Solved

Android Custome ListView with checkbox OnCheckedChangeListener

Posted on 2011-09-21
3
1,564 Views
Last Modified: 2012-05-12
The setting op of my click listener for each checkbox in my custom list items is causing the application to crash.

Below is a copy of the code section that I have made to got through and load up each listViewItem.
//SET UP MAIN LIST
        lv1 = (ListView)findViewById(R.id.mainList);
        double listTotal = 0;
        
       if(!itemList.isEmpty())
        {
    	   //Toast.makeText(this, "Entered Setup Main loop", Toast.LENGTH_SHORT).show();
    	   
        	ArrayList<HashMap<String, String>> mylist = 
		        	new ArrayList<HashMap<String,String>>();
        	 
        	for (int i = 0; i <= itemList.size()-1; i++)
        	{       			        
		        HashMap<String, String> map = new HashMap<String, String>();
		        map.put("id", Integer.toString(itemList.get(i).getItem_id()));
		        map.put("top", itemList.get(i).getName());
		        map.put("bottom", String.valueOf(itemList.get(i).getPrice()));
		        mylist.add(map);
		        listTotal = listTotal + itemList.get(i).getPrice();
		        
		        final String name = itemList.get(i).getName();
		        
		        CheckBox needItem = (CheckBox)lv1.findViewById(R.id.listneeded);      
		        needItem.setOnCheckedChangeListener(new OnCheckedChangeListener()
		        {
					@Override
					public void onCheckedChanged(CompoundButton buttonView,
							boolean isChecked) {
						//createToast("Item: " + name);
					}
		        });
        	}
        	
	        SimpleAdapter lItems = new SimpleAdapter(this,mylist,R.layout.listitemlayout,
	        		new String[]{"id", "top", "bottom"}, new int[]{R.id.itemid, R.id.topText, R.id.bottomText});
	        
	        lv1.setAdapter(lItems);
	        
        }

Open in new window

0
Comment
Question by:russellC
  • 2
3 Comments
 
LVL 24

Expert Comment

by:alexey_gusev
ID: 36581309
I bet that

lv1.findViewById(R.id.listneeded)

Open in new window


returns null. You should do your setter in getView() of the adapter
0
 
LVL 3

Author Comment

by:russellC
ID: 36593782
Sorry for the delayed responce.  

Your right my lv1.findViewById(R.id.listneeded) is returning null. I think I may be going about settign up this listView wrong.  

Is there a better example that shows how to set the eventListeners for the custome listView items?
0
 
LVL 24

Accepted Solution

by:
alexey_gusev earned 500 total points
ID: 36597148
no, your listview is OK, but its items (ie individual lines) are defined in getView() method of the adapter. Android asks your adapter to build a view for given index - and that's where you create your custom lines, so you can setup it there.

have a look at this video - http://www.google.com/intl/it-IT/events/io/2010/sessions/world-of-listview-android.html - that's the guy behind many Android features :)
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
Introduction This article is the second of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers the basic installation and configuration of the test automation tools used by…
Viewers learn about the “for” loop and how it works in Java. By comparing it to the while loop learned before, viewers can make the transition easily. You will learn about the formatting of the for loop as we write a program that prints even numbers…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question