ProgressDialog and AsyncTask

Example of ProgressDialog, work with AsyncTask.

package com.example.android_er.androidprogressdialog;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;


public class MainActivity extends ActionBarActivity {

    Button btnStart;

    MyAsyncTask myAsyncTask;

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

        btnStart=(Button)findViewById(R.id.start);
        btnStart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,
                        "- Start -",
                        Toast.LENGTH_LONG).show();

                myAsyncTask = new MyAsyncTask();
                myAsyncTask.execute();

            }
        });
    }

    class MyAsyncTask extends AsyncTask<Void, Integer, Void>{

        boolean running;
        ProgressDialog progressDialog;

        @Override
        protected Void doInBackground(Void... params) {
            int i = 10;
            while(running){
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

                if(i-- == 0){
                    running = false;
                }

                publishProgress(i);

            }
            return null;
        }

        @Override
        protected void onProgressUpdate(Integer... values) {
            super.onProgressUpdate(values);
            progressDialog.setMessage(String.valueOf(values[0]));
        }

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
            running = true;

            progressDialog = ProgressDialog.show(MainActivity.this,
                    "ProgressDialog",
                    "Wait!");

            progressDialog.setCanceledOnTouchOutside(true);
            progressDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
                @Override
                public void onCancel(DialogInterface dialog) {
                    running = false;
                }
            });

            Toast.makeText(MainActivity.this,
                    "Progress Start",
                    Toast.LENGTH_LONG).show();
        }

        @Override
        protected void onPostExecute(Void aVoid) {
            super.onPostExecute(aVoid);
            Toast.makeText(MainActivity.this,
                    "Progress Ended",
                    Toast.LENGTH_LONG).show();

            progressDialog.dismiss();
        }

    }

}

<LinearLayout 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"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />

    <Button
        android:id="@+id/start"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Start"/>

</LinearLayout>

more:
- Too busy in background thread of AsyncTask