Why is the new FaceDetector Play-Services not available on some devices?

Question

Background

Google released a few months ago a new API for detecting faces in bitmaps:

• http://android-developers.blogspot.co.il/2015/08/face-detection-in-google-play-services.html
• https://developers.google.com/vision/introduction#apis
• https://developers.google.com/vision/face-detection-concepts#face_orientation
• https://search-codelabs.appspot.com/codelabs/face-detection#1
• https://github.com/googlesamples/android-vision

It should be faster and better than the built-in FaceDetector class , and it has no limitations / compared to it (for example, the need for the input bitmap to have a configuration of 565, the width of the bitmap, which even has maximum edges for detection).

The code is pretty simple:

manifest:

<meta-data
     android:name="com.google.android.gms.vision.DEPENDENCIES"
     android:value="face" />

Java:

FaceDetector faceDetector = new
       FaceDetector.Builder(getApplicationContext()).setTrackingEnabled(false)
.build();
if(!faceDetector.isOperational()){
   //show error
  return;
  }
Frame frame = new Frame.Builder().setBitmap(myBitmap).build();
SparseArray<Face> faces = faceDetector.detect(frame);

Problem

The API seems to be unavailable on some devices, returning "false" when calling "isOperational ()".

• In Nexus 4 (Android 4.4.4) and Nexus 5 (Android 6.0.1) it does not work at all
• On Nexus 5x (Android 6.0.1) and Galaxy S4 (Android 5.0) it works great
• In LG G2 (Android 4.2.2), it worked only from the second sample launch.

What i found

I found some tips:

• On Github ( here ), other people also discovered this problem.

• ( "-", "PhotoViewerActivity.java" ) , , :

  if (!safeDetector.isOperational()) {
      // Note: The first time that an app using face API is installed on a device, GMS will
      // download a native library to the device in order to do detection.  Usually this
      // completes before the app is run for the first time.  But if that download has not yet
      // completed, then the above call will not detect any faces.
      //
      // isOperational() can be used to check if the required native library is currently
      // available.  The detector will automatically become operational once the library
      // download completes on device.
      Log.w(TAG, "Face detector dependencies are not yet available.");
  
      // Check for low storage.  If there is low storage, the native library will not be
      // downloaded, so detection will not become operational.
      IntentFilter lowstorageFilter = new IntentFilter(Intent.ACTION_DEVICE_STORAGE_LOW);
      boolean hasLowStorage = registerReceiver(null, lowstorageFilter) != null;
  
      if (hasLowStorage) {
          Toast.makeText(this, R.string.low_storage_error, Toast.LENGTH_LONG).show();
          Log.w(TAG, getString(R.string.low_storage_error));
      }
  }
  

reset ( , , ), , , ( Nexus 5).

• , API? ?

• "isOperational" ?

• Nexus? -, ?

• / , ? , - ( ). try-catch (OutOfMemoryError) OOM?

Answer 1

, , Google :

GMSCore (v9), . :

• Mobile Vision - . , - . Mobile Vision , .
• , Mobile Vision, FaceDetector.isOperational() BarcodeDetector.isOperational() - .

Answer 2

. , , :

• Google Play
• ​​ Google Play Services 8.7.xx apkmirror.
• ( , )
• , google play.
• .....

.

PS: , Google Play Services. , .