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POXml parsing with AsyncTask slower than parsing in main Thread
 

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  1. POXml parsing with AsyncTask slower than parsing in main Thread
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    <p>I'm having a strange behaviour in my code: parsing a local xml file on simulator with asyncTask takes longer than parsing it on main thread.</p> <p>Here is my code with AsyncTask:</p> <pre><code>public class MostraTutti extends SherlockActivity { ListView lv; final List&lt;ListViewItem&gt; items = new ArrayList&lt;MostraTutti.ListViewItem&gt;(); final ArrayList&lt;String&gt; nome = new ArrayList&lt;String&gt;(); final ArrayList&lt;String&gt; immagine = new ArrayList&lt;String&gt;(); ... final int array_image2[] ={R.drawable.iodocloroidrossichinolina,R.drawable.acidoacetilsalicilico, ...}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mostra_tutti); lv = (ListView) findViewById(R.id.listView); getSupportActionBar().setDisplayShowHomeEnabled(false); RssFeedTask rssTask = new RssFeedTask(); rssTask.execute(); } private class RssFeedTask extends AsyncTask&lt;String, Void, String&gt; { private ProgressDialog Dialog; String response = ""; @Override protected void onPreExecute() { Dialog = new ProgressDialog(MostraTutti.this); Dialog.setMessage("Leggo le sostanze..."); Dialog.show(); } @Override protected String doInBackground(String... urls) { InputStream xmlFile = getResources().openRawResource(R.raw.sostanze); try { DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); final Document document = documentBuilder.parse(xmlFile); document.getDocumentElement().normalize(); NodeList nodeList = document.getElementsByTagName("sostanza"); for (int i = 0; i &lt; nodeList.getLength(); i++) { final int indice = i; nome.add(document.getElementsByTagName("nome").item(indice).getTextContent()); iupac.add(document.getElementsByTagName("iupac").item(indice).getTextContent()); aspetto.add(document.getElementsByTagName("aspetto").item(indice).getTextContent()); formula.add(document.getElementsByTagName("formula").item(indice).getTextContent()); immagine.add(document.getElementsByTagName("immagine").item(indice).getTextContent()); appartenenza.add(document.getElementsByTagName("appartenenza").item(indice).getTextContent()); spiegazione.add(document.getElementsByTagName("spiegazione").item(indice).getTextContent()); tempFus.add(document.getElementsByTagName("temperaturaFusione").item(indice).getTextContent()); tempEboll.add(document.getElementsByTagName("temperaturaEbollizione").item(indice).getTextContent()); solubilita.add(document.getElementsByTagName("solubilita").item(indice).getTextContent()); note.add(document.getElementsByTagName("eccezioni").item(indice).getTextContent()); String str = document.getElementsByTagName("formula").item(indice).getTextContent(); str = str.replaceAll("0", "\u2080"); str = str.replaceAll("1", "\u2081"); str = str.replaceAll("2", "\u2082"); str = str.replaceAll("3", "\u2083"); str = str.replaceAll("4", "\u2084"); str = str.replaceAll("5", "\u2085"); str = str.replaceAll("6", "\u2086"); str = str.replaceAll("7", "\u2087"); str = str.replaceAll("8", "\u2088"); str = str.replaceAll("9", "\u2089"); final String stringa = str; formulaConvertita.add(stringa); //CustomListViewAdapter adapter = new CustomListViewAdapter(MostraTutti.this,items); //lv.setAdapter(adapter); items.add(new ListViewItem() {{ ThumbnailResource = array_image2[indice]; Title = document.getElementsByTagName("nome").item(indice).getTextContent(); SubTitle = stringa; }}); }; } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } return response; } @Override protected void onPostExecute(String result) { Dialog.dismiss(); CustomListViewAdapter adapter = new CustomListViewAdapter(MostraTutti.this,items); lv.setAdapter(adapter); lv.setOnItemClickListener( new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; arg0, View v, int position, long id) { Context context = getBaseContext(); Intent myIntent = new Intent(context, Dettagli.class); myIntent.putExtra("nome_sostanza",nome.get(position)); // myIntent.putExtra("formula",formula.get(position)); myIntent.putExtra("iupac",iupac.get(position)); myIntent.putExtra("aspetto",aspetto.get(position)); myIntent.putExtra("appartenenza",appartenenza.get(position)); myIntent.putExtra("solubilita",solubilita.get(position)); myIntent.putExtra("tempFus",tempFus.get(position)); myIntent.putExtra("tempEboll",tempEboll.get(position)); myIntent.putExtra("spiegazione",spiegazione.get(position)); myIntent.putExtra("immagine", array_image2[position]); myIntent.putExtra("formulaConvertita", formulaConvertita.get(position)); myIntent.putExtra("note", note.get(position)); startActivityForResult(myIntent, 0); } } ); } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getSupportMenuInflater().inflate(R.menu.activity_main, menu); return true; } class ListViewItem { public int ThumbnailResource; public String Title; public String SubTitle; } } </code></pre> <p>And here's my code with no AsyncTask:</p> <pre><code>public class MostraTutti extends SherlockActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mostra_tutti); getSupportActionBar().setDisplayShowHomeEnabled(false); final ListView lv = (ListView) findViewById(R.id.listView); final List&lt;ListViewItem&gt; items = new ArrayList&lt;MostraTutti.ListViewItem&gt;(); final ArrayList&lt;String&gt; nome = new ArrayList&lt;String&gt;(); final ArrayList&lt;String&gt; immagine = new ArrayList&lt;String&gt;(); ... final int array_image2[] ={R.drawable.iodocloroidrossichinolina,R.drawable.acidoacetilsalicilico, ...}; </code></pre> <p>InputStream xmlFile = getResources().openRawResource(R.raw.sostanze);</p> <pre><code> try { DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder(); final Document document = documentBuilder.parse(xmlFile); document.getDocumentElement().normalize(); //tagHandler.handleChannelTag(document); NodeList nodeList = document.getElementsByTagName("sostanza"); for (int i = 0; i &lt; nodeList.getLength(); i++) { final int indice = i; nome.add(document.getElementsByTagName("nome").item(indice).getTextContent()); iupac.add(document.getElementsByTagName("iupac").item(indice).getTextContent()); aspetto.add(document.getElementsByTagName("aspetto").item(indice).getTextContent()); formula.add(document.getElementsByTagName("formula").item(indice).getTextContent()); immagine.add(document.getElementsByTagName("immagine").item(indice).getTextContent()); appartenenza.add(document.getElementsByTagName("appartenenza").item(indice).getTextContent()); spiegazione.add(document.getElementsByTagName("spiegazione").item(indice).getTextContent()); tempFus.add(document.getElementsByTagName("temperaturaFusione").item(indice).getTextContent()); tempEboll.add(document.getElementsByTagName("temperaturaEbollizione").item(indice).getTextContent()); solubilita.add(document.getElementsByTagName("solubilita").item(indice).getTextContent()); note.add(document.getElementsByTagName("eccezioni").item(indice).getTextContent()); String str = document.getElementsByTagName("formula").item(indice).getTextContent(); str = str.replaceAll("0", "\u2080"); str = str.replaceAll("1", "\u2081"); str = str.replaceAll("2", "\u2082"); str = str.replaceAll("3", "\u2083"); str = str.replaceAll("4", "\u2084"); str = str.replaceAll("5", "\u2085"); str = str.replaceAll("6", "\u2086"); str = str.replaceAll("7", "\u2087"); str = str.replaceAll("8", "\u2088"); str = str.replaceAll("9", "\u2089"); final String stringa = str; formulaConvertita.add(stringa); items.add(new ListViewItem() {{ ThumbnailResource = array_image2[indice]; Title = document.getElementsByTagName("nome").item(indice).getTextContent(); SubTitle = stringa; }}); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (ParserConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } CustomListViewAdapter adapter = new CustomListViewAdapter(this,items); lv.setAdapter(adapter); lv.setOnItemClickListener( new OnItemClickListener() { public void onItemClick(AdapterView&lt;?&gt; arg0, View v, int position, long id) { Context context = getBaseContext(); Intent myIntent = new Intent(context, Dettagli.class); myIntent.putExtra("nome_sostanza",nome.get(position)); // myIntent.putExtra("formula",formula.get(position)); myIntent.putExtra("iupac",iupac.get(position)); myIntent.putExtra("aspetto",aspetto.get(position)); myIntent.putExtra("appartenenza",appartenenza.get(position)); myIntent.putExtra("solubilita",solubilita.get(position)); myIntent.putExtra("tempFus",tempFus.get(position)); myIntent.putExtra("tempEboll",tempEboll.get(position)); myIntent.putExtra("spiegazione",spiegazione.get(position)); myIntent.putExtra("immagine", array_image2[position]); myIntent.putExtra("formulaConvertita", formulaConvertita.get(position)); myIntent.putExtra("note", note.get(position)); startActivityForResult(myIntent, 0); } } ); } @Override public boolean onCreateOptionsMenu(Menu menu) { getSupportMenuInflater().inflate(R.menu.activity_main, menu); return true; } class ListViewItem { public int ThumbnailResource; public String Title; public String SubTitle; } } </code></pre> <p>The difference on simulator is 16 seconds for the main thread one and 1 minute for the AsyncTask one!</p>
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    1. USLingasamy Sakthivel
    1. USEnzoses
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    1. COYup. Here's what you need. http://stackoverflow.com/a/14217816/1856738
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