ListActivity with two List

In this exercise, the ListView of a ListActivity switch between two ArrayAdapter.



Note that notifyDataSetChanged() function of the new ArrayAdapter have to be called after setListAdapter(), to re-draw the List on screen.

package com.exercise.AndroidDualListActivity;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class AndroidDualListActivity extends ListActivity{
 
 String[] month = {
      "January", "February", "March", "April",
      "May", "June", "July", "August",
      "September", "October", "November", "December"
    };
 
 String[] DayOfWeek = new String[] {
   "Sunday", "Monday", "Tuesday", "Wednesday",
   "Thursday", "Friday", "Saturday"};
 
 ArrayAdapter<String> monthAdapter, weekOfDayAdapter;
 String strMonth, strDayOfWeek; 
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        monthAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, month);
        weekOfDayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, DayOfWeek);
        
        setListAdapter(monthAdapter);
    }

 @Override
 protected void onListItemClick(ListView l, View v, int position, long id) {
  // TODO Auto-generated method stub
  super.onListItemClick(l, v, position, id);
  
  if(getListAdapter() == monthAdapter){
   strMonth = (String)getListView().getItemAtPosition(position);
   setListAdapter(weekOfDayAdapter);
   weekOfDayAdapter.notifyDataSetChanged();
  }else{
   strDayOfWeek = (String)getListView().getItemAtPosition(position);
   Toast.makeText(getBaseContext(), strMonth + ":" + strDayOfWeek, Toast.LENGTH_LONG).show();
   setListAdapter(monthAdapter);
   monthAdapter.notifyDataSetChanged();
  }
 }
}

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