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以编程方式配对后,Android会自动连接蓝牙设备

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在我的应用程序中,我需要配对蓝牙设备并立即与它连接 .

我有以下功能,以配对设备:

public boolean createBond(BluetoothDevice btDevice)
{
    try {
        Log.d("pairDevice()", "Start Pairing...");
        Method m = btDevice.getClass().getMethod("createBond", (Class[]) null);
        Boolean returnValue = (Boolean) m.invoke(btDevice, (Object[]) null);
        Log.d("pairDevice()", "Pairing finished.");
        return returnValue;

    } catch (Exception e) {
        Log.e("pairDevice()", e.getMessage());
    }
    return false;
}

我用它如下:

Boolean isBonded = false;
try {
    isBonded = createBond(bdDevice);
    if(isBonded)
    {
         //Connect with device
    }
}

它显示了配对设备和输入引脚的对话框 .

问题是createBond函数总是返回true,它一直等到我输入引脚并与设备配对,所以我没有正确使用:

isBonded = createBond(bdDevice);
if(isBonded) {...}

所以问题是我如何与设备配对以及何时配对连接?

P.D我的代码基于以下主题的第一个答案:Android + Pair devices via bluetooth programmatically

1 回答

  • 4

    我找到了解决方案 .

    首先,我需要 BroadcastReceiver 喜欢:

    private BroadcastReceiver myReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_BOND_STATE_CHANGED.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
                    // CONNECT
                }
            } else if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                // Discover new device
            }
        }
    };
    

    然后我需要注册接收器如下:

    IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    intentFilter.addAction(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
    context.registerReceiver(myReceiver, intentFilter);
    

    通过这种方式,接收器正在监听 ACTION_FOUND (发现新设备)和 ACTION_BOND_STATE_CHANGED (设备更改其绑定状态),然后我检查新状态是否为 BOND_BOUNDED 以及是否我与设备连接 .

    现在,当我调用 createBond 方法(在问题中描述)并输入引脚时, ACTION_BOND_STATE_CHANGED 将触发, device.getBondState() == BluetoothDevice.BOND_BONDED 将为 True ,它将连接 .

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