安卓人脸识别API

final int MAX_FACE = 1;
private FaceDetector faceDetector;
private FaceDetector.Face[] faces;
private Paint rectPaint = new Paint();

rectPaint.setAntiAlias(true);
rectPaint.setStrokeWidth(8);
rectPaint.setStyle(Paint.Style.STROKE);
rectPaint.setColor(Color.GREEN);

Bitmap必须为RGB_565色彩格式！如果不是，可以用下面的代码先转一下：
Bitmap bmp565 = bitmap.copy(Bitmap.Config.RGB_565, false);
private void detectFace(Bitmap bitmap) {
    Canvas canvas = new Canvas(bitmap);
    int n = faceDetector.findFaces(bitmap, faces);
    for (int i=0; i<n; i++) {
        FaceDetector.Face f = faces[i];
        PointF midPoint = new PointF();
        float dis = f.eyesDistance();
        f.getMidPoint(midPoint);
        int dd = (int)(dis);
        Point eyeLeft = new Point((int)(midPoint.x - dis/2), (int)midPoint.y);
        Point eyeRight = new Point((int)(midPoint.x + dis/2), (int)midPoint.y);
        faceRect = new Rect((int)(midPoint.x - dd), (int)(midPoint.y - dd), (int)(midPoint.x + dd), (int)(midPoint.y + dd));
        canvas.drawRect(faceRect, rectPaint);
    }
}