更改ExpandableListView的初始状态

Question

我无法更改ExpandableListView的初始状态，我希望它显示为＆＃34;打开＆＃34;起初。

Answer 1

使用它可视化标记：

    android:checkMark="?android:attr/listChoiceIndicatorMultiple"

然后用它来改变初始状态

    android:checked="true"

或者

    mCheckedTextView.setChecked(true);

这是我的CheckedTextView：

    <CheckedTextView
        android:id="@+id/checkedTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp"
        android:checkMark="?android:attr/listChoiceIndicatorMultiple"
        android:checked="true"
        android:text="CheckedTextView" />

Answer 2

从SimpleExpandableListAdapter扩展并覆盖getGroupView：

@Override
public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
    View view = super.getGroupView(groupPosition, isExpanded, convertView, parent);
    ExpandableListView mExpandableListView = (ExpandableListView) parent;
    mExpandableListView.expandGroup(groupPosition);
    return view;
}