按照视频中的代码，运行程序，发现无法连接其他Android设备或者电脑设备

代码如下：package com.example.yoummiegao.bluetoothsocket;

import android.app.Activity;

import android.bluetooth.BluetoothAdapter;

import android.bluetooth.BluetoothDevice;

import android.bluetooth.BluetoothServerSocket;

import android.bluetooth.BluetoothSocket;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.view.View;

import android.view.Window;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.Toast;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.List;

import java.util.Set;

import java.util.UUID;

//import java.util.logging.Handler;

import java.util.logging.LogRecord;

public class MainActivity extends Activity implements AdapterView.OnItemClickListener{

private ListView lvDevices;

private BluetoothAdapter bluetoothAdapter;

private List bluetoothDevices = new ArrayList();

private ArrayAdapter arrayAdapter;

//private final UUID MY_UUID = UUID.fromString("fe09b933-ba57-42b7-a50f-cca4c7cda13e");

private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

private final String NAME = "Bluetooth_Socket";

private BluetoothSocket clientSocket;

private BluetoothDevice device;

private AcceptThread acceptThread;

private OutputStream os;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

setContentView(R.layout.activity_main);

bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

lvDevices = (ListView) findViewById(R.id.lvDevices);

Set piredDevices = bluetoothAdapter.getBondedDevices();

if(piredDevices.size()>0)

{

for(BluetoothDevice device:piredDevices)

{

bluetoothDevices.add(device.getName()+":"+device.getAddress()+"n");

}

}

arrayAdapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,android.R.id.text1,bluetoothDevices);

lvDevices.setAdapter(arrayAdapter);

lvDevices.setOnItemClickListener(this);

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);

this.registerReceiver(receiver, filter);

filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

this.registerReceiver(receiver, filter);

acceptThread = new AcceptThread();

acceptThread.start();

}

public void onClick_Search(View view) {

setProgressBarIndeterminateVisibility(true);

setTitle("正在扫描...");

if (bluetoothAdapter.isDiscovering()) {

bluetoothAdapter.cancelDiscovery();

}

bluetoothAdapter.startDiscovery();

}

private final BroadcastReceiver receiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (BluetoothDevice.ACTION_FOUND.equals(action)) {

BluetoothDevice device = intent

.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

if (device.getBondState() != BluetoothDevice.BOND_BONDED) {

bluetoothDevices.add(device.getName() + ":"

+ device.getAddress() + "n");

arrayAdapter.notifyDataSetChanged();

}

} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED

.equals(action)) {

setProgressBarIndeterminateVisibility(false);

setTitle("连接蓝牙设备");

}

}

};

@Override

public void onItemClick(AdapterView> parent, View view, int position, long id) {

String s = arrayAdapter.getItem(position);

String address = s.substring(s.indexOf(":")+1).trim();

try

{

if(bluetoothAdapter.isDiscovering())

{

bluetoothAdapter.cancelDiscovery();

}

try

{

if(device == null)

{

device = bluetoothAdapter.getRemoteDevice(address);

}

if(clientSocket == null)

{

clientSocket = device.createRfcommSocketToServiceRecord(MY_UUID);

clientSocket.connect();

os = clientSocket.getOutputStream();

}