activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@string/hello_world" />

</RelativeLayout>

MainActivity.java

package com.example.andrunnable;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.widget.TextView;


public class MainActivity extends Activity implements Runnable {

	private int  counter = 0;
	
	public void run() {
	      
		  	while(counter < 100){
		  		
		  	  try {
		              Thread.sleep(30000);
		      } catch (InterruptedException e) {}

		  	  counter += 1;	
		      handler.sendEmptyMessage(0);

		      
		  	}
	}

		   private Handler handler = new Handler() {
		      public void handleMessage(Message msg) {
		    	  
		          TextView textView = (TextView) findViewById(R.id.textView0);  
		          textView.setText("counter="+counter);  
		      }
		   };

		  
	
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		 Thread thread = new Thread(this);
	      thread.start();   
	}

	
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}
	
	

}