android - Implementing Runnable in MainActivity -

i have activity prints custom date time string textview. implemented runnable interface in mainactivity self , created thread @ end of oncreate method.

thread thread = new thread(this); thread.run(); 

this run method

public void run() {          while (true) {             try {                 thread.sleep(1000);                 localtime.settext(localtime.gettime().format2445());                 system.out.println(localtime.gettime().format2445());             } catch (interruptedexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }          }      }  

when run on emulator can see system out in logcat. emulator shows anr after 5 seconds. doing wrong. method not suitable? async task way go here? need update clock every second having asynctask run forever acceptable pattern?

you need start thread.start()

http://developer.android.com/reference/java/lang/thread.html

quoting docs

there 2 ways execute code in new thread. can either subclass thread , overriding run() method, or construct new thread , pass runnable constructor. in either case, start() method must called execute new thread..

you calling thread.run(). calling sleep . should not block ui thread.

http://developer.android.com/training/articles/perf-anr.html

if looking count down timer

http://developer.android.com/reference/android/os/countdowntimer.html

countdowntimer in minutes , seconds.

you can use handler, timer task. if use timer task make sure udate ui on ui thread.

android thread timer

edit: failed notice this. above comments. credits doctordrive

    localtime.settext(localtime.gettime().format2445()); // update ui thread not possible 

you need use runonuithread

    runonuithread(new runnable() //run on ui thread              {               public void run()                {                  localtime.settext(localtime.gettime().format2445());                }              });