multithreading - App crashes, when a thread is executed, Android? -


i trying update textview in time interval. ie texts changes time changes.the contents stored in array, when try thread , app crashes . here source code:

import android.content.intent; import android.graphics.typeface; import android.net.uri; import android.support.v4.app.dialogfragment; import android.support.v7.app.appcompatactivity; import android.os.bundle; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.window; import android.widget.imageview; import android.widget.textview;  import java.util.calendar;   public class mainactivity extends appcompatactivity {  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);       final messagelist sample = new messagelist();     sample.messagemethod();      final calendar c = calendar.getinstance();         new thread(new runnable() {         @override         public void run()         {              int x = 0;              while (i<1)             {               if(c.get(calendar.minute)%2==0)               {                   ++x;                   textview alertmessage =     (textview)findviewbyid(r.id.messages);                   string parse = sample.message[x];                   alertmessage.settext(parse);                }              }            }     }).start();

the app working before using thread, don't know if it's due error in initializing. suggestions?

you have run part of code in ui thread:

 textview alertmessage = (textview)findviewbyid(r.id.messages);  string parse = sample.message[x];  alertmessage.settext(parse);

it should like:

new thread(new runnable(){     @override     public void run(){      int x=0;       while(i<1){             if(c.get(calendar.minute)%2==0){             ++x;             runonuithread(new runnable(){              @override              public void run(){               textview alertmessage=(textview)findviewbyid(r.id.messages);               string parse=sample.message[x];               alertmessage.settext(parse);              }        });        } } } }).start();

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