在android上通过蓝牙接收数据包

Question

我对arduino和android领域都很陌生。我使用arduino通过蓝牙模块向android发送数据(linvor JY-MCU v.1.05)。它与我的应用程序通信非常完美，但我无法接收到这个特定应用程序的任何数据。我正在从arduino =>转一个包裹($ 43，56！)我想要提取它，并在android应用程序上单独显示数字。在这里$-header, 43-hr value, 56-temp value, !-footer

我的arduino代码如下所示：

  #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代码也是一个检查蓝牙连接性的庞大代码。所以我把它限制在一个部分。有谁能帮我把这两组数字分别用两个txtView1和txtView2显示出来吗？

    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;
}
  */
            }
      }
        }
   }

快来人帮帮我。我已经忍受了一个多星期的痛苦。提前感谢你。桑杰

"Case接收“和"Run”是必须进行更改的循环。查找字符"indexOf()“的索引将提供一个错误(字符串索引超出绑定范围)。我也试过在进入箱子后关掉蓝牙，但是没有成功。希望能找到解决办法。

Answer 1

信息包含了什么？使用

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);

你总是提取相同的数据。考虑到在obj中包含了$和!之间的字符，那么您可以读取所有消息。

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

然后提取所有的线

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

如果在obj中有一些byte[]，那么必须将它们添加到缓冲区中，然后删除所有字节直到$，添加byte[]直到找到!，从缓冲区中提取和删除两个数据之间的数据，包括在内，并按我前面说的做。(好吧，这只是一个解决方案)

Answer 2

现在我一开始就没有用过蓝牙，但我想说的是，问题就在这几条线上：

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

mySerial.println(23);

mySerial.println(546);

mySerial.println("!");

因为您使用println()，所以在每一行都将消息作为单独的数据包发送，因此接收端不能将其拆分并使用信息。

我也遇到了类似的问题，只需将所需的所有数据放在一个字符串中，然后将整个字符串发送一次，就可以解决这个问题。

由于某种原因，arduino编码语言也无法将整数和字符串连接到另一个字符串，就像这样，我花了一段时间才弄清楚，但您只需使用类似于以下代码的行：

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