Is this simple enough:
void setup() {
fullScreen();
background(209);
fill(0, 255, 0);
rect(200,200,400,400);
}
void draw() {
}
But don’t try to run this on the latest Processing version 4.4.4 because it no longer works in Android mode and is a known issue. Instead use version 4.3 to get it to work. In my opinion the user needs to use Android Studio and Processing in tandem. Android Studio mainly just helps in getting the right files in the right places. It’s more complicated than it needs to be but we’ve been told that it’s being worked on and I’m sure that it’s not easy from a developer standpoint. That said Processing with Android mode is still far easier to use than the alternative in my opinion and I would like to see a lot more future development in this area by our programmers. One of the problems is what to use for ‘widgets’. It’s fun to create your own but the good ones are created using official Android Developer code which is of course more complicated. There have been several published examples, eg GitHub - vsquared/AndroidWidgets_Processing4: Android controls for use in Processing 4.1.1 Android mode. Device is 10" Samsung tablet in landscape orientation.