Android : How to convert a image into base64Binary ?

imageView.buildDrawingCache();
Bitmap bitmap = profile_image.getDrawingCache();
String encodedImageData = getEncoded64ImageStringFromBitmap(bitmap);

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public String getEncoded64ImageStringFromBitmap(Bitmap bitmap) {
ByteArrayOutputStream stream = new ByteArrayOutputStream();
bitmap.compress(CompressFormat.JPEG, 70, stream);
byte[] byteFormat = stream.toByteArray();
// get the base 64 string
String imgString = Base64.encodeToString(byteFormat, Base64.NO_WRAP);

return imgString;
}