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POChecking the checked item in list view
 

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    <p>hi i am trying to implement a long list in which user can check the items in list view.when he scroll the list item then i store the checked items in sparseboolean array but when i try to check the items on clicking a button that which items is checked. it shows strange behaviour.when i check first item and click button then it gave right result but when i start checking the items from bottom of list. then it shows strange behaviour.there are 14 items indexed from 0-13.when i check 13th element it shows no toast.when i click 12th element it shows no toast .when i click 12 th element it shows no toast first toast arise when i click on 8th element.please help me in figuring out where i am wrong and help me in fixing the bug.when i click on 7th element three toast come 7,8,9 when i click on 6th element 5toast arise 6,7,8,9,10.please help me in fixing this bug.i want to show the the number in toast which are selected. here is my code </p> <pre><code>/** * This example shows how to create a list of checkboxes. */ public class CheckboxActivity extends ListActivity implements AdapterView.OnItemClickListener { static SparseBooleanArray mCheckStates; private CheckBoxAdapter mCheckBoxAdapter; List&lt;Boolean&gt; check; Button btn; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mCheckBoxAdapter = new CheckBoxAdapter(this, R.layout.list_item_checkbox, GENRES); setListAdapter(mCheckBoxAdapter); check=new ArrayList&lt;Boolean&gt;(); final ListView listView = getListView(); listView.setItemsCanFocus(false); listView.setTextFilterEnabled(true); listView.setOnItemClickListener(this); btn=(Button)findViewById(R.id.btn); btn.setOnClickListener(new OnClickListener(){ @Override public void onClick(View arg0) { // TODO Auto-generated method stub for(int i=0;i&lt;mCheckStates.size()+1;i++) if(mCheckStates.get(i)==true) Toast.makeText(CheckboxActivity.this,i+" " ,Toast.LENGTH_SHORT).show(); } }); } public void onItemClick(AdapterView parent, View view, int position, long id) { mCheckBoxAdapter.toggle(position); } private static class CheckBoxAdapter extends ArrayAdapter&lt;String&gt; implements CompoundButton.OnCheckedChangeListener { public CheckBoxAdapter(Context context, int resource, String[] objects) { super(context, resource, objects); mCheckStates = new SparseBooleanArray(objects.length); } @Override public View getView(int position, View convertView, ViewGroup parent) { final CheckBox view = (CheckBox) super.getView(position, convertView, parent); view.setTag(position); view.setChecked(mCheckStates.get(position, false)); view.setOnCheckedChangeListener(this); return view; } public boolean isChecked(int position) { return mCheckStates.get(position, false); } public void setChecked(int position, boolean isChecked) { mCheckStates.put(position, isChecked); notifyDataSetChanged(); } public void toggle(int position) { setChecked(position, !isChecked(position)); } public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { mCheckStates.put((Integer) buttonView.getTag(), isChecked); } } private static final String[] GENRES = new String[] { "Action", "Adventure", "Animation", "Children", "Comedy", "Documentary", "Drama", "Foreign", "History", "Independent", "Romance", "Sci-Fi", "Television", "Thriller" }; } </code></pre>
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    1. USRitesh Mehandiratta
    1. USRitesh Mehandiratta
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    1. COHUH?! Please consider breaking down your paragraph into chunks. It is hard to understand that 5 line sentence which describes your flow of checking items.
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      1. USJack
    2. CO@Jack hi i think now i explain correctly my problem please help.
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      1. USRitesh Mehandiratta
    3. COdid you ever figure this out? I just noticed that in your for loop for btn onClickListener, you are going from i=1, to mCheckStates.size() + 1, which I think should just be mCheckStates.size()
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