AsyncTask in Android Download Example

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.blogspot.kantapp.asynctaskinandroiddownloadexample.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
</RelativeLayout>

MainActivity.java

package com.blogspot.kantapp.asynctaskinandroiddownloadexample;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.widget.Toast;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        MyAsync ma = new MyAsync();
        ma.execute();
    }

    class MyAsync extends AsyncTask<Void, Void, Void>{
        ProgressDialog pd ;
        @Override
        protected void onPreExecute() {

            pd = ProgressDialog.show(MainActivity.this, "downloading", "please wait");

            super.onPreExecute();
        }

        @Override
        protected Void doInBackground(Void... params) {

            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {

                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {

            pd.cancel();

            Toast.makeText(getApplicationContext(), "result published", Toast.LENGTH_SHORT).show();

            super.onPostExecute(result);

        }

    }

}