<service android:name=".FirstService"></service>

class StartServiceListener implements OnClickListener {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(TestActivity.this, FirstService.class);
startService(intent);
}
}
class StopServiceListener implements OnClickListener {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setClass(TestActivity.this, FirstService.class);
stopService(intent);
}
}