Android Java Lang Runtimeexception Fail to Connect to Camera Service

android java lang runtimeexception fail to connect to camera service

try this...

 static Camera camera = null;

declare it on top.

 try{ 
   if(clickOn == true) {
       clickOn = false;
       camera = Camera.open();
       Parameters parameters = camera.getParameters();
       parameters.setFlashMode(Parameters.FLASH_MODE_TORCH);
       camera.setParameters(parameters);
       camera.startPreview();

       remoteViews.setViewVisibility(R.id.button1, View.GONE);
       remoteViews.setViewVisibility(R.id.button2, View.VISIBLE);
       localAppWidgetManager.updateAppWidget(componentName, remoteViews);
   } else {
       clickOn = true;
       camera.stopPreview();
       camera.release();
       camera = null;

       remoteViews.setViewVisibility(R.id.button1, View.VISIBLE);
       remoteViews.setViewVisibility(R.id.button2, View.GONE);
       localAppWidgetManager.updateAppWidget(componentName, remoteViews);
   }    
} catch(Exception e) {
   Log.e("Error", ""+e);
}

How to fix Fail to connect to camera service exception in Android emulator

From the Android Developers Docs:

Calling Camera.open() throws an exception if the camera is already in use by another application, so we wrap it in a try block.

Try wrapping that code in a try catch block like so:

try {
    releaseCameraAndPreview();
    if (camId == 0) {
        mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_FRONT);
    }
    else {
        mCamera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK);
    }
} catch (Exception e) {
    Log.e(getString(R.string.app_name), "failed to open Camera");
    e.printStackTrace();
}

Then add this function somewhere:

private void releaseCameraAndPreview() {
    myCameraPreview.setCamera(null);
    if (mCamera != null) {
        mCamera.release();
        mCamera = null;
    }
}

ERROR: failed to connect to camera service @ Android marshmallow

You need to give android.hardware.Camera permission programmatically.

MANIFEST PERMISSIONS WON'T WORK on Android 6

With marshmallow(newest version of Android). We have got some
restrictions in Using Sensitive permissions like :
Storage,Contacts access, etc..In edition to give these permissions in
manifest, We need to request them from users at Runtime.

For more details refer this : Android M permissions

Add this code in your activity :

@Override
protected void onStart() {
    super.onStart();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

        int hasCameraPermission = checkSelfPermission(Manifest.permission.CAMERA);

        List<String> permissions = new ArrayList<String>();

        if (hasCameraPermission != PackageManager.PERMISSION_GRANTED) {
            permissions.add(Manifest.permission.CAMERA);

        } 
        if (!permissions.isEmpty()) {
            requestPermissions(permissions.toArray(new String[permissions.size()]), 111);
        }
    }

}

Add this after onActivityResult :

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case 111: {
            for (int i = 0; i < permissions.length; i++) {
                if (grantResults[i] == PackageManager.PERMISSION_GRANTED) {
                    System.out.println("Permissions --> " + "Permission Granted: " + permissions[i]);

                } else if (grantResults[i] == PackageManager.PERMISSION_DENIED) {
                    System.out.println("Permissions --> " + "Permission Denied: " + permissions[i]);

                }
            }
        }
        break;
        default: {
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }
}

Failed to connect to camera service

Few things:

1. Why are your use-permissions and use-features tags in your activity tag. Generally, permissions are included as direct children of your <manifest> tag. This could be part of the problem.

2. According to the android camera open documentation, a runtime exception is thrown:

   if connection to the camera service fails (for example, if the camera is in use by another process or device policy manager has disabled the camera)

   Have you tried checking if the camera is being used by something else or if your policy manager has some setting where the camera is turned off?

3. Don't forget the <uses-feature android:name="android.hardware.camera.autofocus" /> for autofocus.

While I'm not sure if any of these will directly help you, I think they're worth investigating if for no other reason than to simply rule out. Due diligence if you will.

EDIT
As mentioned in the comments below, the solution was to move the uses-permissions up to above the application tag.

Xamarin Forms Java.Lang.RuntimeException: Fail to connect to camera service

Just make a conclusion of the comments:

You need to request permissions at runtime when you want to use camera in Android project.

To request permissions, you can use Xamarin.Essentials: Permissions:

 var status = await Permissions.RequestAsync<Permissions.Camera>();

There are also many other permission request information in the document.

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