Java Android Program to Demonstrate AsynChronous Tasks in Android

package com.example.asynchrounous_tasks;
 
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
 
public class MainActivity extends Activity {
    String input = "redrum ... redrum";
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button start = (Button) findViewById(R.id.button1);
        start.setOnClickListener(new View.OnClickListener() {
 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
 
                MyAsyncTask task = new MyAsyncTask();
                task.execute(input);
            }
        });
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
 
}

package com.example.asynchrounous_tasks;
 
import android.annotation.SuppressLint;
import android.os.AsyncTask;
import android.widget.Toast;
 
@SuppressLint("ShowToast")
class MyAsyncTask extends AsyncTask<String, Integer, String> {
    @Override
    protected String doInBackground(String... parameter) {
        // Moved to a background thread.
        String result = "";
        int myProgress = 0;
        int inputLength = parameter[0].length();
        // Perform background processing task, update myProgress]
        for (int i = 1; i <= inputLength; i++) {
            myProgress = i;
            result = result + parameter[0].charAt(inputLength - i);
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
            }
            publishProgress(myProgress);
        }
        // Return the value to be passed to onPostExecute
        return result;
    }
 
    @Override
    protected void onProgressUpdate(Integer... progress) {
        // Synchronized to UI thread.
        // Update progress bar, Notification, or other UI elements
        // asyncProgress.setProgress(progress[0]);
        Toast.makeText(null, "in progress update" + progress[0],
                Toast.LENGTH_LONG).show();
    }
 
    @Override
    protected void onPostExecute(String result) {
        // Synchronized to UI thread.
        // Report results via UI update, Dialog, or notifications
    //    asyncTextView.setText(result);
        Toast.makeText(null, result, Toast.LENGTH_LONG).show();
    }
}