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POAndroid ExpandableListView with Checkbox, Controlling checked state
 

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    <p>Friends,</p> <p>I am trying to write a application which use checkbox in ExpandableListView, I got a problem here which is maintaining checkbox state of the application, I got the example from <a href="http://mylifewithandroid.blogspot.com/2010/02/expandable-lists-and-check-boxes.html" rel="noreferrer">here</a> , my problem is maintaining checked state of the checkboxes, whenever I check one of the checkboxes and Expand the List, the checkboxes do not have the checked state where they supposed to have. I have try to maintain by adding ArrayList to store the position of the store and reload the position in getChildView() but still not achieve what I want to do. here is my code </p> <pre><code>public class ElistCBox extends ExpandableListActivity { private static final String LOG_TAG = "ElistCBox"; ArrayList&lt;String &gt; chkState = new ArrayList&lt;String&gt;(); static final String colors[] = {"grey","blue","yellow","red"}; static final String shades[][] ={ { "lightgrey","#D3D3D3","dimgray","#696969", "sgi &gt;gray 92","#EAEAEA"}, { "dodgerblue 2","#1C86EE","steelblue &gt;2","#5CACEE","powderblue","#B0E0E6"}, { "yellow 1","#FFFF00", "gold 1","#FFD700","darkgoldenrod 1"," #FFB90F" }, {"indianred 1","#FF6A6A", "firebrick 1","#FF3030", "maroon","#800000" } }; /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter( this, createGroupList(), R.layout.group_row, new String[] { "colorName" }, new int[] { R.id.childname }, createChildList(), R.layout.child_row, new String[] { "shadeName", "rgb" }, new int[] { R.id.childname, R.id.rgb } ) { @Override public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { final View v = super.getChildView(groupPosition, childPosition, isLastChild, convertView, parent); final CheckBox chkColor = (CheckBox)v.findViewById(R.id.check1); if(chkState.contains(groupPosition+","+childPosition)){ chkColor.setChecked(true); }else{ chkColor.setChecked(false); } chkColor.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Log.e("Checkbox Onclick Listener", Integer.toString(groupPosition) + " - " + Integer.toString(childPosition)); } }); chkColor.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { Log.e("Checkbox check change Listener", Integer.toString(groupPosition) + " - " + Integer.toString(childPosition)); if(chkColor.isChecked()){ chkState.add(groupPosition+","+childPosition); } else { chkState.remove(groupPosition+","+childPosition); } } }); return super.getChildView(groupPosition, childPosition, isLastChild, convertView, parent); } }; setListAdapter( expListAdapter ); } public void onContentChanged () { super.onContentChanged(); Log.e( LOG_TAG, "onContentChanged" ); } public boolean onChildClick( ExpandableListView parent, View v, int groupPosition, int childPosition, long id) { Log.e( LOG_TAG, "onChildClick: "+childPosition ); CheckBox cb = (CheckBox)v.findViewById( R.id.check1 ); if( cb != null ) cb.toggle(); return false; } public void onGroupExpand (int groupPosition) { Log.e( LOG_TAG,"onGroupExpand: "+groupPosition ); } private List createGroupList() { ArrayList result = new ArrayList(); for( int i = 0 ; i &lt; colors.length ; ++i ) { HashMap m = new HashMap(); m.put( "colorName",colors[i] ); result.add( m ); } return (List)result; } private List createChildList() { ArrayList result = new ArrayList(); for( int i = 0 ; i &lt; shades.length ; ++i ) { ArrayList secList = new ArrayList(); for( int n = 0 ; n &lt; shades[i].length; n += 2 ) { HashMap child = new HashMap(); child.put( "shadeName", shades[i][n] ); child.put( "rgb", shades[i][n+1] ); secList.add( child ); } result.add( secList ); } return result; } } </code></pre>
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