Use of Android Learning note-handler

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Click the Start button to print a word in logcat every 3 seconds

<button android:id= "@+id/startbutton" android:layout_width= "Fill_parent" android:layout_height= "W Rap_content "android:text=" Start "/> <button android:id=" @+id/endbutton "Android:layout_widt H= "Fill_parent" android:layout_height= "wrap_content" android:layout_below= "@id/startbutton" android:t ext= "End"/>

Mainactivity.java

package com.example.handler_01;import android.support.v7.app.actionbaractivity;import  android.os.bundle;import android.os.handler;import android.view.menu;import  android.view.menuitem;import android.view.view;import android.view.view.onclicklistener;import  Android.widget.button;public class mainactivity extends actionbaractivity {private  Button startButton = null;private Button endButton = null; Handler handler = new handler (); @Overrideprotected  void oncreate (bundle  savedinstancestate)  {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); startbutton =  (Button)  findviewbyid (R.id.startbutton);endbutton =  (button)   Findviewbyid (R.id.endbutton); Startbutton.setonclicklistener (New startbuttonlistener ()); Endbutton.setonclicklistener (New endbuttonlistener ());} Class startbuttonlistener implements onclicklistener{@Overridepublic  void onclick (view v)  {handler.post (Updatethread);}} class endbuttonlistener implements onclicklistener{@Overridepublic  void onclick (View  V)  {handler.removecallbacks (Updatethread);}} Runnable updatethread = new runnable ()  {@Overridepublic  void run ()  { System.out.println ("Updatethread"); handler.postdelayed (updatethread, 3000);};}

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Use of Android Learning note-handler