Android sample using Thread, Handler

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" />

    <Button
        android:id="@+id/button0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="stop"
        android:layout_gravity="center">
 </Button>
    
    
</RelativeLayout>

MainActivity.java

package com.example.andrunnable2;


import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;



public class MainActivity extends Activity implements OnClickListener,Runnable{

	 private int  counter = 0;
	 private boolean end_flg = true;
	 private Button button0;
	
	
	public void run() {
	      
		  	while(! end_flg){
		  		
		  	  try {
		              Thread.sleep(3000);
		      } 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
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		end_flg = false;

		   button0=(Button)findViewById(R.id.button0);
		   button0.setOnClickListener(this);


	   	 Thread thread = new Thread(this);
	     thread.start();   
			
		
	}
	
	public void onClick(View v){

    	end_flg=true;
    	//finish();
        }	
}