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POerror: Only the original thread that created a view hierarchy can touch its views
 

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  1. POerror: Only the original thread that created a view hierarchy can touch its views
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    <p>Hi and thank you for looking at my question. I am an intermediate programmer in C but an Android newbie. I have been trying to get a chat programming working. Assuming everything else in the code below works perfectly. The one question I like to ask is when I try to <strong>setText()</strong> from a thread running, I get an exception above. I looked at many many websites and here too. Found many things, but I really do not understand. Please explain to me in the most simple way or offer me some simple fix if possible. </p> <p>Thank you very much!!</p> <pre><code>public class chatter extends Activity { private String name = "Unknown User"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final EditText msgToServer = (EditText) findViewById(R.id.msgBox); final EditText chatFromServer = (EditText) findViewById(R.id.chatBox); final Button MsgToServer = (Button) findViewById(R.id.sendButton); Socket socket = null; String ipAddress = "192.168.1.103"; try { InetAddress serverAddr = InetAddress.getByName(ipAddress); Socket socketMain = new Socket(serverAddr, 4444); socket = socketMain; } catch (IOException e) { // TODO Auto-generated catch block Log.e("TCP", "error", e); } final OutMsg outMsg = new OutMsg(socket); Thread msgSenderThread = new Thread(outMsg); msgSenderThread.start(); //chatFromServer.post(new InMsg(socket, chatFromServer)); Thread msgReceiverThread = new Thread(new InMsg(socket, chatFromServer)); msgReceiverThread.start(); MsgToServer.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String msgToServerString; msgToServerString = msgToServer.getText().toString(); outMsg.message = name + ": " + msgToServerString; outMsg.readyToSend = true; msgToServer.setText(""); } }); } public void updateResultsInUi (String msg) { final EditText chatFromServer = (EditText) findViewById(R.id.chatBox); chatFromServer.setText(msg); } public class InMsg implements Runnable { Socket socket; EditText chatFromServer; public InMsg(Socket socket, EditText chatFromServer) { this.socket = socket; this.chatFromServer = chatFromServer; } public void run(){ try { BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); String str = "FIRSTMESSAGEFROMSERVER"; while (true) { if (str.equals("FIRSTMESSAGEFROMSERVER")) str = in.readLine(); else str = str + "\n" + in.readLine(); Log.e("TCP", "got the message: " + str); //Here is where went wrong****************** chatFromServer.setText(str); //****************************************** } } catch (IOException e) { // TODO Auto-generated catch block Log.e("TCP", "error in receiving", e); } } } @Override public boolean onCreateOptionsMenu(Menu menu) { MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.menu, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle item selection switch (item.getItemId()) { case R.id.setNameMenu: setname(); return true; default: return super.onOptionsItemSelected(item); } } public void populateChatBox (String msgFromS) { Log.e("TCP", "going in to popC"); final EditText textNameInput = (EditText) findViewById(R.id.nameBox); Log.e("TCP", " popC"); textNameInput.setText(msgFromS); Log.e("TCP", "going out from popC"); } public void setname() { setContentView(R.layout.custom_dialog); final EditText textNameInput = (EditText) findViewById(R.id.nameBox); Button submitNameButton = (Button) findViewById(R.id.submitNameButton); submitNameButton.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { String nameinput = textNameInput.getText().toString(); if (!name.equals("")) name = nameinput; setContentView(R.layout.main); } }); } } </code></pre>
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