Fixed android samples build

samples/android/15-puzzle/src/org/opencv/samples/puzzle15/Puzzle15Processor.java

@@ -6,6 +6,7 @@ import org.opencv.core.Mat;
 import org.opencv.core.Scalar;
 import org.opencv.core.Size;
 import org.opencv.core.Point;
+import org.opencv.imgproc.Imgproc;
 
 import android.util.Log;
 

samples/android/camera-calibration/src/org/opencv/samples/cameracalibration/CameraCalibrator.java

@@ -13,6 +13,7 @@ import org.opencv.core.MatOfPoint3f;
 import org.opencv.core.Point;
 import org.opencv.core.Scalar;
 import org.opencv.core.Size;
+import org.opencv.imgproc.Imgproc;
 
 import android.util.Log;
 

samples/android/color-blob-detection/src/org/opencv/samples/colorblobdetect/ColorBlobDetectionActivity.java

@@ -174,7 +174,7 @@ public class ColorBlobDetectionActivity extends Activity implements OnTouchListe
             mDetector.process(mRgba);
             List<MatOfPoint> contours = mDetector.getContours();
             Log.e(TAG, "Contours count: " + contours.size());
-            Core.drawContours(mRgba, contours, -1, CONTOUR_COLOR);
+            Imgproc.drawContours(mRgba, contours, -1, CONTOUR_COLOR);
 
             Mat colorLabel = mRgba.submat(4, 68, 4, 68);
             colorLabel.setTo(mBlobColorRgba);

samples/android/face-detection/src/org/opencv/samples/facedetect/FdActivity.java

@@ -18,6 +18,7 @@ import org.opencv.core.Size;
 import org.opencv.android.CameraBridgeViewBase;
 import org.opencv.android.CameraBridgeViewBase.CvCameraViewListener2;
 import org.opencv.objdetect.CascadeClassifier;
+import org.opencv.imgproc.Imgproc;
 
 import android.app.Activity;
 import android.content.Context;