, R: 0, B: 0
    Insets - L: 0, T: 0, R: 0, B: 0
    System Gesture Insets - L: 0, T: 0, R: 0, B: 0
2020-02-02 16:55:09.262 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onStop()
2020-02-02 16:55:09.262 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.paused message.
2020-02-02 16:55:09.263 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:09.263 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterView: Detaching from a FlutterEngine: io.flutter.embedding.engine.FlutterEngine@ed5547d
2020-02-02 16:55:09.268 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: Disconnecting FlutterRenderer from Android surface.
2020-02-02 16:55:09.269 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onDestroyView()
2020-02-02 16:55:09.271 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterTextureView: SurfaceTextureListener.onSurfaceTextureDestroyed()
2020-02-02 16:55:09.272 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterActivityAndFragmentDelegate: onDetach()
2020-02-02 16:55:09.272 29167-29167/com.littlegnal.singleenginemultifragment D/FlutterActivityAndFragmentDelegate: Detaching FlutterEngine from the Activity that owns this Fragment.
2020-02-02 16:55:09.272 29167-29167/com.littlegnal.singleenginemultifragment V/FlutterEnginePluginRegistry: Detaching from an Activity: com.littlegnal.singleenginemultifragment.MainActivity@7d5ed2
2020-02-02 16:55:09.272 29167-29167/com.littlegnal.singleenginemultifragment V/LifecycleChannel: Sending AppLifecycleState.detached message.
2020-02-02 16:55:09.272 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Sending message with callback over channel 'flutter/lifecycle'
2020-02-02 16:55:09.727 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:09.727 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:09.901 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:09.901 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:10.087 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:10.088 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:10.298 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:10.298 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.
2020-02-02 16:55:10.510 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Received message from Dart over channel 'flutter/platform'
2020-02-02 16:55:10.510 29167-29167/com.littlegnal.singleenginemultifragment V/DartMessenger: Deferring to registered handler to process message.

flutter doctor

[✓] Flutter (Channel stable, v1.12.13+hotfix.5, on Mac OS X 10.15.1 19B88, locale en-CN)
    • Flutter version 1.12.13+hotfix.5 at /Users/littlegnal/dev/flutter
    • Framework revision 27321ebbad (8 weeks ago), 2019-12-10 18:15:01 -0800
    • Engine revision 2994f7e1e6
    • Dart version 2.7.0

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
    • Android SDK at /Users/littlegnal/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-29, build-tools 29.0.2
    • ANDROID_HOME = /Users/littlegnal/Library/Android/sdk
    • Java binary at: /Applications/Android Studio 3.6 Preview.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.8.4

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio 3.6 Preview.app/Contents
    • Flutter plugin version 43.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] Android Studio
    • Android Studio at /Applications/Android Studio 4.0 Preview.app/Contents
    • Flutter plugin version 42.1.4
    • Dart plugin version 193.5731
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] VS Code (version 1.41.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.7.1

[✓] Connected device (1 available)
    • Pixel 2 XL • 801KPSL1456990 • android-arm64 • Android 10 (API 29)

• No issues found!

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    P2Important issues not at the top of the work lista: error messageError messages from the Flutter frameworka: existing-appsIntegration with existing apps via the add-to-app flowengineflutter/engine related. See also e: labels.found in release: 3.19Found to occur in 3.19found in release: 3.22Found to occur in 3.22has reproducible stepsThe issue has been confirmed reproducible and is ready to work onplatform-androidAndroid applications specificallyteam-androidOwned by Android platform teamtriaged-androidTriaged by Android platform team

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