arduinoからアンドロイドにBluetoothデータを受信するにはどうすればよいですか？

Question

私はarduinoに接続された温度センサーを使用して、私の携帯電話にブルートゥースを介して温度情報を送信します。私の電話アプリケーションには完全なUIがあり、情報を受け取る準備ができています。

私が見ているすべてのチュートリアルは、Bluetoothペアリングを行うために使用されています。私はこの部分をまだしていません（arduinoのコードはまだ完成していないのでテストできません）。しかし、私は電話のオプションを使ってペアリングを行うと仮定しても、データ伝送の仕方はまだ分かりません。

電話で情報を受信して​​表示するにはどうすればよいですか？誰でもチュートリアルや説明/コードを教えてもらえますか？

ありがとうございます！

Answer 1

これを見て、非常に効果的です。このコードでは、ファイルごとにMACアドレスを取得し、デバイスに自動的に接続します。その後、Arduinoから文字列データを送受信できます。このコードのインスピレーションを受けることができます。

import android.annotation.SuppressLint; 
import android.annotation.TargetApi; 
import android.app.Activity; 
import android.app.AlertDialog; 
import android.app.Dialog; 
import android.bluetooth.BluetoothAdapter; 
import android.bluetooth.BluetoothDevice; 
import android.bluetooth.BluetoothSocket; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.ActivityInfo; 
import android.net.Uri; 
import android.os.AsyncTask; 
import android.os.Build; 
import android.os.Bundle; 
import android.os.Environment; 
import android.os.Handler; 
import android.util.Log; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.view.Window; 
import android.view.WindowManager; 
import android.view.animation.LinearInterpolator; 
import android.webkit.WebView; 
import android.widget.ImageButton; 
import android.widget.ImageView; 
import android.widget.ProgressBar; 
import android.widget.Scroller; 
import android.widget.SeekBar; 
import android.widget.SeekBar.OnSeekBarChangeListener; 
import android.widget.TextView; 
import android.widget.Toast; 
import android.widget.ToggleButton; 

import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.lang.reflect.Method; 
import java.util.UUID; 

public class MainActivity extends Activity implements OnSeekBarChangeListener { 

public String ultimodato; 

//// 
private static final String TAG = "bluetooth2"; 
Handler h; 
final int RECEIVE_MESSAGE = 1; //1 // Status for Handler 
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 (you must edit this line) 
private static String address = "00:14:02:13:00:10"; 
//// 



@TargetApi(Build.VERSION_CODES.HONEYCOMB) 
@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); 
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); 
    /* se non esiste il folder, creare il folder */ 
    File folder = new File(Environment.getExternalStorageDirectory() + "/Asiagem"); 
    boolean success = true; 
    if (!folder.exists()) { 
     success = folder.mkdir(); 
    } 

    setContentView(R.layout.main); 

    //LETTURA DA FILE DEL MAC-ADDRESS A CUI CONNETTERSI 
    try{ 
     String MACFile = readFileAsString("/sdcard/MAC.txt"); 
     if(MACFile==""){ 
      Toast.makeText(this,"Nessun dispositivo salvato, torno alla fase precedente", Toast.LENGTH_LONG).show(); 
      Intent i = new Intent(getApplicationContext(), Home.class); 
      startActivity(i); 
      finish(); 
     }else { 
      address = MACFile; 
     } 
}catch(Exception e){ 
    Toast.makeText(getApplicationContext(),"Errore nella lettura dei dati" , Toast.LENGTH_LONG).show(); 
    Intent i = new Intent(getApplicationContext(), Home.class); 
    startActivity(i); 
    finish(); 
} 
    h = new Handler() { 
     public void handleMessage(android.os.Message msg) { 
      switch (msg.what) { 
      case RECEIVE_MESSAGE:             // if receive massage 
       byte[] readBuf = (byte[]) msg.obj; 
       String strIncom = new String(readBuf, 0, msg.arg1);     // create string from bytes array 
       Toast.makeText(getBaseContext(), strIncom, Toast.LENGTH_SHORT).show(); 
       Log.d("INCOME", "INCOME: " + strIncom); 

       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); 
    } 





@SuppressWarnings("deprecation") 
@TargetApi(Build.VERSION_CODES.HONEYCOMB) 
public void SendMessageBT(View v){ 
     //INVIO MESSAGGIO AL BLUETOOTH 
     mConnectedThread.write("U"); 
} 



@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() + "."); 
    } 

    // 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(); 

    previousTime = System.currentTimeMillis(); 

    } 

    @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) { 
       if(System.currentTimeMillis() - previousTime > 10000){ 
        previousTime = System.currentTimeMillis(); 
        mConnectedThread.write("w"); 
       } 

       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; 
       } 
      } 
     } 

     /* Call this from the main activity to send data to the remote device */ 
     public void write(String message) { 
      Log.d(TAG, "...Data to send: " + message + "..."); 
      byte[] msgBuffer = message.getBytes(); 
      try { 
       mmOutStream.write(msgBuffer); 
      } catch (IOException e) { 
       Log.d(TAG, "...Error data send: " + e.getMessage() + "..."); 
       ultimodato=message; 
       to_send=true; 
       //connect(); 
       new connect_and_send().execute(); 
      } 
     } 
    } 




    private class connect_and_send extends AsyncTask<Void, Void, Void> { 

     @Override 
     protected void onPreExecute() { // Fa vedere solo il dialog 
      super.onPreExecute(); 
     } 


     @Override 
     protected Void doInBackground(Void... arg0) { 
      try { 
       btSocket.close(); 
       Log.d(TAG, "...ALERT: " + "SOCKET CHIUSA" + "..."); 
      } catch (IOException e2) { 
       errorExit("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + "."); 
       Log.d(TAG, "...ALERT: " + "IMPOSSIBILE CHIUDERE SOCKET" + "..."); 
      } 

      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() + "."); 
      } 

      // 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(); 
      //REINVIA L'ULTIMO DATO 

      if (to_send==true){ 
       mConnectedThread.write(ultimodato); 
       to_send=false; 
      } 

      previousTime = System.currentTimeMillis(); 
     return null; 
     } 


     @Override 
     protected void onPostExecute(Void result) { 
      super.onPostExecute(result); 
     } 
    } 






public static String readFileAsString(String filePath) { 

    String result = ""; 
    File file = new File(filePath); 
    if (file.exists()) { 
     FileInputStream fis = null; 
     try { 
      fis = new FileInputStream(file); 
      char current; 
      while (fis.available() > 0) { 
       current = (char) fis.read(); 
       result = result + String.valueOf(current); 

      } 

     } catch (Exception e) { 
      Log.d("TourGuide", e.toString()); 
     } finally { 
      if (fis != null) 
       try { 
        fis.close(); 
       } catch (IOException ignored) { 
      } 
     } 

    } 
    return result; 
    } 

}