Android蓝牙通信聊天实现发送和接受功能
短信预约 -IT技能 免费直播动态提醒
很不错的蓝牙通信demo实现发送和接受功能,就用了两个类就实现了，具体内容如下
说下思路把 主要有两个类 主界面类 和 蓝牙聊天服务类 。 首先创建线程 实际上就是创建BluetoothChatService() (蓝牙聊天服务类) 这个时候把handler 传过去 这样就可以操作UI 界面了，在线程中不断轮询读取蓝牙消息，当主界面点击发送按钮时 调用BluetoothChatService 的发送方法write 方法，这里的write 方法 使用了handler 发送消息，在主界面显示，另一个 客户端 不断读取蓝牙消息 类似的有个read 方法 同样显示到界面上去，这样就完成了通信了。
import java.util.ArrayList;
import java.util.Set;
import android.app.Activity;
import android.app.AlertDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class BluetoothChat extends Activity {
// Message types sent from the BluetoothChatService Handler
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
// Key names received from the BluetoothChatService Handler
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
// Intent request codes
private static final int REQUEST_CONNECT_DEVICE = 1;
private static final int REQUEST_ENABLE_BT = 2;
private TextView mTitle;
private EditText text_chat;
private EditText text_input;
private Button but_On_Off;
private Button but_search; // ------> 在菜单中可以搜索
private Button but_create; // ------> 在菜单中设置"可被发现"
private Button mSendButton;
// 连接到的蓝牙设备的名称
private String mConnectedDeviceName;
// String buffer for outgoing messages
private StringBuffer mOutStringBuffer;
// Local Bluetooth adapter
private BluetoothAdapter mBluetoothAdapter = null;
// Member object for the chat services
private BluetoothChatService mChatService = null;
private ArrayList<String> mPairedDevicesList = new ArrayList<String>();
private ArrayList<String> mNewDevicesList = new ArrayList<String>();
private String[] strName;
private String address;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.main);
mTitle = (TextView) this.findViewById(R.id.text_title);
text_chat = (EditText) this.findViewById(R.id.text_chat);
text_input = (EditText) this.findViewById(R.id.text_input);
but_On_Off = (Button) this.findViewById(R.id.but_off_on);
but_search = (Button) this.findViewById(R.id.but_search_div);
but_create = (Button) this.findViewById(R.id.but_cjlj);
mSendButton = (Button) this.findViewById(R.id.but_fsxx);
// 获得本地的蓝牙适配器
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
// 如果为null,说明没有蓝牙设备
if (mBluetoothAdapter == null) {
Toast.makeText(this, "没有蓝牙设备", Toast.LENGTH_LONG).show();
finish();
return;
}
if (mBluetoothAdapter.isEnabled()) {
but_On_Off.setText("关闭蓝牙");
} else {
but_On_Off.setText("开启蓝牙");
}
but_On_Off.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if (!mBluetoothAdapter.isEnabled()) {
mBluetoothAdapter.enable();
Toast.makeText(BluetoothChat.this, "蓝牙已开启",
Toast.LENGTH_SHORT).show();
but_On_Off.setText("关闭蓝牙");
} else {
mBluetoothAdapter.disable();
Toast.makeText(BluetoothChat.this, "蓝牙已关闭",
Toast.LENGTH_SHORT).show();
but_On_Off.setText("开启蓝牙");
}
}
});
but_search.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
searchDevice();
}
});
but_create.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final EditText et = new EditText(BluetoothChat.this);
et.setSingleLine();
et.setText(mBluetoothAdapter.getName());
new AlertDialog.Builder(BluetoothChat.this)
.setTitle("请输入房间名：")
.setView(et)
.setPositiveButton("确定",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
String name = et.getText().toString()
.trim();
if (name.equals("")) {
Toast.makeText(BluetoothChat.this,
"请输入房间名",
Toast.LENGTH_SHORT).show();
return;
}
// 设置房间名
mBluetoothAdapter.setName(name);
}
})
.setNegativeButton("取消",
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
}
}).create().show();
// 创建连接，也就是设备本地蓝牙设备可被其他用户的蓝牙搜到
ensureDiscoverable();
}
});
// 获得一个已经配对的蓝牙设备的set集合
Set<BluetoothDevice> pairedDevices = mBluetoothAdapter
.getBondedDevices();
if (pairedDevices.size() > 0) {
for (BluetoothDevice device : pairedDevices) {
mPairedDevicesList.add("已配对：" + device.getName() + "\n"
+ device.getAddress());
}
} else {
Toast.makeText(this, "没有已配对的设备", Toast.LENGTH_SHORT).show();
}
// 当发现一个新的蓝牙设备时注册广播
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(mReceiver, filter);
// 当搜索完毕后注册广播
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(mReceiver, filter);
}
@Override
public void onStart() {
super.onStart();
// If BT is not on, request that it be enabled.
// setupChat() will then be called during onActivityResult
if (!mBluetoothAdapter.isEnabled()) {
Intent enableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
// Otherwise, setup the chat session
} else {
if (mChatService == null)
setupChat();
}
}
@Override
public synchronized void onResume() {
super.onResume();
// Performing this check in onResume() covers the case in which BT was
// not enabled during onStart(), so we were paused to enable it...
// onResume() will be called when ACTION_REQUEST_ENABLE activity
// returns.
if (mChatService != null) {
// Only if the state is STATE_NONE, do we know that we haven't
// started already
if (mChatService.getState() == BluetoothChatService.STATE_NONE) {
// Start the Bluetooth chat services
mChatService.start();
}
}
}
private void setupChat() {
mSendButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// Send a message using content of the edit text widget
String message = text_input.getText().toString();
sendMessage(message);
}
});
// Initialize the BluetoothChatService to perform bluetooth connections
mChatService = new BluetoothChatService(this, mHandler);
// Initialize the buffer for outgoing messages
mOutStringBuffer = new StringBuffer("");
}
@Override
public void onDestroy() {
super.onDestroy();
// Stop the Bluetooth chat services
if (mChatService != null)
mChatService.stop();
// Make sure we're not doing discovery anymore
if (mBluetoothAdapter != null) {
mBluetoothAdapter.cancelDiscovery();
}
// Unregister broadcast listeners
this.unregisterReceiver(mReceiver);
}
private void ensureDiscoverable() {
if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent discoverableIntent = new Intent(
BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
discoverableIntent.putExtra(
BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
}
}
private void sendMessage(String message) {
// Check that we're actually connected before trying anything
if (mChatService.getState() != BluetoothChatService.STATE_CONNECTED) {
Toast.makeText(this, "没有连接上", Toast.LENGTH_SHORT).show();
return;
}
// Check that there's actually something to send
if (message.length() > 0) {
// Get the message bytes and tell the BluetoothChatService to write
byte[] send = message.getBytes();
mChatService.write(send);
// Reset out string buffer to zero and clear the edit text field
mOutStringBuffer.setLength(0);
text_input.setText(mOutStringBuffer);
}
}
// The Handler that gets information back from the BluetoothChatService
private final Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case BluetoothChatService.STATE_CONNECTED:
mTitle.setText("已经连接");
mTitle.append(mConnectedDeviceName);
// mConversationArrayAdapter.clear();
break;
case BluetoothChatService.STATE_CONNECTING:
mTitle.setText("正在连接中...");
break;
case BluetoothChatService.STATE_LISTEN:
case BluetoothChatService.STATE_NONE:
mTitle.setText("未连接上");
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
// construct a string from the buffer
String writeMessage = new String(writeBuf);
// mConversationArrayAdapter.add("Me: " + writeMessage);
text_chat.append("我：" + writeMessage + "\n");
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
String readMessage = new String(readBuf, 0, msg.arg1);
// mConversationArrayAdapter.add(mConnectedDeviceName+": " +
// readMessage);
text_chat.append(mConnectedDeviceName + "：" + readMessage
+ "\n");
break;
case MESSAGE_DEVICE_NAME:
// save the connected device's name
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Toast.makeText(getApplicationContext(),
"连接到 " + mConnectedDeviceName, Toast.LENGTH_SHORT)
.show();
break;
case MESSAGE_TOAST:
Toast.makeText(getApplicationContext(),
msg.getData().getString(TOAST), Toast.LENGTH_SHORT)
.show();
break;
}
}
};
// 连接蓝牙设备
private void linkDevice() {
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
int cou = mPairedDevicesList.size() + mNewDevicesList.size();
if (cou == 0) {
Toast.makeText(BluetoothChat.this, "没有搜索到可用的蓝牙设备",
Toast.LENGTH_SHORT).show();
return;
}
// 把已经配对的蓝牙设备和新发现的蓝牙设备的名称都放入数组中，以便在对话框列表中显示
strName = new String[cou];
for (int i = 0; i < mPairedDevicesList.size(); i++) {
strName[i] = mPairedDevicesList.get(i);
}
for (int i = mPairedDevicesList.size(); i < strName.length; i++) {
strName[i] = mNewDevicesList.get(i - mPairedDevicesList.size());
}
address = strName[0].substring(strName[0].length() - 17);
new AlertDialog.Builder(BluetoothChat.this)
.setTitle("搜索到的蓝牙设备：")
.setSingleChoiceItems(strName, 0,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
// 当用户点击选中的蓝牙设备时，取出选中的蓝牙设备的MAC地址
address = strName[which].split("\\n")[1].trim();
}
})
.setPositiveButton("连接", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
if (address == null) {
Toast.makeText(BluetoothChat.this, "请先连接外部蓝牙设备",
Toast.LENGTH_SHORT).show();
return;
}
Log.i("sxd", "address:" + address);
// Get the BLuetoothDevice object
BluetoothDevice device = mBluetoothAdapter
.getRemoteDevice(address);
// Attempt to connect to the device
mChatService.connect(device);
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
}).create().show();
}
// 搜索蓝牙设备蓝牙设备
private void searchDevice() {
mTitle.setText("正在努力搜索中...");
setProgressBarIndeterminateVisibility(true);
if (mBluetoothAdapter.isDiscovering()) {
mBluetoothAdapter.cancelDiscovery();
}
mNewDevicesList.clear();
mBluetoothAdapter.startDiscovery();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
menu.add(0, 1, 0, "搜索设备");
menu.add(0, 2, 0, "可被发现");
return true;
}
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// 当发现一个新的蓝牙设备时
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent
.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// If it's already paired, skip it, because it's been listed
// already
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
String s = "未配对： " + device.getName() + "\n"
+ device.getAddress();
if (!mNewDevicesList.contains(s))
mNewDevicesList.add(s);
}
// When discovery is finished, change the Activity title
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED
.equals(action)) {
setProgressBarIndeterminateVisibility(false);
if (mNewDevicesList.size() == 0) {
Toast.makeText(BluetoothChat.this, "没有发现新设备",
Toast.LENGTH_SHORT).show();
}
mTitle.setText("未连接");
linkDevice();
}
}
};
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case 1:
searchDevice();
return true;
case 2:
// Ensure this device is discoverable by others
ensureDiscoverable();
return true;
}
return false;
}
}
package com.it2388.bluetooth;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.UUID;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
public class BluetoothChatService {
// Debugging
private static final String TAG = "BluetoothChatService";
private static final boolean D = true;
// Name for the SDP record when creating server socket 对于SDP记录名称创建服务器套接字时
private static final String NAME = "BluetoothChat";
// Unique UUID for this application
private static final UUID MY_UUID = UUID
.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
// Member fields
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
// Constants that indicate the current connection state
public static final int STATE_NONE = 0; // we're doing nothing 我们什么都不做
public static final int STATE_LISTEN = 1; // now listening for incoming 现在监听
// connections
public static final int STATE_CONNECTING = 2; // now initiating an outgoing
// 启动一个外向
// connection
public static final int STATE_CONNECTED = 3; // now connected to a remote
// 连接到一个远程
// device
public BluetoothChatService(Context context, Handler handler) {
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
private synchronized void setState(int state) {
if (D)
Log.d(TAG, "setState() " + mState + " -> " + state);
mState = state;
// Give the new state to the Handler so the UI Activity can update
mHandler.obtainMessage(BluetoothChat.MESSAGE_STATE_CHANGE, state, -1)
.sendToTarget();
}
public synchronized int getState() {
return mState;
}
public synchronized void start() {
if (D)
Log.d(TAG, "start");
// Cancel any thread attempting to make a connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to listen on a BluetoothServerSocket
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
setState(STATE_LISTEN);
}
public synchronized void connect(BluetoothDevice device) {
if (D)
Log.d(TAG, "connect to: " + device);
// Cancel any thread attempting to make a connection
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Start the thread to connect with the given device
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
public synchronized void connected(BluetoothSocket socket,
BluetoothDevice device) {
if (D)
Log.d(TAG, "connected");
// Cancel the thread that completed the connection
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
// Cancel any thread currently running a connection
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
// Cancel the accept thread because we only want to connect to one
// device
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
// Start the thread to manage the connection and perform transmissions
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
// Send the name of the connected device back to the UI Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
public synchronized void stop() {
if (D)
Log.d(TAG, "stop");
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
setState(STATE_NONE);
}
public void write(byte[] out) {
// Create temporary object
ConnectedThread r;
// Synchronize a copy of the ConnectedThread
synchronized (this) {
if (mState != STATE_CONNECTED)
return;
r = mConnectedThread;
}
// Perform the write unsynchronized
r.write(out);
}
private void connectionFailed() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "不能连接到设备");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
private void connectionLost() {
setState(STATE_LISTEN);
// Send a failure message back to the Activity
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "设备连接中断");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
private class AcceptThread extends Thread {
// The local server socket
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
// Create a new listening server socket
try {
tmp = mAdapter
.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
Log.e("sxd", " ======== ufcomm exception =======", e);
}
mmServerSocket = tmp;
}
public void run() {
if (D)
Log.d(TAG, "BEGIN mAcceptThread" + this);
setName("AcceptThread");
BluetoothSocket socket = null;
// Listen to the server socket if we're not connected
while (mState != STATE_CONNECTED) {
try {
// This is a blocking call and will only return on a
// successful connection or an exception
socket = mmServerSocket.accept();
} catch (IOException e) {
Log.e("sxd", "---> accept socket failed <---", e);
break;
}
// If a connection was accepted
if (socket != null) {
synchronized (BluetoothChatService.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
// Situation normal. Start the connected thread.
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
// Either not ready or already connected. Terminate
// new socket.
try {
socket.close();
} catch (IOException e) {
Log.e(TAG, "Could not close unwanted socket", e);
}
break;
}
}
}
}
if (D)
Log.i(TAG, "END mAcceptThread");
}
public void cancel() {
if (D)
Log.d(TAG, "cancel " + this);
try {
mmServerSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of server failed", e);
}
}
}
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
// Get a BluetoothSocket for a connection with the
// given BluetoothDevice
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
Log.e(TAG, "create() failed", e);
}
mmSocket = tmp;
}
public void run() {
Log.i(TAG, "BEGIN mConnectThread");
setName("ConnectThread");
// Always cancel discovery because it will slow down a connection
mAdapter.cancelDiscovery();
// Make a connection to the BluetoothSocket
try {
// This is a blocking call and will only return on a
// successful connection or an exception
mmSocket.connect();
} catch (IOException e) {
Log.e("sxd", "链接发生了异常", e);
connectionFailed();
// Close the socket
try {
mmSocket.close();
} catch (IOException e2) {
Log.e(TAG,
"unable to close() socket during connection failure",
e2);
}
// Start the service over to restart listening mode
BluetoothChatService.this.start();
return;
}
// Reset the ConnectThread because we're done
synchronized (BluetoothChatService.this) {
mConnectThread = null;
}
// Start the connected thread
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
Log.d(TAG, "create ConnectedThread");
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
// Get the BluetoothSocket input and output streams
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
Log.e(TAG, "temp sockets not created", e);
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
public void run() {
Log.i(TAG, "BEGIN mConnectedThread");
byte[] buffer = new byte[1024];
int bytes;
// Keep listening to the InputStream while connected
while (true) {
try {
// Read from the InputStream
bytes = mmInStream.read(buffer);
// Send the obtained bytes to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes,
-1, buffer).sendToTarget();
} catch (IOException e) {
Log.e(TAG, "disconnected", e);
connectionLost();
break;
}
}
}
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
// Share the sent message back to the UI Activity
mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1,
buffer).sendToTarget();
} catch (IOException e) {
Log.e(TAG, "Exception during write", e);
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
Log.e(TAG, "close() of connect socket failed", e);
}
}
}
}
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