how to resume the activity?

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http://stackoverflow.com – i have 3 classes A,B,C Class A am passing 3 values to class B and class B am passing 3 values to class C. In class C i have one back button if i click this back button i want to resume my activity B pls check my code pls post the updated code bacause i am new for android i don't know much about activity life cycle pls past the correct code for this.Thank in advance. This is my code. public class A extends Activity { EditText one,two,three;Button sub; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setRequestedOrientation(Activi (HowTos)