No grammar constraints (DTD or XML schema) detected for the document (Android)
For me it was a Problem with character encoding and unix filemode running eclipse on Windows:
Just marked the complete code, cutted and pasted it back (in short: CtrlA-CtrlX-CtrlV) and everything was fine - no more "No grammar constraints..." warnings
I retrieve a solution from a bug issue :
- Click Window > Preferences > XML > XML Files > Validation
- Change the setting 'validating files'>'No grammar specified' from warning to ignore.
- Re-validate your project. No more warnings now.
It works for me.
Be careful, my solution is a kind of "I do not understand so that I prefer to deactivate"...
Solution For Eclipse:
add <!DOCTYPE something> to the begining of each problematic XML,
after the xml tag <?xml version="1.0" encoding="utf-8"?>
you can write anything for doctype, but basically it's supposed to be manifest, activity, etc. from what I understand