java - trying to find when CH34xAndroidDriver.isConnected() is becomes true -

i trying find when , ch34xandroiddriver.isconnected() value becomes true. have tried find out , display value in toast. can explain clearly.

public class uartloopbackactivity extends activity { public static final string tag = "com.wch.wchusbdriver"; private static final string action_usb_permission = "com.wch.wchusbdriver.usb_permission"; /* thread read data */ public readthread handlerthread; protected final object threadlock = new object(); /* declare uart interface variable */ public ch34xandroiddriver uartinterface;  // byte timeout; // time out public context global_context; public boolean isconfiged = false; public boolean read_enable = false; public sharedpreferences shareprefsettings; drawable originaldrawable; public string act_string;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.main);      /* create editable text objects */     readtext = (edittext) findviewbyid(r.id.readvalues);     // writetext = (edittext) findviewbyid(r.id.writevalues);      global_context = this;      configbutton = (button) findviewbyid(r.id.configbutton);     originaldrawable = configbutton.getbackground();     readbuffer = new char[512];     baudrate = 9600;     stopbit = 1;     databit = 8;     parity = 0;     flowcontrol = 0;     configbutton.setonclicklistener(new opendevicelistener());     // writebutton.setonclicklistener(new onclickedwritebutton());      // writebutton.setenabled(false);     //      uartinterface = new ch34xandroiddriver(             (usbmanager) getsystemservice(context.usb_service), this,             action_usb_permission);     act_string = getintent().getaction();     if (-1 != act_string.indexof("android.intent.action.main")) {          log.d(tag, "android.intent.action.main");     } else if (-1 != act_string             .indexof("android.hardware.usb.action.usb_device_attached")) {         log.d(tag, "android.hardware.usb.action.usb_device_attached");     }      if (!uartinterface.usbfeaturesupported()) {         toast.maketext(this, "no support usb host api", toast.length_short)                 .show();         readtext.settext("no support usb host api");         uartinterface = null;         toast.maketext(global_context,                 "148k" + ((boolean) uartinterface.isconnected()),                 toast.length_short).show();     }      getwindow().setsoftinputmode(             windowmanager.layoutparams.soft_input_state_always_hidden);      if (read_enable == false) {         read_enable = true;          handlerthread = new readthread(handler);         handlerthread.start();         toast.maketext(global_context,"155k" + ((boolean) uartinterface.isconnected()),toast.length_short).show();     }  }  public class opendevicelistener implements view.onclicklistener {      @override     public void onclick(view v) {         // todo auto-generated method stub         boolean flags;         toast.maketext(global_context,"170" + ((boolean) uartinterface.isconnected()),toast.length_short).show();         log.d("onclick", "12");         if (false == isconfiged) {             log.d("onclick", "58");             isconfiged = true;             log.d("onclick", "98");             // writebutton.setenabled(true);             if (uartinterface.isconnected()) {                 log.d("onclick", "100");                 flags = uartinterface.uartinit();                 if (!flags) {                     log.d(tag, "init uart error");                     toast.maketext(global_context, "init uart error",                             toast.length_short).show();                 } else {                     if (uartinterface.setconfig(baudrate, databit, stopbit,                             parity, flowcontrol)) {                         log.d(tag, "configed");                     }                 }             }              if (isconfiged == true) {                 toast.maketext(global_context,"193" + ((boolean) uartinterface.isconnected()),toast.length_short).show();                 log.d("onclick", "200");                 configbutton.setenabled(false);             }         }      }  }   public void onhomepressed() {     onbackpressed(); }  public void onbackpressed() {     super.onbackpressed(); }  protected void onresume() {     super.onresume();     if (2 == uartinterface.resumeusblist()) {         uartinterface.closedevice();         log.d(tag, "enter onresume error");     } }  protected void onpause() {     super.onpause(); }  protected void onstop() {     if (read_enable == true) {         read_enable = false;     }     super.onstop(); }  protected void ondestroy() {     if (uartinterface != null) {         if (uartinterface.isconnected()) {             uartinterface.closedevice();         }         uartinterface = null;     }      super.ondestroy(); }  final handler handler = new handler() {     @override     public void handlemessage(message msg) {          if (actualnumbytes != 0x00) {             readtext.append(string.copyvalueof(readbuffer, 0,                     actualnumbytes));             toast.maketext(global_context,"269k" + ((boolean) uartinterface.isconnected()),toast.length_short).show();             actualnumbytes = 0;         }      } };  /* usb input data handler */ private class readthread extends thread {     handler mhandler;      /* constructor */     handler mhandler;      readthread(handler h) {         mhandler = h;         this.setpriority(thread.min_priority);     }      public void run() {         while (read_enable) {             message msg = mhandler.obtainmessage();             try {                 thread.sleep(50);             } catch (interruptedexception e) {             }             // log.d(tag, "thread");             synchronized (threadlock) {                 if (uartinterface != null) {                     actualnumbytes = uartinterface.readdata(readbuffer, 64);                      if (actualnumbytes > 0) {                         mhandler.sendmessage(msg);                     }                 }             }         }     } }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.uart_loop_back, menu);     return true; } } 

upto line 74 (toast.maketext(global_context,"155k" + ((boolean) uartinterface.isconnected()),toast.length_short).show();) found returns false when onclick() called return true. why if body has answer pls check it. thanks

the method resumeusblist() enables usb connection , changes isconnected() true. if resumeusblist() fails returns 2

check activity's onresume()