连接到Android 2.1中的配对蓝牙设备（BluetoothSocket）

Question

I am trying to connect to a paired bluetooth device (baracoda d-fly bar code reader). I tried the program GetBlueDemo from market and this manages to read from its socket.

I wrote my own proof of concept, but i just keep getting an excpetion when i try to connect to the device.

08-23 14:39:28.635: DEBUG/BluetoothTest(19238): Could not connect to socket
08-23 14:39:28.635: DEBUG/BluetoothTest(19238): java.io.IOException: socket failed to connect
08-23 14:39:28.635: DEBUG/BluetoothTest(19238):     at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:255)
08-23 14:39:28.635: DEBUG/BluetoothTest(19238):     at org.me.barcodetest.MainActivity$ConnectRunnable.run(MainActivity.java:211)
08-23 14:39:28.635: DEBUG/BluetoothTest(19238):     at java.lang.Thread.run(Thread.java:1102)

Any suggestions on what i am doing wrong?

package org.me.barcodetest;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.DialogInterface;
import android.content.DialogInterface.OnCancelListener;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Set;
import java.util.UUID;

public class MainActivity extends Activity {

private static final int REQUEST_ENABLE_BT = 2;
private BluetoothAdapter bluetoothAdapter;
private UUID applicationUUID = java.util.UUID.randomUUID();
private static final String logTag = "BluetoothTest";

@Override
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if (bluetoothAdapter == null) {
        Log.d(logTag, "Could not get bluetooth adapter");
        return;
    }
    searchForDevices();
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_ENABLE_BT) {
        if (requestCode == RESULT_OK) {
            Log.d("BluetoothTest", "bluetooth enabled");
            searchForDevices();
        } else {
            Log.d("BluetoothTest", "Could not enable bluetooth device");
        }
    }

}

public void lineReadFromBluetoothDevice(String line) {
    Log.d(logTag, "Mottok: " + line);
}

private void searchForDevices() {
    if (bluetoothAdapter.isEnabled()) {
        Set<BluetoothDevice> devicesAvailable = bluetoothAdapter.getBondedDevices();
        if (devicesAvailable.isEmpty()) {
            informUserNoDevicesPaired();
        } else {
            askUserToPickDeviceToUse(devicesAvailable);
        }
    } else {
        Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
        startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
    }
}

private void askUserToPickDeviceToUse(Set<BluetoothDevice> devicesAvailable) {
    final ListView view = new ListView(this);
    view.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
    ArrayAdapter<BluetoothDevice> adapter =
            new ArrayAdapter(this, R.layout.devicesavailabletextview, devicesAvailable.toArray(new BluetoothDevice[devicesAvailable.size()])) {

                @Override
                public View getView(int position, View convertView, ViewGroup parent) {
                    TextView view = (TextView) super.getView(position, convertView, parent);
                    BluetoothDevice bluetoothDevice = (BluetoothDevice) getItem(position);
                    view.setText(bluetoothDevice.getName() + " : " + bluetoothDevice.getAddress());
                    return view;
                }
            };
    view.setAdapter(adapter);
    view.setOnItemClickListener(new OnItemClickListener() {

        public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
            pairToDevice((BluetoothDevice) view.getItemAtPosition(position));
        }
    });


    Dialog dialog = new Dialog(this);
    dialog.setContentView(view);
    dialog.setCancelable(true);
    dialog.show();

}

private void informUserNoDevicesPaired() {
    Builder dialogBuilder = new AlertDialog.Builder(this);
    dialogBuilder.setMessage("Ingen \"Paired\" enheter");
    dialogBuilder.setPositiveButton("Søk", new DialogInterface.OnClickListener() {

        public void onClick(DialogInterface dialog, int arg1) {
            dialog.dismiss();

        }
    });
    dialogBuilder.setOnCancelListener(new OnCancelListener() {

        public void onCancel(DialogInterface dialog) {
            dialog.dismiss();
            finish();
        }
    });
    dialogBuilder.show();
}

private void showError(String message) {
    Builder dialogBuilder = new AlertDialog.Builder(this);
    dialogBuilder.setMessage("Det oppstod en feil i programmet:\n\n" + message);
    dialogBuilder.setOnCancelListener(new OnCancelListener() {

        public void onCancel(DialogInterface dialog) {
            dialog.dismiss();
            finish();
        }
    });
    dialogBuilder.show();
}

private void pairToDevice(BluetoothDevice bluetoothDevice) {
    openSocket(bluetoothDevice);
}

private void openSocket(BluetoothDevice bluetoothDevice) {
    try {

        final ProgressDialog dialog = new ProgressDialog(this);
        final ConnectRunnable connector = new ConnectRunnable(bluetoothDevice, dialog);
        dialog.show(this, "Kobler til", "Koblier til " + bluetoothDevice.getName() + " : " + bluetoothDevice.getAddress(),
                true, true,
                new OnCancelListener() {

                    public void onCancel(DialogInterface dialog) {
                        connector.cancel();
                    }
                });

        new Thread(connector).start();

    } catch (IOException ex) {
        Log.d(logTag, "Could not open bluetooth socket", ex);
        showError("Kunne ikke åpne socket grunnet feil: " + ex.getMessage());
    }
}

private void closeSocket(BluetoothSocket openSocket) {
    try {
        openSocket.close();
    } catch (IOException ex) {
        Log.d(logTag, "Could not close exisiting socket", ex);
    }
}

private void startListeningForInput(BluetoothSocket socket) {
    new Thread(new InputReader(socket)).start();

}

private void dismissDialog(final Dialog dialog) {
    runOnUiThread(new Runnable() {

        public void run() {
            dialog.dismiss();
        }
    });
}

private class ConnectRunnable implements Runnable {

    private final ProgressDialog dialog;
    private final BluetoothSocket socket;

    public ConnectRunnable(BluetoothDevice device, ProgressDialog dialog) throws IOException {
        socket = device.createRfcommSocketToServiceRecord(applicationUUID);
        this.dialog = dialog;
    }

    public void run() {
        try {
            bluetoothAdapter.cancelDiscovery();
            socket.connect();
        } catch (IOException connectException) {
            Log.d(logTag, "Could not connect to socket", connectException);
            closeSocket(socket);
            return;
        }
        startListeningForInput(socket);
        dismissDialog(dialog);
    }

    public void cancel() {
        try {
            socket.close();
        } catch (IOException e) {
            Log.d(logTag, "Canceled connection", e);
        }
    }
}

private class InputReader implements Runnable {

    private final BluetoothSocket socket;

    public InputReader(BluetoothSocket socket) {
        this.socket = socket;

    }

    @Override
    public void run() {
        try {
            final InputStream input = socket.getInputStream();
            final BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
            String line;

            while ((line = bufferedReader.readLine()) != null) {
                lineReadFromBluetoothDevice(line);
            }
        } catch (IOException ex) {
            showError("Mistet forbindelsen: " + ex.getMessage());
        }
    }

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



     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

devicesavailabletextview:

<?xml version="1.0" encoding="UTF-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
</TextView>

Answer 1

问题是我的uuid，我认为这只是一个知道它来自哪里的机器人的uuid，但它必须是“00001101-0000-1000-8000-00805F9B34FB”

Answer 2

条形码扫描器使用SPP协议 - 因此您必须使用SPP UUID连接到它。