Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here's an implementation I just whipped up. I have no idea if it works or not, but seems "smart" to me :) By the way, how should one go about getting the combined child id or the combined group id, so I just kinda improvised there. </p> <pre><code>package example; import java.util.ArrayList; import java.util.List; import java.util.Map.Entry; import android.content.Context; import android.database.DataSetObservable; import android.database.DataSetObserver; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ExpandableListAdapter; public abstract class AbstractExpandableListAdapter&lt;A, B&gt; implements ExpandableListAdapter { private final List&lt;Entry&lt;A, List&lt;B&gt;&gt;&gt; objects; private final DataSetObservable dataSetObservable = new DataSetObservable(); private final Context context; private final Integer groupClosedView; private final Integer groupExpandedView; private final Integer childView; private final LayoutInflater inflater; public AbstractExpandableListAdapter(Context context, int groupClosedView, int groupExpandedView, int childView, List&lt;Entry&lt;A, List&lt;B&gt;&gt;&gt; objects) { this.context = context; this.objects = objects; this.groupClosedView = new Integer(groupClosedView); this.groupExpandedView = new Integer(groupExpandedView); this.childView = new Integer(childView); this.inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } public void add(Entry&lt;A, List&lt;B&gt;&gt; group) { this.getObjects().add(group); this.notifyDataSetChanged(); } public void remove(A group) { for (Entry&lt;A, List&lt;B&gt;&gt; entry : this.getObjects()) { if (entry != null &amp;&amp; entry.getKey().equals(group)) { this.getObjects().remove(group); this.notifyDataSetChanged(); break; } } } public void remove(Entry&lt;A, List&lt;B&gt;&gt; entry) { remove(entry.getKey()); } public void addChild(A group, B child) { for (Entry&lt;A, List&lt;B&gt;&gt; entry : this.getObjects()) { if (entry != null &amp;&amp; entry.getKey().equals(group)) { if (entry.getValue() == null) entry.setValue(new ArrayList&lt;B&gt;()); entry.getValue().add(child); this.notifyDataSetChanged(); break; } } } public void removeChild(A group, B child) { for (Entry&lt;A, List&lt;B&gt;&gt; entry : this.getObjects()) { if (entry != null &amp;&amp; entry.getKey().equals(group)) { if (entry.getValue() == null) return; entry.getValue().remove(child); this.notifyDataSetChanged(); break; } } } public void notifyDataSetChanged() { this.getDataSetObservable().notifyChanged(); } public void notifyDataSetInvalidated() { this.getDataSetObservable().notifyInvalidated(); } public void registerDataSetObserver(DataSetObserver observer) { this.getDataSetObservable().registerObserver(observer); } public void unregisterDataSetObserver(DataSetObserver observer) { this.getDataSetObservable().unregisterObserver(observer); } public int getGroupCount() { return getObjects().size(); } public int getChildrenCount(int groupPosition) { return getObjects().get(groupPosition).getValue().size(); } public Object getGroup(int groupPosition) { return getObjects().get(groupPosition).getKey(); } public Object getChild(int groupPosition, int childPosition) { return getObjects().get(groupPosition).getValue().get(childPosition); } public long getGroupId(int groupPosition) { return ((Integer)groupPosition).longValue(); } public long getChildId(int groupPosition, int childPosition) { return ((Integer)childPosition).longValue(); } public boolean hasStableIds() { return true; } public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { if (convertView != null &amp;&amp; convertView.getId() != (isExpanded ? getGroupExpandedView() : getGroupClosedView())) { // do nothing, we're good to go, nothing has changed. } else { // something has changed, update. convertView = inflater.inflate(isExpanded ? getGroupExpandedView() : getGroupClosedView(), parent, false); convertView.setTag(getObjects().get(groupPosition)); } return convertView; } public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { if (convertView != null) { // do nothing } else { // create convertView = inflater.inflate(getChildView(), parent, false); convertView.setTag(getObjects().get(groupPosition).getValue().get(childPosition)); } return convertView; } public boolean isChildSelectable(int groupPosition, int childPosition) { return true; } public boolean areAllItemsEnabled() { return true; } public boolean isEmpty() { return getObjects().size() == 0; } public void onGroupExpanded(int groupPosition) { } public void onGroupCollapsed(int groupPosition) { } public long getCombinedChildId(long groupId, long childId) { return groupId * 10000L + childId; } public long getCombinedGroupId(long groupId) { return groupId * 10000L; } protected DataSetObservable getDataSetObservable() { return dataSetObservable; } protected List&lt;Entry&lt;A, List&lt;B&gt;&gt;&gt; getObjects() { return objects; } protected Context getContext() { return context; } protected Integer getGroupClosedView() { return groupClosedView; } protected Integer getGroupExpandedView() { return groupExpandedView; } protected Integer getChildView() { return childView; } } </code></pre> <p>Any comments or criticisms are welcome.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to write custom ExpandableListAdapter
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USNaftuli Kay
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow to write custom ExpandableListAdapter
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COBy the way, just tested this and it seems to work great. :)
      singulars
      1. PO
      1. USNaftuli Kay
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload