Answer to: http://stackoverflow.com/questions/28059316/android-downloadtask-how-to-put-source-code-in-dialog-box

gistfile1.txt

private class DownloadTask extends AsyncTask<String, Void, String> {

    @Override
    protected String doInBackground(String... urls) {
        HttpResponse response = null;
        HttpGet httpGet = null;
        HttpClient mHttpClient = null;
        String s = "";

        // check if the url is invalid
        if (urls == null || urls.length == 0)
            return null;
            
        try {
        
            if(mHttpClient == null) {
                mHttpClient = new DefaultHttpClient();
            }


            httpGet = new HttpGet(urls[0]);
            response = mHttpClient.execute(httpGet);
            s = EntityUtils.toString(response.getEntity(), "UTF-8");

        } catch (IOException e) {
            e.printStackTrace();
        } 
        
        return s;
    }
    
    @Override
	protected void onPostExecute(String... strings) {
	    // show your dialog here
	    // please do check null first
	    if (strings == null || strings.length == 0)
	        return;
	    
	    new AlertDialog.Builder(PrintDemo.this)
	        .setTitle("Message")
	        .setMessage(strings[0])
	        .setPositiveButton(android.R.string.ok, null)
	        .setCancelable(false)
	        .create()
	        .show();
	}
}