Hi!
I'm having weird problems with a socket connection in an AsyncTask:
public class diagnosis extends Activity {
TextView tv;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.diagnosis_test_gui);
//textview erzeugen
tv = (TextView) findViewById(R.id.dtg_tv);
tv.setMovementMethod(ScrollingMovementMethod.getInstance());
}
private class conmng extends AsyncTask<String, Void, Integer> {
PrintWriter pw;
OutputStream os;
BufferedReader br;
@Override
protected Integer doInBackground(String... params) {
Socket cs = null;
try {
cs.setSoTimeout(500);
} catch (SocketException e) {
tv.append("Socket Timeout");
e.printStackTrace();
}
tv.append("trying to open socket\n");
try {
tv.append("before socket\n");
cs = new Socket("10.0.0.4", 23);
tv.append("after socket");
os = cs.getOutputStream();
pw = new PrintWriter(os, false);
br = new BufferedReader(new
InputStreamReader(cs.getInputStream()));
} catch (UnknownHostException uh) {
uh.printStackTrace();
tv.append("unknown host");
} catch (IOException io) {
tv.append("IO Exception");
io.printStackTrace();
} catch (SecurityException se) {
tv.append("Security Exception");
}
//do something....
return 1;
}
@Override
protected void onPostExecute(Integer result) {
// TODO Auto-generated method stub
tv.append("im Post Execute");
super.onPostExecute(result);
}
}
->If I try to set the timeout of the Socket -> null Pointer Exception
->If I try to connect to an existing address, I get the message
"tv.append("after socket");" but just a second after that I get "08-13
20:44:05.657: ERROR/AndroidRuntime(304): Caused by:
android.view.ViewRoot$CalledFromWrongThreadException: Only the original
thread that created a view hierarchy can touch its views."
->If I try to connect to an address that is not existing(which is exactly
the situation I want to simulate) I wont get any exception like "unknown
host" or anything it just hangs and hangs and hangs withour any error or
something till it kills my router with its trying(DDos anyone?) :D
The whole thing worked just fine in native java and I would greatly
appreciate any help!!!!!
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