StackOverflow2013

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PO
primarykey
Id
18915343
data
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0
AnswerCount
0
ClosedDate
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2013-09-20T11:12:17.760
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2013-09-20T11:22:31.447
LastEditDate
2017-05-23T12:29:54.867
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-1
OwnerUserId
2320413
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17952941
PostTypeId
2
Score
0
ViewCount
0
LastEditorDisplayName
text
Body
Having trouble with similar task. ExpandableListview placed in Fragment with custom group/item views. My solution is use SharedPreferences based on <a href="https://stackoverflow.com/a/4186345/2320413">this answer</a>. It's may be not optimal (I learn Java/Android less than a month) but only one that worked. Storing/restoring via Bundle does not work for me :( <ol> <li>Write 2 methods for collecting and setting expanded states: <pre><code>private ArrayList<Long> getExpandedIds() { // private ExpandableListView lv defined above BaseExpandableListAdapter adp = (BaseExpandableList) lv.getExpandableListAdapter(); if (adp != null) { int sz = adp.getGroupCount(); ArrayList<Long> ids = new ArrayList<Long>(); for (int i=0; i<sz; i++) if lv.isGroupExpanded(i)) ids.add(adp.getGroupId(i)); return ids; } else { return null; } } private void setExpandedIds(ArrayList<Long> ids) { if ((ids == null) || (ids.size()==0)) return; BaseExpandableListAdapter adp = (BaseExpandableListAdapter) lv.getExpandableListAdapter(); if (adp != null) { int sz = adp.getGroupCount(); for (int i=0;i<sz;i++) { long id = adp.getGroupId(i); for (long n : ids) { if (n == id) { lv.expandGroup(i); break; } } } } } </code></pre></li> <li>Use above methods for save and restore state in SharedPreferences: <pre><code>@Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); ArrayList<Long> expIds = getExpandedIds(); if (expIds != null) { try { @SuppressWarnings("ConstantConditions") SharedPreferences pref = this.getActivity().getPreferences(Activity.MODE_PRIVATE); SharedPreferences.Editor ed = pref.edit(); String s = TextUtils.join(";", expIds.toArray()); ed.putString(LV_NAME, s); ed.commit(); } catch (NullPointerException e) { Log.e("YAMK", "Store prefs failed."); } } } // in onCreateView: try { @SuppressWarnings("ConstantConditions") SharedPreferences pref = getActivity().getPreferences(Activity.MODE_PRIVATE); ArrayList<Long>expIds = new ArrayList<Long>(); for (String s : TextUtils.split(pref.getString(LV_NAME, ""), ";")) { expIds.add(Long.parseLong(s)); } } catch (NullPointerException e) { // } setExpandedIds(expIds); </code></pre></li> </ol>
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1. This table or related slice is empty.
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1. POExpandableListView groups stuck collapsed after rotating
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1. PTAnswer
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1. USCommunity
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1. USA.V
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