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POAndroid socket run in gingerbread but not in jelly bean
 

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  1. POAndroid socket run in gingerbread but not in jelly bean
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    <p>From this code i can transfer files with my PC in android 2.3.3.(Dell Streak) but when I Run the same code in android 4.2 (Samsung GS 3 ) It does nothing. I think the problem is when the Socket is to initialize ? What I have to do this get working in 4.2?</p> <pre><code>package com.hrandika.synchronizer.serverClient; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.net.Socket; import android.os.AsyncTask; import android.util.Log; public class Client { File sendingFile; public Client(File sendingFile) { Log.d("Client", "Cleint : Constructed"); this.sendingFile = sendingFile; } public void send(String ip) { try { Log.d("Client", "Cleint stating ...."); Socket socket = new Socket(ip, 5555); Log.d("Client", "Cleint Socket Okay"); OutputStream outputStream = socket.getOutputStream(); OutputStreamWriter outputStreamWriter = new OutputStreamWriter( outputStream); Log.d("Client", "Cleint ready to sent"); outputStreamWriter.write(sendingFile.getName() + "\n"); outputStreamWriter.flush(); Log.d("Client", "Cleint Sent"); InputStream inputStream = socket.getInputStream(); InputStreamReader inputStreamReader = new InputStreamReader( inputStream); BufferedReader bufferedReader = new BufferedReader( inputStreamReader); String serverResponse = bufferedReader.readLine(); if (serverResponse.equals("READY")) { Log.d("Client", "Cleint : server ready"); byte[] buffer = new byte[(int) sendingFile.length()]; FileInputStream fileInputStream = new FileInputStream( sendingFile); BufferedInputStream bufferedInputStream = new BufferedInputStream( fileInputStream); bufferedInputStream.read(buffer, 0, buffer.length); outputStream.write(buffer, 0, buffer.length); outputStream.flush(); bufferedInputStream.close(); fileInputStream.close(); socket.close(); } } catch (Exception e) { } } public class Sender extends AsyncTask&lt;String, String, String&gt;{ @Override protected String doInBackground(String... params) { send("192.168.43.21"); return null; } } } // End class Client </code></pre>
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    1. COuse e.printStackTrace(); under the catch to see if this code giving any error?
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    2. COHow do you instantiate and start `Sender`? Blind guess: you call `doInBackground()` yourself (which is `AsyncTask` misuse) and thus cause `NetworkOnMainThreadException` ?
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      1. POAndroid socket run in gingerbread but not in jelly bean
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    3. COit shows this 11-28 17:17:52.890: W/System.err(20565): android.os.NetworkOnMainThreadException
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