Android 藍牙連接

定義廣播：
private BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);
            handleStateChanged(state);
        } else if (action.equals(BluetoothDevice.ACTION_FOUND)) {
            BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            if (HOME_BASE.equals(device.getName())) {
                bluetoothDevice = device;
                bluetoothDevice.createBond();
            }
        } else if (action.equals(BluetoothDevice.ACTION_PAIRING_REQUEST)) {
            if (bluetoothDevice != null) {
                bluetoothDevice.setPairingConfirmation(true);
                bluetoothDevice.setPin(PIN.getBytes());
            }
        } else if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED)) {
            if (bluetoothDevice.getBondState() == BluetoothDevice.BOND_BONDED) {
                if (bluetoothA2dp != null) {
                    bluetoothA2dp.connect(bluetoothDevice);
                }
            }
        }
    }
};

藍牙狀態處理方法：
private void handleStateChanged(int state) {
    switch (state) {
        case BluetoothAdapter.STATE_TURNING_ON:
            break;
        case BluetoothAdapter.STATE_ON:
            bluetoothDevice = null;
            bluetoothAdapter.startDiscovery();
            break;
        case BluetoothAdapter.STATE_TURNING_OFF:

            break;
        case BluetoothAdapter.STATE_OFF:
            bluetoothAdapter.cancelDiscovery();
            break;
    }
}

定義serviceListener：
BluetoothProfile.ServiceListener serviceListener = new BluetoothProfile.ServiceListener() {
    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy) {
        bluetoothA2dp = (BluetoothA2dp) proxy;
    }

    @Override
    public void onServiceDisconnected(int profile) {
        bluetoothA2dp = null;
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    bluetoothManager = (BluetoothManager) getSystemService(BLUETOOTH_SERVICE);
    bluetoothAdapter = bluetoothManager.getAdapter();
//獲取A2DP的服務代理
    bluetoothAdapter.getProfileProxy(this, serviceListener, BluetoothProfile.A2DP);    intentFilter = new IntentFilter();
    intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
    intentFilter.addAction(BluetoothDevice.ACTION_FOUND);
    intentFilter.addAction(BluetoothDevice.ACTION_PAIRING_REQUEST);
    intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
}

@Override
protected void onStart() {
    super.onStart();
    registerReceiver(bluetoothReceiver, intentFilter);
}

@Override
protected void onStop() {
    super.onStop();
    unregisterReceiver(bluetoothReceiver);
    bluetoothAdapter.closeProfileProxy(BluetoothProfile.A2DP, bluetoothA2dp);
}