Note: I found this tool somewhere in xda and I am not the developer of this tool. I don't the name of the developer of this tool.
How to use?
1. Download and extract ACC.zip
2. Run ACC.
3. Paste the HEX color code in the HEX Tab.
4. Press the convert button.
5. It will automatically convert the hex color code into smali color code.
6. Copy the smali color code to your smali file.
Download it from here.
The developer of this tool (don't know his/her name)