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POandroid : checkboxes in a ListView ( strange behaviour of selected element)
 

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  1. POandroid : checkboxes in a ListView ( strange behaviour of selected element)
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    <p>I found <a href="https://stackoverflow.com/questions/3606530/listview-scroll-to-the-end-of-the-list-after-updating-the-list">here</a> and <a href="https://stackoverflow.com/questions/5444355/android-listview-with-checkbox-problem">here</a> similar issues, but the problem is slightly different.</p> <p>In a ListView, I try to put an adapter (extends from base Adapter) which contents checkbox.</p> <p>List view layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" style="@style/mainLayout" &gt; &lt;Button android:id="@+id/close_cat" android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="buttonClick" android:text="@string/back" /&gt; &lt;ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>XML of list's elements:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;TableLayout android:id="@+id/blocCheck" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginBottom="25px" android:layout_marginTop="25px" android:background="@color/black" &gt; &lt;TableRow android:layout_width="fill_parent" android:layout_height="wrap_content" android:baselineAligned="true" android:paddingLeft="4sp" &gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_weight="1" android:orientation="horizontal" android:paddingLeft="20sp" &gt; &lt;ImageView android:id="@+id/iv_cat" android:layout_width="wrap_content" android:layout_height="wrap_content" /&gt; &lt;TextView android:id="@+id/category" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="left" android:layout_marginLeft="15dip" android:text="tfgldkjhglf" android:textSize="20sp" /&gt; &lt;/LinearLayout&gt; &lt;CheckBox android:id="@+id/check_cat" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="right" android:layout_marginRight="10sp" android:onClick="MyHandler" /&gt; &lt;/TableRow&gt; &lt;/TableLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>I set adapter in my view :</p> <pre><code>list = getListView(); list.setAdapter(new CatAdapter(this, listCat)); </code></pre> <p>My adapter:</p> <pre><code>public class CatAdapter extends BaseAdapter { private LayoutInflater mInflater; private List&lt;CatAdapterObject&gt; mListAppInfo; private Context mContext; /** * Constructor * @param context * @param data * @param resource * @param from * @param to */ public CatAdapter (Context context, List&lt;CatAdapterObject&gt; list){ mContext = context; mListAppInfo = list; mInflater = LayoutInflater.from(mContext); } /** * number of elements */ @Override public int getCount() { return mListAppInfo.size(); } /** * get an item in the list */ @Override public Object getItem (int position){ return mListAppInfo.get(position).getId(); } /** * get id of the selected item */ @Override public long getItemId(int position) { return mListAppInfo.get(position).getId(); } /** * get the view */ @Override public View getView (int position, View convertView, ViewGroup parent){ LinearLayout layoutItem; if (convertView == null) { layoutItem = (LinearLayout) mInflater.inflate(R.layout.category, parent, false); } else { layoutItem = (LinearLayout) convertView; } // get the current category CatAdapterObject entry = mListAppInfo.get(position); //view setting TextView category = (TextView) layoutItem.findViewById(R.id.category); CheckBox cb = (CheckBox) layoutItem.findViewById(R.id.check_cat); ImageView iv_cat = (ImageView) layoutItem.findViewById(R.id.iv_cat); //elements setting category.setText(entry.getName()); //checkbox cb.setChecked(entry.isChecked()); cb.setTag(position); //picture Bitmap icon = Utils.getResizedBitmap(BitmapFactory.decodeResource(mContext.getResources(),entry.getPict()),45,45,true); iv_cat.setImageBitmap(icon); return layoutItem; } } </code></pre> <p>When activity is lauched, list is displayed perfectly. I can scroll up/down without any problem. However, when I check one of the checkboxes and scroll down, box which was checked "loose" its check mark and the background color of the latest box in the list changed.</p> <p>When checking a box, below method is called (In my activity file):</p> <pre><code>public void MyHandler(View v) { //クリックされたcheckbox cb = (CheckBox) v; Log.d("CHECKBOX","before :"+Utils.implode(",",this.cat_id_list)); //get position in the list Integer position = Integer.parseInt(cb.getTag().toString()); //instance of the view (list's child) View o = list.getChildAt(position).findViewById(R.id.blocCheck); // check if box is checked if (cb.isChecked()) { o.setBackgroundResource(R.color.pink); this.cat_id_list.add(position.toString()); // 背景色を替え、リストから削除 } else { o.setBackgroundResource(R.color.black); Collections.sort(this.cat_id_list); int index = Collections.binarySearch(this.cat_id_list,position.toString()); this.cat_id_list.remove(index); } Log.d("CHECKBOX","after :"+Utils.implode(",",this.cat_id_list)); } </code></pre> <p>There are 8 elements in my list but when I check the "mChildrenCount" of the list, there are only 5 elements.</p> <p>I just want to save in the "this.cat_id_list" id of elements wich were checked and change background color of selected item.</p> <p>I would appreciate your help !</p>
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