Example app not working

[valkrypton]

Hello,

I cloned the git repo and ran the example app on my phone without making any changes and I got this error message:

E/MethodChannel#ultralytics_yolo(27995):`` Failed to handle method call
E/MethodChannel#ultralytics_yolo(27995): java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.camera.lifecycle.ProcessCameraProvider.unbindAll()' on a null object reference
E/MethodChannel#ultralytics_yolo(27995): at com.ultralytics.ultralytics_yolo.CameraPreview.bindPreview(CameraPreview.java:79)
E/MethodChannel#ultralytics_yolo(27995): at com.ultralytics.ultralytics_yolo.CameraPreview.setCameraFacing(CameraPreview.java:97)
E/MethodChannel#ultralytics_yolo(27995): at com.ultralytics.ultralytics_yolo.MethodCallHandler.setLensDirection(MethodCallHandler.java:260)
E/MethodChannel#ultralytics_yolo(27995): at com.ultralytics.ultralytics_yolo.MethodCallHandler.onMethodCall(MethodCallHandler.java:95)
E/MethodChannel#ultralytics_yolo(27995): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/MethodChannel#ultralytics_yolo(27995): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/MethodChannel#ultralytics_yolo(27995): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/MethodChannel#ultralytics_yolo(27995): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/MethodChannel#ultralytics_yolo(27995): at android.os.Handler.handleCallback(Handler.java:958)
E/MethodChannel#ultralytics_yolo(27995): at android.os.Handler.dispatchMessage(Handler.java:99)
E/MethodChannel#ultralytics_yolo(27995): at android.os.Looper.loopOnce(Looper.java:230)
E/MethodChannel#ultralytics_yolo(27995): at android.os.Looper.loop(Looper.java:319)
E/MethodChannel#ultralytics_yolo(27995): at android.app.ActivityThread.main(ActivityThread.java:8893)
E/MethodChannel#ultralytics_yolo(27995): at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#ultralytics_yolo(27995): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
E/MethodChannel#ultralytics_yolo(27995): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
E/flutter (27995): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(error, Attempt to invoke virtual method 'void androidx.camera.lifecycle.ProcessCameraProvider.unbindAll()' on a null object reference, null, java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.camera.lifecycle.ProcessCameraProvider.unbindAll()' on a null object reference
E/flutter (27995): at com.ultralytics.ultralytics_yolo.CameraPreview.bindPreview(CameraPreview.java:79)
E/flutter (27995): at com.ultralytics.ultralytics_yolo.CameraPreview.setCameraFacing(CameraPreview.java:97)
E/flutter (27995): at com.ultralytics.ultralytics_yolo.MethodCallHandler.setLensDirection(MethodCallHandler.java:260)
E/flutter (27995): at com.ultralytics.ultralytics_yolo.MethodCallHandler.onMethodCall(MethodCallHandler.java:95)
E/flutter (27995): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/flutter (27995): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:292)
E/flutter (27995): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:319)
E/flutter (27995): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter (27995): at android.os.Handler.handleCallback(Handler.java:958)
E/flutter (27995): at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter (27995): at android.os.Looper.loopOnce(Looper.java:230)
E/flutter (27995): at android.os.Looper.loop(Looper.java:319)
E/flutter (27995): at android.app.ActivityThread.main(ActivityThread.java:8893)
E/flutter (27995): at java.lang.reflect.Method.invoke(Native Method)
E/flutter (27995): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:608)
E/flutter (27995): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1103)
E/flutter (27995): )
E/flutter (27995): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter (27995): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:334:18)
E/flutter (27995):
E/flutter (27995): #2 UltralyticsYoloCameraController.toggleLensDirection (package:ultralytics_yolo/camera_preview/ultralytics_yolo_camera_controller.dart:48:5)
E/flutter (27995):
E/flutter (27995):

Help would be appreciated!!

[pderrenger]

Hello! 😊 It looks like you've encountered a NullPointerException related to the camera lifecycle in the Ultralytics example app. This is typically due to the ProcessCameraProvider not being initialized before its usage.

Please make sure your app has the correct permissions for camera usage in your AndroidManifest.xml. Additionally, verify that your device is compatible and that no other app is using the camera resource.

If the issue persists, consider initializing the ProcessCameraProvider in your activity or fragment's lifecycle properly before attempting to bind or unbind the camera. Here is an example snippet that might help:

ProcessCameraProvider cameraProvider = ... // get instance here
if(cameraProvider != null) {
    cameraProvider.unbindAll(); // This is where the error points.
    // Further processing...
}

For more detailed information on managing the camera lifecycle, please refer to the Android developer documentation on camera X libraries.

Should this not resolve the issue, please provide us with more details about your setup (device model, Android version, etc.), and we'll be glad to look further into it. Remember, checking the Ultralytics Docs at https://docs.ultralytics.com for additional guidance might also be helpful.

Happy coding!

[github-actions]

👋 Hello there! We wanted to give you a friendly reminder that this issue has not had any recent activity and may be closed soon, but don't worry - you can always reopen it if needed. If you still have any questions or concerns, please feel free to let us know how we can help.

For additional resources and information, please see the links below:

• Docs: https://docs.ultralytics.com
• HUB: https://hub.ultralytics.com
• Community: https://community.ultralytics.com

Feel free to inform us of any other issues you discover or feature requests that come to mind in the future. Pull Requests (PRs) are also always welcomed!

Thank you for your contributions to YOLO 🚀 and Vision AI ⭐

[huats]

It seems related to #38

[glenn-jocher]

@huats please ensure you're using the latest version of the app. If the issue persists, try checking the camera permissions and initialization process. If it's related to #38, following any updates or fixes there might help.

[huats]

@glenn-jocher thanks for your answer. I will answer you in #38

[glenn-jocher]

Please continue the discussion in #38, and we'll address any further questions there. Thank you!