Android Thread implementation Random draw

import android.app.activity;import android.os.bundle;import android.os.handler;import  android.view.menu;import android.view.menuitem;import android.view.view;import  android.widget.textview;public class mainactivity extends activity {textview  TextView; handler handler; runnable runnable;boolean stop = true; @Overrideprotected  void oncreate (Bundle  savedinstancestate)  {super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); textview =  (TextView)  findviewbyid (R.id.text); Handler = new handler (); runnable  = new runnable ()  {@Overridepublic  void run ()  {int a =  (int)   (Math.random ()  * 10), Textview.settext (a +  ""); handler.postdelayed (RUNNABLE, 50) ;}};} Public void start (View view)  {if  (stop)  {handler.postdelayed (runnable, 0); Stop&nbsP;= !stop;}  else {handler.removecallbacks (runnable); stop = !stop;}}

Android Thread implementation Random draw