Android OutputStream.write组合了多条消息

Question

我有一辆arduino汽车，我希望通过蓝牙从我的Android手机控制。我已经为此创建了一个应用程序，但是当我尝试通过我的OutputStream.write函数发送多个连续消息时，它们将作为单个连续消息发送。例如：如果我调用connectedThread.write（＆＃34; 200-100＆＃34;）;然后在我的串行监视器上connectThread.write（＆＃34; 300-150＆＃34;）显示为单个消息：＆＃34; 200-100300-150＆＃34;。我在其他StackOverflow帖子（OutputStream.write() never ends，Android outputStream.write send multiple messages）中看到了同样的问题，但他们没有一个适合我的答案，我尝试使用connectedThread.flush（）并且它没有＆ ＃39; t帮助。这是我的代码（连接部分在另一个Activity中，它工作正常）：

package com.clickau.cosmin.bluetootharduinocarcontroller;

import android.bluetooth.BluetoothSocket;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.SeekBar;
import android.widget.Toast;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Controls extends AppCompatActivity {

    private SeekBar speed;
    private SeekBar direction;
    private BluetoothSocket btSocket = DataHolder.getData();
    private ConnectedThread connectedThread;

    private int speedValue;
    private int directionValue;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_controls);

        speed = (SeekBar) findViewById(R.id.speed);
        direction = (SeekBar) findViewById(R.id.direction);
        speedValue = speed.getProgress();
        directionValue = direction.getProgress();

        speed.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser)
            {
                speedValue = speed.getProgress()/5;
                speedValue*=5;
                directionValue = direction.getProgress()/5;
                directionValue*=5;
                /*StringBuilder str = new StringBuilder();
                if (speedValue == 255)
                    str.append("STOP");
                else
                {
                    if (speedValue > 255)
                    {
                        str.append(speedValue - 255);
                        str.append('F');
                    }
                    else if (speedValue < 255)
                    {
                        str.append(255-speedValue);
                        str.append('S');
                    }

                    if (directionValue > 100)
                    {
                        str.append('D');
                        str.append(directionValue-100);
                    }
                    else if (directionValue < 100)
                    {
                        str.append('S');
                        str.append(100 - directionValue);
                    }
                }
                str.append('\n');
                connectedThread.write(str.toString());*/
                connectedThread.write(speedValue+ "+" + directionValue);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {

            }


            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {
                speed.setProgress(255);
                speedValue = speed.getProgress();
            }

        });

        direction.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progressValue, boolean fromUser)
            {
                speedValue = speed.getProgress()/5;
                speedValue*=5;
                directionValue = direction.getProgress()/5;
                directionValue*=5;
                /*StringBuilder str = new StringBuilder();
                if (speedValue == 255)
                    str.append("STOP");
                else
                {
                    if (speedValue > 255)
                    {
                        str.append(speedValue - 255);
                        str.append('F');
                    }
                    else if (speedValue < 255)
                    {
                        str.append(255-speedValue);
                        str.append('S');
                    }

                    if (directionValue > 100)
                    {
                        str.append('D');
                        str.append(directionValue-100);
                    }
                    else if (directionValue < 100)
                    {
                        str.append('S');
                        str.append(100 - directionValue);
                    }
                }
                str.append('\n');
                connectedThread.write(str.toString());*/
                connectedThread.write(speedValue+ "+" + directionValue);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar)
            {

            }


            @Override
            public void onStopTrackingTouch(SeekBar seekBar)
            {
                direction.setProgress(100);
                directionValue = direction.getProgress();
            }

        });






        connectedThread = new ConnectedThread(btSocket);
        connectedThread.start();

    }

    private class ConnectedThread extends Thread
    {
        private final InputStream mmInStream;
        private final OutputStream mmOutStream;

        public ConnectedThread(BluetoothSocket socket)
        {
            InputStream tmpIn = null;
            OutputStream tmpOut = null;

            try{
                tmpIn = socket.getInputStream();
                tmpOut = socket.getOutputStream();
            }catch(IOException e) {
                Log.e("ERROR", "Connected Thread");
            }

            mmInStream = tmpIn;
            mmOutStream = tmpOut;
        }

        /*public void run()
        {
            byte[] buffer = new byte[256];
            int bytes;

            while (true)
            {
                try{
                    bytes = mmInStream.read(buffer);
                    String readMessage = new String(buffer, 0, bytes);
                    bluetoothIn.obtainMessage(handlerState, bytes, -1 ,readMessage).sendToTarget();
                } catch (IOException e)
                {
                    break;
                }
            }
        }*/

        public void write(String input)
        {
            byte[] msgBuffer = input.getBytes();
            try{
                mmOutStream.write(msgBuffer);
                mmOutStream.flush();
            }catch(IOException e)
            {
                Toast.makeText(getBaseContext(), "Connection Failure", Toast.LENGTH_LONG).show();
                finish();
            }

        }

    }


}

我认为这可能是对蓝牙的优化，但它真的很烦人，因为我需要在移动控件时发送这些消息，而不是10秒后发送。有谁知道如何解决这个问题？