Crop Image

/**
   * Crop a image taking a recerence a view parent like a frame, and a view child like final
   * reference
   *
   * @param bitmap image to crop
   * @param frame where the image is set it
   * @param reference frame to take reference for crop the image
   * @return image already cropped
   */
  public static byte[] cropImage(Bitmap bitmap, View frame, View reference){
    int heightOriginal = frame.getHeight();
    int widthOriginal = frame.getWidth();

    int heightFrame = reference.getHeight();
    int widthFrame = reference.getWidth();
    int leftFrame = reference.getLeft();
    int topFrame = reference.getTop();

    int heightReal = bitmap.getHeight();
    int widthReal = bitmap.getWidth();

    int widthFinal = (widthFrame * widthReal)/widthOriginal;
    int heightFinal = (heightFrame * heightReal)/heightOriginal;
    int leftFinal = (leftFrame * widthReal)/widthOriginal;
    int topFinal = (topFrame * heightReal)/heightOriginal;

    Bitmap bitmapfinal = Bitmap.createBitmap(bitmap,
        leftFinal, topFinal, widthFinal, heightFinal);

    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmapfinal.compress(Bitmap.CompressFormat.JPEG, 100, stream);//100 is the best quality possibe
    return stream.toByteArray();
  }