第81-86行，整个方法的主体就是创建一个”Device List Monitor”的线程。线程运行方法run直接调用DeviceMonitor的deviceMonitorLoop方法来进行无限循环监控设备状态了。

155   private void deviceMonitorLoop()

156   {

157     do

158     {

159       try

160       {

161         if (this.mMainAdbConnection == null) {

162           Log.d("DeviceMonitor", "Opening adb connection");

163           this.mMainAdbConnection =

openAdbConnection();

164           if (this.mMainAdbConnection == null) {

165             this.mConnectionAttempt += 1;

166             Log.e("DeviceMonitor", "Connection attempts: " + this.mConnectionAttempt);

167             if (this.mConnectionAttempt > 10) {

168               if (!this.mServer.startAdb()) {

169                 this.mRestartAttemptCount += 1;

170                 Log.e("DeviceMonitor", "adb restart attempts: " + this.mRestartAttemptCount);

171               }

172               else {

173                 this.mRestartAttemptCount = 0;

174               }

175             }

176             waitABit();

177           } else {

178             Log.d("DeviceMonitor", "Connected to adb for device monitoring");

179             this.mConnectionAttempt = 0;

180           }

181         }

182

183         if ((this.mMainAdbConnection != null) &&

(!this.mMonitoring)) {

184           this.mMonitoring = sendDeviceListMonitoringRequest();

185         }

186

187         if (this.mMonitoring)

188         {

189           int length = readLength(this.mMainAdbConnection, this.mLengthBuffer);

190

191           if (length >= 0)

192           {

193             processIncomingDeviceData(length);

194

195

196             this.mInitialDeviceListDone = true;

197           }

198         }

199       }

200       catch (AsynchronousCloseException ace) {}catch (TimeoutException ioe)

201       {

202         handleExpectionInMonitorLoop(ioe);

203       } catch (IOException ioe) {

204         handleExpectionInMonitorLoop(ioe);

205       }

206     } while (!this.mQuit);

207   }

代码8-4-3 DeviceMonitor - deviceMonitorLoop

• 第一步:163行,如果还没有连接上的ADB服务器的话就先连接上
• 第二步: 168行，确保ADB服务器已经启动
• 第三步: 183-185行，往ADB服务器发送监控命令，监控所有连接上来的移除的设备
• 第四步: 处理所获得的监控设备列表

我们先看第一步，在上一节中我们已经看到ADB服务器的启动过程了，但是我们还没有看到ADB客户端是怎么连接上服务器的,一下的代码就是一个实例:

255   private SocketChannel openAdbConnection()

256   {

257     Log.d("DeviceMonitor", "Connecting to adb for Device List Monitoring...");

258

259     SocketChannel adbChannel = null;

260     try {

261       adbChannel =

SocketChannel.open(

AndroidDebugBridge.getSocketAddress());

262       adbChannel.socket().setTcpNoDelay(true);

263     }

264     catch (IOException e) {}

265

266     return adbChannel;

267   }

代码8-4-4 DeviceMonitor - openAdbConnection