Running your sketch in the Android Emulator

Now that you've installed the Android SDK, it's time to get your hands dirty and write some code. We'll start by writing a simple sketch and run it inside the Android Emulator. If you don't have access to an Android device, the emulator is a great application to test your apps.

How to do it...

The code for this app is very straightforward. It leaves a trace of colored circles across the screen. You'll notice that the size() function looks a little different. We don't set the dimensions of the sketch window in pixels, as we don't know the screen resolution of the device that our app will run on.

float x;
float y;
float prevX;
float prevY;
float d;
float h;
  
void setup()
{
  size( displayWidth, displayHeight );
  background( 0 );
  smooth();
  
  x = random( width );
  y = random( height );
  prevX = x;
  prevY = y;

  stroke( 255, 128 );

  colorMode( HSB, 360, 100, 100, 100 );
}

void draw()
{
  x += random( -30, 30 );
  y += random( -30, 30 );...