Android 蓝牙 connect() 抛出错误

我有一个项目要求，其中我们有一个包含两个组件的产品 - 一个 Android 平板电脑和一个 PCB（包含 RN42 蓝牙芯片）。这两个组件位于塑料外壳内，因此总是彼此靠近。这两个组件设备最初会配对一次，因此配对信息将永远存在于平板电脑中。

Problem: 在我的代码中，我使用一个函数来初始化蓝牙套接字并访问 DataOut 和 DataIn 端口，使用这些端口可以在平板电脑和 PCB 之间交换数据。

案例1：当我使用三星S2(4.1.2)和PCB时，这段代码100%有效，

Case2: BUT当我将平板电脑（iball 3G 7271（4.1.2））与印刷电路板一起使用时，大多数时候我在连接到插座时遇到问题。我收到错误说明-

 -Service discovery failed,
 -Connection is not created (failed or aborted).
 -Resource is busy

在大多数情况下。

我尝试过的：

• 尝试使用反射，但没有成功。
• 已使用通用UUID - 00001101-0000-1000-8000-00805F9B34FB，但没有用。

我不明白为什么当我使用带有 RN42 芯片的三星 S2 时代码工作正常，但当我使用带有 RN42 芯片的 iball 平板电脑时代码会抛出错误。在进一步挖掘时，我发现了这篇文章http://redacacia.me/2012/07/17/overcoming-android-bluetooth-blues-with-reflection-method/#comment-1414 http://redacacia.me/2012/07/17/overcoming-android-bluetooth-blues-with-reflection-method/#comment-1414据报道，中国设备（iball 就是其中之一）使用 MTK 处理器，并且存在蓝牙连接问题。

下面是我在设备和 RN42 芯片之间进行蓝牙连接的代码

public class AppFunctions {

    public static BluetoothAdapter mBluetoothAdapter;
    public static BluetoothAdapter iballAdapter = null;
    public static BluetoothSocket Socket = null;
    public static BluetoothDevice RN42_Device;
    private static final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    private static String address = "00:06:66:49:57:60";    // MAC of RN42 bluetooth chip on PCB
    public static OutputStream DataOut = null;
    public static InputStream DataIn = null;

    //Function to turn on BT socket and to initialize it
    public static void setBluetooth(Context context) {

        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

        mBluetoothAdapter.disable(); //Disable bluetooth on device
        mBluetoothAdapter.enable();  //Enable bluetooth on device

        Timer mTimer = new Timer();
        mTimer.schedule(new TimerTask()
        {
            @Override
            public void run()
            {

                iballAdapter = BluetoothAdapter.getDefaultAdapter();
                Log.i("AppFuntions", "iballAdapter - " + iballAdapter);
                RN42_Device = iballAdapter.getRemoteDevice(address);
                Log.i("AppFuntions", "RN42_Device - " + RN42_Device);

                try {
                    Socket = RN42_Device.createRfcommSocketToServiceRecord(MY_UUID);

    /*              tried reflection,but no use
                    Method m = RN42_Device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
                    Socket = (BluetoothSocket) m.invoke(RN42_Device, 5);*/

                    resetConnection();
                    connect();

                    Log.i("AppFunctions", "DataOut -" + DataOut);
                    Log.i("AppFunctions", "DataIn -" + DataIn);
                } catch (Exception e) {e.printStackTrace();}

                }
        }, 10000);
    }

    private static void resetConnection() {
        if (DataIn != null) {
            try {DataIn.close();} catch (Exception e) {}
            DataIn = null;
        }

        if (DataOut != null) {
            try {DataOut.close();} catch (Exception e) {}
            DataOut = null;
        }

        if (Socket != null) {
            try {Socket.close();} catch (Exception e) {}
            Socket = null;
        }
    }

    private static boolean connect() {

        // Reset all streams and socket.
        resetConnection();

        if (RN42_Device == null)
            RN42_Device = iballAdapter.getRemoteDevice(address);

        // Make an RFCOMM binding.
        try {
            Socket = RN42_Device.createRfcommSocketToServiceRecord(MY_UUID);

/*          tried reflection,but no use
            Method m = RN42_Device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
            Socket = (BluetoothSocket) m.invoke(RN42_Device, 5);*/

        } catch (Exception e1) {e1.printStackTrace();return false;}

        try {

            Socket.connect(); // Fails here most of the time for iball tablet and RN42,though works always for samsung S2 and Rn42
        } catch (Exception e) {e.printStackTrace();return false;}

        try {
            DataOut = Socket.getOutputStream();
            DataIn = Socket.getInputStream();
        } catch (Exception e) {e.printStackTrace();return false;}

        return true;
    }
}

三星 s2 的日志（一直工作正常）：

 I/AppFuntions(21103): iballAdapter - android.bluetooth.BluetoothAdapter@41fe9250
 I/AppFuntions(21103): RN42_Device - 00:06:66:49:57:60
 V/BluetoothSocket.cpp(21103): initSocketNative
 V/BluetoothSocket.cpp(21103): ...fd 66 created (RFCOMM, lm = 26)
 V/BluetoothSocket.cpp(21103): initSocketFromFdNative
 I/BluetoothConn(21103): connecting to Socket
 V/BluetoothSocket.cpp(21103): abortNative
 V/BluetoothSocket.cpp(21103): ...asocket_abort(53) complete
 V/BluetoothSocket.cpp(21103): destroyNative
 V/BluetoothSocket.cpp(21103): ...asocket_destroy(53) complete
 V/BluetoothSocket.cpp(21103): abortNative
 V/BluetoothSocket.cpp(21103): ...asocket_abort(66) complete
 V/BluetoothSocket.cpp(21103): destroyNative
 V/BluetoothSocket.cpp(21103): ...asocket_destroy(66) complete
 V/BluetoothSocket.cpp(21103): initSocketNative
 V/BluetoothSocket.cpp(21103): ...fd 53 created (RFCOMM, lm = 26)
 V/BluetoothSocket.cpp(21103): initSocketFromFdNative
 D/BluetoothUtils(21103): isSocketAllowedBySecurityPolicy start : device null
 V/BluetoothSocket.cpp(21103): connectNative
 V/BluetoothSocket.cpp(21103): ...connect(53, RFCOMM) = 0 (errno 115)
 I/AppFunctions(21103): DataOut -android.bluetooth.BluetoothOutputStream@41e8b688
 I/AppFunctions(21103): DataIn -android.bluetooth.BluetoothInputStream@41e95790

使用 MKT 系列处理器记录 iball 平板电脑：（logcat 错误之一）：

 I/AppFuntions(10598): iballAdapter - android.bluetooth.BluetoothAdapter@426ebb88
 I/AppFuntions(10598): RN42_Device - 00:06:66:49:57:60
 I/BluetoothSocket_MTK(10598): [JSR82] Bluetooth Socket Constructor
 I/BluetoothSocket_MTK(10598): [JSR82] type=1 fd=-1 auth=true encrypt=true port=-1
 I/BluetoothConn(10598): connecting to Socket
 I/BluetoothSocket_MTK(10598): [JSR82] close
 I/BluetoothSocket_MTK(10598): [JSR82] readLock got.
 I/BluetoothSocket_MTK(10598): [JSR82] Bluetooth Socket Constructor
 I/BluetoothSocket_MTK(10598): [JSR82] type=1 fd=-1 auth=true encrypt=true port=-1
 I/BluetoothSocket_MTK(10598): [JSR82] connect: do SDP
 I/BluetoothSocket_MTK(10598): [JSR82] SdpHelper::onRfcommChannelFound: channel=1
 I/BluetoothSocket_MTK(10598): [JSR82] connect: do SDP done; mPort=1
 W/System.err(10598): java.io.IOException: [JSR82] connect: Connection is not created (failed or aborted).
 W/System.err(10598):   at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:395)
 W/System.err(10598):   at com.example.guardmonitor.commons.AppFunctions.connect(AppFunctions.java:193)
 W/System.err(10598):   at com.example.guardmonitor.commons.AppFunctions.access$3(AppFunctions.java:176)
 W/System.err(10598):   at com.example.guardmonitor.commons.AppFunctions$1.run(AppFunctions.java:109)
 W/System.err(10598):   at java.util.Timer$TimerImpl.run(Timer.java:284)
 I/AppFunctions(10598): DataOut -null
 I/AppFunctions(10598): DataIn -null

请告诉我 ：

• 我做错了什么/我应该做什么来解决我的 iball 平板电脑与 Rn42 芯片的连接问题。
• 任何有用的资源都可以分享。

提前致谢！