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《安卓网络编程》之第六篇 Android中的WIFI和蓝牙

关于WIFI就不多介绍啦，直接来个段子吧。

问：“WiFi对人体有伤害么？”

答:“不清楚，反正没有WiFi我就浑身不舒服。

比较重要的一点就是WifiManager wm=(WifiManager)Android_Wifi.this.getSystemService(Context.WIFI_SERVICE);

关闭打开搜索都可以通过调用wm的相关方法实现。可能要开发wifi万能钥匙那一类的程序才用到这个吧，普通应用程序主要就识别是wifi网络还是移动网络。不多讲

代码参考博客：http://blog.csdn.net/sbvfhp/article/details/7007090

重点蓝牙：

　一：什么是蓝牙

　　　　1：Bluetooth是目前使用最广泛的无线通讯协议，近距离无线通讯的标准。传说瑞典有个国王特别爱吃蓝莓导致自己的牙齿天天都是蓝色的，在他执政期间这位国王非常善于交际，能说会到，和邻国的搞得关系非常好，这个Bluetooth的发明者觉得蓝牙它的作用就是在近距离沟通周围的设备，跟这个国王很类似，于是起名叫蓝牙。

　　　　2：主要针对短距离设备通讯（10米）

　　　　3：无线耳机，无线鼠标，无线键盘

蓝牙标志

　二：蓝牙工作流程图

　　　　首先两个设备上都要有蓝牙设备或者专业一点叫蓝牙适配器，以手机和电脑为例我画了如下流程图。其次在手机上进行扫描，扫描周围蓝蓝牙设备，先找到手机附近的电脑，然后给它发出一个信号需要进行蓝牙的配对，再次返回一个信号说明手机和电脑已经配对成功了，最后配对成功后可以进行文件传输了。这是一个最基本的一个流程。

　　三：蓝牙开发相关类

　　在Android手机中开发蓝牙程序时，离不开几个类：

BluetoothSocket：close() connect() getInputStream()......

BluetoothServerSocket : accept()

BlutoothAdapter :代表本地的蓝牙适配器设备，通过此类可以让用户能执行基本的蓝牙任务。

BluetoothClass: 代表了一个描述设备通用特性和功能的蓝牙类。比如一个蓝牙类会指定如电话、计算机或耳机的通用设备类型。

BluetoothClass.Service:

BluetoothClass.Device：

BluetoothClass.Device.Major: 定义了主要设备类的常量

其中与蓝牙相关的最重要的两个API

　　　1：BuletoothAdapter

　　这个类的对象代表了本地的蓝牙适配器，相当于蓝牙工作流程图中的手机里的蓝牙适配器，也就是说比如这个应用程序是运行在手机上，那么手机上的蓝牙适配器就是本地蓝牙适配器。

　　　2：BuletoothDevice

　　　这个类的对象代表了远程的蓝牙设备，相当于蓝牙工作流程图中的计算机里的蓝牙适配器，也就是说比如这个应用程序是运行在手机上，那么BuletoothDevice代表了你要连接的远程的那个设备上面的蓝牙适配器。

四：蓝牙开发步骤：

此部分转载于 http://zhouyunan2010.iteye.com/blog/1186021

从查找蓝牙设备到能够相互通信要经过几个基本步骤(本机做为服务器)：
1.设置权限
在manifest中配置

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

2.启动蓝牙
首先要查看本机是否支持蓝牙，获取BluetoothAdapter蓝牙适配器对象

BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(mBluetoothAdapter == null){
        //表明此手机不支持蓝牙
        return;
}
if(!mBluetoothAdapter.isEnabled()){    //蓝牙未开启，则开启蓝牙
            Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableIntent, REQUEST_ENABLE_BT);
}
//......
public void onActivityResult(int requestCode, int resultCode, Intent data){
       if(requestCode == REQUEST_ENABLE_BT){
              if(requestCode == RESULT_OK){
                   //蓝牙已经开启 
              }
       }
}

3。发现蓝牙设备
这里可以细分为几个方面
(1)使本机蓝牙处于可见(即处于易被搜索到状态)，便于其他设备发现本机蓝牙

//使本机蓝牙在300秒内可被搜索
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);
        }
}

(2)查找已经配对的蓝牙设备，即以前已经配对过的设备

        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
        if (pairedDevices.size() > 0) {
            findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
            for (BluetoothDevice device : pairedDevices) {
                //device.getName() +" "+ device.getAddress());
            }
        } else {
            mPairedDevicesArrayAdapter.add("没有找到已匹对的设备");
        }

(3)通过mBluetoothAdapter.startDiscovery();搜索设备，要获得此搜索的结果需要注册
一个BroadcastReceiver来获取。先注册再获取信息，然后处理

//注册，当一个设备被发现时调用onReceive
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        this.registerReceiver(mReceiver, filter);

//当搜索结束后调用onReceive
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        this.registerReceiver(mReceiver, filter);
//.......
private BroadcastReceiver mReceiver = 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);
                  // 已经配对的则跳过
                 if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
                      mNewDevicesArrayAdapter.add(device.getName() + "
" + device.getAddress());  //保存设备地址与名字
                 }
            }else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {  //搜索结束
                if (mNewDevicesArrayAdapter.getCount() == 0) {
                    mNewDevicesArrayAdapter.add("没有搜索到设备");
                }
            }

        }
};

4.建立连接
查找到设备后，则需要建立本机与其他设备之间的连接。
一般用本机搜索其他蓝牙设备时，本机可以作为一个服务端，接收其他设备的连接。
启动一个服务器端的线程，死循环等待客户端的连接，这与ServerSocket极为相似。
这个线程在准备连接之前启动

//UUID可以看做一个端口号
private static final UUID MY_UUID =
        UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
   //像一个服务器一样时刻监听是否有连接建立
    private class AcceptThread extends Thread{
        private BluetoothServerSocket serverSocket;
        
        public AcceptThread(boolean secure){
            BluetoothServerSocket temp = null;
            try {
                temp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(
                            NAME_INSECURE, MY_UUID);
            } catch (IOException e) {
                  Log.e("app", "listen() failed", e);
            }
            serverSocket = temp;
        }
        
        public void run(){
            BluetoothSocket socket=null;
            while(true){
                try {
                    socket = serverSocket.accept();
                } catch (IOException e) {
                     Log.e("app", "accept() failed", e);
                     break;
                }
            }
            if(socket!=null){
                //此时可以新建一个数据交换线程，把此socket传进去
            }
        }
        
        //取消监听
        public void cancel(){    
            try {
                serverSocket.close();
            } catch (IOException e) {
                Log.e("app", "Socket Type" + socketType + "close() of server failed", e);
            }
        }

}

View Code

5.交换数据

搜索到设备后可以获取设备的地址，通过此地址获取一个BluetoothDeviced对象，可以看做客户端，通过此对象device.createRfcommSocketToServiceRecord(MY_UUID);同一个UUID可与服务器建立连接获取另一个socket对象，由此服务端与客户端各有一个socket对象，此时
他们可以互相交换数据了。
创立客户端socket可建立线程

    //另一个设备去连接本机,相当于客户端
    private class ConnectThread extends Thread{
        private BluetoothSocket socket;
        private BluetoothDevice device;
        public ConnectThread(BluetoothDevice device,boolean secure){
            this.device = device;
            BluetoothSocket tmp = null;
            try {
                tmp = device.createRfcommSocketToServiceRecord(MY_UUID_SECURE);
            } catch (IOException e) {
                 Log.e("app", "create() failed", e);
            }
        }
        
        public void run(){
            mBluetoothAdapter.cancelDiscovery();    //取消设备查找
            try {
                socket.connect();
            } catch (IOException e) {
                try {
                    socket.close();
                } catch (IOException e1) {
                     Log.e("app", "unable to close() "+
                                " socket during connection failure", e1);
                }
                connetionFailed();    //连接失败
                return;
            }
            //此时可以新建一个数据交换线程，把此socket传进去
        }
        
          public void cancel() {
              try {
                  socket.close();
              } catch (IOException e) {
                  Log.e("app", "close() of connect  socket failed", e);
              }
          }
    }

View Code

6.建立数据通信线程，进行读取数据

//建立连接后，进行数据通信的线程
    private class ConnectedThread extends Thread{
        private BluetoothSocket socket;
        private InputStream inStream;
        private OutputStream outStream;
        
        public ConnectedThread(BluetoothSocket socket){
            
            this.socket = socket;
            try {
                //获得输入输出流
                inStream = socket.getInputStream();
                outStream = socket.getOutputStream();
            } catch (IOException e) {
                Log.e("app", "temp sockets not created", e);
            }
        }
        
        public void run(){
            byte[] buff = new byte[1024];
            int len=0;
            //读数据需不断监听，写不需要
            while(true){
                try {
                    len = inStream.read(buff);
                    //把读取到的数据发送给UI进行显示
                    Message msg = handler.obtainMessage(BluetoothChat.MESSAGE_READ,
                            len, -1, buff);
                    msg.sendToTarget();
                } catch (IOException e) {
                    Log.e("app", "disconnected", e);
                    connectionLost();    //失去连接
                    start();    //重新启动服务器
                    break;
                }
            }
        }
        
        
        public void write(byte[] buffer) {
            try {
                outStream.write(buffer);

                // Share the sent message back to the UI Activity
                handler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer)
                        .sendToTarget();
            } catch (IOException e) {
                Log.e("app", "Exception during write", e);
            }
        }

        public void cancel() {
            try {
                socket.close();
            } catch (IOException e) {
                Log.e("app", "close() of connect socket failed", e);
            }
        }
    }

到这里，蓝牙通信的基本操作已经全部完成。

五：蓝牙聊天室开发

源码参考 http://download.csdn.net/detail/mr_raptor/8033951#comment

此demo界面优美，实现基本功能，但不能保存聊天记录，黑屏自动断线，在此基础做出修改。

保存和恢复activity的状态数据

自己修改说明：

ChatActivity加入再按一次退出功能，更加人性化。加入消息记录功能。

消息记录实现概述：当在服务中开始收发发送消息时，就通过mActivityHandler通知ChatActivity，完成数据库读写操作。

ChatActivity.java:

  1 package cn.com.farsgiht.bluetoothdemo;
  2 
  3 import java.text.SimpleDateFormat;
  4 import java.util.ArrayList;
  5 import java.util.HashMap;
  6 import android.app.Activity;
  7 import android.app.AlertDialog;
  8 import android.bluetooth.BluetoothAdapter;
  9 import android.bluetooth.BluetoothDevice;
 10 import android.content.ContentValues;
 11 import android.content.Context;
 12 import android.content.DialogInterface;
 13 import android.content.DialogInterface.OnClickListener;
 14 import android.content.Intent;
 15 import android.database.sqlite.SQLiteDatabase;
 16 import android.graphics.Bitmap;
 17 import android.graphics.BitmapFactory;
 18 import android.os.Bundle;
 19 import android.os.Handler;
 20 import android.os.Message;
 21 import android.text.Spannable;
 22 import android.text.SpannableString;
 23 import android.text.style.ImageSpan;
 24 import android.util.DisplayMetrics;
 25 import android.util.Log;
 26 import android.view.Display;
 27 import android.view.Gravity;
 28 import android.view.KeyEvent;
 29 import android.view.LayoutInflater;
 30 import android.view.Menu;
 31 import android.view.MenuInflater;
 32 import android.view.MenuItem;
 33 import android.view.View;
 34 import android.view.ViewGroup;
 35 import android.view.inputmethod.InputMethodManager;
 36 import android.widget.AdapterView;
 37 import android.widget.AdapterView.OnItemClickListener;
 38 import android.widget.Button;
 39 import android.widget.EditText;
 40 import android.widget.GridView;
 41 import android.widget.ImageView;
 42 import android.widget.LinearLayout;
 43 import android.widget.LinearLayout.LayoutParams;
 44 import android.widget.ListView;
 45 import android.widget.SimpleAdapter;
 46 import android.widget.Toast;
 47 import cn.com.farsgiht.bluetoothdemo.UI.ChatListViewAdapter;
 48 import cn.com.farsgiht.bluetoothdemo.UI.DrawerHScrollView;
 49 import cn.com.farsgiht.bluetoothdemo.sound.SoundEffect;
 50 import cn.com.farsgiht.bluetoothdemo.task.Task;
 51 import cn.com.farsgiht.bluetoothdemo.task.TaskService;
 52 import cn.com.farsgiht.bluetoothdemo.utils.Utils;
 53 
 54 public class ChatActivity extends Activity implements View.OnClickListener{
 55     private final String TAG = "ChatActivity";
 56     public static int sAliveCount = 0;
 57     public static final String EXTRA_MESSAGER = "cn.com.farsgiht.bluetoothdemo.BUNDLE";
 58     public static final String DEVICE_NAME = "device_name";
 59     // 蓝牙状态变量
 60     private static int sBTState = -1;
 61     
 62     private final int REQUES_BT_ENABLE_CODE = 123;
 63     private final int REQUES_SELECT_BT_CODE = 222;
 64     
 65     private ListView mList;
 66     private EditText mInput;
 67     private Button mSendBtn;
 68     private ImageView mEmoButton;
 69     private GridView mGridView;
 70     private boolean isUpdate = false;
 71     private BluetoothDevice mRemoteDevice;
 72     
 73     private LinearLayout mRootLayout, mChatLayout;
 74     
 75     private View mEmoView;
 76     private boolean isShowEmo = false;
 77     private boolean isHaspressed = false;
 78     private int mScrollHeight;
 79     
 80     private DrawerHScrollView mScrollView;
 81     private ChatListViewAdapter mAdapter2;
 82     private ArrayList<HashMap<String, Object>> mChatContent2 = new ArrayList<HashMap<String, Object>>();
 83     private BluetoothAdapter mBluetoothAdapter;
 84     
 85     private ArrayList<HashMap<String, Object>> mEmoList = new ArrayList<HashMap<String, Object>>();
 86      // 已连接设备的名字
 87     private String mConnectedDeviceName = null;
 88     
 89     private Handler mHandler = new Handler(){
 90         @Override
 91         public void handleMessage(Message msg) {
 92             //设置聊天信息的时间
 93             SimpleDateFormat df0 = new SimpleDateFormat("MM-dd HH:mm:ss");
 94             String pdate=df0.format(System.currentTimeMillis()).toString();            
 95             switch(msg.what){
 96             case -1:
 97                 showToast("没有连接其它用户，点击"Menu"扫描并选择周国用户");
 98                 SoundEffect.getInstance(ChatActivity.this).play(SoundEffect.SOUND_ERR);
 99                 break;
100             case Task.TASK_SEND_MSG:
101 //               showToast(msg.obj.toString());
102                String writeMessage = msg.obj.toString();
103                if(writeMessage!=null && isHaspressed)
104                {
105                    //将发送的信息插入到数据库
106                    ContentValues values=new ContentValues();
107                    values.put("name", "我");
108                    values.put("pdate",pdate);
109                    values.put("informations", writeMessage);
110                    //创建数据库
111                    DatabaseHelper insertdbHelper=new DatabaseHelper(ChatActivity.this,"zhsf_db");
112                    SQLiteDatabase insertdb=insertdbHelper.getWritableDatabase();
113                    insertdb.insert("info", null, values);
114                }
115                 if(sAliveCount <= 0){
116                     Utils.notifyMessage(ChatActivity.this, msg.obj.toString(), ChatActivity.this);
117                 }              
118                 break;    
119             case Task.TASK_RECV_MSG:    
120                String readMessage =((HashMap<String,Object>) msg.obj).get(ChatListViewAdapter.KEY_TEXT).toString();
121                mConnectedDeviceName = ((HashMap<String,Object>) msg.obj).get(ChatListViewAdapter.KEY_NAME).toString(); 
122                if(readMessage!=null)
123                {
124                    //将接受的信息插入到数据库
125                    ContentValues values2=new ContentValues();
126                    values2.put("name", mConnectedDeviceName);
127                    values2.put("pdate",pdate);
128                    values2.put("informations", readMessage);
129                    DatabaseHelper insertdbHelper2=new DatabaseHelper(ChatActivity.this,"zhsf_db");
130                    SQLiteDatabase insertdb2=insertdbHelper2.getWritableDatabase();
131                    insertdb2.insert("info", null, values2);         
132                }
133                 
134                 if(msg.obj == null)
135                     return;
136                 if(msg.obj instanceof HashMap<?, ?>){
137                     showTargetMessage((HashMap<String, Object>) msg.obj);                    
138                 }        
139                 if(sAliveCount <= 0){
140                     Utils.notifyMessage(ChatActivity.this, "您有未读取消息", ChatActivity.this);
141                 }                              
142                 break;
143             case Task.TASK_GET_REMOTE_STATE:
144                 setTitle((String)msg.obj);
145                 if(sAliveCount <= 0){
146                     if(isBTStateChanged(msg.arg1) && msg.arg1 != TaskService.BT_STAT_WAIT)
147                         Utils.notifyMessage(ChatActivity.this, (String)msg.obj, ChatActivity.this);
148                 }
149                 break;
150     
151             }
152         }
153     };
154     
155     @Override
156     protected void onCreate(Bundle savedInstanceState) {
157         super.onCreate(savedInstanceState);
158         setContentView(R.layout.activity_chat);
159         
160         // 获得蓝牙管理器
161         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); 
162         if (mBluetoothAdapter == null) {
163             Log.e(TAG, "Your device is not support Bluetooth!");
164             Toast.makeText(this, "该设备没有蓝牙设备", Toast.LENGTH_LONG).show();
165             return;
166         }
167         
168         mRootLayout = (LinearLayout) findViewById(R.id.root);
169         mChatLayout = (LinearLayout) findViewById(R.id.topPanel);
170         mList = (ListView) findViewById(R.id.listView1);
171     
172         mAdapter2 = new ChatListViewAdapter(this, mChatContent2);
173         
174         mList.setAdapter(mAdapter2);
175 
176         // 初始化表情
177         mEmoView = initEmoView();
178         
179         mInput = (EditText) findViewById(R.id.inputEdit);
180         mInput.setOnClickListener(new android.view.View.OnClickListener() {
181             @Override
182             public void onClick(View v) {
183                 // 点击输入框后，隐藏表情，显示输入法
184                 InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); 
185                 imm.showSoftInput(mInput, 0);
186                 showEmoPanel(false);
187             }
188         });
189         
190         mSendBtn = (Button) findViewById(R.id.sendBtn);
191         mEmoButton = (ImageView) findViewById(R.id.emotionBtn);
192         
193         mSendBtn.setOnClickListener(this);
194         mEmoButton.setOnClickListener(this);
195         
196         //---------------------------------------------------------------------
197         // 打开蓝牙设备
198         if (!mBluetoothAdapter.isEnabled()) {
199             Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
200             startActivityForResult(enableBtIntent, REQUES_BT_ENABLE_CODE); 
201         }else{
202             // 默认设备作为服务端
203             startServiceAsServer();
204         }
205         //---------------------------------------------------------------------
206     }
207     
208     private View initEmoView(){
209         if(mEmoView == null){
210             LayoutInflater inflater = getLayoutInflater();
211             mEmoView = inflater.inflate(R.layout.emo_layout, null);
212             
213             mScrollView = (DrawerHScrollView) mEmoView.findViewById(R.id.scrollView);
214             mGridView = (GridView) mEmoView.findViewById(R.id.gridView);
215             mGridView.setOnItemClickListener(new OnItemClickListener() {
216                 @Override
217                 public void onItemClick(AdapterView<?> parent, View view,
218                         int position, long id) {
219                     // 在android中要显示图片信息，必须使用Bitmap位图的对象来装载  
220                     Bitmap bitmap = BitmapFactory.decodeResource(getResources(), (Integer) mEmoList.get(position).get("img")); 
221                     ImageSpan imageSpan = new ImageSpan(ChatActivity.this, bitmap);  
222                     SpannableString spannableString = new SpannableString((String) mEmoList.get(position).get("text"));//face就是图片的前缀名  
223                     spannableString.setSpan(imageSpan, 0, 8,Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);  
224                     mInput.append(spannableString);
225                     System.out.println("mInput:"+mInput.getText());
226                 }
227             });
228 
229             mScrollHeight = setScrollGridView(mScrollView, mGridView, 3);
230             System.out.println("mScrollHeight:" + mScrollHeight);
231         }
232         return mEmoView;
233     }
234     
235 
236     
237     private void startServiceAsServer(){
238         TaskService.start(this, mHandler);
239         TaskService.newTask(new Task(mHandler, Task.TASK_START_ACCEPT, null));
240         SoundEffect.getInstance(this).play(SoundEffect.SOUND_PLAY);
241     }
242     
243     @Override
244     protected void onResume() {
245         sAliveCount++;
246         super.onResume();
247     }
248 
249     @Override
250     protected void onPause() {
251         sAliveCount--;
252         super.onPause();
253     }
254     
255     @Override
256     protected void onDestroy() {
257         super.onDestroy();
258         // 关闭蓝牙
259         if(mBluetoothAdapter.isEnabled())
260             mBluetoothAdapter.disable();
261         // 停止服务
262         TaskService.stop(this);
263     }
264     
265     
266     @Override
267     public void onClick(View v) {
268         if(v == mSendBtn){
269             String msg = mInput.getText().toString().trim();
270             TaskService.newTask(new Task(mHandler, Task.TASK_GET_REMOTE_STATE, null));//通过点击按钮触发相应线程的启动，比较巧妙，值得学习
271             if(msg.length() == 0){
272                 showToast("聊天内容为空");
273                 SoundEffect.getInstance(ChatActivity.this).play(SoundEffect.SOUND_ERR);
274                 return;
275             }
276             
277             //------ DEUBG ------ 
278             TaskService.newTask(new Task(mHandler, Task.TASK_SEND_MSG, new Object[]{msg}));
279             showOwnMessage(msg);//立马显示自己发送的消息，所以在handler里面就没有再做处理
280             isHaspressed = true;//数据库可以开始记录消息啦
281             mInput.setText("");
282         }else if(v == mEmoButton){
283             System.out.println("Emo btn clicked");
284             // 关闭输入法
285             InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE); 
286             imm.hideSoftInputFromWindow(mInput.getWindowToken(),0);
287             if(isShowEmo){
288                 showEmoPanel(false);
289             }else{
290                 showEmoPanel(true);
291             }
292         }
293     }
294     
295     private void showEmoPanel(boolean show){
296         if(show && !isShowEmo){
297             mEmoView.setVisibility(View.VISIBLE);
298             mEmoButton.setImageResource(R.drawable.emo_collapse);
299             ViewGroup.LayoutParams params = mChatLayout.getLayoutParams();
300             params.height = mChatLayout.getHeight() - mScrollHeight;
301             mChatLayout.setLayoutParams(params);
302             isShowEmo = true;
303         }else if(!show && isShowEmo){
304             mEmoView.setVisibility(View.GONE);
305             mEmoButton.setImageResource(R.drawable.emo_bkg);
306             ViewGroup.LayoutParams params = mChatLayout.getLayoutParams();
307             params.height = mChatLayout.getHeight() + mScrollHeight;
308             mChatLayout.setLayoutParams(params);
309             isShowEmo = false;
310         }
311         if(!isUpdate && show){
312             LinearLayout.LayoutParams para = new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);
313             mRootLayout.addView(mEmoView, para);
314             isUpdate = true;
315         }
316     }
317     
318     
319     
320     private boolean isBTStateChanged(int now){
321         if(sBTState != now){
322             sBTState = now;
323             return true;
324         }else{
325             return false;
326         }
327     }
328     
329     /**
330      * 显示对方信息
331      * @param data
332      */
333     private void showTargetMessage(HashMap<String, Object> data){
334         SimpleDateFormat df1 = new SimpleDateFormat("E MM月dd日   HH:mm ");
335         data.put(ChatListViewAdapter.KEY_DATE, df1.format(System.currentTimeMillis()).toString());
336         data.put(ChatListViewAdapter.KEY_SHOW_MSG, true);
337         mChatContent2.add(data);
338         mAdapter2.notifyDataSetChanged();
339         SoundEffect.getInstance(ChatActivity.this).play(SoundEffect.SOUND_RECV);
340     }
341     
342     /**
343      * 显示自己信息
344      * @param data
345      */
346     private void showOwnMessage(String msg){
347         HashMap<String, Object> map = new HashMap<String, Object>();
348         map.put(ChatListViewAdapter.KEY_ROLE, ChatListViewAdapter.ROLE_OWN);//哪个角色的消息
349         map.put(ChatListViewAdapter.KEY_NAME, mBluetoothAdapter.getName());
350         map.put(ChatListViewAdapter.KEY_TEXT, msg);
351         SimpleDateFormat df2 = new SimpleDateFormat("E MM月dd日  HH:mm ");
352         map.put(ChatListViewAdapter.KEY_DATE, df2.format(System.currentTimeMillis()).toString());
353         map.put(ChatListViewAdapter.KEY_SHOW_MSG, true);
354         mChatContent2.add(map);
355         mAdapter2.notifyDataSetChanged();
356         SoundEffect.getInstance(ChatActivity.this).play(SoundEffect.SOUND_SEND);
357     }
358 
359     @Override
360     public boolean onCreateOptionsMenu(Menu menu) {
361          MenuInflater inflater = getMenuInflater();
362          inflater.inflate(R.menu.option_menu, menu);
363          return true;
364     }
365 
366     @Override
367     public boolean onOptionsItemSelected(MenuItem item) {
368           switch (item.getItemId()) {
369             case R.id.scan:
370                 startActivityForResult(new Intent(this, SelectDevice.class), REQUES_SELECT_BT_CODE);
371                 break;
372             case R.id.discoverable:
373                 // 调用设置用户名方法
374                 AlertDialog.Builder dlg = new AlertDialog.Builder(this);
375                 final EditText devNameEdit = new EditText(this);
376                 dlg.setView(devNameEdit);
377                 dlg.setTitle("请输入用户名");
378                 dlg.setPositiveButton("设置", new OnClickListener() {
379                     public void onClick(DialogInterface dialog, int which) {
380                         if(devNameEdit.getText().toString().length() != 0)
381                             mBluetoothAdapter.setName(devNameEdit.getText().toString());
382                     }
383                 });
384                 dlg.create();
385                 dlg.show();
386                 return true;
387             case R.id.record:
388                 Intent recordIntent = new Intent(ChatActivity.this, RecordListActivity.class);
389                 startActivity(recordIntent);
390                 return true;
391             case R.id.exit:
392                 Intent aboutIntent = new Intent(ChatActivity.this, DownloadActivity.class);
393                 startActivity(aboutIntent);
394                 return true;
395             }
396             return false;
397     }
398 
399     @Override
400     protected void onActivityResult(int requestCode, int resultCode, Intent data) {
401         if(requestCode == REQUES_BT_ENABLE_CODE && resultCode == RESULT_OK){
402             startServiceAsServer();
403         }else if(requestCode == REQUES_SELECT_BT_CODE && resultCode == RESULT_OK){
404             mRemoteDevice = data.getParcelableExtra("DEVICE");
405             if(mRemoteDevice == null)
406                 return;
407             TaskService.newTask(new Task(mHandler, Task.TASK_START_CONN_THREAD, new Object[]{mRemoteDevice}));
408         }
409         super.onActivityResult(requestCode, resultCode, data);
410     }
411     
412     private void showToast(String msg){
413         Toast tst = Toast.makeText(this, msg, Toast.LENGTH_SHORT);
414         tst.setGravity(Gravity.CENTER | Gravity.TOP, 0, 240);
415         tst.show();
416     }
417     
418     
419     // 设置表情的多页滚动显示控件
420     public int setScrollGridView(DrawerHScrollView scrollView, GridView gridView, 
421             int lines) {
422         
423         DisplayMetrics dm = new DisplayMetrics();
424         getWindowManager().getDefaultDisplay().getMetrics(dm); 
425         Display display = getWindowManager().getDefaultDisplay();
426         System.out.println("Width:" + display.getWidth());
427         System.out.println("Height:" + display.getHeight());
428 
429         
430         int scrollWid = display.getWidth();
431         int scrollHei;
432         System.out.println("scrollWid:" + scrollWid);
433         if (scrollWid <= 0 ){
434             Log.d(TAG, "scrollWid or scrollHei is less than 0");
435             return 0;
436         }
437          
438           
439         float density  = dm.density;      // 屏幕密度（像素比例：0.75/1.0/1.5/2.0）
440         
441         int readlViewWidht = 56;
442         // 图片都放在了Hdpi中，所以计算出图片的像素独立宽度
443         int viewWidth = (int) (readlViewWidht * density / 1.5);
444         int viewHeight = viewWidth;
445         System.out.println("viewWidth:" + viewWidth + " viewHeight:" + viewHeight);
446         
447         int numColsPage = scrollWid / viewWidth;
448         int spaceing = (scrollWid - viewWidth * numColsPage)/(numColsPage);
449         System.out.println("Space:" + spaceing);
450 
451 
452         SimpleAdapter adapter = getEmoAdapter();
453         int pages = adapter.getCount() / (numColsPage * lines);
454         
455         if (pages * numColsPage * lines < adapter.getCount()){
456             pages++;
457         }
458 
459         System.out.println("pages:" + pages);
460         
461         scrollHei = lines * viewHeight + spaceing * (lines + 1);
462         
463         LayoutParams params = new LayoutParams(pages * scrollWid, LayoutParams.WRAP_CONTENT);
464         gridView.setLayoutParams(params);
465         gridView.setColumnWidth(viewWidth);
466         gridView.setHorizontalSpacing(spaceing);
467         gridView.setVerticalSpacing(spaceing);
468         gridView.setStretchMode(GridView.NO_STRETCH);
469         gridView.setNumColumns(numColsPage * pages);
470 
471         //adapter = new DrawerListAdapter(this, colWid, colHei);
472         //listener = new DrawerItemClickListener();
473         gridView.setAdapter(adapter);
474         //mGridView.setOnItemClickListener(listener);
475 
476         scrollView.setParameters(pages, 0, scrollWid, spaceing);
477         //updateDrawerPageLayout(pageNum, 0);
478         // 表情区域还要加上分布显示区
479         int pageNumHei = (int) (18 * density); 
480         return scrollHei + pageNumHei;
481     }
482     
483         
484     private SimpleAdapter getEmoAdapter(){
485            HashMap<String, Object> map = new HashMap<String, Object>();
486            map.put("img", R.drawable.emo001);
487            map.put("text", "<emo001>");
488            mEmoList.add(map);
489            map = new HashMap<String, Object>();
490            map.put("img", R.drawable.emo002);
491            map.put("text", "<emo002>");
492            mEmoList.add(map);
493            map = new HashMap<String, Object>();
494            map.put("img", R.drawable.emo003);
495            map.put("text", "<emo003>");
496            mEmoList.add(map);
497            map = new HashMap<String, Object>();
498            map.put("img", R.drawable.emo004);
499            map.put("text", "<emo004>");
500            mEmoList.add(map);
501            map = new HashMap<String, Object>();
502            map.put("img", R.drawable.emo005);
503            map.put("text", "<emo005>");
504            mEmoList.add(map);
505            map = new HashMap<String, Object>();
506            map.put("img", R.drawable.emo006);
507            map.put("text", "<emo006>");
508            mEmoList.add(map);
509            map = new HashMap<String, Object>();
510            map.put("img", R.drawable.emo007);
511            map.put("text", "<emo007>");
512            mEmoList.add(map);
513            map = new HashMap<String, Object>();
514            map.put("img", R.drawable.emo008);
515            map.put("text", "<emo008>");
516            mEmoList.add(map);
517            map = new HashMap<String, Object>();
518            map.put("img", R.drawable.emo009);
519            map.put("text", "<emo009>");
520            mEmoList.add(map);
521            map = new HashMap<String, Object>();
522            map.put("img", R.drawable.emo010);
523            map.put("text", "<emo010>");
524            mEmoList.add(map);
525            map = new HashMap<String, Object>();
526            map.put("img", R.drawable.emo011);
527            map.put("text", "<emo011>");
528            mEmoList.add(map);
529            map = new HashMap<String, Object>();
530            map.put("img", R.drawable.emo012);
531            map.put("text", "<emo012>");
532            mEmoList.add(map);
533            map = new HashMap<String, Object>();
534            map.put("img", R.drawable.emo013);
535            map.put("text", "<emo013>");
536            mEmoList.add(map);
537            map = new HashMap<String, Object>();
538            map.put("img", R.drawable.emo014);
539            map.put("text", "<emo014>");
540            mEmoList.add(map);
541            map = new HashMap<String, Object>();
542            map.put("img", R.drawable.emo015);
543            map.put("text", "<emo015>");
544            mEmoList.add(map);
545            map = new HashMap<String, Object>();
546            map.put("img", R.drawable.emo016);
547            map.put("text", "<emo016>");
548            mEmoList.add(map);
549            map = new HashMap<String, Object>();
550            map.put("img", R.drawable.emo017);
551            map.put("text", "<emo017>");
552            mEmoList.add(map);
553            map = new HashMap<String, Object>();
554            map.put("img", R.drawable.emo018);
555            map.put("text", "<emo018>");
556            mEmoList.add(map);
557            map = new HashMap<String, Object>();
558            map.put("img", R.drawable.emo019);
559            map.put("text", "<emo019>");
560            mEmoList.add(map);
561            map = new HashMap<String, Object>();
562            map.put("img", R.drawable.emo020);
563            map.put("text", "<emo020>");
564            mEmoList.add(map);
565            map = new HashMap<String, Object>();
566            map.put("img", R.drawable.emo021);
567            map.put("text", "<emo021>");
568            mEmoList.add(map);
569            map = new HashMap<String, Object>();
570            map.put("img", R.drawable.emo022);
571            map.put("text", "<emo022>");
572            mEmoList.add(map);
573            map = new HashMap<String, Object>();
574            map.put("img", R.drawable.emo023);
575            map.put("text", "<emo023>");
576            mEmoList.add(map);
577            map = new HashMap<String, Object>();
578            map.put("img", R.drawable.emo024);
579            map.put("text", "<emo024>");
580            mEmoList.add(map);
581            map = new HashMap<String, Object>();
582            map.put("img", R.drawable.emo025);
583            map.put("text", "<emo025>");
584            mEmoList.add(map);
585            map = new HashMap<String, Object>();
586            map.put("img", R.drawable.emo026);
587            map.put("text", "<emo026>");
588            mEmoList.add(map);
589            map = new HashMap<String, Object>();
590            map.put("img", R.drawable.emo027);
591            map.put("text", "<emo027>");
592            mEmoList.add(map);
593            map = new HashMap<String, Object>();
594            map.put("img", R.drawable.emo028);
595            map.put("text", "<emo028>");
596            mEmoList.add(map);
597            map = new HashMap<String, Object>();
598            map.put("img", R.drawable.emo029);
599            map.put("text", "<emo029>");
600            mEmoList.add(map);
601            map = new HashMap<String, Object>();
602            map.put("img", R.drawable.emo030);
603            map.put("text", "<emo030>");
604            mEmoList.add(map);
605            map = new HashMap<String, Object>();
606            map.put("img", R.drawable.emo031);
607            map.put("text", "<emo031>");
608            mEmoList.add(map);
609            map = new HashMap<String, Object>();
610            map.put("img", R.drawable.emo032);
611            map.put("text", "<emo032>");
612            mEmoList.add(map);
613            map = new HashMap<String, Object>();
614            map.put("img", R.drawable.emo033);
615            map.put("text", "<emo033>");
616            mEmoList.add(map);
617            map = new HashMap<String, Object>();
618            map.put("img", R.drawable.emo034);
619            map.put("text", "<emo034>");
620            mEmoList.add(map);
621            map = new HashMap<String, Object>();
622            map.put("img", R.drawable.emo035);
623            map.put("text", "<emo035>");
624            mEmoList.add(map);
625            map = new HashMap<String, Object>();
626            map.put("img", R.drawable.emo036);
627            map.put("text", "<emo036>");
628            mEmoList.add(map);
629            map = new HashMap<String, Object>();
630            map.put("img", R.drawable.emo037);
631            map.put("text", "<emo037>");
632            mEmoList.add(map);
633            map = new HashMap<String, Object>();
634            map.put("img", R.drawable.emo038);
635            map.put("text", "<emo038>");
636            mEmoList.add(map);
637            map = new HashMap<String, Object>();
638            map.put("img", R.drawable.emo039);
639            map.put("text", "<emo039>");
640            mEmoList.add(map);
641            map = new HashMap<String, Object>();
642            map.put("img", R.drawable.emo040);
643            map.put("text", "<emo040>");
644            mEmoList.add(map);
645            map = new HashMap<String, Object>();
646            map.put("img", R.drawable.emo041);
647            map.put("text", "<emo041>");
648            mEmoList.add(map);
649            map = new HashMap<String, Object>();
650            map.put("img", R.drawable.emo042);
651            map.put("text", "<emo042>");
652            mEmoList.add(map);
653            map = new HashMap<String, Object>();
654            map.put("img", R.drawable.emo043);
655            map.put("text", "<emo043>");
656            mEmoList.add(map);
657            map = new HashMap<String, Object>();
658            map.put("img", R.drawable.emo044);
659            map.put("text", "<emo044>");
660            mEmoList.add(map);
661            map = new HashMap<String, Object>();
662            map.put("img", R.drawable.emo045);
663            map.put("text", "<emo045>");
664            mEmoList.add(map);
665            map = new HashMap<String, Object>();
666            map.put("img", R.drawable.emo046);
667            map.put("text", "<emo046>");
668            mEmoList.add(map);
669            map = new HashMap<String, Object>();
670            map.put("img", R.drawable.emo047);
671            map.put("text", "<emo047>");
672            mEmoList.add(map);
673            map = new HashMap<String, Object>();
674            map.put("img", R.drawable.emo048);
675            map.put("text", "<emo048>");
676            mEmoList.add(map);
677            map = new HashMap<String, Object>();
678            map.put("img", R.drawable.emo049);
679            map.put("text", "<emo049>");
680            mEmoList.add(map);
681            map = new HashMap<String, Object>();
682            map.put("img", R.drawable.emo050);
683            map.put("text", "<emo050>");
684            mEmoList.add(map);
685            map = new HashMap<String, Object>();
686            map.put("img", R.drawable.emo051);
687            map.put("text", "<emo051>");
688            mEmoList.add(map);
689            map = new HashMap<String, Object>();
690            map.put("img", R.drawable.emo052);
691            map.put("text", "<emo052>");
692            mEmoList.add(map);
693            map = new HashMap<String, Object>();
694            map.put("img", R.drawable.emo053);
695            map.put("text", "<emo053>");
696            mEmoList.add(map);
697            map = new HashMap<String, Object>();
698            map.put("img", R.drawable.emo054);
699            map.put("text", "<emo054>");
700            mEmoList.add(map);
701            map = new HashMap<String, Object>();
702            map.put("img", R.drawable.emo055);
703            map.put("text", "<emo055>");
704            mEmoList.add(map);
705            map = new HashMap<String, Object>();
706            map.put("img", R.drawable.emo056);
707            map.put("text", "<emo056>");
708            mEmoList.add(map);
709            map = new HashMap<String, Object>();
710            map.put("img", R.drawable.emo057);
711            map.put("text", "<emo057>");
712            mEmoList.add(map);
713            map = new HashMap<String, Object>();
714            map.put("img", R.drawable.emo058);
715            map.put("text", "<emo058>");
716            mEmoList.add(map);
717            map = new HashMap<String, Object>();
718            map.put("img", R.drawable.emo059);
719            map.put("text", "<emo059>");
720            mEmoList.add(map);
721            map = new HashMap<String, Object>();
722            map.put("img", R.drawable.emo060);
723            map.put("text", "<emo060>");
724            mEmoList.add(map);
725            
726            /**
727             * 上述添加表情效率高，但是代码太冗余，下面的方式代码简单，但是效率较低
728             */
729            /*
730            HashMap<String, Integer> map;
731            for(int i = 0; i < 100; i++){
732                map = new HashMap<String, Integer>();
733                Field field=R.drawable.class.getDeclaredField("image"+i);  
734                int resourceId=Integer.parseInt(field.get(null).toString());
735                map.put("img", resourceId);
736                mEmoList.add(map);
737            }
738            */
739         return new SimpleAdapter(this, mEmoList, R.layout.grid_view_item, 
740                     new String[]{"img"}, new int[]{R.id.imageView});
741     }
742     
743     
744     long waitTime = 2000;
745     long touchTime = 0;
746     @Override
747     public boolean onKeyDown(int keyCode, KeyEvent event) {
748         if(event.getAction() == KeyEvent.ACTION_DOWN && KeyEvent.KEYCODE_BACK == keyCode) {
749             long currentTime = System.currentTimeMillis();
750             if((currentTime-touchTime)>=waitTime) {
751                 Toast.makeText(this, "再按一次退出", Toast.LENGTH_SHORT).show();
752                 touchTime = currentTime;
753             }else {
754                 finish();
755             }
756             return true;
757         }
758         return super.onKeyDown(keyCode, event);
759     }
760     
761 }

View Code

TaskService.java:

  1 package cn.com.farsgiht.bluetoothdemo.task;
  2 
  3 import java.io.BufferedInputStream;
  4 import java.io.BufferedOutputStream;
  5 import java.io.IOException;
  6 import java.io.InputStream;
  7 import java.io.OutputStream;
  8 import java.io.UnsupportedEncodingException;
  9 import java.util.ArrayList;
 10 import java.util.Calendar;
 11 import java.util.HashMap;
 12 import java.util.UUID;
 13 import android.app.Service;
 14 import android.bluetooth.BluetoothAdapter;
 15 import android.bluetooth.BluetoothDevice;
 16 import android.bluetooth.BluetoothServerSocket;
 17 import android.bluetooth.BluetoothSocket;
 18 import android.content.ContentValues;
 19 import android.content.Context;
 20 import android.content.Intent;
 21 import android.database.sqlite.SQLiteDatabase;
 22 import android.os.Bundle;
 23 import android.os.Handler;
 24 import android.os.IBinder;
 25 import android.util.Log;
 26 import android.widget.ArrayAdapter;
 27 import android.widget.Toast;
 28 import cn.com.farsgiht.bluetoothdemo.ChatActivity;
 29 import cn.com.farsgiht.bluetoothdemo.UI.ChatListViewAdapter;
 30 import cn.com.farsgiht.bluetoothdemo.protocol.DataProtocol;
 31 import cn.com.farsgiht.bluetoothdemo.protocol.Message;
 32 import cn.com.farsgiht.bluetoothdemo.sound.SoundEffect;
 33 
 34 /**
 35  * 任务处理服务
 36  * @author Administrator
 37  */
 38 public class TaskService extends Service {
 39     public static final int BT_STAT_WAIT = 0;
 40     public static final int BT_STAT_CONN = 1;
 41     public static final int BT_STAT_ONLINE = 2;
 42     public static final int BT_STAT_UNKNOWN = 3;
 43     
 44  
 45     public static final String DEVICE_NAME = "device_name";
 46     
 47     private final String TAG = "TaskService";
 48     private TaskThread mThread;
 49 
 50     private BluetoothAdapter mBluetoothAdapter;
 51     
 52     private AcceptThread mAcceptThread;
 53     private ConnectThread mConnectThread;
 54     private ConnectedThread mCommThread;
 55     
 56     private boolean isServerMode = true;
 57 
 58     private static Handler mActivityHandler;
 59 
 60     // 任务队列
 61     private static ArrayList<Task> mTaskList = new ArrayList<Task>();
 62 
 63     private Handler mServiceHandler = new Handler() {
 64         @Override
 65         public void handleMessage(android.os.Message msg) {        
 66             switch (msg.what) {
 67             case Task.TASK_GET_REMOTE_STATE:
 68                 android.os.Message activityMsg = mActivityHandler.obtainMessage();
 69                 activityMsg.what = msg.what;
 70                 if (mAcceptThread != null && mAcceptThread.isAlive()) {
 71                     activityMsg.obj = "等待连接...";
 72                     activityMsg.arg1 = BT_STAT_WAIT;
 73                 } else if (mCommThread != null && mCommThread.isAlive()) {
 74                     activityMsg.obj = mCommThread.getRemoteName() + "[在线]";
 75                     activityMsg.arg1 = BT_STAT_ONLINE;
 76                 } else if (mConnectThread != null && mConnectThread.isAlive()) {
 77                     SoundEffect.getInstance(TaskService.this).play(3);
 78                     activityMsg.obj = "正在连接："
 79                             + mConnectThread.getDevice().getName();
 80                     activityMsg.arg1 = BT_STAT_CONN;
 81                 } else {
 82                     activityMsg.obj = "未知状态";
 83                     activityMsg.arg1 = BT_STAT_UNKNOWN;
 84                     SoundEffect.getInstance(TaskService.this).play(2);
 85                     // 重新等待连接
 86                     mAcceptThread = new AcceptThread();
 87                     mAcceptThread.start();
 88                     isServerMode = true;
 89                 }
 90 
 91                 mActivityHandler.sendMessage(activityMsg);
 92                 break;
 93             default:
 94                 break;
 95             }
 96             super.handleMessage(msg);
 97         }
 98     };
 99     
100     
101     
102     @Override
103     public void onCreate() {
104         super.onCreate();
105         mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
106         if (mBluetoothAdapter == null) {
107             Log.e(TAG, "Your device is not support Bluetooth!");
108             return;
109         }
110         mThread = new TaskThread();
111         mThread.start();
112     }
113 
114 
115     public static void start(Context c, Handler handler){
116         mActivityHandler = handler;
117         Intent intent = new Intent(c, TaskService.class);
118         c.startService(intent);
119     }
120     
121     public static void stop(Context c){
122         Intent intent = new Intent(c, TaskService.class);
123         c.stopService(intent);
124     }
125     
126 
127 
128     public static void newTask(Task target) {
129         synchronized (mTaskList) {
130             mTaskList.add(target);
131         }
132     }
133 
134     private class TaskThread extends Thread {
135         private boolean isRun = true;
136         private int mCount = 0;
137 
138         public void cancel() {
139             isRun = false;
140         }
141 
142         @Override
143         public void run() {
144             Task task;
145             while (isRun) {
146 
147                 // 有任务
148                 if (mTaskList.size() > 0) {
149                     synchronized (mTaskList) {
150                         // 获得任务
151                         task = mTaskList.get(0);
152                         doTask(task);
153                     }
154                 } else {
155                     try {
156                         Thread.sleep(200);
157                         mCount++;
158                     } catch (InterruptedException e) {
159                     }
160                     // 每过10秒钟进行一次状态检查
161                     if (mCount >= 50) {
162                         mCount = 0;
163                         // 检查远程设备状态
164                         android.os.Message handlerMsg = mServiceHandler
165                                 .obtainMessage();
166                         handlerMsg.what = Task.TASK_GET_REMOTE_STATE;
167                         mServiceHandler.sendMessage(handlerMsg);
168                     }
169                 }
170             }
171         }
172 
173     }
174 //对应三个线程，其中mCommThread是在mConnectThread的run()方法中new出来的
175     private void doTask(Task task) {
176         switch (task.getTaskID()) {
177         case Task.TASK_START_ACCEPT:
178             mAcceptThread = new AcceptThread();
179             mAcceptThread.start();
180             isServerMode = true;
181             break;
182         case Task.TASK_START_CONN_THREAD:
183             if (task.mParams == null || task.mParams.length == 0) {
184                 break;
185             }
186             BluetoothDevice remote = (BluetoothDevice) task.mParams[0];
187             mConnectThread = new ConnectThread(remote);
188             mConnectThread.start();
189             isServerMode = false;
190             break;
191         case Task.TASK_SEND_MSG:
192             boolean sucess = false;
193             if (mCommThread == null || !mCommThread.isAlive()
194                     || task.mParams == null || task.mParams.length == 0) {
195                 Log.e(TAG, "mCommThread or task.mParams null");
196             }else{
197                 byte[] msg = null;
198                 try {
199                     
200                     msg = DataProtocol.packMsg((String) task.mParams[0]);
201                     sucess = mCommThread.write(msg);
202      
203                 } catch (UnsupportedEncodingException e) {
204                     sucess = false;
205                 }
206             }
207             if (!sucess) {
208                 android.os.Message returnMsg = mActivityHandler.obtainMessage();
209                 returnMsg.what = Task.TASK_SEND_MSG_FAIL;
210                 returnMsg.obj = "消息发送失败";
211                 mActivityHandler.sendMessage(returnMsg);
212             }
213             break;
214         }
215 
216         // 移除任务
217         mTaskList.remove(task);//每次保证任务列表里面只有一个任务，task = mTaskList.get(0);
218     }
219 
220     @Override
221     public void onDestroy() {
222         super.onDestroy();
223         mThread.cancel();
224     }
225 
226     private final String UUID_STR = "00001101-0000-1000-8000-00805F9B34FB";
227 
228     /**
229      * 等待客户端连接线程
230      * 
231      * @author Administrator
232      */
233     private class AcceptThread extends Thread {
234         private final BluetoothServerSocket mmServerSocket;
235         private boolean isCancel = false;
236 
237         public AcceptThread() {
238             Log.d(TAG, "AcceptThread");
239             BluetoothServerSocket tmp = null;
240             try {
241                 tmp = mBluetoothAdapter.listenUsingRfcommWithServiceRecord(
242                         "MT_Chat_Room", UUID.fromString(UUID_STR));
243             } catch (IOException e) {
244             }
245             mmServerSocket = tmp;
246         }
247 
248         public void run() {
249             BluetoothSocket socket = null;
250             while (true) {
251                 try {
252                     // 阻塞等待
253                     socket = mmServerSocket.accept();
254                 } catch (IOException e) {
255                     if (!isCancel) {
256                         try {
257                             mmServerSocket.close();
258                         } catch (IOException e1) {
259                         }
260                         mAcceptThread = new AcceptThread();
261                         mAcceptThread.start();
262                         isServerMode = true;
263                     }
264                     break;
265                 }
266                 if (socket != null) {
267                     manageConnectedSocket(socket);
268                     try {
269                         mmServerSocket.close();
270                     } catch (IOException e) {
271                     }
272                     mAcceptThread = null;
273                     break;
274                 }
275             }
276         }
277 
278         public void cancel() {
279             try {
280                 Log.d(TAG, "AcceptThread canceled");
281                 isCancel = true;
282                 isServerMode = false;
283                 mmServerSocket.close();
284                 mAcceptThread = null;
285                 if (mCommThread != null && mCommThread.isAlive()) {
286                     mCommThread.cancel();
287                 }
288             } catch (IOException e) {
289             }
290         }
291     }
292 
293     /**
294      * 作为客户端连接指定的蓝牙设备线程
295      * 
296      * @author Administrator
297      */
298     private class ConnectThread extends Thread {
299         private final BluetoothSocket mmSocket;
300         private final BluetoothDevice mmDevice;
301 
302         public ConnectThread(BluetoothDevice device) {
303 
304             Log.d(TAG, "ConnectThread");
305 
306             if (mAcceptThread != null && mAcceptThread.isAlive()) {
307                 mAcceptThread.cancel();
308             }
309 
310             if (mCommThread != null && mCommThread.isAlive()) {
311                 mCommThread.cancel();
312             }
313 
314             // Use a temporary object that is later assigned to mmSocket,
315             // because mmSocket is final
316             BluetoothSocket tmp = null;
317             mmDevice = device;
318             try {
319                 tmp = device.createRfcommSocketToServiceRecord(UUID
320                         .fromString(UUID_STR));
321             } catch (IOException e) {
322                 Log.d(TAG, "createRfcommSocketToServiceRecord error!");
323             }
324 
325             mmSocket = tmp;
326         }
327 
328         public BluetoothDevice getDevice() {
329             return mmDevice;
330         }
331 
332         public void run() {
333             // Cancel discovery because it will slow down the connection
334             mBluetoothAdapter.cancelDiscovery();
335             try {
336                 // Connect the device through the socket. This will block
337                 // until it succeeds or throws an exception
338                 mmSocket.connect();
339             } catch (IOException connectException) {
340                 // Unable to connect; close the socket and get out
341                 Log.e(TAG, "Connect server failed");
342                 try {
343                     mmSocket.close();
344                 } catch (IOException closeException) {
345                 }
346                 mAcceptThread = new AcceptThread();
347                 mAcceptThread.start();
348                 isServerMode = true;
349                 return;
350             } // Do work to manage the connection (in a separate thread)
351             manageConnectedSocket(mmSocket);
352         }
353 
354         public void cancel() {
355             try {
356                 mmSocket.close();
357             } catch (IOException e) {
358             }
359             mConnectThread = null;
360         }
361     }
362 
363     private void manageConnectedSocket(BluetoothSocket socket) {
364         // 启动子线程来维持连接
365         mCommThread = new ConnectedThread(socket);
366         mCommThread.start();
367     }
368 
369     private class ConnectedThread extends Thread {
370         private final BluetoothSocket mmSocket;
371         private final InputStream mmInStream;
372         private final OutputStream mmOutStream;
373         private BufferedOutputStream mmBos;
374         private byte[] buffer;
375 
376         public ConnectedThread(BluetoothSocket socket) {
377             Log.d(TAG, "ConnectedThread");
378             mmSocket = socket;
379             InputStream tmpIn = null;
380             OutputStream tmpOut = null;
381             try {
382                 tmpIn = socket.getInputStream();
383                 tmpOut = socket.getOutputStream();
384             } catch (IOException e) {
385             }
386             mmInStream = tmpIn;
387             mmOutStream = tmpOut;
388             mmBos = new BufferedOutputStream(mmOutStream);
389         }
390 
391         public OutputStream getOutputStream() {
392             return mmOutStream;
393         }
394 
395         public boolean write(byte[] msg) {
396             if (msg == null)
397                 return false;
398             try {
399                 mmBos.write(msg);
400                 mmBos.flush();
401                 
402                 mActivityHandler.obtainMessage(Task.TASK_SEND_MSG, -1, -1, new String(msg)).sendToTarget();
403                 System.out.println("Write:" + msg);
404             } catch (IOException e) {
405                 return false;
406             }
407             return true;
408         }
409 
410         public String getRemoteName() {
411             return mmSocket.getRemoteDevice().getName();
412         }
413 
414         
415         
416         
417         public void cancel() {
418             try {
419                 mmSocket.close();
420             } catch (IOException e) {
421             }
422             mCommThread = null;
423         }
424 
425         public void run() {
426             try {
427                 write(DataProtocol.packMsg(mBluetoothAdapter.getName()
428                         + "已经上线
"));//获取本地蓝牙适配器的蓝牙名称，这一条消息默认发送出去啦，
429                                       //但消息记录里面不应该有这条消息，消息记录里面记录按过发送键的消息
430             } catch (UnsupportedEncodingException e2) {
431             }
432             int size;
433             Message msg;
434             android.os.Message handlerMsg;
435             buffer = new byte[1024];
436 
437             BufferedInputStream bis = new BufferedInputStream(mmInStream);
438             // BufferedReader br = new BufferedReader(new
439             // InputStreamReader(mmInStream));
440             HashMap<String, Object> data;
441             while (true) {
442                 try {
443                     size = bis.read(buffer);
444                     msg = DataProtocol.unpackData(buffer);
445                     if (msg == null)
446                         continue;
447 
448                     if (mActivityHandler == null) {
449                         return;
450                     }
451 
452                     msg.remoteDevName = mmSocket.getRemoteDevice().getName();//得到对方设备的名字
453                     if (msg.type == DataProtocol.TYPE_FILE) {
454                         // 文件接收处理忽略
455 
456                     } else if (msg.type == DataProtocol.TYPE_MSG) {
457                         data = new HashMap<String, Object>();
458                         System.out.println("Read data.");
459                         data.put(ChatListViewAdapter.KEY_ROLE,
460                                 ChatListViewAdapter.ROLE_TARGET);
461                         data.put(ChatListViewAdapter.KEY_NAME,
462                                 msg.remoteDevName);
463                         data.put(ChatListViewAdapter.KEY_TEXT, msg.msg);
464                         
465                         // 通过Activity更新到UI上
466                         handlerMsg = mActivityHandler.obtainMessage();
467                         handlerMsg.what = Task.TASK_RECV_MSG;
468                         handlerMsg.obj = data;
469                         mActivityHandler.sendMessage(handlerMsg);
470                     }
471                 } catch (IOException e) {
472                     try {
473                         mmSocket.close();
474                     } catch (IOException e1) {
475                     }
476                     mCommThread = null;
477                     if (isServerMode) {
478                         // 检查远程设备状态
479                         handlerMsg = mServiceHandler.obtainMessage();
480                         handlerMsg.what = Task.TASK_GET_REMOTE_STATE;
481                         mServiceHandler.sendMessage(handlerMsg);
482                         SoundEffect.getInstance(TaskService.this).play(2);
483                         mAcceptThread = new AcceptThread();
484                         mAcceptThread.start();
485                     }
486                     break;
487                 }
488             }
489         }
490     }
491 
492     // ================================================================
493 
494     @Override
495     public IBinder onBind(Intent intent) {
496         // TODO Auto-generated method stub
497         return null;
498     }
499 
500 }

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原文地址：https://www.cnblogs.com/hixin/p/4366481.html

《安卓网络编程》之第六篇 Android中的WIFI和蓝牙

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保存和恢复activity的状态数据