java - why am i getting an illegal argument exception from this code? -
this code written following tutorial: http://www.techsono.com/consult/update-android-gui-timer/
i don't understand why i'm getting illegal argument exception code when try , run on device. i'm not whats causing illegal argument exception either. code i'm running attempt make client connects server @ ip address (this ip address changed) in order receive information update android gui show said information. text views in starting layout whats being updated in gui if helps?
i apologize in advance if explanation of seems bit confusing, confusing me :3 think understand codes doing clarification on code , why isn't working , whats problem great.
heres code:
package com.example.clienttest; import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstreamreader; import java.net.socket; import java.util.timer; import java.util.timertask; import java.util.concurrent.timeunit; import android.app.activity; import android.os.bundle; import android.os.handler; import android.view.menu; import android.widget.textview; public class clienttestmain extends activity { final handler myhandler = new handler(); @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_client_test_main); timer mytimer = new timer(); mytimer.schedule(new timertask(){ @override public void run(){ updategui();}},0,0); } final runnable myrunnable = new runnable(){ @override public void run(){ textview header = (textview) findviewbyid(r.id.textview4); textview time = (textview) findviewbyid(r.id.textview4); textview trackid = (textview) findviewbyid(r.id.textview4); textview latitude = (textview) findviewbyid(r.id.textview4); textview longitude = (textview) findviewbyid(r.id.textview4); textview depth = (textview) findviewbyid(r.id.textview4); textview speed = (textview) findviewbyid(r.id.textview4); textview heading = (textview) findviewbyid(r.id.textview4); try{ while(true){ socket infosocket = new socket("128.23.1.0", 2000); inputstreamreader stream = new inputstreamreader(infosocket.getinputstream()); bufferedreader reader = new bufferedreader(stream); string message = reader.readline(); string[] op = message.split(","); header.settext(op[0]); time.settext(op[1]); trackid.settext(op[2]); latitude.settext(op[3]); longitude.settext(op[4]); depth.settext(op[5]); speed.settext(op[6]); heading.settext(op[7]); timeunit.seconds.sleep(1); } }catch(ioexception ex){ ex.printstacktrace(); }catch (interruptedexception e) { } }}; private void updategui(){ myhandler.post(myrunnable); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate menu; adds items action bar if present. getmenuinflater().inflate(r.menu.client_test_main, menu); return true; } } heres logcat:
09-04 12:04:23.453: d/androidruntime(18628): shutting down vm 09-04 12:04:23.453: w/dalvikvm(18628): threadid=1: thread exiting uncaught exception (group=0x40bea1f8) 09-04 12:04:23.453: e/androidruntime(18628): fatal exception: main 09-04 12:04:23.453: e/androidruntime(18628): java.lang.runtimeexception: unable start activity componentinfo{com.example.clienttest/com.example.clienttest.clienttestmain}: java.lang.illegalargumentexception 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread.performlaunchactivity(activitythread.java:1970) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread.handlelaunchactivity(activitythread.java:1995) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread.access$600(activitythread.java:128) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread$h.handlemessage(activitythread.java:1161) 09-04 12:04:23.453: e/androidruntime(18628): @ android.os.handler.dispatchmessage(handler.java:99) 09-04 12:04:23.453: e/androidruntime(18628): @ android.os.looper.loop(looper.java:137) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread.main(activitythread.java:4514) 09-04 12:04:23.453: e/androidruntime(18628): @ java.lang.reflect.method.invokenative(native method) 09-04 12:04:23.453: e/androidruntime(18628): @ java.lang.reflect.method.invoke(method.java:511) 09-04 12:04:23.453: e/androidruntime(18628): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:790) 09-04 12:04:23.453: e/androidruntime(18628): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:557) 09-04 12:04:23.453: e/androidruntime(18628): @ dalvik.system.nativestart.main(native method) 09-04 12:04:23.453: e/androidruntime(18628): caused by: java.lang.illegalargumentexception 09-04 12:04:23.453: e/androidruntime(18628): @ java.util.timer.schedule(timer.java:479) 09-04 12:04:23.453: e/androidruntime(18628): @ com.example.clienttest.clienttestmain.oncreate(clienttestmain.java:28) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activity.performcreate(activity.java:4465) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1053) 09-04 12:04:23.453: e/androidruntime(18628): @ android.app.activitythread.performlaunchactivity(activitythread.java:1934) 09-04 12:04:23.453: e/androidruntime(18628): ... 11 more 09-04 12:09:29.781: i/process(18628): sending signal. pid: 18628 sig: 9
you cannot pass period value = 0
throws
illegalargumentexception if delay < 0 or period <= 0.
illegalstateexception if timer has been canceled, or if task has been scheduled or canceled.
mytimer.schedule(new timertask(){ @override public void run(){ updategui();}},0,1000); //update here }
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