How to implement Interface in android

   When we implements an interface in a class, its abstract methods are implemented in the  class.Lets see the example.

First we created an interface ApplicationInterface 
ApplicationInterface .java

public interface ApplicationInterface {
 public void activityStarted();
 public void activityAborted();
 public void activityStopped();
 public void activityDone();
}

public class MainActivity extends Activity implements ApplicationInterface {

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
 }

 // these are the methods implemented using interface
 @Override
 public void activityStarted() {
  // TODO Auto-generated method stub
 }

 @Override
 public void activityAborted() {
  // TODO Auto-generated method stub
 }

 @Override
 public void activityStopped() {
  // TODO Auto-generated method stub
 }

 @Override
 public void activityDone() {
  // TODO Auto-generated method stub

 }

}