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/**
 * Get file from Drawable
 * @param bitmap bitmap image
 * @return byte array
 */
private byte[] getFileDataFromDrawable(Bitmap bitmap) {
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 0, byteArrayOutputStream);
    return byteArrayOutputStream.toByteArray();
}