蓝牙耳机自动回连代码

以下是一个Android平台上的蓝牙耳机自动回连的代码示例：

public class BluetoothReceiver extends BroadcastReceiver {
    private BluetoothAdapter mBluetoothAdapter;
    private BluetoothDevice mDevice;
    private Context mContext;

    public BluetoothReceiver(Context context) {
        mContext = context;
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED)) {
            mDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        } else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED)) {
            if (mDevice != null) {
                BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(mDevice.getAddress());
                if (device != null && device.getBondState() == BluetoothDevice.BOND_BONDED) {
                    try {
                        Method connectMethod = device.getClass().getMethod("connect", null);
                        connectMethod.invoke(device, null);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }
    }
}

这个代码监听了蓝牙设备的连接和断开事件。当蓝牙设备连接时，记录下该设备；当蓝牙设备断开时，尝试使用反射调用BluetoothDevice的connect方法进行重连。请注意，这个代码只适用于已经配对过的、曾经连接过的设备。

在你的Android应用程序中，你需要注册这个BroadcastReceiver，如下所示：

BluetoothReceiver receiver = new BluetoothReceiver(this);
IntentFilter filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED);
filter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED);
registerReceiver(receiver, filter);

请注意，这个代码只是一个示例，实际使用时需要根据你的具体需求进行修改和完善。