Xamarin Android 蓝牙套接字连接失败

Question

我正在尝试创建一个示例 Xamarin Android 应用程序以通过蓝牙连接设备。

当我尝试连接蓝牙插座时出现以下错误

  at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw () [0x0000c] in /Users/builder/data/lanes/3819/96c7ba6c/source/mono/mcs/class/referencesource/mscorlib/system/runtime/exceptionservices/exceptionservicescommon.cs:143 
  at Java.Interop.JniEnvironment+InstanceMethods.CallVoidMethod (Java.Interop.JniObjectReference instance, Java.Interop.JniMethodInfo method, Java.Interop.JniArgumentValue* args) [0x00084] in /Users/builder/data/lanes/3819/96c7ba6c/source/Java.Interop/src/Java.Interop/Java.Interop/JniEnvironment.g.cs:11643 
  at Java.Interop.JniPeerMembers+JniInstanceMethods.InvokeAbstractVoidMethod (System.String encodedMember, Java.Interop.IJavaPeerable self, Java.Interop.JniArgumentValue* parameters) [0x00017] in /Users/builder/data/lanes/3819/96c7ba6c/source/Java.Interop/src/Java.Interop/Java.Interop/JniPeerMembers.JniInstanceMethods_Invoke.cs:15 
  at Android.Bluetooth.BluetoothSocket.Connect () [0x00000] in /Users/builder/data/lanes/3819/96c7ba6c/source/monodroid/src/Mono.Android/platforms/android-24/src/generated/Android.Bluetooth.BluetoothSocket.cs:141 
  at Bluetooth.Droid.Activities.Bluetooth.BluetoothActivity.PairedDevicesListView_ItemClick (System.Object sender, Android.Widget.AdapterView+ItemClickEventArgs e) [0x00094] in C:\Git\Bluetooth\Bluetooth\Bluetooth.Droid\Activities\Bluetooth\BluetoothActivity.cs:92 
  --- End of managed Java.IO.IOException stack trace ---
java.io.IOException: read failed, socket might closed or timeout, read ret: -1
    at android.bluetooth.BluetoothSocket.readAll(BluetoothSocket.java:517)
    at android.bluetooth.BluetoothSocket.readInt(BluetoothSocket.java:528)
    at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:320)
    at mono.android.widget.AdapterView_OnItemClickListenerImplementor.n_onItemClick(Native Method)
    at mono.android.widget.AdapterView_OnItemClickListenerImplementor.onItemClick(AdapterView_OnItemClickListenerImplementor.java:30)
    at android.widget.AdapterView.performItemClick(AdapterView.java:305)
    at android.widget.AbsListView.performItemClick(AbsListView.java:1146)
    at android.widget.AbsListView$PerformClick.run(AbsListView.java:3053)
    at android.widget.AbsListView$3.run(AbsListView.java:3860)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:135)
    at android.app.ActivityThread.main(ActivityThread.java:5343)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)

您可以在https://github.com/sstechGitHost/Bluetooth.git找到我的示例

谢谢， 纳希德

Answer 1

您正在与另一台设备不支持的 UUID 配对的问题。这是解决此问题的示例代码。请记住，此解决方案可能需要一些稳健性，这只是概念证明。人们说 FetchUuidsWithSdp 不是很稳定，所以你可能想注册广播动作来获取 UUID 或类似的东西。现在是代码。 而不是

BluetoothSocket btSocket = btDevice.CreateRfcommSocketToServiceRecord(UUID.FromString("00001101-0000-1000-8000-00805F9B34FB"));

我用过

ParcelUuid[] uuids = null;
                if (btDevice.FetchUuidsWithSdp())
                {
                    uuids = btDevice.GetUuids();
                }
                if ((uuids != null) && (uuids.Length > 0))
                {
                    foreach (var uuid in uuids)
                    {
                        try
                        {
                            btSocket = btDevice.CreateRfcommSocketToServiceRecord(uuid.Uuid);
                            btSocket.Connect();
                            break;
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("ex: " + ex.Message);
                        }
                    }
                }

并且能够使用 UUID 连接到另一台设备

0000111f-0000-1000-8000-00805f9b34fb    
00001132-0000-1000-8000-00805f9b34fb    
00000000-deca-fade-deca-deafdecacafe

但不是“ 串行”你正在使用。