Run certain code only when in Android Mode

stefanix

How do people run code that is only relevant when running on a phone?

For example I want my sketch look the same in Java and in Android mode. For this I have to use a strokeWeight that is proportional to displayDensity. Problem is the this variable is only available in Android mode. Similarly I only want to call size(width, height) in Java mode.

I can check for Android ...

if (System.getProperty("java.vendor") == "The Android Project") { strokeWeight(3*displayDensity) }

... but this will not compile because Java. In Javascript/Python this would just work because lazy evaluation and in C++ this could be done with #defines.

How do you do that in Processing/Java. Anybody knows a trick to make it work? Reflection module (looks crazy verbose)?

Let me know, Best,

stefanix

Ok, figured it out, semi-elegantly ...

I am using the settings method so I can run code before size():

void settings() {
  if (System.getProperty("java.vendor") == "The Android Project") {
    isAndroid = true;
  } else {
    isAndroid = false;
  }

  if (!isAndroid) {
    size(600,1000);
  }
}

Then in other locations I do:

  if (isAndroid) {
    strokeWeight(3*getValue("displayDensity"));
    // println(callMethodBoolean("hasPermission", "android.permission.ACCESS_FINE_LOCATION"));
  } else {
    strokeWeight(3);
  }

getValue is my method that uses Refection to access the field dynamically:

float getValue(String name) {
  float val = 0;
  try {
    val =  (float) this.getClass().getField(name).get(this);
  } catch (Exception e) {
    System.out.println(e);
  }
  return val;
}

I have some similar methods for doing dynamic method calls:

void callMethodVoid(String name) {
  try {
    this.getClass().getMethod(name, null).invoke(this);
  } catch(Exception e) {
    System.out.println(e);
  }
}

float callMethodFloat(String name) {
  float val = 0;
  try {
    val =  (float) this.getClass().getMethod(name, null).invoke(this);
  } catch(Exception e) {
    System.out.println(e);
  }
  return val;
}

boolean callMethodBoolean(String name, String arg) {
  boolean val = false;
  try {
    val =  (boolean) this.getClass().getMethod(name, String.class).invoke(this, arg);
  } catch(Exception e) {
    System.out.println(e);
  }
  return val;
}

erwrow

thanks for sharing your solution, i was searching for that kind of stuff for a long time