Use this function to check if a permission is granted to perform a specific operation. The permissions are idenfified with the string constants declared in the Manifest.permission package:
void setup() {
requestPermission("android.permission.ACCESS_FINE_LOCATION");
}
void draw() {
if (hasPermission("android.permission.ACCESS_FINE_LOCATION")) {
text("Location is available", width/2, height/2);
} else {
println("No permission to read location", width/2, height/2);
}
}