pderrenger
commented
2 months ago Hello! š 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[bot]
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!!