My question is specifically for Germany, but in case you know the procedures of other EU countries or Canada and you can answer to this question for those countries you're welcome to share your knowledge.
To get a work visa in Germany, there is a requirement that asks for proof of qualification. Can one meet this requirement with Associate Android Developer Certification by Google for Android developer jobs?
To apply to have your qualifications recognised in Germany contact the Bundesagentur für Arbeit (BA, the Federal Employment Agency).
https://www.arbeitsagentur.de/en/recognition-of-qualifications
Vocational training and certificates in either IT or other fields are not sufficient to qualify for a work and residency permit under the EU Bluecard skilled workers program.
That requires the equivalent of a German higher education degree.
http://www.bamf.de/EN/Infothek/FragenAntworten/BlaueKarteEU/blaue-karte-eu-node.html
If instead you are pursuing a normal residency permit with associated work permit you need to have a confirmed job offer. As far as I know the job offer will be the most important part of that application for getting consent from the Bundesagentur für Arbeit (BA, the Federal Employment Agency).
As far as I’m aware software development is not a profession that is protected with specific entry requirements with regards to training and certification (unlike for instance what a medical doctor would need to have to practice medicine).
Vocational training and certificates relevant to that job offer, as well as work experience will certainly support your application, but may not even be required at all.
A certificate of training from a course run by the official developers usually carries significant weight where employability is concerned.
This should be enough to count as proof of your competency, but if you have any extra Java related certificates (does not have to be Android), that can also help your case.
