Android Thread and Handler

package com.myapp;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.text.Html;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Button;
import android.graphics.*;

public class MainActivity extends Activity {

	private Handler handler = new Handler();
	RadioButton rdo1;
	RadioButton rdo2;
	RadioButton rdo3;
	TextView result;

	String resultOut = "";

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		// rdo1 Red
		rdo1 = (RadioButton) findViewById(R.id.rdo1);
		rdo1.setTextColor(Color.RED);
		// rdo2 Blue
		rdo2 = (RadioButton) findViewById(R.id.rdo2);
		rdo2.setTextColor(Color.BLUE);
		// rdo3 Blue
		rdo3 = (RadioButton) findViewById(R.id.rdo3);
		rdo3.setTextColor(Color.GREEN);

		// txtResult
		result = (TextView) findViewById(R.id.txtResult);

		// button1
		Button btn = (Button) findViewById(R.id.button1);
		btn.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				// Perform action on click
				if (rdo1.isChecked()) {
					startProgress("RED");
				} else if (rdo2.isChecked()) {
					startProgress("BLUE");
				} else if (rdo3.isChecked()) {
					startProgress("GREEN");
				}
			}
		});

	}

	public void startProgress(final String color) {

		Runnable runnable = new Runnable() {

			public void run() {

				final String threadColor = color;

				for (int i = 0; i <= 10; i++) {
					final int value = i;
					try {
						Thread.sleep(2000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					handler.post(new Runnable() {
						public void run() {
							// Handler thread
							String curThread = "<br><font color='"
									+ threadColor.toString() + "'>Thread <b>"
									+ threadColor.toString() + "</b>"
									+ ": Process i=" + value + "</font>";
							resultOut = resultOut + curThread;
							result.setText(Html.fromHtml(resultOut));
						}
					});
				}
			}
		};
		new Thread(runnable).start();
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}

				for (int i = 0; i <= 10; i++) {
					final int value = i;
					try {
						Thread.sleep(2000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
					handler.post(new Runnable() {
						public void run() {
							// Handler thread
							String curThread = "<br><font color='"
									+ threadColor.toString() + "'>Thread <b>"
									+ threadColor.toString() + "</b>"
									+ ": Process i=" + value + "</font>";
							resultOut = resultOut + curThread;
							result.setText(Html.fromHtml(resultOut));
						}
					});
				}