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PORefreshing checkbox state in a listview
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  1. PORefreshing checkbox state in a listview
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    copied!<p>I have list view with custom row layout (list_row.xml) that contains CheckBox element:</p> <pre><code>&lt;TableLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="wrap_content" android:layout_width="fill_parent" android:orientation="horizontal" android:weightSum="1.0"&gt; &lt;TableRow&gt; &lt;TextView android:id="@+id/name" android:layout_weight=".85" android:layout_width="0dip" android:layout_height="wrap_content" android:text="sample" android:textSize="24sp"&gt; &lt;/TextView&gt; &lt;CheckBox android:id="@+id/enabled" android:layout_weight=".15" android:layout_width="0dip" android:layout_height="wrap_content" android:focusable="false"&gt; &lt;/CheckBox&gt; &lt;/TableRow&gt; &lt;/TableLayout&gt; </code></pre> <p>In my list activity I've got ListRowAdapter:</p> <pre><code>private static class ListRowAdapter extends ArrayAdapter&lt;ListRow&gt; implements CompoundButton.OnCheckedChangeListener { private List&lt;ListRow&gt; items; private LayoutInflater vi; private SparseBooleanArray mCheckStates; public ListRowAdapter(Context context, int textViewResourceId, List&lt;ListRow&gt; objects) { super(context, textViewResourceId, objects); this.items = objects; this.vi = LayoutInflater.from(context); this.mCheckStates = new SparseBooleanArray(objects.size()); for(int i=0;i&lt;mCheckStates.size();i++){ mCheckStates.put(i,items.get(i).isEnabled()); } Log.i("VIEW", "constructor"); } public boolean isChecked(int position) { return mCheckStates.get(position, false); } public void setChecked(int position, boolean isChecked) { mCheckStates.put(position, isChecked); items.get(position).setEnabled(isChecked); notifyDataSetChanged(); } public void toggle(int position) { setChecked(position, !isChecked(position)); } public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { ListRow r = (ListRow) buttonView.getTag(); r.setEnabled(isChecked); mCheckStates.put(items.indexOf(r), isChecked); Toast.makeText(getContext(), "row " + r.getName() + " changed to "+isChecked, Toast.LENGTH_SHORT).show(); } @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { Log.i("VIEW", "init holder"); convertView = vi.inflate(R.layout.list_row, null); holder = new ViewHolder(); holder.name = (TextView) convertView.findViewById(R.id.name); holder.enabled = (CheckBox) convertView .findViewById(R.id.enabled); convertView.setTag(holder); } else { Log.i("VIEW", "using holder"); holder = (ViewHolder) convertView.getTag(); } ListRow row = items.get(position); if (row != null) { holder.name.setText(row.getName()); holder.enabled.setTag(row); holder.enabled.setChecked(mCheckStates.get(position, false)); holder.enabled.setOnCheckedChangeListener(this); } return convertView; } static class ViewHolder { TextView name; CheckBox enabled; } } </code></pre> <p>In my Activity (that extends ListActivity) I do the following:</p> <pre><code>private static List&lt;ListRow&gt; rows; private ListRowAdapter lra; </code></pre> <p>... and then</p> <pre><code>getListView().setItemsCanFocus(false); getListView().setTextFilterEnabled(true); rows = initRows(); lra = new ListRowAdapter(this, R.layout.list_row, rows); setListAdapter(lra); </code></pre> <p>and that works fine while scrolling. But if I don't use <code>mCheckStates</code> array it fails! I just can't understand why. I have items array as a member of my Activity class and it contains all the states of checkboxes! I update it in <code>onCheckedChanged()</code> method like I update <code>mCheckState</code>. So the following code has to work:</p> <pre><code>public boolean isChecked(int position) { return items.get(position).isEnebled(); } public void setChecked(int position, boolean isChecked) { items.get(position).setEnabled(isChecked); notifyDataSetChanged(); } public void toggle(int position) { setChecked(position, !isChecked(position)); } public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { ListRow r = (ListRow) buttonView.getTag(); r.setEnabled(isChecked); Toast.makeText(getContext(), "row " + r.getName() + " changed to "+isChecked, Toast.LENGTH_SHORT).show(); } </code></pre> <p>and in <code>getView()</code> method:</p> <pre><code>holder.enabled.setTag(row);holder.enabled.setChecked(row.isEnabled()); </code></pre> <p>But it doesn't. It loses checkbox states while scrolling and I don't know why.</p>
 

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