protected void saveTodo() {
	String imageString = null;
	if (mImageUrl != null && !mImageUrl.equals("")) {
		try {
		Cursor cursor = getContentResolver().query(mImageUrl, null,
				null, null, null);
		cursor.moveToFirst();

		int index = cursor
				.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
		String absoluteFilePath = cursor.getString(index);
		FileInputStream fis = new FileInputStream(absoluteFilePath);

		int bytesRead = 0;
		ByteArrayOutputStream bos = new ByteArrayOutputStream();
		byte[] b = new byte[1024];
		while ((bytesRead = fis.read(b)) != -1) {
			bos.write(b, 0, bytesRead);
		}
		byte[] bytes = bos.toByteArray();
		imageString = Base64.encodeToString(bytes, Base64.DEFAULT);
		} catch (Exception ex) {
			ex.printStackTrace();
		}
	}
	new SaveTodoTask(this).execute(mTxtTodoText.getText().toString(), imageString);
}