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POReconnecting to an Android Socket in order to wait for Server
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copied!<p>So I have TCP server in Windows that is programmed in C++ and a client in JAVA, Android 4.0.4. </p> <p>In Android, I connect like this:</p> <pre><code>public boolean sendConnectRequest() { while (isSocketConnected == false) { try { if(comSocket == null) comSocket = new Socket("192.168.0.1",1531); isSocketConnected = comSocket.isConnected(); if (isSocketConnected) { out = comSocket.getOutputStream(); in = comSocket.getInputStream(); } else comSocket.close(); } catch (IOException ex) { Log.e("TCP Error", ex.getLocalizedMessage()); } } return true; } </code></pre> <p>I typically have no problems with this code on the first connection to the server.</p> <p>When i disconnect from the server, I call this:</p> <pre><code>public void closeConnection() { if (comSocket != null) { try { comSocket.close(); isSocketConnected = false; if (out != null) out.close(); if (in != null) out.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre> <p>So here is the problem... I hit the home button on the smartphone, which places the program in pause. I start the program again and it calls the resume function in activity, which in turn starts the process toward reconnection. The connection is attempted and i get no errors. However, my Windows server records no connection. In Windows, I know that I am still blocked at:</p> <pre><code>SOCKET connectionSocket = accept(tcpNetworkData->socket, (struct sockaddr*)&from, &fromlen); </code></pre> <p>I believe this is normal. When I am in debug mode on the Android side, I notice that it returns immediately from the line: comSocket = new Socket("192.168.0.1",1531); This should indicate to me that a connection is made. </p> <p>If you follow me so far... I should also say that if I shut the server down, the client resets by closing the connection and opening a new one. This time the comSocket = new Socket("192.168.0.1",1531) does not block as it should and the execution keeps going. This is obviously wrong. I think it is a resource release problem but why? With Winsock you can solve this problem with this line of code:</p> <pre><code>int so_reuseaddr = TRUE; setsockopt(networkData->socket, SOL_SOCKET, SO_REUSEADDR, (const char*)&so_reuseaddr,sizeof(so_reuseaddr)); </code></pre> <p>Can you do something similar with Android or do you have to? Thank you for your help!</p>

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