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POListView Delete Button on Checkbox checked
 

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  1. POListView Delete Button on Checkbox checked
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    <p>I need the following flow to work out: Once I tap to check any of my listview items checkboxes, a Delete Button should appear. If I uncheck all checkboxes, the Delete Button should disappear. My problem is that once make a setOnCheckedChangeListener to make Delete visible/gone, on my CheckBox View, it will automatically uncheck itself, after I scroll the listview, and it is not visible any more on my screen (`cause of recycling the views).</p> <p>Any ideas on how to get a total_number_of_checkboxes_checked variable, that would increase or decrease with 1. (I repeat, counting all checkboxes checked, not only the visible on screen ones).</p> <p>EDIT: added code</p> <hr> <h2>Adapter</h2> <hr> <pre><code>public class AdminNotesAdapter extends BaseAdapter { private ArrayList&lt;AdminNoteShortenHolder&gt; mNotesList = new ArrayList&lt;AdminNoteShortenHolder&gt;(); private AdminNoteShortenHolder mNoteHolder = new AdminNoteShortenHolder(); private ViewHolder holder = null; private Activity activity; public AdminNotesAdapter(ArrayList&lt;AdminNoteShortenHolder&gt; array, Activity activity) { this.activity = activity; this.mNotesList = array; } @Override public int getCount() { return mNotesList.size(); } @Override public Object getItem(int position) { return null; } @Override public long getItemId(int position) { return 0; } @Override public View getView(int position, View convertView, ViewGroup parent) { mNoteHolder = mNotesList.get(position); if (convertView == null) { convertView = activity.getLayoutInflater().inflate( R.layout.row_adminnotes, null); holder = new ViewHolder(convertView); holder.cb_row_adminNotesCheck .setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { int getPosition = (Integer) buttonView.getTag(); mNotesList.get(getPosition).setSelected(isChecked); } }); convertView.setTag(holder); convertView.setTag(R.id.cb_row_adminnotesCheck, holder.cb_row_adminNotesCheck); } else { holder = (ViewHolder) convertView.getTag(); } holder.img_row_adminnotesNew .setVisibility(0 == mNoteHolder.note_read ? View.VISIBLE : View.GONE); holder.txt_row_adminnotesNoteSubject.setText(mNoteHolder.note_subject); holder.txt_row_adminnotesNoteUser.setText("from " + mNoteHolder.note_from_user + " | " + mNoteHolder.note_time); holder.txt_row_adminnotesNotePreview.setText(mNoteHolder.note_content); holder.cb_row_adminNotesCheck.setTag(position); holder.cb_row_adminNotesCheck.setChecked(mNotesList.get(position) .isSelected()); return convertView; } static class ViewHolder { public ImageView img_row_adminnotesNew; public TextView txt_row_adminnotesNoteSubject; public TextView txt_row_adminnotesNoteUser; public TextView txt_row_adminnotesNotePreview; public CheckBox cb_row_adminNotesCheck; public ViewHolder(View convertView) { img_row_adminnotesNew = (ImageView) convertView .findViewById(R.id.img_row_adminnotesNew); txt_row_adminnotesNoteSubject = (TextView) convertView .findViewById(R.id.txt_row_adminnotesNoteSubject); txt_row_adminnotesNoteUser = (TextView) convertView .findViewById(R.id.txt_row_adminnotesNoteUser); txt_row_adminnotesNotePreview = (TextView) convertView .findViewById(R.id.txt_row_adminnotesNotePreview); cb_row_adminNotesCheck = (CheckBox) convertView .findViewById(R.id.cb_row_adminnotesCheck); } } } </code></pre> <h2>AdminNoteShortenHolder (Model class)</h2> <pre><code>public class AdminNoteShortenHolder extends BaseHolder { public int note_id; public String note_from_user; public String note_subject; public String note_content; public String note_time; public int note_read; private boolean selected; @Override public void parse(JSONObject jsonObject) { note_id = jsonObject.optInt("note_id", -1); note_from_user = jsonObject.optString("note_from_user"); note_subject = jsonObject.optString("note_subject"); note_content = jsonObject.optString("note_content"); note_time = jsonObject.optString("note_time"); note_read = jsonObject.optInt("note_read", -1); } public boolean isSelected() { return selected; } public void setSelected(boolean selected) { this.selected = selected; } } </code></pre> <p>This is what I've done so far, so I managed to maintain the CheckBoxes status over the scrolling of the ListView with the help of setTag / getTag. Problem is, I have a Delete Button in my Activity that should be visible/gone whenever there is at least one Checkboxes checked or none.. Let me know if you have any ideas.</p>
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    1. USDoruAdryan
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    1. COthe view is not the place to store data because, as you said, they're being recycled. The checked status of a check box is data for your case. You must store that information in a http://developer.android.com/reference/android/util/SparseBooleanArray.html
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      1. USBudius
    2. COCould you please provide me an example on how to use that?
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      1. USDoruAdryan
    3. COjust make `boolean[] myCheckedStatus = new boolean[numberOfItems]` and on each click you invert the value on that position.
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      1. POListView Delete Button on Checkbox checked
      1. USBudius
 

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