Question

i know this is a common question.. i read this site and many tutorial many many times but no chance to do work.

well the code is this:

public class mostraRisultatiActivity extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.mostra_risultati);

    int cnt = 0;
    final TableLayout tl = (TableLayout) findViewById(R.id.tabellaRisultati);

    for (Esame e : Db.risposteDate){
        TableRow tr = new TableRow(this);

        TextView lbl1 = new TextView(this);
        TextView lbl2 = new TextView(this);
        TextView lbl3 = new TextView(this);
        tr.setGravity(Gravity.CENTER);
        lbl1.setGravity(Gravity.CENTER_VERTICAL);
        lbl3.setGravity(Gravity.CENTER);

        lbl1.setTextColor(android.graphics.Color.RED);
        lbl2.setTextColor(android.graphics.Color.RED);
        lbl3.setTextColor(android.graphics.Color.RED);

        lbl1.setLayoutParams( new TableRow.LayoutParams( 0, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 1 ) );
        lbl2.setLayoutParams( new TableRow.LayoutParams( 0, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 7 ) );
        lbl3.setLayoutParams( new TableRow.LayoutParams( 0, android.view.ViewGroup.LayoutParams.WRAP_CONTENT, 1 ) );

        lbl1.setText(e.getDomandaNum()+"");
        lbl2.setText(Html.fromHtml(e.getTesto()+"<br />"));
        lbl3.setText(e.getRispostaData());

        tr.addView(lbl1);
        tr.addView(lbl2);
        tr.addView(lbl3);
        tl.addView(tr);
        if (e.getRispostaData() != null && e.getRispostaData().equals(e.getRispostaReale())){
            cnt++;
            lbl1.setTextColor(android.graphics.Color.GREEN);
            lbl2.setTextColor(android.graphics.Color.GREEN);
            lbl3.setTextColor(android.graphics.Color.GREEN);
        }
    }
    double percentualeSucceso = (cnt*100)/Db.risposteDate.size();

    final TextView risposteTotTV = (TextView) findViewById(R.id.risultatiTot);
    final TextView riassuntorisTV = (TextView) findViewById(R.id.risRiassunto);
    final TextView esitoTV = (TextView) findViewById(R.id.esito);

    risposteTotTV.setText(Html.fromHtml("<b><big>TOT</big></b>" +  "<br />" + 
            Db.risposteDate.size()));
    riassuntorisTV.setText(Html.fromHtml("<b>Risposte corrette: </b>" +cnt+  "<br />" + 
            "Percentuale: "+percentualeSucceso+"%"));
    if (percentualeSucceso >= 90) {
        esitoTV.setText(Html.fromHtml("<b><big>Esito</big></b>  <br />" + 
                                      "<small>PROMOSSO</small>"));
    } else {
        esitoTV.setText(Html.fromHtml("<b><big>Esito</big></b>  <br />" + 
                                      "<small>BOCCIATO</small>"));
    }

}

}

i want a progress bar while load the ui (in particulary the for loop)

i tried with a thread: all work but no progress show until the ui is loaded (useless)
i tried with asyncTask and i have always exception crash.

any idea?

Answer 1

Well, I’ve only tested this solution with a very basic Button, but it worked, so here goes:

You can do the creation and setup of the Views using an AsyncTask. I tried with a button, and any calls that modify/create a View work without problem in an AsyncTask, until you add the view to the layout. Once added, any modifications must be done on the UI thread. So all your setup will happen in doInBackground(), and all the addView() calls will be in onPostExecute(). After onPostExecute(), and more changes to the View will have to be done in an AsyncTask.