ProgressBar when loading a ListView (using AsyncTask)

Question

I try to show a progress bar when loading a custom ListView, and then hide it. I am using the ASync task, but for some reason - the content view is not installed, and the previous layout view gets stuck until all the contents of the list are 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 the default visibility 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 you use asnkTask, which works in the main thread, so the application is much more load.so the best solution uses Service.class. downlaod this example Check this link, everyone has a solution, and download it: you should also get a list from renewing this application. https://github.com/PankajSavaliyaGit/Upload-List

Answer 3

you need to write code to run progressDialog in the preExecute method and release it in postExecute.

 @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(); }