如何在Android中无对读取Bluethooth BLE设备中的数据

<uses-permission android:name="android.permission.BLUETOOTH"/>
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
<uses-feature android:name="android.hardware.bluetooth_le" android:required="true"/>

BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (bluetoothAdapter == null) {
    // 设备不支持蓝牙
    return;
}

BluetoothLeScanner bluetoothLeScanner = bluetoothAdapter.getBluetoothLeScanner();
ScanCallback scanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        // 处理扫描到的设备
    }
};
bluetoothLeScanner.startScan(scanCallback);

BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            // 连接成功，开始发现服务
            gatt.discoverServices();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            // 服务发现成功，读取特征值
            BluetoothGattService service = gatt.getService(serviceUuid);
            BluetoothGattCharacteristic characteristic = service.getCharacteristic(characteristicUuid);
            gatt.readCharacteristic(characteristic);
        }
    }

    @Override
    public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            // 读取特征值成功，处理数据
            byte[] data = characteristic.getValue();
            // 处理数据
        }
    }
};
BluetoothGatt bluetoothGatt = device.connectGatt(context, false, gattCallback);