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我想以編程方式創建一個ExpandableListView,但到目前爲止,它保留空間,但空間是全黑!沒有顯示。 我在這裏有一些特殊要求:我如何以編程方式創建一個ExpandableListView?
- 我想在代碼上做所有事情,沒有XML。到目前爲止,我的整個UI具有零XML,我想保持這種方式
- 我想如果可能的話,從活動中獲得我的活動。我覺得傻更改類只是因爲ExpandableListView會喜歡的。如果其他控件還想要奇怪的活動特殊類呢?希望它可以有一個活動的ExpandableListView,對不對?
因此,這裏是我的代碼迄今適配器:
// -------------------------------------------
// DoubleStringArrayExpandableListAdapter
// -------------------------------------------
public class DoubleStringArrayExpandableListAdapter extends BaseExpandableListAdapter
{
public ArrayList<String> Parents = new ArrayList<String>();
public ArrayList<String> Children = new ArrayList<String>();
public Activity mContext;
public Object getChild(int groupPosition, int childPosition)
{
return Children.get(groupPosition);
}
public long getChildId(int groupPosition, int childPosition)
{
return childPosition;
}
public int getChildrenCount(int groupPosition)
{
return 1;
}
public TextView getGenericView()
{
AbsListView.LayoutParams lp = new AbsListView.LayoutParams(
LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
TextView textView = new TextView(mContext);
textView.setLayoutParams(lp);
// Center the text vertically
textView.setGravity(Gravity.CENTER);
// Set the text starting position
textView.setPadding(55, 0, 0, 0);
return textView;
}
public View getChildView(int groupPosition, int childPosition, boolean isLastChild,
View convertView, ViewGroup parent)
{
TextView textView = getGenericView();
textView.setText(getChild(groupPosition, childPosition).toString());
return textView;
}
public Object getGroup(int groupPosition)
{
return Parents.get(groupPosition);
}
public int getGroupCount()
{
return Parents.size();
}
public long getGroupId(int groupPosition)
{
return groupPosition;
}
public View getGroupView(int groupPosition, boolean isExpanded, View convertView,
ViewGroup parent)
{
TextView textView = getGenericView();
textView.setText(getGroup(groupPosition).toString());
return textView;
}
public boolean isChildSelectable(int groupPosition, int childPosition)
{
return true;
}
public boolean hasStableIds()
{
return true;
}
}
這裏是我創建ExpandableListView代碼:
listNews = new ExpandableListView(this);
adapterNews = new DoubleStringArrayExpandableListAdapter();
adapterNews.mContext = this;
listNews.setAdapter(adapterNews);
listNews.setVerticalScrollBarEnabled(true);
listNews.setScrollbarFadingEnabled(false);
//listNews.setChoiceMode(ListView.CHOICE_MODE_SINGLE);
//listNews.setFocusableInTouchMode(true);
listNews.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, 200/*doesnt workLayoutParams.WRAP_CONTENT*/));
lLayout.addView(listNews);
adapterNews.Parents.add("Parent");
adapterNews.Children.add("Child");
任何想法,爲什麼它不工作,這裏有什麼錯?非常感謝=)