Android Handler Simple Example

Package Com.firstapp.foo.firstapp;import Android.os.handler;import android.os.message;import Android.support.v7.app.appcompatactivity;import Android.os.bundle;import Android.util.log;import Android.widget.button;import android.widget.progressbar;import android.widget.textview;import java.util.Date; Public classThreaddemoactivity extends Appcompatactivity {Private StaticFinal String TAG ="Foo"; PrivateProgressBar Bar; PrivateButton Btnstartthread; PrivateTextView tvmsg; PrivateHandler Handler; @Overrideprotected voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Handler=NewMyHandler ();        Setcontentview (R.layout.activity_thread_demo); Bar=(ProgressBar) Findviewbyid (R.id.progressbar); Btnstartthread=(Button) Findviewbyid (R.id.btnstartthread); Tvmsg=(TextView) Findviewbyid (r.id.tvmsg); Btnstartthread.setonclicklistener (v- {            NewThread ((){                 for(intI=0; i< -; i++) {bar.setprogress (i); Try{Thread.Sleep ( -); } Catch(interruptedexception e) {e.printstacktrace (); } log.i (TAG,"Thread Info:"+i); } Bundle Bundle=NewBundle (); Bundle.putstring ("msg","Hello"); //Other ...Message message =Handler.obtainmessage (); Message.what=2;                Message.setdata (bundle);                Handler.sendmessage (message); /*If the message has no additional parameters except the message code, the following sentence is more convenient*/                //Handler.sendemptymessage (2);}). Start ();    }); }    classMyHandler extends Handler {@Override Public voidhandlemessage (Message msg) {Switch(msg.what) { Case 2: Bundle Data=Msg.getdata (); String txt= Data.getstring ("msg"); Tvmsg.settext (TXT+", Thread completion:"+NewDate (). toString ());  Break; }        }    }}

Android Handler Simple Example