android - sendMessage() is not defined -

i trying create example know how handlers work. shown in code belwo, created workerthread runs ever , increment variable i. within run() method, want pass value of incremented variable textview shown in body of handler class.

the problem is, line in there "new handler()" , "handler.sendmessage(m)" marked red

please let me know how solve problem

mainactivity

public class mainactivity extends appcompatactivity {  private final static string tag = mainactivity.class.getclass().getsimplename(); private textview mtvincr = null;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      this.mtvincr = (textview) findviewbyid(r.id.tvvalue);     new workerthread().start(); }  handler handler =new handler() {//error     @override     public void handlemessage(message msg) {         int sentint = msg.getdata().getint("what");         mtvincr.settext("r:"+integer.tostring(sentint));     } };  class workerthread extends thread {      private int = 0;     android.os.handler mhandler = null;      @override     public void run() {         super.run();          looper.prepare();          while(true) {             log.d(tag, subtag.bullet("workerthread", "i: " + (i++)));             systemclock.sleep(1000);              message m = new message();             bundle b = new bundle();             b.putint("what", i); // example             m.setdata(b);             handler.sendmessage(m);//error         }     } } } 

use message.obtain() message object

while constructor of message public, best way 1 of these call message.obtain() or 1 of handler.obtainmessage() methods, pull them pool of recycled objects.

and use obj attribute msg.obj = b;

obj: arbitrary object send recipient.

info from:

https://developer.android.com/reference/android/os/message.html

example:

handler handler =new handler() {     @override     public void handlemessage(message msg) {         int sentint = ((bundle)msg.obj).getint("what");         mtvincr.settext("r:"+integer.tostring(sentint));     } };   class workerthread extends thread {      private int = 0;     android.os.handler mhandler = null;      @override     public void run() {         super.run();          looper.prepare();          while(true) {             log.d(tag, subtag.bullet("workerthread", "i: " + (i++)));             systemclock.sleep(1000);              message msg = message.obtain();             bundle b = new bundle();             b.putint("what", i); // example             msg.obj = b;             handler.sendmessage(msg);         }     } }