ProgressBar while loading ListView (using AsyncTask) - android-layout

Question

I'm trying to show a progress bar when loading a custom ListView and afterwards - hide it.
I'm using ASync task, but for some reason - The content view is not set and the previous layout view is stuck until all the list view is loaded.
Here is my code:
private ListView listViewGameResults;
protected View dialogLayout;
protected ArrayList<Game> listGames;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.adresults);
GameResultsLoader gameResultsLoader = new GameResultsLoader();
gameResultsLoader.execute();
}
private class GameResultsLoader extends AsyncTask<Void, Void, Void> {
private GameResultsAdapter adapter;
public GameResultsLoader() {
}
#Override
protected void onPreExecute() {
}
#Override
protected Void doInBackground(Void... params) {
try {
listGames = GameResultsCache.getInstance().getGameResults();
adapter = new GameResultsAdapter(getBaseContext(), listGames);
listViewGameResults = (ListView)findViewById(R.id.listViewGameResults);
}
catch (Exception e) {
// TODO Auto-generated catch block
finish();
}
return null;
}
#Override
protected void onPostExecute(Void res) {
listViewGameResults.setAdapter(adapter);
listViewGameResults.setDivider(null);
listViewGameResults.setDividerHeight(0);
ProgressBar pb = (ProgressBar)findViewById(R.id.progressbar_loading);
pb.setVisibility(View.GONE);
}
}
ProgressBar and ListView in my layout:
<ProgressBar
style="?android:attr/progressBarStyle"
android:layout_centerInParent="true"
android:id="#+id/progressbar_loading"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ListView
android:id="#+id/listViewGameResults"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="1dip"
android:layout_below="#+id/upperstrip"
android:layout_above="#+id/ivDownStrip" />

Answer 1

You need to set default visibility of progressBar gone.and onPreExecute()set Visible and onPostExecute()set gone.
<ProgressBar
style="?android:attr/progressBarStyle"
android:layout_centerInParent="true"
android:id="#+id/progressbar_loading"
android:visibility="gone"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<ListView
android:id="#+id/listViewGameResults"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="1dip"
android:layout_below="#+id/upperstrip"
android:layout_above="#+id/ivDownStrip" />
your Activity should look like this
public class demo extends Activity{
private ListView listViewGameResults;
protected View dialogLayout;
protected ArrayList<Game> listGames;
progressBar progress;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.adresults);
progress=(ProgressBar)findViewByid(R.id.progressbar_loading);
GameResultsLoader gameResultsLoader = new GameResultsLoader(this);
gameResultsLoader.execute();
}
}
Use one separate class for AsyncTask
public class GameResultsLoader extends AsyncTask<Void, Void, Void> {
private GameResultsAdapter adapter;
Demo demo;
public GameResultsLoader(Demo demo) {
this.demo=demo;
}
#Override
protected void onPreExecute() {
demo.progress.setvisibility(View.Visible);
}
#Override
protected Void doInBackground(Void... params) {
try {
listGames = GameResultsCache.getInstance().getGameResults();
adapter = new GameResultsAdapter(getBaseContext(), listGames);
listViewGameResults = (ListView)findViewById(R.id.listViewGameResults);
}
catch (Exception e) {
// TODO Auto-generated catch block
finish();
}
return null;
}
#Override
protected void onPostExecute(Void res) {
listViewGameResults.setAdapter(adapter);
listViewGameResults.setDivider(null);
listViewGameResults.setDividerHeight(0);
ProgressBar pb = (ProgressBar)findViewById(R.id.progressbar_loading);
demo.progress.setVisibility(View.GONE);
}
}

Answer 2

if your using asnkTask that is work on main Thread so application is much more load.so better solution is using Service.class.
downlaod this example Check this link all are solution are there and download it:
you have to also get list from relaunch this application.
https://github.com/PankajSavaliyaGit/Upload-List

Answer 3

you have to write code to start progressDialog in preExecute method and at the postExecute dismiss it.
#Override
protected void onPreExecute() {
proDialog = new ProgressDialog(context);
proDialog.setTitle("App name");
proDialog.setMessage("Loding...");
proDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
//proDialog.setIcon(R.drawable.)
proDialog.setCancelable(true);
proDialog.show();
}
#Override
protected void onPostExecute(Void res) {
proDialog.dismiss();
}

Answer 4

The first thing you can do is put Progress bar code after OnCreate method. But the best thing is to create a simple method for Progress bar and only call it in OnCreate method.
The following code worked fine for me:
private void showDialog() {
progressDialog = new ProgressDialog(this);
progressDialog.setTitle("Have a nice time");
progressDialog.setMessage("Please wait while showing Titles :) ");
progressDialog.setCancelable(true);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.show();
}
And then call this method in OnCreate
showDialog();
You can stop Progress when the data is ready to view using:
progressDialog.dismiss();
I hope this is helpful.