can't deal with hardware backbutton?

[kotran88]

Environment

Flutter version:

3.24.1

Plugin version:

6.0.0

Android version:

latest version

iOS version: Xcode version:
Device information:

Description

I still can't find how to disable or work well with hardware back button on android device, currently , when I press it, it terminate app with error below

D/SessionLifecycleService(27361): Activity backgrounding at 18032050
I/ViewRootImpl@93e145b[MainActivity](27361): handleWindowFocusChanged: 0 0 call from android.view.ViewRootImpl.-$$Nest$mhandleWindowFocusChanged:0
I/ImeFocusController(27361): onPreWindowFocus: skipped, hasWindowFocus=false mHasImeFocus=true
I/ImeFocusController(27361): onPostWindowFocus: skipped, hasWindowFocus=false mHasImeFocus=true
D/InputTransport(27361): Input channel destroyed: 'ClientS', fd=159
I/ViewRootImpl@93e145b[MainActivity](27361): handleAppVisibility mAppVisible = true visible = false
I/SurfaceView@5783d2d(27361): onWindowVisibilityChanged(8) false io.flutter.embedding.android.FlutterSurfaceView{5783d2d V.E...... ........ 0,0-840,2163} of ViewRootImpl@93e145b[MainActivity]
I/SurfaceView(27361): 91766061 Changes: creating=false format=false size=false visible=true alpha=false hint=false visible=true left=false top=false z=false attached=true lifecycleStrategy=false
I/SurfaceView@5783d2d(27361): 91766061 Cur surface: Surface(name=null)/@0x1adef58
I/SurfaceView(27361): 91766061 surfaceDestroyed
I/SurfaceView@5783d2d(27361): surfaceDestroyed callback.size 1 #2 io.flutter.embedding.android.FlutterSurfaceView{5783d2d V.E...... ........ 0,0-840,2163}
I/SurfaceView@5783d2d(27361): updateSurface: mVisible = false mSurface.isValid() = true
I/SurfaceView@5783d2d(27361): releaseSurfaces: viewRoot = ViewRootImpl@93e145b[MainActivity]
V/SurfaceView@5783d2d(27361): Layout: x=0 y=0 w=840 h=2163, frame=Rect(0, 0 - 840, 2163)
I/ViewRootImpl@93e145b[MainActivity](27361): destroyHardwareResources: Callers=android.view.ViewRootImpl.performTraversals:3932 android.view.ViewRootImpl.doTraversal:3288 android.view.ViewRootImpl$TraversalRunnable.run:11344 android.view.Choreographer$CallbackRecord.run:1689 android.view.Choreographer$CallbackRecord.run:1698 android.view.Choreographer.doCallbacks:1153 android.view.Choreographer.doFrame:1079 android.view.Choreographer$FrameDisplayEventReceiver.run:1646 android.os.Handler.handleCallback:958 android.os.Handler.dispatchMessage:99 
D/SurfaceView(27361): 17277644 windowPositionLost, frameNr = 0
D/OpenGLRenderer(27361): CacheManager::trimMemory(20)
I/ViewRootImpl@93e145b[MainActivity](27361): Relayout returned: old=(0,0,840,2289) new=(0,0,840,2289) relayoutAsync=false req=(840,2289)8 dur=3 res=0x402 s={false 0x0} ch=true seqId=0
I/SurfaceView@5783d2d(27361): windowStopped(true) false io.flutter.embedding.android.FlutterSurfaceView{5783d2d V.E...... ........ 0,0-840,2163} of ViewRootImpl@93e145b[MainActivity]
D/SurfaceView@5783d2d(27361): updateSurface: surface is not valid
I/SurfaceView@5783d2d(27361): releaseSurfaces: viewRoot = ViewRootImpl@93e145b[MainActivity]
D/SurfaceView@5783d2d(27361): updateSurface: surface is not valid
I/SurfaceView@5783d2d(27361): releaseSurfaces: viewRoot = ViewRootImpl@93e145b[MainActivity]
D/OpenGLRenderer(27361): CacheManager::trimMemory(40)
I/ViewRootImpl@93e145b[MainActivity](27361): stopped(true) old = false
D/ViewRootImpl@93e145b[MainActivity](27361): WindowStopped on com.onofflab.dhauto/com.onofflab.dhauto.MainActivity set to true
D/OpenGLRenderer(27361): RenderThread::destroyRenderingContext()
I/SurfaceView(27361): 91766061 Detaching SV
D/SurfaceView@5783d2d(27361): updateSurface: surface is not valid
I/SurfaceView@5783d2d(27361): releaseSurfaces: viewRoot = ViewRootImpl@93e145b[MainActivity]
I/SurfaceView@5783d2d(27361): onDetachedFromWindow: tryReleaseSurfaces()
I/SurfaceView@5783d2d(27361): releaseSurfaces: viewRoot = ViewRootImpl@93e145b[MainActivity]
D/SurfaceView@5783d2d(27361): 91766061 setAlpha: alpha=0.0
D/SurfaceView@5783d2d(27361): 91766061 updateSurface: has no frame
D/AndroidRuntime(27361): Shutting down VM
E/AndroidRuntime(27361): FATAL EXCEPTION: main
E/AndroidRuntime(27361): Process: com.onofflab.dhauto, PID: 27361
E/AndroidRuntime(27361): java.lang.RuntimeException: Unable to destroy activity {com.onofflab.dhauto/com.onofflab.dhauto.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference
E/AndroidRuntime(27361):        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:6149)
E/AndroidRuntime(27361):        at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:6181)
E/AndroidRuntime(27361):        at android.app.servertransaction.DestroyActivityItem.execute(DestroyActivityItem.java:47)
E/AndroidRuntime(27361):        at android.app.servertransaction.ActivityTransactionItem.execute(ActivityTransactionItem.java:45)
E/AndroidRuntime(27361):        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:180)
E/AndroidRuntime(27361):        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:98)
E/AndroidRuntime(27361):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2685)
E/AndroidRuntime(27361):        at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(27361):        at android.os.Looper.loopOnce(Looper.java:230)
E/AndroidRuntime(27361):        at android.os.Looper.loop(Looper.java:319)
E/AndroidRuntime(27361):        at android.app.ActivityThread.main(ActivityThread.java:8919)
E/AndroidRuntime(27361):        at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(27361):        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:578)
E/AndroidRuntime(27361):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
E/AndroidRuntime(27361): Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.lifecycle.Lifecycle.removeObserver(androidx.lifecycle.LifecycleObserver)' on a null object reference
E/AndroidRuntime(27361):        at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.clearPluginSetup(FlutterBarcodeScannerPlugin.java:295)
E/AndroidRuntime(27361):        at com.amolg.flutterbarcodescanner.FlutterBarcodeScannerPlugin.onDetachedFromActivity(FlutterBarcodeScannerPlugin.java:285)
E/AndroidRuntime(27361):        at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.detachFromActivity(FlutterEngineConnectionRegistry.java:381)
E/AndroidRuntime(27361):        at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDetach(FlutterActivityAndFragmentDelegate.java:747)
E/AndroidRuntime(27361):        at io.flutter.embedding.android.FlutterFragment.onDetach(FlutterFragment.java:1176)
E/AndroidRuntime(27361):        at androidx.fragment.app.Fragment.performDetach(Fragment.java:3387)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentStateManager.detach(FragmentStateManager.java:862)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:355)
E/AndroidRuntime(27361):        at androidx.fragment.app.SpecialEffectsController$FragmentStateManagerOperation.complete$fragment_release(SpecialEffectsController.kt:805)
E/AndroidRuntime(27361):        at androidx.fragment.app.SpecialEffectsController$Operation.cancel(SpecialEffectsController.kt:641)
E/AndroidRuntime(27361):        at androidx.fragment.app.SpecialEffectsController.forceCompleteAllOperations(SpecialEffectsController.kt:355)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3201)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentManager.dispatchDestroy(FragmentManager.java:3152)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentController.dispatchDestroy(FragmentController.java:346)
E/AndroidRuntime(27361):        at androidx.fragment.app.FragmentActivity.onDestroy(FragmentActivity.java:258)
E/AndroidRuntime(27361):        at android.app.Activity.performDestroy(Activity.java:9274)
E/AndroidRuntime(27361):        at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1491)
E/AndroidRuntime(27361):        at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:6136)
E/AndroidRuntime(27361):        ... 13 more
I/Process (27361): Sending signal. PID: 27361 SIG: 9
Lost connection to device.

my code is very simple

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () async {
        print(" go back..");
        if (_canGoBack) {
          print("can go back..");
          webViewController?.goBack();
          return false;
        }
        return true;
      },
      child: Scaffold(
        resizeToAvoidBottomInset: false,
        body: InAppWebView(
          initialUrlRequest: URLRequest(
            url: WebUri("http://xxx.xxx.xxx:8081"),
          ),
          onWebViewCreated: (controller) {
            webViewController = controller;
          },
          onLoadStop: (controller, url) async {
            _canGoBack = await controller.canGoBack();
          },
        ),
      ),
    );
  }

[github-actions[bot]]

👋 @kotran88

NOTE: This comment is auto-generated.

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In the meantime, you can already search for some possible solutions online! Because this plugin uses native WebView, you can search online for the same issue adding android WebView [MY ERROR HERE] or ios WKWebView [MY ERROR HERE] keywords.

Following these steps can save you, me, and other people a lot of time, thanks!

[bnoirant]

WillPopScope is deprecated, use PopScope instead

[kotran88]

WillPopScope is deprecated, use PopScope instead

so , is it working hardware backbutton? I think remain same

@override
  Widget build(BuildContext context) {
    return PopScope(
          child: InAppWebView(
            initialUrlRequest: URLRequest(
                  url: WebUri("http://202.31.237.173:8081"),  // 웹뷰 초기 URL
                ),
            onWebViewCreated: (InAppWebViewController controller) {
              webViewController = controller;
            },
            onLoadStart: (controller, url) {
              // Optionally update UI or perform actions when page starts loading
            },
            onLoadStop: (controller, url) async {
              print("onLoadStoponLoadStop");
              bool canGoBack = await webViewController?.canGoBack() ?? false;
              print("canGoBackcanGoBackcanGoBackcanGoBack");
              print(canGoBack);
              setState(() {
                _canGoBack = canGoBack;
              });
            },
          ),
        );
  }