If you cannot afford a paid license for Bhasha Bharti, there are excellent free alternatives that are Unicode compliant and safe to use.
You cannot easily install system-wide fonts on stock Android, but you can use it in specific apps: bhasha bharti title two gujarati fonts free patched
If you are looking for free, high-quality Gujarati fonts that don't require specific patches, consider these options from Google Fonts : If you cannot afford a paid license for