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POBaseExpandableListAdapter using two cursors from sqlite db
 

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  1. POBaseExpandableListAdapter using two cursors from sqlite db
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    <p>I'm trying to write a BaseExpandableListViewAdapter for my app. The main problem is that it works, but completely wrong and i can't locate what is wrong.</p> <p>The source for it are two tables in sqlite database: groups and code:</p> <pre><code>CREATE TABLE codes (_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, name TEXT COLLATE NOCASE NOT NULL, code TEXT NOT NULL, groupId INTEGER NOT NULL,confirmation INTEGER NOT NULL, FOREIGN KEY(groupId) REFERENCES groups(_id), CHECK(confirmation=1 OR confirmation=0)); CREATE TABLE groups (_id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, name TEXT COLLATE NOCASE NOT NULL, icon TEXT NOT NULL, sequence INTEGER NOT NULL); </code></pre> <p>So i thought that i should provide Cursor containing groups (the ones that have at least one code assigned to them) and an ArrayList containing cursors with codes belonging to a group. The thing is as i said before that the adapter doesn't work as expected (technically not at all).</p> <p>Here is the code of my adapter:</p> <pre><code>public class MainExpandableListAdapter extends BaseExpandableListAdapter { public static class ImageTextViewHolder { ImageView img; TextView text1; } public static class TextViewHolder { TextView text1; TextView text2; } private Context context; private ArrayList&lt;Cursor&gt; childs; private Cursor groups; private LayoutInflater inflater; private String packageName; private final String drawablesPath = "drawable"; public MainExpandableListAdapter(Context context, ArrayList&lt;Cursor&gt; childs, Cursor groups) { super(); this.context = context; this.childs = childs; this.groups = groups; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); packageName = context.getPackageName(); } public Object getChild(int groupPosition, int childPosition) { return null; } public long getChildId(int groupPosition, int childPosition) { Cursor temp = childs.get(groupPosition); temp.moveToPosition(childPosition); return temp.getLong(temp.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_ID)); } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextViewHolder vh; if (convertView == null) { vh = new TextViewHolder(); convertView = inflater.inflate(R.layout.child_view, null); vh.text1 = (TextView) convertView.findViewById(R.id.childview_row_title); vh.text2 = (TextView) convertView.findViewById(R.id.childview_row_code); convertView.setTag(vh); } else { vh = (TextViewHolder) convertView.getTag(); } Cursor temp = childs.get(groupPosition); vh.text1.setText(temp.getString(temp.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_NAME))); vh.text2.setText(temp.getString(temp.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_CODE))); return convertView; } public int getChildrenCount(int groupPosition) { Cursor temp = childs.get(groupPosition); return temp.getCount(); } public Object getGroup(int groupPosition) { return null; } public int getGroupCount() { return groups.getCount(); } public long getGroupId(int groupPosition) { groups.moveToPosition(groupPosition); return groups.getLong(groups.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_ID)); } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { ImageTextViewHolder vh; if (convertView == null) { vh = new ImageTextViewHolder(); convertView = inflater.inflate(R.layout.group_view, null); vh.img = (ImageView) convertView.findViewById(R.id.groupview_row_imageview); vh.text1 = (TextView) convertView.findViewById(R.id.groupview_row_text); convertView.setTag(vh); } else { vh = (ImageTextViewHolder) convertView.getTag(); } groups.moveToPosition(groupPosition); vh.img.setImageResource(context.getResources().getIdentifier( packageName + ":" + drawablesPath + "/" + groups.getString(groups.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_ICON)), null, null)); vh.text1.setText(groups.getString(groups.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_NAME))); return convertView; } public boolean hasStableIds() { return true; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } } </code></pre> <p>And here is how I provide data for it from a class that extends ExpandableListViewActivity:</p> <pre><code>private void populateExpandableList() { SharedPreferences sp = getSharedPreferences(PREFS_NAME, 0); sortOrder = sp.getString(CODES_SORT_ORDER, ALPHABETICALY); Cursor usedGroupsCursor = managedQuery(UssdCodesProvider.codesUri, new String[]{"distinct(" + UssdCodesProvider.UssdDbHelper.COLUMN_GROUPID + ")"}, null, null, null); if (usedGroupsCursor.moveToFirst() == true) { String[] usedGroups = new String[usedGroupsCursor.getCount()]; int i = 0; do { usedGroups[i] = String.valueOf(usedGroupsCursor.getInt(0)); i++; } while (usedGroupsCursor.moveToNext()); String whereClause = UssdCodesProvider.UssdDbHelper.COLUMN_ID + " in ( ?"; if (usedGroups.length &gt; 1) for (i = 1; i &lt; usedGroups.length; i++) whereClause += ", ?"; whereClause += ")"; Cursor groups = managedQuery(UssdCodesProvider.groupsUri, null, whereClause, usedGroups, UssdCodesProvider.UssdDbHelper.COLUMN_SEQUENCE); if (groups.moveToFirst()) do { Log.d("groups",groups.getString(groups.getColumnIndexOrThrow("_id"))+" "+groups.getString(groups.getColumnIndexOrThrow("name"))); } while (groups.moveToNext()); ArrayList&lt;Cursor&gt; codesArrayList = new ArrayList&lt;Cursor&gt;(); for (i = 0; i &lt; usedGroups.length; i++) { Cursor codes = managedQuery(UssdCodesProvider.codesUri, null, UssdCodesProvider.UssdDbHelper.COLUMN_GROUPID + "='" + Integer.valueOf(usedGroups[i]) +"'", null, sortOrder); if (codes.moveToFirst()) do { Log.d(String.valueOf(i), codes.getString(groups.getColumnIndexOrThrow("_id"))+" "+codes.getString(groups.getColumnIndexOrThrow("name"))); } while (codes.moveToNext()); codesArrayList.add(codes); } MainExpandableListAdapter adapter = new MainExpandableListAdapter(this, codesArrayList, groups); setListAdapter(adapter); } </code></pre> <p><strong>EDIT</strong></p> <p>Of course: when i start the app and there are some groups here is what the list looks like <a href="http://i55.tinypic.com/2505jyt.png" rel="nofollow">link</a> and after clicking a group it throws error in getChildView:</p> <pre><code>public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { TextViewHolder vh; if (convertView == null) { vh = new TextViewHolder(); convertView = inflater.inflate(R.layout.child_view, null); vh.text1 = (TextView) convertView.findViewById(R.id.childview_row_title); vh.text2 = (TextView) convertView.findViewById(R.id.childview_row_code); convertView.setTag(vh); } else { vh = (TextViewHolder) convertView.getTag(); } Cursor temp = childs.get(groupPosition); /*THIS LINE */ vh.text1.setText(temp.getString(temp.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_NAME))); vh.text2.setText(temp.getString(temp.getColumnIndexOrThrow(UssdCodesProvider.UssdDbHelper.COLUMN_CODE))); return convertView; </code></pre> <p>}</p>
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    1. USBartoszCichecki
    1. USBartoszCichecki
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      1. POBaseExpandableListAdapter using two cursors from sqlite db
      1. USihrupin
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    1. COcan you explain how its not working.
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      1. USsuperfell
    2. COOf course. Added to post.
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    3. CODid your manage to get it working in the end?
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