You can register a handler in your code and send message to update your UI
component in Handler. I used this way to solve a similar problem like urs
before. For exapmpel
if (socket.isConnected()) {
OutputStreamOut = new
ObjectOutputStream(socket.
getOutputStream());
InputStreamIn = new
ObjectInputStream(socket.getInputStream());
// everything worked fine until here
//instead of doing this, send msg to a customized
handler
//statusTxt.setText("App is now connected to:\n" +
IP + " : "
mHandler.sendEmptyMessage(UPDATE TEXT); //use
something like this
+ Port); // CRASHING !!!!
connectBt.setText("Disconnect");
connected = true;
continueBt.setVisibility(0);
} else {
On Wed, Jul 21, 2010 at 12:25 AM, stephan <[email protected]> wrote:
> Yep. It seams quite obvious. Thoug we do not know what happens in
> "statusTxt.setText("")" you are probably calling any UI object
> (changing a Dialog message or what so ever). That's not nice. *grin*
>
> maybe you should use
>
> runOnUiThread(new Runnable() {
> @Override
> public void run() {
> statusTxt.setText("App
> is now connected to:\n" + IP + " : "+ Port);
> }
> });
>
>
> Stephan
>
> On 19 Jul., 20:16, Brion Emde <[email protected]> wrote:
> > It looks to me that you are trying to do stuff in the UI Thread while
> > in the doInBackground() function.
> >
> > You are supposed to do UI related stuff in the onPostExecute(),
> > onPreExecute() and onProgressUpdate(), not in doInBackground.
> >
> > This is what I'm talking about:
> >
> > if (socket.isConnected()) {
> > OutputStreamOut = new
> > ObjectOutputStream(socket.getOutputStream());
> > InputStreamIn = new
> > ObjectInputStream(socket.getInputStream());
> > // everything worked fine until here
> >
> > !!!! This is talking to the UI Thread -> not allowed!!!
> >
> > statusTxt.setText("App is now
> > connected to:\n" + IP + " : "
> > + Port); // CRASHING !!!!
> > connectBt.setText("Disconnect");
> > connected = true;
> > continueBt.setVisibility(0);
> > } else {
> > throw new UnknownHostException();
> > }
> >
> > On Jul 19, 11:47 am, Francesco <[email protected]> wrote:
> >
> > > Hi, when trying to start a socket connection in an AsyncTask, my
> > > application crashes for no reason (debugger says
> > > "android.view.ViewRoot$CalledFromWrongThreadException: Only the
> > > original thread that created a view hierarchy can touch its views.").
> >
> > > If I remove the Async and use the same code, my application works (of
> > > course, if I make the socket connect to a not valid IP or port, the
> > > application freezes for 5 seconds, because that's the socket's
> > > timeout).
> > > As I'd like to avoid that 5 seconds freeze with wrong configurations,
> > > I have to implement the AsyncTask.
> >
> > > The application works just fine opening the socket and everything
> > > related, but as I try and make it change some TextViews, it gives this
> > > error. The AsyncTask doc says:
> >
> > > "AsyncTask enables proper and easy use of the UI thread. This class
> > > allows to perform background operations and publish results on the UI
> > > thread without having to manipulate threads and/or handlers."
> >
> > > So I'm doing something legit.
> >
> > > This is the code, it's quite simple:
> >
> > > private class ConnectTask extends AsyncTask<Void, Void, Void> {
> > > protected Void doInBackground(Void... params) {
> > > try {
> > > InetAddress inetAddr =
> InetAddress.getByName(IP);
> > > int PORT = Integer.parseInt(Port);
> >
> > > if (PORT < 0)
> > > throw (new
> NumberFormatException());
> > > if (IP.equals(""))
> > > throw (new
> UnknownHostException());
> >
> > > SocketAddress sockaddr = new
> InetSocketAddress(inetAddr,
> > > PORT);
> > > socket = new Socket();
> > > socket.connect(sockaddr, 5000);
> >
> > > if (socket.isConnected()) {
> > > OutputStreamOut = new
> > > ObjectOutputStream(socket.getOutputStream());
> > > InputStreamIn = new
> ObjectInputStream(socket.getInputStream());
> > > // everything worked fine until here
> > > statusTxt.setText("App is now connected
> to:\n" + IP + " : "
> > > + Port); // CRASHING !!!!
> > > connectBt.setText("Disconnect");
> > > connected = true;
> > > continueBt.setVisibility(0);
> > > } else {
> > > throw new UnknownHostException();
> > > }
> > > } catch (SocketTimeoutException sockExc) {
> > > statusTxt.setText("Connection timeout:\nplease,
> review your IP/
> > > Port settings.");
> > > } catch (NumberFormatException numExc) {
> > > statusTxt.setText("Number Format
> Error:\nplease, review your
> > > Port settings.");
> > > } catch (UnknownHostException e1) {
> > > statusTxt.setText("Unknown Host
> Error:\nplease, review your IP/
> > > Port settings.");
> > > } catch (IOException e2) {
> > > statusTxt.setText("Input/Output
> Error:\nplease, review your
> > > connection settings.");
> > > } finally {
> > > //dialog.dismiss();
> > > }
> > > return null;
> > > }
> >
> > > protected void onProgressUpdate(Void... progress) {}
> >
> > > protected void onPostExecute(Void result) {}
> > > }
>
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