How to count number of coins in android opencv ?

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Here is my code but i am not able to count the coins..

Bitmap i = getBitmap(imgPath + "mmsqqq.jpg");

    //Log.i("after Bitmap i",""+imgPath);
    Bitmap bmpImg = i.copy(Bitmap.Config.ARGB_8888, false);
    //Log.i("after Bitmap bmpImg",""+imgPath);
    Mat srcMat = new Mat ( bmpImg.getHeight(), bmpImg.getWidth(), CvType.CV_8UC3);
    Bitmap myBitmap32 = bmpImg.copy(Bitmap.Config.ARGB_8888, true);
    Utils.bitmapToMat(bmpImg, srcMat);


    //convert to gray scale and save image
    Mat gray = new Mat(srcMat.size(), CvType.CV_8UC1);
    //Imgproc.cvtColor(srcMat, gray, Imgproc.COLOR_RGB2GRAY,4);
    Imgproc.cvtColor(srcMat, gray, Imgproc.COLOR_BGRA2GRAY);
    //write bitmap
    Boolean grayBool = Highgui.imwrite(imgPath + "gray.jpg", gray);
    //Toast.makeText(this, "Gray scale image saved!", Toast.LENGTH_SHORT).show();

    //thresholding
    Mat threshed = new Mat(bmpImg.getWidth(),bmpImg.getHeight(), CvType.CV_8UC1);
    Imgproc.adaptiveThreshold(gray, threshed, 255, Imgproc.ADAPTIVE_THRESH_MEAN_C, Imgproc.THRESH_BINARY, 75, 5);//15, 8 were original tests. Casey was 75,10
    //Imgproc.adaptiveThreshold(threshed, threshed, 255, Imgproc.ADAPTIVE_THRESH_MEAN_C, Imgproc.THRESH_BINARY_INV, 75, 5);
    Core.bitwise_not(threshed, threshed);
    Utils.matToBitmap(threshed, bmpImg);
    //write bitmap
    Boolean boolThr = Highgui.imwrite(imgPath + "threshed.jpg", threshed);
    //Toast.makeText(this, "Thresholded image saved!", Toast.LENGTH_SHORT).show();


    //perform Canny Edge Detection and convert to 4 channel
    Mat edge = new Mat();
    Mat dst = new Mat();
    Imgproc.Canny(threshed, edge, 80, 90);
    Imgproc.cvtColor(edge, dst, Imgproc.COLOR_GRAY2RGBA,4);
    //convert to bitmap
    Bitmap resultBitmap = Bitmap.createBitmap(dst.cols(), dst.rows(),Bitmap.Config.ARGB_8888);           
    Utils.matToBitmap(dst, resultBitmap);
    //write bitmap
    Boolean bool = Highgui.imwrite(imgPath + "edges.jpg", dst);
    //Toast.makeText(this, "Edge information image saved!", Toast.LENGTH_SHORT).show();


    //smoothing
    Mat smoothed = new Mat(bmpImg.getWidth(),bmpImg.getHeight(), CvType.CV_8UC1);
    Imgproc.GaussianBlur(dst, smoothed, new org.opencv.core.Size(3,3), 50);
    Utils.matToBitmap(smoothed, bmpImg);
    //write bitmap
    Boolean boolSmoothed = Highgui.imwrite(imgPath + "smoothed.jpg", smoothed);
    //Toast.makeText(this, "Smoothed image saved!", Toast.LENGTH_SHORT).show();

    //morphological operations
    //dilation
    Mat dilated = new Mat(bmpImg.getWidth(),bmpImg.getHeight(), CvType.CV_8UC1);
    Imgproc.dilate(smoothed, dilated, Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, new org.opencv.core.Size (16, 16)));
    Utils.matToBitmap(dilated, bmpImg);
    //write bitmap
    Boolean boolDilated = Highgui.imwrite(imgPath + "dilated.jpg", dilated);
    //Toast.makeText(this, "Dilated image saved!", Toast.LENGTH_SHORT).show();

    //erosion
    Mat eroded = new Mat(bmpImg.getWidth(),bmpImg.getHeight(), CvType.CV_8UC1);
    Imgproc.erode(dilated, eroded, Imgproc.getStructuringElement(Imgproc.MORPH_ELLIPSE, new org.opencv.core.Size(15, 15)));
    Utils.matToBitmap(eroded, bmpImg);
    //write bitmap
    Boolean boolEroded = Highgui.imwrite(imgPath + "eroded.jpg", eroded);
    //Toast.makeText(this, "Eroded image saved!", Toast.LENGTH_SHORT).show();


    //hough circles
    Mat circles = new Mat();

    // parameters
    int iCannyUpperThreshold = 100;
    int iMinRadius = 20;
    int iMaxRadius = 100;
    int iAccumulator = 100;

    Imgproc.HoughCircles(eroded,circles,Imgproc.CV_HOUGH_GRADIENT,1.0, eroded.rows()/8,iCannyUpperThreshold,iAccumulator,iMinRadius,iMaxRadius);
    Log.i("cccccccccccccccccccccc","cccc"+circles.cols());      
    // draw
    if (circles.cols() > 0)
    {           
        //Toast.makeText(this, "Coins : " +circles.cols() , Toast.LENGTH_LONG).show();
        alertString = "Number of coins detected : " + circles.cols();
        displayAlert(alertString);
    }
    else
    {
        //Toast.makeText(this, "No coins found", Toast.LENGTH_LONG).show();
        alertString = "No objects detected";
        displayAlert(alertString);
    }

Help me to solve this problem. Thank You.