Question

我正在尝试在运行Android 4.0.3的三星Galaxy S3与RN 42蓝牙芯片之间建立蓝牙连接，here就是型号：

我使用了许多不同的代码来设置蓝牙串行通信，并且所有这些都在我之前使用的HTC Wildfire上运行得非常好。但是现在我正在使用galaxy s3手机，因此无法建立联系。这是我正在使用的代码，我发现它here：

我将权限放在android清单中。

首先，我的蓝牙接口：

public class BtInterface {

private BluetoothDevice device = null;
private BluetoothSocket socket = null;
private InputStream receiveStream = null;
private OutputStream sendStream = null;

private ReceiverThread receiverThread;

Handler handler;

public BtInterface(Handler hstatus, Handler h) {
    Set<BluetoothDevice> setpairedDevices = BluetoothAdapter.getDefaultAdapter().getBondedDevices();
    BluetoothDevice[] pairedDevices = (BluetoothDevice[]) setpairedDevices.toArray(new BluetoothDevice[setpairedDevices.size()]);

    for(int i=0;i<pairedDevices.length;i++) {
        if(pairedDevices[i].getName().contains("MyBluetoothChip")) {
            device = pairedDevices[i];
            try {
                socket = device.createRfcommSocketToServiceRecord(UUID.fromString("00001101-0000-1000-8000-00805F9B34FB"));
                receiveStream = socket.getInputStream();
                sendStream = socket.getOutputStream();
            } catch (IOException e) {
                e.printStackTrace();
            }
            break;
        }
    }

    handler = hstatus;

    receiverThread = new ReceiverThread(h);
}

public void sendData(String data) {
    sendData(data, false);
}

public void sendData(String data, boolean deleteScheduledData) {
    try {
        sendStream.write(data.getBytes());
        sendStream.flush();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public void connect() {
    new Thread() {
        @Override public void run() {
            try {
                socket.connect();

                Message msg = handler.obtainMessage();
                msg.arg1 = 1;
                handler.sendMessage(msg);

                receiverThread.start();

            } catch (IOException e) {
                Log.v("N", "Connection Failed : "+e.getMessage());
                e.printStackTrace();
            }
        }
    }.start();
}

public void close() {
    try {
        socket.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

public BluetoothDevice getDevice() {
    return device;
}

private class ReceiverThread extends Thread {
    Handler handler;

    ReceiverThread(Handler h) {
        handler = h;
    }

    @Override public void run() {
        while(true) {
            try {
                if(receiveStream.available() > 0) {

                    byte buffer[] = new byte[100];
                    int k = receiveStream.read(buffer, 0, 100);

                    if(k > 0) {
                        byte rawdata[] = new byte[k];
                        for(int i=0;i<k;i++)
                            rawdata[i] = buffer[i];

                        String data = new String(rawdata);

                        Message msg = handler.obtainMessage();
                        Bundle b = new Bundle();
                        b.putString("receivedData", data);
                        msg.setData(b);
                        handler.sendMessage(msg);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
}

然后，我的主要活动，只需一个连接按钮和聊天：

public class MonApp extends Activity implements OnClickListener {

private TextView logview;
private EditText sendtext;
private Button connect, send;

private BtInterface bt = null;

private long lastTime = 0;

final Handler handler = new Handler() {
    public void handleMessage(Message msg) {
        String data = msg.getData().getString("receivedData");

        long t = System.currentTimeMillis();
        if(t-lastTime > 100) {// Pour Èviter que les messages soit coupÈs
            logview.append("\n");
            lastTime = System.currentTimeMillis();
        }
        logview.append(data);
    }
};

final Handler handlerStatus = new Handler() {
    public void handleMessage(Message msg) {
        int co = msg.arg1;
        if(co == 1) {
            logview.append("Connected\n");
        } else if(co == 2) {
            logview.append("Disconnected\n");
        }
    }
};

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    bt = new BtInterface(handlerStatus, handler);

    logview = (TextView)findViewById(R.id.logview);
    sendtext = (EditText)findViewById(R.id.sendtxt);

    connect = (Button)findViewById(R.id.connect);
    connect.setOnClickListener(this);

    send = (Button)findViewById(R.id.send);
    send.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    if(v == connect) {
        bt.connect();
    } else if(v == send) {
        bt.sendData(sendtext.getText().toString());
    }
}
}

当我尝试连接到芯片时，这是我从logcat获得的：

09-05 11:37:05.515: I/BluetoothPolicyService(2097): getBluetoothDataTransferAllowed 
09-05 11:37:05.520: D/BluetoothPolicyService(2097): MDM: isProfileEnabled = true
09-05 11:37:05.520: D/BluetoothUtils(6868): isSocketAllowedBySecurityPolicy start : device null
09-05 11:37:05.525: V/BluetoothService.cpp(2097): createDeviceNative
09-05 11:37:05.525: V/BluetoothService.cpp(2097): createDeviceNative
09-05 11:37:05.525: V/BluetoothEventLoop.cpp(2097): onCreateDeviceResult
09-05 11:37:05.525: V/BluetoothEventLoop.cpp(2097): onCreateDeviceResult
09-05 11:37:05.525: E/BluetoothEventLoop.cpp(2097): onCreateDeviceResult: D-Bus error: org.bluez.Error.AlreadyExists (Already Exists)
09-05 11:37:05.525: V/BluetoothService.cpp(2097): discoverServicesNative
09-05 11:37:05.525: V/BluetoothService.cpp(2097): ... Object Path = /org/bluez/3094/hci0/dev_00_06_66_43_A1_E6
09-05 11:37:05.525: V/BluetoothService.cpp(2097): ... Pattern = , strlen = 0
09-05 11:37:10.660: V/BluetoothEventLoop.cpp(2097): onDiscoverServicesResult
09-05 11:37:10.660: V/BluetoothEventLoop.cpp(2097): ... Device Path = /org/bluez/3094/hci0/dev_00_06_66_43_A1_E6
09-05 11:37:10.660: E/BluetoothEventLoop.cpp(2097): onDiscoverServicesResult: D-Bus error: org.bluez.Error.ConnectionAttemptFailed (Host is down)
09-05 11:37:10.670: V/N(6868): Connection Failed : Service discovery failed
09-05 11:37:10.670: W/System.err(6868): java.io.IOException: Service discovery failed
09-05 11:37:10.675: W/System.err(6868):     at android.bluetooth.BluetoothSocket$SdpHelper.doSdp(BluetoothSocket.java:462)
09-05 11:37:10.675: W/System.err(6868):     at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:240)
09-05 11:37:10.675: W/System.err(6868):     at com.example.bluetooth.BtInterface$1.run(BtInterface.java:68)

我无法弄清楚为什么这段代码不适用于galaxy s3。我试图在google上搜索蓝牙兼容性问题，但到目前为止我没有找到任何东西。

谢谢！

纪尧姆

Answer 1

新的Android ICS存在大量蓝牙不兼容问题。显然他们乱用蓝牙代码来“提高安全性”。

我找到并报告的bug（这使我的整个嵌入式主板无法与任何Android ICS设备连接一周）是在建立与已配对设备的连接时，Android ICS需要重新启动 - 身份验证 - 使用或不使用PIN取决于您是否使用Bluetooth SSP（我使用它 - 这意味着对我来说，在没有用户交互的情况下仍然可以在Android ICS连接2个绑定设备 - 但需要更长的时间）。

Please vote this bug on Google Bugtracker - maybe someone will fix it...

也许这也是你的问题？你能准确指出代码中断的行吗？使用try / catch等覆盖所有蓝牙系统代码

无论如何，新的蓝牙行为非常糟糕，我听说很多人因为它而无法连接到旧耳机。

Answer 2

您的代码似乎是正确的，但正如Radu所说，新的蓝牙行为并不是那么好。我自己确实遇到了一些麻烦（使用Android 4.1+）并最终使用BlueTerm作为我的应用程序的基础，因为它是开源并且正在工作（至少对于连接部分）。

你可以在这里找到它的来源：
http://pymasde.es/blueterm/

我希望它可以帮助你！
d

搭配Galaxy S3的Android蓝牙SPP

2 个答案: