I do not see how it can work - my thread is asynchronous task blocked on "receive" method The thread must initiate update of textview
i had a look at the AsyncTask but what parameters should be passed to it? Thanks again, -V On Oct 16, 5:03 pm, Kostya Vasilyev <kmans...@gmail.com> wrote: > Runnable is a Java interface that defines one method: "run". You can > think of it as a method packaged as an object. > > Define a class that implements Runnable, and pass it to m_view.update() > or runOnUIThread(). > > Once you've done that, the runnable object's run() method will be called > (asynchronously) on the UI thread. This method can then call methods in > m_view to display the message etc. > > You might also want to look at AsyncTask: > > http://developer.android.com/reference/android/os/AsyncTask.html > > >> > 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. > << > > -- Kostya > > 17.10.2010 0:12, chcat пишет: > > > > > Ok, that helps, but what is Runnable action and how is it related to > > thread? > > > On Oct 16, 3:00 pm, Kostya Vasilyev<kmans...@gmail.com> wrote: > >> You can only access UI objects from the main (UI) thread. > > >> There are several ways to "post" UI operations to the UI thread. > > >> This one is probably the easiest: Activity.runOnUIThread(Runnable action) > > >>http://developer.android.com/reference/android/app/Activity.html#runO...) > > >> -- Kostya > > >> 16.10.2010 20:58, chcat пишет: > > >>> I have an Activity with TextView that I am trying to update from > >>> different thread. To do that i pass TextView to the "updater" thread > >>> onCreate(..) > >>> .. > >>> txtStatus = (TextView)this.findViewById(R.id.status); > >>> // start udp server as separate thread and pass TextView to that > >>> thread to print text messages from udp socket > >>> new Thread(new TelemetryServer(txtStatus)).start(); > >>> //see thread code below > >>> As a result i have thread error, even though "updater" is > >>> synchronized: > >>> ERROR/UDP(282): android.view.ViewRoot$CalledFromWrongThreadException: > >>> Only the original thread that created a view hierarchy can touch its > >>> views. > >>> Any other ideas how to solve this problem? > >>> Tnank you, > >>> -V > >>> public class TelemetryServer implements Runnable { > >>> public static final String SERVERIP = "127.0.0.1"; // 'Within' the > >>> emulator! > >>> public static final int SERVERPORT = 2222; > >>> private TextView m_view; > >>> private DatagramSocket socket; > >>> private boolean loop; > >>> private synchronized void update( String msg) > >>> { > >>> m_view.append("\n"); > >>> m_view.append(msg); > >>> } > >>> public TelemetryServer(TextView _view) > >>> { > >>> m_view = _view; > >>> loop = true; > >>> } > >>> public void run() { > >>> try { > >>> InetAddress serverAddr = > >>> InetAddress.getByName(SERVERIP); > >>> Log.d("UDP", "S: Connecting..."); > >>> socket = new DatagramSocket(SERVERPORT, > >>> serverAddr); > >>> Log.i("TelemetryServer", "started"); > >>> while(loop) { > >>> byte[] buf = new byte[1024]; > >>> DatagramPacket packet = new > >>> DatagramPacket(buf, buf.length); > >>> socket.receive(packet); > >>> update(new String(packet.getData())); > >>> } > >>> } catch (Exception e) { > >>> Log.e("UDP", "S: Error", e); > >>> } // end of try > >>> Log.d("UDP", "S: Done."); > >>> socket.close(); > >>> } > >>> } > >> -- > >> Kostya Vasilyev -- WiFi Manager + pretty widget > >> --http://kmansoft.wordpress.com > > -- > Kostya Vasilyev -- WiFi Manager + pretty widget > --http://kmansoft.wordpress.com -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
