(java, bluetooth-low energy, ble) 如何通过 BLE 从 android 设备获取数据

Posted 2023-03-05

【中文标题】(java, bluetooth-low energy, ble) 如何通过 BLE 从 android 设备获取数据

【英文标题】：(java, bluetooth-lowenergy, ble) how to get data from android device via BLE

【发布时间】：2019-07-01 07:09:34

【问题描述】：

我是 BLE（蓝牙低功耗）的初学者。我想通过 BLE 从安卓设备获取数据。

我已经阅读了 Google 文档中的特征。 我也已经在 google 上搜索过了。

我的设备没有响应我的请求字节码。 我认为这是因为我设置了错误的特征。 因为我认为我没有完全理解特征。

有人帮我设置正确的特征吗？

这是自定义 Uuid（最好在顶部看到添加的图像。）

CUSTOM SERVICE
0783b03e-8535-b5a0-7140-a304d2495cb7

NOTIFY Uuid : 0783B03E-8535-B5A0-7140-A304D2495CB8
Read Uuid : 00002a19-0000-1000-8000-00805f9b34fb
Write Uuid : 0783b03e-8535-b5a0-7140-a304d2495cba

这是我设置的 Uuid

    public final UUID serviceUuid = UUID.fromString("0783b03e-8535-b5a0-7140-a304d2495cb7");
    public final UUID notifyUuid = UUID.fromString("0783b03e-8535-b5a0-7140-a304d2495cb8");
    public final UUID readUuid = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");
    public final UUID writeUuid = UUID.fromString("0783b03e-8535-b5a0-7140-a304d2495cba");

这是我的代码

BluetoothHandler.java

 targetGattCharacteristic = targetGattService.getCharacteristic(Define.GetInstance().notifyUuid);
        BluetoothGattCharacteristic readGattCharacteristic = targetGattService.getCharacteristic(Define.GetInstance().notifyUuid);

        if (readGattCharacteristic != null) 
            mBleService.setCharacteristicNotification(readGattCharacteristic, true);

         else 
            callInterface();
            return;
        

(BluetoothService.java)

    public void setCharacteristicNotification(BluetoothGattCharacteristic characteristic,
                                              boolean enabled) 
        if (mBluetoothAdapter == null || mBluetoothGatt == null) 
            Log.w(TAG, "BluetoothAdapter not initialized");
            return;
        

        mBluetoothGatt.setCharacteristicNotification(characteristic, enabled);

        BluetoothGattDescriptor gD = new BluetoothGattDescriptor(UUID.fromString(Define.GetInstance().readUuid.toString()),  BluetoothGattDescriptor.PERMISSION_WRITE | BluetoothGattDescriptor.PERMISSION_READ);
        characteristic.addDescriptor(gD);
        if (Define.GetInstance().notifyUuid.equals(characteristic.getUuid())) 
            BluetoothGattDescriptor descriptor = characteristic.getDescriptor(
                    UUID.fromString(Define.GetInstance().readUuid.toString()));
            descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
            mBluetoothGatt.writeDescriptor(descriptor);

        
    

【参考方案1】：

我通过参考这个网站解决了这个问题。 https://medium.com/@avigezerit/bluetooth-low-energy-on-android-22bc7310387a