java - Unable to change text of TextView inside of a Fragment from same activity -


i trying change textview give status of bluetooth connection within fragment, nothing seems happen when msgreceived.settext(string) called. how go doing this? here java file fragment:

package dleedesign.dubcommunicationstestapp;  import android.app.fragment; import android.bluetooth.bluetoothadapter; import android.os.bundle; import android.os.handler; import android.os.message; import android.support.annotation.nullable; import android.view.layoutinflater; import android.util.log; import android.view.view; import android.view.viewgroup; import android.widget.button; import android.widget.textview;  public class secondfragment extends fragment implements view.onclicklistener {  view myview;  public final string tag = "main"; private bluetooth bt; public button sendcommand; public textview msgreceived;  @nullable @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {     myview = inflater.inflate(r.layout.second_layout, container, false);      sendcommand = (button) inflater.inflate(r.layout.second_layout, container, false).findviewbyid(r.id.sendcommand);     msgreceived = (textview) inflater.inflate(r.layout.second_layout, container, false).findviewbyid(r.id.msgreceived);     msgreceived.settext("ready connect");      bt = new bluetooth(new mainactivity(), mhandler);     connectservice();      return myview; }  @override public void onclick(view v) {     connectservice(); }  public void connectservice() {     try {         msgreceived.settext("connecting...");         bluetoothadapter btadapter = bluetoothadapter.getdefaultadapter();         if(btadapter.isenabled())         {             bt.start();             bt.connectdevice("hc-06");             log.d(tag, "btservice started- listening");             msgreceived.settext("connected!");         }         else         {             log.w(tag, "btservice started - bluetooth not enabled");             msgreceived.settext("bluetooth not enabled");         }     } catch (exception e) {         log.e(tag, "unable start bluetooth", e);         msgreceived.settext("unable connect: " + e);     } }  private final handler mhandler = new handler() {     @override     public void handlemessage(message msg)     {         switch (msg.what)         {             case bluetooth.message_state_change:                 log.d(tag, "message_state_change: " + msg.arg1);                 break;             case bluetooth.message_write:                 log.d(tag, "message_write");                 break;             case bluetooth.message_read:                 log.d(tag, "message_read");                 break;             case bluetooth.message_device_name:                 log.d(tag, "message_device_name " + msg);                 break;             case bluetooth.message_toast:                 log.d(tag, "message_toast " + msg);                 break;         }     } };  }

edit: here logcat message spits out when select secondfragment:

dleedesign.dubcommunicationstestapp d/bluetoothservice: bounded device 40:ef:4c:c2:a9:32 dleedesign.dubcommunicationstestapp d/bluetoothservice: bounded device 98:d3:31:70:80:c5 dleedesign.dubcommunicationstestapp d/bluetoothservice: start dleedesign.dubcommunicationstestapp d/bluetoothservice: setstate() 0 -> 1 dleedesign.dubcommunicationstestapp w/bluetoothadapter: getbluetoothservice() called no bluetoothmanagercallback dleedesign.dubcommunicationstestapp d/bluetoothservice: socket type: nullbegin macceptthreadthread[thread-20627,5,main] dleedesign.dubcommunicationstestapp d/bluetoothservice: connect to: 98:d3:31:70:80:c5 dleedesign.dubcommunicationstestapp d/bluetoothservice: setstate() 1 -> 2 dleedesign.dubcommunicationstestapp d/main: btservice started- listening dleedesign.dubcommunicationstestapp i/bluetoothservice: begin mconnectthread sockettype:null dleedesign.dubcommunicationstestapp w/bluetoothadapter: getbluetoothservice() called no bluetoothmanagercallback dleedesign.dubcommunicationstestapp d/main: message_state_change: 1 dleedesign.dubcommunicationstestapp d/main: message_state_change: 2 dleedesign.dubcommunicationstestapp e/bluetoothservice: unable connect socket                                                                                         java.io.ioexception: read failed, socket might closed or timeout, read ret: -1                                                                                            @ android.bluetooth.bluetoothsocket.readall(bluetoothsocket.java:517)                                                                                            @ android.bluetooth.bluetoothsocket.readint(bluetoothsocket.java:528)                                                                                            @ android.bluetooth.bluetoothsocket.connect(bluetoothsocket.java:320)                                                                                            @ dleedesign.dubcommunicationstestapp.bluetooth$connectthread.run(bluetooth.java:408) dleedesign.dubcommunicationstestapp d/bluetoothservice: start dleedesign.dubcommunicationstestapp d/bluetoothservice: setstate() 2 -> 1 dleedesign.dubcommunicationstestapp d/main: message_toast { when=-15ms what=5 target=dleedesign.dubcommunicationstestapp.secondfragment$1 } dleedesign.dubcommunicationstestapp d/main: message_state_change: 1

whats happening you're trying inflate view given layout each time findviewbyid , casting textview. calling findviewbyid on different view you're returning. should first inflate layout did in first line 

myview = inflater.inflate....

and then,

msgreceived = (textview) myview.findviewbyid(r.id.msgreceived);

(same other textview, button etc trying use)


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