android 藍牙串口通訊使用簡介

需要的權限

<uses-permission android:name="android.permission.BLUETOOTH" /> 
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

 

串口協議UUID

String SPP_UUID = "00001101-0000-1000-8000-00805F9B34FB";

 

需要監聽的相關廣播
  IntentFilter intent = new IntentFilter();
  intent.addAction(BluetoothDevice.ACTION_FOUND);
  intent.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
  intent.addAction(BluetoothAdapter.ACTION_SCAN_MODE_CHANGED);
  intent.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
  registerReceiver(searchDevices, intent);

 

獲取藍牙適配器

btAdapt = BluetoothAdapter.getDefaultAdapter();

 

藍牙未打開時，調用系統打開藍牙提示

if (btAdapt != null && btAdapt.isEnabled() == false) {
   Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
   startActivityForResult(intent, RQ_CODE_OPEN_BT);
   return;
  }

當然，你也可以不使用系統的打開藍牙提示而直接打開藍牙

btAdapt.enable();

關閉藍牙

btAdatp.disable();

 

調用系統藍牙設置

Intent intent = new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);
startActivity(intent);

 

獲取綁定設備列表：

Set<BluetoothDevice> pairedDevices = btAdapt.getBondedDevices();

 

和指定藍牙設備建立socket連接

private void connect(BluetoothDevice btDev) {
        UUID uuid = UUID.fromString(SPP_UUID);
        try {
            btSocket = btDev.createRfcommSocketToServiceRecord(uuid);
            MyLog.i("開始連接...");
            if (btSocket != null) {
                btSocket.connect();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

讀取數據

private readData(){
    InputStream is = null;
    byte[] buffer = new byte[1024];
    InputStream is = null;
    try {                
           is = BTConfigActivity.btSocket.getInputStream(); // 得到藍牙數據輸入流
        num = is.read(buffer); // 讀入數據
        is.close();
   } catch (IOException e) {
    }
}

一般讀取數據可開一線程循環讀取，建立連接的一方藍牙一次發送的數據，另一方可能分多次接收數據，這里需要注意處理。如果使用循環處理，可以使用InputStream的available()方法判斷可以讀取的字節流的長度從而判斷是否有數據輸入。

發送數據

private void sendData(byte[] cmd){
try {
    OutputStream os = BTConfigActivity.btSocket.getOutputStream(); // 藍牙連接輸出流
        os.write(cmd);
    } catch (IOException e) {
    }
}