センサーからの値を改行させずに復帰させる

java
1import android.app.Activity;
2import android.content.Context;
3import android.hardware.Sensor;
4import android.hardware.SensorEvent;
5import android.hardware.SensorEventListener;
6import android.hardware.SensorManager;
7import android.os.AsyncTask;
8import android.os.Bundle;
9import android.view.SurfaceHolder;
10import java.io.BufferedWriter;
11import java.io.IOException;
12import java.io.OutputStream;
13import java.io.OutputStreamWriter;
14import java.net.Socket;
15import java.util.List;
16
17
18public class MainActivity extends Activity
19        implements SensorEventListener, SurfaceHolder.Callback{
20
21    SensorManager mSensorManager;
22    Sensor mAccSensor;
23
24    float mVX;
25    float mVY;
26   // float mVZ;
27    
28    @Override
29    protected void onCreate(Bundle savedInstanceState) {
30        super.onCreate(savedInstanceState);
31        setContentView(R.layout.activity_main);
32
33        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
34        mAccSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
35    }
36
37    @Override
38    protected void onStop() {
39        super.onStop();
40        mSensorManager.unregisterListener(this);
41    }
42
43    @Override
44    protected void onResume() {
45        super.onResume();
46        List<Sensor> sensors = mSensorManager.getSensorList(Sensor.TYPE_GYROSCOPE);
47        if(sensors.size() > 0) {
48            Sensor s = sensors.get(0);
49            mSensorManager.registerListener(this, s, SensorManager.SENSOR_DELAY_UI);
50        }
51    }
52
53    public void connect(final String str) {
54        new AsyncTask<Void, Void, String>() {
55
56
57            @Override
58            protected String doInBackground(Void... voids) {
59                try {
60
61                    Socket socket = new Socket("10.0.33.13",4000);
62                    OutputStream os = socket.getOutputStream();
63
64                    BufferedWriter bufwriter
65                            = new BufferedWriter(new OutputStreamWriter( os ) );
66                    bufwriter.write(str );
67                    //bufwriter.flush();
68
69                    bufwriter.close();
70                    socket.close();
71
72                } catch (IOException e) {
73                    e.printStackTrace();
74                }
75                return null;
76            }
77        }.execute();
78    }
79
80    @Override
81    public void onSensorChanged(SensorEvent event) {
82        if(event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
83
84
85            float y = event.values[1];
86            float x = event.values[2];
87            //float z = event.values[3];
88
89            mVX = mVX + x;
90            mVY = mVY + y;
91            //mVZ = mVZ + z;
92
93
94            String str = "X:" + mVX
95                    +  "Y:" + mVY ;
96
97            connect(str);
98        }
99    }
100
101    @Override
102    public void onAccuracyChanged(Sensor sensor, int accuracy) {//使わない
103    }
104
105    @Override
106    public void surfaceCreated(SurfaceHolder holder) {
107        registerSensor();
108    }
109
110    public void registerSensor() {
111        mSensorManager.registerListener(this, mAccSensor, SensorManager.SENSOR_DELAY_GAME);
112    }
113
114    @Override
115    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
116
117        mVX = 0;
118        mVY = 0;
119       // mVZ = 0;
120    }
121
122    @Override
123    public void surfaceDestroyed(SurfaceHolder holder) {
124
125        mSensorManager.unregisterListener(this);
126    }
127}
128

センサーから読み取った値をconnect()でサーバー側に送信し、サーバー側のターミナルで連続して表示することはできたのですが、ターミナルに改行せずに行頭に戻る命令を送る方法がわかりません。
サーバー側のプログラムに System.out.println(reader.readLine() + "\r");と書いても改行されるのですがどうすればいいでしょうか？