Example of AsyncTask in Android

MyAsync.java

public class MyAsync extends AsyncTask {

       private Context mContext;

       public MyAsync(Context context) {
           //Relevant Context should be provided to newly created components (whether application context or activity context)
           //getApplicationContext() - Returns the context for all activities running in application 
           mContext = context.getApplicationContext();
       }

       //Execute this before the request is made 
       @Override
       protected void onPreExecute() {
           // A toast provides simple feedback about an operation as popup. 
           // It takes the application Context, the text message, and the duration for the toast as arguments
           Toast.makeText(mContext, "Going for the network call..", Toast.LENGTH_LONG).show();
       }

       //Perform the request in background 
       @Override
       protected Integer doInBackground(String... params) {
           HttpURLConnection connection;
           try {
               //Open a new URL connection 
               connection = (HttpURLConnection) new URL(params[0])
                       .openConnection();
               
               //Defines a HTTP request type        
               connection.setRequestMethod("POST");

               //Sets headers: Content-Type, Authorization 
               connection.setRequestProperty("Content-Type", "application/json");
               connection.setRequestProperty("Accept", "application/json");
               connection.setRequestProperty("Authorization", "Token fab11c9b6bd4215a989c5bf57eb678");
               
               //Add POST data in JSON format
               JSONObject jsonParam = new JSONObject();
               try {
                   jsonParam.put("campaign_id", "4193");
               } catch (JSONException e) {
                   e.printStackTrace();
               }

               //Create a writer object and make the request
               OutputStreamWriter outputStream = new OutputStreamWriter(connection.getOutputStream());
               outputStream.write(jsonParam.toString());
               outputStream.flush();
               outputStream.close();

               //Get the Response code for the request  
               return connection.getResponseCode();
           } catch (IOException e) {
               e.printStackTrace();
           }
           return -1;
       }

       //Run this once the background task returns. 
       @Override
       protected void onPostExecute(Integer integer) {
           //Print the response code as toast popup 
           Toast.makeText(mContext, "Response code: " + integer,
                   Toast.LENGTH_LONG).show();

       }
}

Chetangiridhar,
Thanks for sharing this code. I'm playing with it now but I can't get the mContext method to fire to initialize it to something other than null.
What am I missing to get this method to fire?

public MyAsync(Context context) {
//Relevant Context should be provided to newly created components (whether application context or activity context)
//getApplicationContext() - Returns the context for all activities running in application
mContext = context.getApplicationContext();
}

Thanks,
-Steve (Android novice)