@J_Silva @jay_m The post was flagged by the community. It seems that the rule is, not to paste full codes at least on topics tagged as homework. I respect that, but in the case of Android-related topics, I disagree because there is no Processing for Android documentation teaching to code programmatically. Something necessary, because it would be difficult to implement an XML file structure. The problem is, that for building apps, instead of using P4A in conjunction with the Arduino IDE (which were born to live together); P4A has totally lost the battle against software like “MIT App Inventor” because documentation and handling seem much more simple. And that’s really a pity. Further, I don’t believe that a teacher will use A4P for actually teaching Android. So I believe that this rule in this case has a negative effect. This is why I decided to make a Github repo with some ready code, and you can find the code in question there.