android - マルチレベルの ExpandableListView の展開に関する問題

Question

ExpandableListView である子を含む複数レベル (3 レベル、ルート -> 親 -> 子) の ExpandableListView があります。それらを埋めるのに問題はありません。ただし、最初にアクティビティ (onCreate) を表示するときに、親レベルで特定のアイテムを展開する必要があります。

親の関連するルート項目を正常に展開しましたが、親項目を展開できないようです。指定されたリスナーが呼び出されますが、結果はマルチレベルリストに反映されません。

私が拡張と呼ぶ活動：

public class Activity {
    private int groupToExpand = 4, childToExpand = 3;
    protected void onCreate(Bundle savedInstance) {
        final ExpandableListView elv = (ExpandableListView) findViewById(R.id.elv);
        if (arrayList!= null && !arrayList.isEmpty()) {
            elv.setAdapter(new RootAdapter(this, arrayList);
            // this selects the correct group, but doesn't expand the child.
            elv.setSelectedChild(groupToExpand, childToExpand, true); 
            elv.expandGroup(groupToExpand); // this works.
        }
    }
}

私のルートアダプター:

public class RootAdapter extends BaseExpandableListAdapter {

private List<Objects> arrayList;
private Context context;
private LayoutInflater inflater;

public RootAdapter(Context context, List<Objects> arrayList) {
    this.context = context;
    this.arrayList = arrayList;
    this.inflater = LayoutInflater.from(context);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    final Objects parent = (Objects) getGroup(groupPosition);
    return parent.arrayList.get(childPosition);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
    final Objects o = (Objects) getChild(groupPosition, childPosition);

    CustomExpandableListView elv = (CustomExpandableListView) convertView;
    ChildViewHolder holder;

    if (elv == null) {
        holder = new ChildViewHolder();

        elv = new CustomExpandableListView(context);
        elv.setGroupIndicator(null);
        elv.setDivider(null);
        elv.setCacheColorHint(Color.parseColor("#00000000"));
        elv.setChildDivider(null);
        elv.setChildIndicator(null);
        elv.setScrollingCacheEnabled(false);
        elv.setAnimationCacheEnabled(false);

        holder.cListView = elv;
        elv.setTag(holder);
    } else {
        holder = (ChildViewHolder) elv.getTag();
    }

    final ParentAdapter adapter = new ParentAdapter(context, o);
    holder.cListView.setAdapter(adapter);

    return elv;
}

private static class ChildViewHolder {
    CustomExpandableListView cListView;
}

@Override
public int getChildrenCount(int groupPosition) {
    final Objects parent = (Objects) getGroup(groupPosition);
    return parent.arrayList.size();
}

@Override
public Object getGroup(int groupPosition) {
    return arrayList.get(groupPosition);
}

@Override
public int getGroupCount() {
    return arrayList.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    View layout = convertView;
    GroupViewHolder holder;
    final Objects o = (Objects) getGroup(groupPosition);

    if (layout == null) {
        layout = inflater.inflate(R.layout.item_to_inflate, parent, false);
        holder = new GroupViewHolder();

        holder.title = (TextView) layout.findViewById(R.id.title);
        holder.image = (ImageView) layout.findViewById(R.id.image);
        layout.setTag(holder);
    } else {
        holder = (GroupViewHolder) layout.getTag();
    }

    holder.title.setText(o.title.trim());

    return layout;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

private static class GroupViewHolder {
    TextView title;
    ImageView image;
}

public class CustomExpandableListView extends ExpandableListView {

    public CustomExpandableListView(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        heightMeasureSpec = MeasureSpec.makeMeasureSpec(2000, MeasureSpec.AT_MOST);
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

}

}

最後に私の ParentAdapter :

public class ParentAdapter extends BaseExpandableListAdapter {

private Objects child;
private LayoutInflater inflater;

public ParentAdapter(Context context, Objects child) {
    this.child = child;
    this.inflater = LayoutInflater.from(context);
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    return child.arrayList.get(childPosition);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
    View layout = convertView;
    final Objects o = (Objects) getChild(0, childPosition);

    ChildViewHolder holder;

    if (layout == null) {
        layout = inflater.inflate(R.layout.item_to_inflate, parent, false);

        holder = new ChildViewHolder();
        holder.title = (TextView) layout.findViewById(R.id.title);
        layout.setTag(holder);
    } else {
        holder = (ChildViewHolder) layout.getTag();
    }

    holder.title.setText(o.title.trim());

    return layout;
}

@Override
public int getChildrenCount(int groupPosition) {
    return child.arrayList.size();
}

@Override
public Object getGroup(int groupPosition) {
    return child;
}

@Override
public int getGroupCount() {
    return 1;
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    View layout = convertView;
    GroupViewHolder holder;

    if (layout == null) {
        layout = inflater.inflate(R.layout.item_to_inflate, parent, false);
        holder = new GroupViewHolder();

        holder.image = (ImageView) layout.findViewById(R.id.image);
        holder.title = (TextView) layout.findViewById(R.id.title);
        layout.setTag(holder);  
    } else {
        holder = (GroupViewHolder) layout.getTag();
    }
    holder.title.setText(o.title.trim());

    return layout;
}

@Override
public boolean hasStableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}

private static class GroupViewHolder {
    TextView title;
    ImageView image;
}

private static class ChildViewHolder {
    TextView title;
}

}

ルートの ExpandableListView 内で子リストを展開できません。親レベルでアイテムを展開する正しい方法を知っていますか?

RootAdapter の getChildView で試しました:

if (groupToExpand == groupPosition && childToExpand == childPosition) {
    elv.expandGroup(childToExpand);
}

次に、アクティビティで変更しました：

if (arrayList!= null && !arrayList.isEmpty()) {
    RootAdapter adapter = new RootAdapter(this, arrayList);
    elv.setAdapter(adapter);
    // this selects the correct group, but doesn't expand the child.
    elv.setSelectedChild(groupToExpand, childToExpand, true); 
    elv.expandGroup(groupToExpand); // this works.

    adapter.groupToExpand = groupToExpand;
    adapter.childToExpand = childToExpand;
    adapter.notifyDataSetChanged();
}

これにより、親レベルのアイテムが展開されますが、親の重複アイテムが生成されます。これを正しく行うにはどうすればよいですか？これは正しい方法ですが、アダプターが壊れているため、重複したアイテムが生成されますか?

ここで欠けているものを見つけることができません...

score 1 · Accepted Answer

これは私が見つけて使用した最良の例です: http://androidcodesnips.blogspot.in/2011/09/three-level-expandable-list.html

その作業、私は私の必要に応じてそれを変更しました。

タグ: 3 レベルの展開可能なリストビュー、複数レベルのリストビュー

android - マルチレベルの ExpandableListView の展開に関する問題

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