receive value from canvas of java

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http://stackoverflow.com – for receive a value from some variables from another java I used return. but my another java is focus on canvas programming. I want to send new value from canvas to my activity after user drawing on screen but i just can send a value before user draw something. what should I do to send the newest value? I will appreciate your help.. :) Activity Java public class ExerciseAnim extends Activity { CustomDrawableView mCustomDrawableView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setFlags(WindowManager. (HowTos)