Encode image to base64 in Android, JAVA

Uri selectedImage = data.getData();
String[] filePathColumn = {MediaStore.Images.Media.DATA};
Cursor cursor = getActivity().getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String imagePath = cursor.getString(columnIndex);

private String convertToBase64(String imagePath)
{
    Bitmap bm = BitmapFactory.decodeFile(imagePath);
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bm.compress(Bitmap.CompressFormat.JPEG, 100, baos);
    byte[] byteArrayImage = baos.toByteArray();
    String encodedImage = Base64.encodeToString(byteArrayImage, Base64.DEFAULT);
    return encodedImage;
}