Question

I have a ListView in Activity1. OnItemClick, I’m navigating to another activity Activity2 where I have some database code.

Now the problem is fetching data from DB is taking some time, so while navigating from Activity1 to Activity2, for few seconds blank screen appears.

To overcome this, I tried ProgressDialog but ProgressDialog is not appearing at all.

Code snippet from Activity 2:

public class Activity2 extends Activity implements Runnable {
@Override
public void onCreate(Bundle savedInstanceState) {
Thread thread = new Thread();
        thread.start();
        run();
}

---

@Override
    public void run() {
        plansDesc = dbMgr.chkRecord(
                "SELECT Description FROM SubPlan where Title='" + subTitle
                        + "'", "Description");

        ProgressDialog progDailog = ProgressDialog.show(
                SubPlanDescActivity.this, "Plan Information", "Loading...",
                true);
        try {
            if (plansDesc != "") {
                tvDesc.setText(Html.fromHtml(plansDesc));
            } else {
                tvDesc.setText(Html
                        .fromHtml("<b>No Information Available...</b>"));
            }
        } catch (Exception e) {
        }
        handler.sendEmptyMessage(0);
        progDailog.dismiss();
    }

private Handler handler = new Handler() {
    @Override
    public void handleMessage(Message msg) {
    }
};

ANY HELP APPRECIATED.

Answer 1

Try AsyncTask instead of thread

See the below code

@Override
public void onCreate(Bundle savedInstanceState) {
   new ProgressTask().execute();
}

Now create class

private class ProgressTask extends AsyncTask<String, Void, Boolean> {

  private ProgressDialog dialog = new ProgressDialog(HomeActivity.this);

  protected void onPreExecute() {
    this.dialog.setMessage("Please wait");
    this.dialog.show();
  }

  protected Boolean doInBackground(final String... args) {
    try {

        plansDesc = dbMgr.chkRecord(
            "SELECT Description FROM SubPlan where Title='" + subTitle
                    + "'", "Description");
        return true;
    } catch (Exception e) {
        Log.e("tag", "error", e);
        return false;
    }
  }

  @Override
  protected void onPostExecute(final Boolean success) {

    if (dialog.isShowing()) {
        dialog.dismiss();
    }

    if (success) {
        // display UI
        if (plansDesc != "") {
            tvDesc.setText(Html.fromHtml(plansDesc));
        } else {
            tvDesc.setText(Html
                    .fromHtml("<b>No Information Available...</b>"));
        }
    }
  }
}