An alternate approach is to use the view object's post(Runnable r)
method. Note that Kostya's also requires a reference - but to the
Activity object.
myView.post(new Runnable() {...
On Oct 16, 12:00 pm, Kostya Vasilyev <[email protected]> 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)
[SChaser] This requires a reference to the activity, as it is not a
static method.
>
> http://developer.android.com/reference/android/app/Activity.html#runO...)
>
> 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
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