public class MainActivity extends Activity {    private EditText studentno;    private ServiceConnection conn = new StudentServiceConnection();    private IStundent iStundent;    private TextView resultView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                resultView = (TextView) this.findViewById(R.id.resultView);        studentno = (EditText) this.findViewById(R.id.studentno);        Button button = (Button) this.findViewById(R.id.button);        button.setOnClickListener(new ButtonClickListener());        Intent service = new Intent(this, StudentService.class);        bindService(service, conn, BIND_AUTO_CREATE);    }        private class StudentServiceConnection implements ServiceConnection{        public void onServiceConnected(ComponentName name, IBinder service) {            iStundent = (IStundent)service;        }        public void onServiceDisconnected(ComponentName name) {            iStundent = null;        }    }        @Override    protected void onDestroy() {        unbindService(conn);        super.onDestroy();    }    private final class ButtonClickListener implements View.OnClickListener{        public void onClick(View v) {            String no = studentno.getText().toString();            String name = iStundent.queryStudent(Integer.valueOf(no));            resultView.setText(name);        }    }}

public class StudentService extends Service{    private String[] names = {"张飞","李小龙","赵薇"};    private IBinder binder = new StundentBinder();        public String query(int no){        if(no>0 && no<4){            return names[no - 1];        }        return null;    }        @Override    public IBinder onBind(Intent intent) {        return binder;    }        private class StundentBinder extends Binder implements IStundent{        public String queryStudent(int no) {            return query(no);        }    }}

public interface IStundent {    public String queryStudent(int no);}