當Android通過WiFly與Arduino通信時，HTTP失敗

Question

我想通過HTTP將命令傳遞給我的Arduino設備。設備接收到該命令，並按預期執行。但是我在下面提到的HttpClient.execute()中遇到錯誤。如何更正代碼？

protected String doInBackground(Void... params) { 
    try { 
     Log.i("CallArduino ","In doInBackground"); 
     final int TIMEOUT_MILLISEC = 1000; 
     HttpParams httpParams = new BasicHttpParams(); 
     HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC); 
     HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT_MILLISEC); 
     HttpClient client = new DefaultHttpClient(httpParams); 
     // URL="http://www.google.co.in"; 
     HttpGet get = new HttpGet(URL); 

     Log.i("CallArduino ","before get"); 
         responseGet = client.execute(get); 
     Log.i("CallArduino ","after get"); 
     resEntityGet = responseGet.getEntity(); 

     Log.i("CallArduino ","in PostExecute"); 
     if (resEntityGet != null) { 
      InputStream is = resEntityGet.getContent(); 
      BufferedReader reader = new BufferedReader(new InputStreamReader(is,"iso-8859-1"),8); 

      StringBuilder sb = new StringBuilder(); 
      sb.append(reader.readLine() + "\n"); 
      String line="0"; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      result=sb.toString(); 
     } 
    } 
    catch (ClientProtocolException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 
    finally{ 

    } 

輸出：

12-08 12:58:10.419: I/CallArduino(5652): before get 
12-08 12:58:11.589: W/System.err(5652): java.net.SocketTimeoutException 
12-08 12:58:11.589: W/System.err(5652): at java.net.PlainSocketImpl.read(PlainSocketImpl.java:491) 
12-08 12:58:11.589: W/System.err(5652): at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46) 
12-08 12:58:11.589: W/System.err(5652): at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.io.AbstractSessionInputBuffer.readLine(AbstractSessionInputBuffer.java:191) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.io.AbstractMessageParser.parseHeaders(AbstractMessageParser.java:122) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.io.AbstractMessageParser.parse(AbstractMessageParser.java:178) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.AbstractHttpClientConnection.receiveResponseHeader(AbstractHttpClientConnection.java:180) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.conn.DefaultClientConnection.receiveResponseHeader(DefaultClientConnection.java:235) 
12-08 12:58:11.599: W/System.err(5652): at org.apache.http.impl.conn.AbstractClientConnAdapter.receiveResponseHeader(AbstractClientConnAdapter.java:259) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.protocol.HttpRequestExecutor.doReceiveResponse(HttpRequestExecutor.java:279) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.protocol.HttpRequestExecutor.execute(HttpRequestExecutor.java:121) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:428) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:580) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:512) 
12-08 12:58:11.609: W/System.err(5652): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:490) 
12-08 12:58:11.609: W/System.err(5652): at com.example.homeautomation.CallArduino$httpTask.doInBackground(CallArduino.java:87) 
12-08 12:58:11.609: W/System.err(5652): at com.example.homeautomation.CallArduino$httpTask.doInBackground(CallArduino.java:1) 
12-08 12:58:11.609: W/System.err(5652): at android.os.AsyncTask$2.call(AsyncTask.java:264) 
12-08 12:58:11.609: W/System.err(5652): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) 
12-08 12:58:11.609: W/System.err(5652): at java.util.concurrent.FutureTask.run(FutureTask.java:137) 
12-08 12:58:11.609: W/System.err(5652): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208) 
12-08 12:58:11.609: W/System.err(5652): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) 
12-08 12:58:11.609: W/System.err(5652): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) 
12-08 12:58:11.619: W/System.err(5652): at java.lang.Thread.run(Thread.java:856) 
12-08 12:58:11.619: I/CallArduino(5652): result :null 

Answer 1

它可能是你的互聯網連接速度較弱。您可以使用以下方法增加您的超時間隔。

HttpConnectionParams.setSoTimeout(params, 1000);