Android，如何使 BLE 设备成为配对设备（绑定）

Question

在关贸总协定之前， createRfcommSocketToServiceRecord, createInsecureRfcommSocketToServiceRecord

方法可以配对设备，

但 GATT 没有关于配对设备的选项， 只使用 BluetoothDevice.connectGatt(...)

如果设备已经连接，我想制作配对设备。

谢谢。

Answer 1

据我所知，在 BLE 中启动配对程序有两种方法：

1) 从 API 19 起，您可以通过调用 mBluetoothDevice.createBond() 来开始配对。您无需连接远程 BLE 设备即可开始配对过程。

2) 当你尝试做一个 Gatt 操作时，我们以方法为例

mBluetoothGatt.readCharacteristic(characteristic)

如果需要绑定远程BLE设备进行任何通信，那么回调时

onCharacteristicRead( BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status)

调用它的status 参数值将等于GATT_INSUFFICIENT_AUTHENTICATION 或GATT_INSUFFICIENT_ENCRYPTION，而不等于GATT_SUCCESS。如果发生这种情况，则配对过程将自动启动。

这是一个示例，用于找出调用 onCharacteristicRead 回调后何时失败

@Override
public void onCharacteristicRead(
        BluetoothGatt gatt,
        BluetoothGattCharacteristic characteristic,
        int status)
{

    if(BluetoothGatt.GATT_SUCCESS == status)
    {
        // characteristic was read successful
    }
    else if(BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION == status ||
            BluetoothGatt.GATT_INSUFFICIENT_ENCRYPTION == status)
    {
        /*
         * failed to complete the operation because of encryption issues,
         * this means we need to bond with the device
         */

        /*
         * registering Bluetooth BroadcastReceiver to be notified
         * for any bonding messages
         */
        IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
        mActivity.registerReceiver(mReceiver, filter);
    }
    else
    {
        // operation failed for some other reason
    }
}

其他人提到此操作会自动启动配对程序： Android Bluetooth Low Energy Pairing

这就是接收器的实现方式

private final BroadcastReceiver mReceiver = new BroadcastReceiver()
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        final String action = intent.getAction();

        if (action.equals(BluetoothDevice.ACTION_BOND_STATE_CHANGED))
        {
            final int state = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, BluetoothDevice.ERROR);

            switch(state){
                case BluetoothDevice.BOND_BONDING:
                    // Bonding...
                    break;

                case BluetoothDevice.BOND_BONDED:
                    // Bonded...
                    mActivity.unregisterReceiver(mReceiver);
                    break;

                case BluetoothDevice.BOND_NONE:
                    // Not bonded...
                    break;
            }
        }
    }
};