Android, thread once last one

String lastKey = null;

...

public void method1(){

         lastKey = Calendar.getInstance().getTimeInMillis()+"";
         final String key = lastKey;

           final Handler handler = new Handler();
            handler.postDelayed(new Runnable() {
                @Override                public void run() {
                    if(key.equals(shutdownKey)){
                        // doSomething
                    }
                }
            }, 1000);

}