Question

我对arduino和android域都很新。我正在使用arduino使用蓝牙模块（linvor JY-MCU v.1.05）向android发送数据。它正在与我的应用程序完美通信，但我无法接收此特定应用程序的任何数据。我从arduino =＆gt;传输数据包（$ 43 56！）我想解压缩并在Android应用程序上单独显示数字。这里$-header, 43-hr value, 56-temp value, !-footer

我的arduino代码如下：

  #include <SoftwareSerial.h>


  SoftwareSerial mySerial(10, 11); // RX, TX
  String command = "";             // Stores response of bluetooth device
                           // which simply allows \n between each
                           // response.


  void setup() {
  mySerial.begin(9600); // initialization

  delay(25);
  }

  void loop() 

  {
  mySerial.println("$-43:56^!");  // print   message


  delay(5000);
  }

字符串就像一个数据包。我希望43显示在编辑框中，56显示在文本框中。

我的Android代码是一个非常庞大的代码，它也会检查蓝牙连接。所以我将它限制在一个部分。有人可以帮我解决它的编码部分，只分别在两个txtView1和txtView2中显示两组数字....

    package com.example.projtrial;

    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.lang.reflect.Method;
    import java.util.UUID;

    import com.example.projtrial.R;


    import android.R.string;
    import android.os.Bundle;
    import android.app.Activity;
    import android.bluetooth.BluetoothAdapter;
    import android.bluetooth.BluetoothDevice;
    import android.bluetooth.BluetoothSocket;
    import android.content.Intent;
    import android.os.Build;
    import android.view.Menu;
    import android.os.Handler;
    import android.util.Log;
    import android.view.View;
    import android.view.View.OnClickListener;
    import android.widget.Button;
    import android.widget.TextView;
    import android.widget.Toast;
    import android.widget.EditText;
    import java.util.regex.Pattern;
    import java.util.Arrays;
    import java.util.StringTokenizer;

    public class MainActivity extends Activity {
  private static final String TAG = "projtrial";

  public EditView editView1;
  public TextView textView1;
  Handler h;

final int RECEIVE_MESSAGE = 1;       //Handler status
private BluetoothAdapter btAdapter = null;
private BluetoothSocket btSocket = null;
private StringBuilder sb = new StringBuilder();

private ConnectedThread mConnectedThread;

//SPP UUID service
  private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-    00805F9B34FB");       
// MAC-address of Bluetooth module 
  private static String address = "20:13:05:13:01:98";

  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


editText1 = (EditText) findViewById(R.id.editText1);       
textView1 = (TextView) findViewById(R.id.textView1);

h = new Handler() {
    private String strIncom;
private String header;
    private String hr;
    private String tempr;
    private String footer;


public void handleMessage(android.os.Message msg) {

switch (msg.what) {
        case RECEIVE_MESSAGE:   // If one receives a message                                

            byte[] readBuf = (byte[]) msg.obj;
            String header = new String(readBuf, 0, msg.arg1);

            String[] separated = message.split("\\:");
            editText1.setText("hr: " + separated[0]);  //works
            textView1.setText("temp:" + separated[1]); //doesnt work
               }
            break;    
    }

};

};


btAdapter = BluetoothAdapter.getDefaultAdapter();       // get Bluetooth adapter
checkBTState();

}
private BluetoothSocket createBluetoothSocket(BluetoothDevice device) throws        IOException {
    if(Build.VERSION.SDK_INT >= 10){
        try {
            final Method  m =   device.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class });
            return (BluetoothSocket) m.invoke(device, MY_UUID);
        } catch (Exception e) {
            Log.e(TAG, "Could not create Insecure RFComm Connection",e);
        }
    }
    return  device.createRfcommSocketToServiceRecord(MY_UUID);
}


@Override
public void onResume() {
  super.onResume();

  Log.d(TAG, "...onResume - try connect...");

  // Set up a pointer to the remote node using it's address.
  BluetoothDevice device = btAdapter.getRemoteDevice(address);

  // Two things are needed to make a connection:
  //   A MAC address, which we got above.
  //   A Service ID or UUID.  In this case we are using the
  //     UUID for SPP.

try {
    btSocket = createBluetoothSocket(device);
} catch (IOException e) {
    errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
}

  /*try {
    btSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
  } catch (IOException e) {
    errorExit("Fatal Error", "In onResume() and socket create failed: " + e.getMessage() + ".");
  }*/

  // Discovery is resource intensive.  Make sure it isn't going on
  // when you attempt to connect and pass your message.
  btAdapter.cancelDiscovery();

  // Establish the connection.  This will block until it connects.
  Log.d(TAG, "...Connecting...");
  try {
    btSocket.connect();
    Log.d(TAG, "....Connection ok...");
  } catch (IOException e) {
    try {
      btSocket.close();
    } catch (IOException e2) {
      errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
    }
  }

  // Create a data stream so we can talk to server.
  Log.d(TAG, "...Create Socket...");

  mConnectedThread = new ConnectedThread(btSocket);
  mConnectedThread.start();
}

@Override
public void onPause() {
  super.onPause();

  Log.d(TAG, "...In onPause()...");

  try     {
    btSocket.close();
  } catch (IOException e2) {
    errorExit("Fatal Error", "In onPause() and failed to close socket." + e2.getMessage() + ".");
  }
}

private void checkBTState() {
  // Check for Bluetooth support and then check to make sure it is turned on
  // Emulator doesn't support Bluetooth and will return null
  if(btAdapter==null) { 
    errorExit("Fatal Error", "Bluetooth not support");
  } else {
    if (btAdapter.isEnabled()) {
      Log.d(TAG, "...Bluetooth ON...");
    } else {
      //Prompt user to turn on Bluetooth
      Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
      startActivityForResult(enableBtIntent, 1);
    }
  }
}

private void errorExit(String title, String message){
  Toast.makeText(getBaseContext(), title + " - " + message, Toast.LENGTH_LONG).show();
  finish();
}

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

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

        // Get the input and output streams, using temp objects because
        // member streams are final
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) { }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }


  public void run() {
        byte[] buffer = new byte[256];  // buffer store for the stream
        int bytes; // bytes returned from read()

        // Keep listening to the InputStream until an exception occurs
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);        // Get number of bytes and message in "buffer"
              h.obtainMessage(RECEIVE_MESSAGE, bytes, -1, buffer).sendToTarget();       // Send to message queue Handler
            } catch (IOException e) {
                break;
            }
/*
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}
  */
            }
      }
        }
   }

有人请尽快帮助我。我被困扰了一个多星期了。提前感谢你。 Sanj

“案例接收”和“运行”是必须进行更改的循环。查找字符“indexOf（）”的索引会提供错误（字符串索引超出范围）。我也尝试在进入外壳接收模块后关闭蓝牙，但是徒劳无功。希望找到解决方案。

Answer 1

消息包含什么？与

byte[] readBuf = (byte[]) msg.obj;
String header = new String(readBuf, 0, msg.arg1);

所有连续

 byte[] readBuf2 = (byte[]) msg.obj; 
 String hr = new String(readBuf2, 0, msg.arg1);

你总是提供相同的数据。鉴于在obj中包含$和!之间的字符，您可以阅读所有消息

byte[] readBuf = (byte[]) msg.obj;
String message = new String(readBuf, 0, msg.arg1);

然后提取所有行

String[] cell = message.split("\n");
txtView1.setText("HR:" +cell[1]);
[...]

如果在obj中而不是有一些byte []，那么你必须将它们添加到缓冲区，然后删除所有字节直到$，添加byte []直到找到!，提取并从缓冲区中删除两个分隔符之间的数据，包括在内，并按照我之前说的做。（嗯，这只是一个解决方案）

Answer 2

现在我刚才没有使用蓝牙，但我会说问题可能出在这些问题上：

mySerial.println("$");  // print   message

mySerial.println(23);

mySerial.println(546);

mySerial.println("!");

因为你正在使用println（）;您将每行的消息作为单独的数据包发送，因此接收端无法将其拆分并使用该信息。

我遇到了类似的问题并通过简单地将所有数据放在一个字符串中并将整个字符串发送一次来修复它。

arduino编码语言也出于某种原因无法将整数和字符串连接到另一个字符串就像那样，我花了一段时间来弄清楚它，但你只需要使用与此类似的行：

String output = "$";
output += 23; //or "23", not sure if it matters which one you use.
output += 546;
output += "!";
mySerial.println(output);

在Android GUI通过蓝牙接收数据包

2 个答案: