使用FaceDetector Google-vision检测到脸部时拍照

Question

I found the demo code here: https://github.com/googlesamples/android-vision/blob/master/visionSamples/FaceTracker/app/src/main/java/com/google/android/gms/samples/vision/face/facetracker/FaceTrackerActivity.java

and my question is how to take picture when face detected and save it to device, and when we take 1st picture next picture will be take after 5s when face detected because we can't save to many picture to device.

Answer 1

You have to add FaceDetectionListener in camera API then call startFaceDetection() method,

CameraFaceDetectionListener fDListener = new CameraFaceDetectionListener();
mCamera.setFaceDetectionListener(fDetectionListener);
mCamera.startFaceDetection();

Implement Camera.FaceDetectionListener, you receive the detected face in onFaceDetection override method,

private class MyFaceDetectionListener 
          implements Camera.FaceDetectionListener {

@Override
public void onFaceDetection(Face[] faces, Camera camera) {

    if (faces.length == 0) {
        Log.i(TAG, "No faces detected");
    } else if (faces.length > 0) {
        Log.i(TAG, "Faces Detected = " + 
              String.valueOf(faces.length));

        public List<Rect> faceRects;
        faceRects = new ArrayList<Rect>();

        for (int i=0; i<faces.length; i++) {
            int left = faces[i].rect.left;
            int right = faces[i].rect.right;
            int top = faces[i].rect.top;
            int bottom = faces[i].rect.bottom;
            Rect uRect = new Rect(left0, top0, right0, bottom0);
            faceRects.add(uRect);
        }

        // add function to draw rects on view/surface/canvas
    }
}

As per your case, new Handler().postDelayed(new Runnable,long seconds) take 2nd picture inside runnable after 5 seconds. Please let me know if you have any queries.