Display the Progress of an Operation

package com.java2s.app;
//  ww  w .jav  a2s. c  o  m
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {
    ProgressDialog progressDialog;

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

        progressDialog = new ProgressDialog(this);
        progressDialog.setIcon(R.drawable.ic_launcher);
        progressDialog.setTitle("Downloading files...");
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "OK",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {
                        Toast.makeText(getBaseContext(),
                                "OK clicked!", Toast.LENGTH_SHORT).show();
                    }
                }
        );
        progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,
                                        int whichButton) {
                        Toast.makeText(getBaseContext(),
                                "Cancel clicked!", Toast.LENGTH_SHORT).show();
                    }
                }
        );
        progressDialog.show();
        progressDialog.setProgress(0);

        new Thread(new Runnable() {
            public void run() {
                for (int i = 1; i <= 15; i++) {
                    try {
                        //---simulate doing something lengthy---
                        Thread.sleep(1000);
                        //---update the dialog---
                        progressDialog.incrementProgressBy((int) (100 / 15));
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                progressDialog.dismiss();
            }
        }).start();
    }
}