Question

我需要为发送请求创建RFCOMM蓝牙套接字，并使用blutooth从服务器获取响应。需要在客户端创建蓝牙套接字，以便使用android bluetooth api进行请求和响应。我怎么能创造这个..

我试过这个

public class MainActivity extends Activity {
      TextView out;
      private static final int REQUEST_ENABLE_BT = 1;
      private BluetoothAdapter btAdapter = null;
      private BluetoothSocket btSocket = null;
      private OutputStream outStream = null;

      // Well known SPP UUID
      private static final UUID MY_UUID =
          UUID.fromString("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");

      // Insert your server's MAC address
      private static String address = "xxxxxxxxxxxxxxxx";

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

        out = (TextView) findViewById(R.id.out);

      //  out.append("\n...In onCreate()...");

        btAdapter = BluetoothAdapter.getDefaultAdapter();
        CheckBTState();
      }

      @Override
      public void onStart() {
        super.onStart();
     //   out.append("\n...In onStart()...");
      }

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

        out.append("\n...In onResume...\n...Attempting client 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 = device.createRfcommSocketToServiceRecord(MY_UUID);
        } catch (IOException e) {
          AlertBox("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.
        try {
          btSocket.connect();
          out.append("\n...Connection established and data link opened...");
        } catch (IOException e) {
          try {
            btSocket.close();
          } catch (IOException e2) {
            AlertBox("Fatal Error", "In onResume() and unable to close socket during connection failure" + e2.getMessage() + ".");
          }
        }

        // Create a data stream so we can talk to server.
        out.append("\n...Sending message to server...");

        try {
          outStream = btSocket.getOutputStream();
        } catch (IOException e) {
          AlertBox("Fatal Error", "In onResume() and output stream creation failed:" + e.getMessage() + ".");
        }


        String message = "DECapabilities?$format=json";
        byte[] msgBuffer = message.getBytes();
        try {
          outStream.write(msgBuffer);
        } catch (IOException e) {
          String msg = "In onResume() and an exception occurred during write: " + e.getMessage();
          if (address.equals("00:00:00:00:00:00")) 
            msg = msg + ".\n\nUpdate your server address from 08:ED:B9:48:EE:C0 to the correct address on line 37 in the java code";
          msg = msg +  ".\n\nCheck that the SPP UUID: " + MY_UUID.toString() + " exists on server.\n\n";

          AlertBox("Fatal Error", msg);       
        }
      }

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

        out.append("\n...In onPause()...");

        if (outStream != null) {
          try {
            outStream.flush();
          } catch (IOException e) {
            AlertBox("Fatal Error", "In onPause() and failed to flush output stream: " + e.getMessage() + ".");
          }
        }

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

      @Override
      public void onStop() {
        super.onStop();
        out.append("\n...In onStop()...");
      }

      @Override
      public void onDestroy() {
        super.onDestroy();
        out.append("\n...In onDestroy()...");
      }

      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) { 
          AlertBox("Fatal Error", "Bluetooth Not supported. Aborting.");
        } else {
          if (btAdapter.isEnabled()) {
            out.append("\n...Bluetooth is enabled...");
          } else {
            //Prompt user to turn on Bluetooth
            Intent enableBtIntent = new Intent(btAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
          }
        }
      }

      public void AlertBox( String title, String message ){
        new AlertDialog.Builder(this)
        .setTitle( title )
        .setMessage( message + " Press OK to exit." )
        .setPositiveButton("OK", new OnClickListener() {
            public void onClick(DialogInterface arg0, int arg1) {
              finish();
            }
        }).show();
      }
    }

但是获得套接字关闭异常。

Answer 1

我通过BluetoothChat解决了这个问题，它非常有帮助。

http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android-apps/2.1_r2/com/example/android/BluetoothChat/BluetoothChat.java

使用api创建RFCOMM蓝牙套接字

1 个答案: