service与activity交互的方式有多种，这里说说使用Messenger来实现两者之间的交互。

Service程序

public class MessengerService extends Service {

    final Messenger mMessenger = new Messenger(new IncomingHandler());

    @Override

    public IBinder onBind(Intent intent) {

        return mMessenger.getBinder();

    }

    @SuppressLint("HandlerLeak")

    class IncomingHandler extends Handler {

        @Override

        public void handleMessage(Message msg) {

            switch (msg.what) {

            case 0:

                Toast.makeText(MessengerService.this,"Hello lenve!", Toast.LENGTH_LONG).show();

                break;

            case 1:

                Toast.makeText(MessengerService.this,"Hello lenve!Hello world!", Toast.LENGTH_LONG).show();

                break;

            default:

                break;

            }

        }

    }

}

MainActivity.java

public class MainActivity extends Activity {

    private Messenger mMessenger;

    private ServiceConnection conn;

    private Intent intent;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        intent = new Intent(this,MessengerService.class);

        conn = new ServiceConnection() {

            @Override

            public void onServiceDisconnected(ComponentName name) {

                mMessenger = null;

            }

            @Override

            public void onServiceConnected(ComponentName name, IBinder service) {

                mMessenger = new Messenger(service);

            }

        };

    }

    @Override

    protected void onStart() {

        super.onStart();

        bindService(intent, conn, BIND_AUTO_CREATE);

    }

    @Override

    protected void onStop() {

        super.onStop();

        unbindService(conn);

    }

    public void onClick(View v){

        Message msg = null;

        switch (v.getId()) {

        case R.id.button1:

            msg = Message.obtain(null, 0, 0, 0);

            try {

                mMessenger.send(msg);

            } catch (RemoteException e) {

                e.printStackTrace();

            }

            break;

        case R.id.Button01:

            msg = Message.obtain(null, 1, 0, 0);

            try {

                mMessenger.send(msg);

            } catch (RemoteException e) {

                e.printStackTrace();

            }

            break;

        default:

            break;

        }

    }

}

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