Android Open Source - ExpertAndroid User List Activity

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License

The source code is released under:
MIT License
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Java Source Code

package com.androidbook.parse;
/*  w ww  . j  a  v  a  2s  .c  om*/
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.parse.FindCallback;
import com.parse.ParseException;
import com.parse.ParseObject;
import com.parse.ParseQuery;
import com.parse.ParseUser;

public class UserListActivity 
extends ListActivity
{
    @Override     
    protected void onCreate(Bundle savedInstanceState)
    {         
      super.onCreate(savedInstanceState);
      //this.setListAdapter(getAdapter());
      setInitialView(getListView());
      this.populateUserNameList();
    }
    private void setInitialView(ListView lv)
    {
      View beginView = this.getEmptyBeginView();
      beginView.setVisibility(View.GONE);
        ((ViewGroup)(lv.getParent())).addView(beginView);
        lv.setEmptyView(beginView);      
    }
    private void setErrorView(String errorMessage)
    {
      TextView emptyView = 
        (TextView)findViewById(R.id.EmptyWordListTextViewId);
      emptyView.setText(errorMessage);
    }
    private ListAdapter getAdapter()
    {
        String[] listItems = new String[] {
              "Item 1", "Item 2", "Item 3",
              "Item 4", "Item 5", "Item 6",
        };
        
        ArrayAdapter<String> listItemAdapter = 
           new ArrayAdapter<String>(this
                   ,android.R.layout.simple_list_item_1
                   ,listItems);
        return listItemAdapter;
    }
    private void populateUserNameList()
    {
      ParseQuery query = ParseUser.getQuery();
      this.turnOnProgressDialog("Going to get users", "Patience. Be Right back");
      query.findInBackground(new FindCallback() {
        public void done(List<ParseObject> objects, ParseException e) {
        turnOffProgressDialog();
          if (e == null) {
              // The query was successful.
            successfulQuery(objects);
          } else {
              // Something went wrong.
            queryFailure(e);
          }
        }
      });      
    }
    private void successfulQuery(List<ParseObject> objects)
    {
      ArrayList<ParseUserWrapper> userList = new ArrayList<ParseUserWrapper>();
      for(ParseObject po: objects)
      {
        ParseUser pu = (ParseUser)po;
        ParseUserWrapper puw = new ParseUserWrapper(pu);
        userList.add(puw);
      }
      
      ArrayAdapter<ParseUserWrapper> listItemAdapter = 
       new ArrayAdapter<ParseUserWrapper>(this
               ,android.R.layout.simple_list_item_1
               ,userList);
      this.setListAdapter(listItemAdapter);
    }
    private void queryFailure(ParseException x)
    {
      this.setErrorView(x.getMessage());
    }
    
    private View getEmptyBeginView()
    {
       LayoutInflater lif = LayoutInflater.from(this);
       View v = lif.inflate(R.layout.list_empty_begin_layout, null);
       return v;
    }    
  //Utility functions
    private ProgressDialog pd;
  public void turnOnProgressDialog(String title, String message)
  {
    pd = ProgressDialog.show(this,title,message);
  }
  public void turnOffProgressDialog()
  {
    pd.cancel();
  }
    
}//eof-class

class ParseUserWrapper
{
  private ParseUser pu = null;
  public ParseUserWrapper(ParseUser p)
  {
    pu = p;
  }
  @Override
  public String toString()
  {
    String username = pu.getUsername();
    String email = pu.getEmail();
    return username + "(" + email + ")";
  }
}
Java Source Code List
