Implementing 'face' for android app

Issue 1: face package not recognized in opencv:4.1.0
implementation 'com.quickbirdstudios:opencv:4.1.0'
implementation 'com.quickbirdstudios:opencv:4.1.0-contrib'

error: package org.opencv.face does not exist
error: cannot find symbol class FaceRecognizer  

Issue 2: model.read() function not seeing file (returns null pointer error)
--> I am trying to read a saved YAML model and load it into my new FaceRecognizer object.
--> The model is saved in the external files directory (is this the best option)
--> Does the 'read' function have the ability to read from this directory?

To account for Issue 1, using 3.4.1
implementation 'com.quickbirdstudios:opencv:3.4.1'
implementation 'com.quickbirdstudios:opencv:3.4.4-contrib'

String externalDir = getExternalFilesDir (Environment.getDataDirectory().getAbsolutePath()) .getAbsolutePath();
String modelPath = externalDir+"/model.yml";
FaceRecognizer model;
model.read(modelPath);

java.lang.NullPointerException: Attempt to invoke virtual method 'void org.opencv.face.FaceRecognizer.read(java.lang.String)' on a null object reference

[sellmair]

Please create separate GitHub issues for each "issue" next time 👍

Issue 1:
You should not implement both dependencies:

implementation 'com.quickbirdstudios:opencv:4.1.0' // <--- not necessary
implementation 'com.quickbirdstudios:opencv:4.1.0-contrib'

Can you try, if that fixes your issue?

Issue 2:
The sample snippet does show that you create the model anywhere.

@sellmair
Removing the first dependency did not work.
For creating the model, the constructors are protected. Is there a work-around for this issue?

FaceRecognizer model = new FaceRecognizer(long); // the constructor has protected access in "org.opencv.face.FaceRecognizer"

Please create separate GitHub issues for each "issue" next time 👍

Issue 1:
You should not implement both dependencies:

implementation 'com.quickbirdstudios:opencv:4.1.0' // <--- not necessary
implementation 'com.quickbirdstudios:opencv:4.1.0-contrib'

Can you try, if that fixes your issue?

Issue 2:
The sample snippet does show that you crate the model anywhere.

[sellmair]

I never worked with the FaceRegognizer API's so you might want to ask your questions on the official OpenCV forum. I am sure you can expect help relatively quickly.