安卓作为BLE外设设备时的具体代码

以下是一个简单的Android BLE外设设备的代码示例：

1. 首先，在AndroidManifest.xml文件中添加以下权限：

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

2. 在你的Activity或Service中创建BluetoothAdapter和BluetoothGattServer对象：

BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
BluetoothAdapter bluetoothAdapter = bluetoothManager.getAdapter();
BluetoothGattServer bluetoothGattServer = bluetoothManager.openGattServer(this, gattServerCallback);

3. 实现BluetoothGattServerCallback回调接口，处理BLE连接请求和数据传输：

private BluetoothGattServerCallback gattServerCallback = new BluetoothGattServerCallback() {
    @Override
    public void onConnectionStateChange(BluetoothDevice device, int status, int newState) {
        super.onConnectionStateChange(device, status, newState);
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            Log.d(TAG, "Device connected: " + device.getAddress());
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            Log.d(TAG, "Device disconnected: " + device.getAddress());
        }
    }

    @Override
    public void onCharacteristicReadRequest(BluetoothDevice device, int requestId, int offset, BluetoothGattCharacteristic characteristic) {
        super.onCharacteristicReadRequest(device, requestId, offset, characteristic);
        // 处理读取请求
    }

    @Override
    public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {
        super.onCharacteristicWriteRequest(device, requestId, characteristic, preparedWrite, responseNeeded, offset, value);
        // 处理写入请求
    }
};

4. 创建BLE服务和特征，添加到Gatt服务器中：

BluetoothGattService service = new BluetoothGattService(SERVICE_UUID, BluetoothGattService.SERVICE_TYPE_PRIMARY);

BluetoothGattCharacteristic characteristic = new BluetoothGattCharacteristic(CHARACTERISTIC_UUID, BluetoothGattCharacteristic.PROPERTY_READ | BluetoothGattCharacteristic.PROPERTY_WRITE, BluetoothGattCharacteristic.PERMISSION_READ | BluetoothGattCharacteristic.PERMISSION_WRITE);

service.addCharacteristic(characteristic);

bluetoothGattServer.addService(service);

5. 处理BLE读取和写入请求：

@Override
public void onCharacteristicReadRequest(BluetoothDevice device, int requestId, int offset, BluetoothGattCharacteristic characteristic) {
    super.onCharacteristicReadRequest(device, requestId, offset, characteristic);
    // 处理读取请求
    byte[] value = characteristic.getValue();
    bluetoothGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);
}

@Override
public void onCharacteristicWriteRequest(BluetoothDevice device, int requestId, BluetoothGattCharacteristic characteristic, boolean preparedWrite, boolean responseNeeded, int offset, byte[] value) {
    super.onCharacteristicWriteRequest(device, requestId, characteristic, preparedWrite, responseNeeded, offset, value);
    // 处理写入请求
    characteristic.setValue(value);
    bluetoothGattServer.sendResponse(device, requestId, BluetoothGatt.GATT_SUCCESS, offset, value);
}

6. 开启BLE广播以使其他设备能够发现并连接到您的设备：

AdvertiseSettings settings = new AdvertiseSettings.Builder()
        .setAdvertiseMode(AdvertiseSettings.ADVERTISE_MODE_LOW_POWER)
        .setConnectable(true)
        .setTimeout(0)
        .setTxPowerLevel(AdvertiseSettings.ADVERTISE_TX_POWER_LOW)
        .build();

AdvertiseData data = new AdvertiseData.Builder()
        .setIncludeDeviceName(true)
        .setIncludeTxPowerLevel(false)
        .addServiceUuid(new ParcelUuid(SERVICE_UUID))
        .build();

bluetoothLeAdvertiser.startAdvertising(settings, data, advertiseCallback);

这是一个简单的BLE外设设备的示例代码，您可以根据您的需求进行修改和扩展。请注意，这只是一个示例，并不保证在所有设备上都能正常工作。