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POreadUTF() causing Android app to hang
 

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    <p>I'm trying to compile the code at <a href="http://android-er.blogspot.com/2011/01/simple-communication-using.html" rel="nofollow">this</a> link.</p> <p>The code isn't working because it is getting hung up on this line:</p> <pre><code>textIn.setText(dataInputStream.readUTF()); </code></pre> <p>For some reason it doesn't get hung up on <code>writeUTF()</code> but it gets hung up on <code>readUTF()</code>. </p> <p>Can anyone point me in the right direction here? </p> <p>Here is my code:</p> <pre><code>public Socket socket = null; public DataOutputStream dataOutputStream = null; public DataInputStream dataInputStream = null; public Thread readjsonthrd = new Thread(new ReadJSONThread()); private final static String LOG_TAG = AndroidClient.class.getSimpleName(); private final Handler handler = new Handler(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Log.e(LOG_TAG, "Before OnCreate() Try"); try { Log.e(LOG_TAG, "In OnCreate() Try"); socket = new Socket("23.23.175.213", 9000); Log.e(LOG_TAG, "Created Socket"); dataOutputStream = new DataOutputStream(socket.getOutputStream()); Log.e(LOG_TAG, "Created DataOutputStream"); dataInputStream = new DataInputStream(socket.getInputStream()); Log.e(LOG_TAG, "Created DataInputStream"); Profile p = new Profile(); Log.e(LOG_TAG, "Created Profile Instance"); //Gets the local profile via JSON and converts into Profile type Gson gson = new Gson(); Log.e(LOG_TAG, "Created Gson Instance"); p = gson.fromJson(p.getProfileJSONStr(), Profile.class); Log.e(LOG_TAG, "Converted Profile to JSON"); //Gson gson = new Gson(); Log.e(LOG_TAG, "Before: outputJSON = gson.toJson(p);"); outputJSON = gson.toJson(p); Log.e(LOG_TAG, "Created outputJSON"); dataOutputStream.writeUTF(outputJSON); //OUTPUT OF JSON FROM LOCAL PROFILE BEING SENT TO THE SERVER dataOutputStream.flush(); Log.e(LOG_TAG, "Created dataOutputStream"); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.e(LOG_TAG, "Before initEventHandlers"); initEventHandlers(); Log.e(LOG_TAG, "Create Thread"); Thread serverthrd = new Thread(new ServerThread()); Log.e(LOG_TAG, "Start Thread"); serverthrd.start(); Log.e(LOG_TAG, "Started Thread"); } public class ServerThread implements Runnable { @Override public void run() { // TODO Auto-generated method stub //Socket socket = null; //DataOutputStream dataOutputStream = null; //DataInputStream dataInputStream = null; Log.e(LOG_TAG, "Before Server Try Statement"); try { Log.e(LOG_TAG, "In Server Try Statement"); //socket = new Socket("23.23.175.213", 1337); //dataOutputStream = new DataOutputStream(socket.getOutputStream()); //dataInputStream = new DataInputStream(socket.getInputStream()); /*Profile p = null; //Gets the local profile via JSON and converts into Profile type Gson gson = new Gson(); p = gson.fromJson(p.getProfileJSONStr(), Profile.class); //Gson gson = new Gson(); outputJSON = gson.toJson(p); dataOutputStream.writeUTF(outputJSON); //OUTPUT OF JSON FROM LOCAL PROFILE BEING SENT TO THE SERVER */ //dataOutputStream.writeUTF(textOut.getText().toString()); //OUTPUT JSON GOES HERE //textIn.setText(dataInputStream.readUTF()); Log.e(LOG_TAG, "Start Thread"); readjsonthrd.start(); Log.e(LOG_TAG, "Started Thread"); /*Log.e(LOG_TAG, "Before inputJSON String"); inputJSON = dataInputStream.readUTF(); //Convert Log.e(LOG_TAG, "After inputJSON String"); Log.e(LOG_TAG, "InputJSON:" + inputJSON);*/ //textIn.setText(dataInputStream.readUTF()); //GET JSON COMING FROM SERVER HERE refreshViewModels(); } /*catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }*/ finally{ if (socket != null){ try { socket.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (dataOutputStream != null){ try { dataOutputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } if (dataInputStream != null){ try { dataInputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } } public class ReadJSONThread implements Runnable { @Override public void run() { // TODO Auto-generated method stub //Socket socket = null; //DataOutputStream dataOutputStream = null; //DataInputStream dataInputStream = null; Log.e(LOG_TAG, "Before Read JSON Try Statement"); try { Log.e(LOG_TAG, "Before inputJSON String"); inputJSON = dataInputStream.readUTF(); //Convert Log.e(LOG_TAG, "After inputJSON String"); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre>
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    1. COAre you *sending* the data with `writeUTF()`? That's the only API that can produce something that `readUTF()` can understand.
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