somewhere in my Android activity:

new Button().setOnClickListener(
        new OnClickListener() {
            public void onClick(View v) {
              println(v.getId + "was clicked");
          }
        }

public interface OnClickListener(View v); //no method body defined

 or

public class MyAndroidAppActivity extends Activity implements OnClickListener {
new Button().setOnClickListener(this) //where this is the click

@Override // just a helpful annotation for the reader
public void onClick(View v) {
              println(v.getId + "was clicked");

}
}