Question

我希望我的ExpandableListView在用户展开群组时自动滚动，以便展开的群组标题位于屏幕顶部。我尝试了smoothScrollToPosition，但这只是确保扩展组在屏幕上的某个位置可见。我想明确地滚动它，以便扩展组位于顶部，如下例所示：

Before expanding Group 3:                After expanding Group 3:

+=================+                      +=================+
| Group 1         |                      | Group 3         |
+-----------------+                      +-----------------+
| Group 2         |                      |   Grp 3 Child 1 |
+-----------------+                      +-----------------+
| Group 3         |                      |   Grp 3 Child 2 |
+-----------------+                      +-----------------+
| Group 4         |                      | Group 4         |
+=================+                      +=================+

Answer 1

ListView.setSelection(position)

这将滚动到所选项目，当你点击组项目时调用它。

Answer 2

以下代码是适合我的解决方案

public boolean onGroupClick(ExpandableListView parent, View v,int groupPosition, long id) {
    // TODO Auto-generated method stub
    //mExpandableList.setSelectionFromTop(groupPosition, 0);

Boolean shouldExpand = (!mExpandableList.isGroupExpanded(groupPosition));        
    mExpandableList.collapseGroup(lastClickedPosition);

    if (shouldExpand){
        //generateExpandableList();
        mExpandableList.expandGroup(groupPosition);
        mExpandableList.setSelectionFromTop(groupPosition, 0);
    }                
    lastClickedPosition = groupPosition;
    return true;        
}

Answer 3

这对我有用。把它放在适配器中：

public void onGroupExpanded(final int groupPosition) {
    super.onGroupExpanded(groupPosition);

    listView.setSelectedGroup(groupPosition);
}

Answer 4

将此属性android:transcriptMode="disabled"添加到xml的ExpandibleListView标记中。这应该有用。

Answer 5

这个适合我

expandList.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {

            if (!parent.isGroupExpanded(groupPosition)) {
                parent.expandGroup(groupPosition);
            } else {
                parent.collapseGroup(groupPosition);
            }
            parent.setSelectedGroup(groupPosition);

            return true;
        }
    });

作为滚动的主要工作部分是

parent.setSelectedGroup(groupPosition);

Answer 6

将android:transcriptMode="disabled"设置为ExpandibleListView也适用于我。如果参数设置为“normal”，则无法使用任何方法（setSelectedGroup，setSelectionFromTop等）。

只有setSmoothScroll有效，但不喜欢效果。

Answer 7

以下代码适用于我。希望它会有所帮助。在onGroupExpand中实现OnGroupExpandListener使用下面的代码

public void onGroupExpand(final int groupPosition) {
super.onGroupExpand(groupPosition);

expandableListView.post(new Runnable() {

    @Override
    public void run() {
        expandableListView.setSelection(groupPosition);
        if(expandableListView.getChildAt(groupPosition)!=null)
        expandableListView.requestChildRectangleOnScreen(expandableListView.getChildAt(groupPosition),
                new Rect(0, 0, expandableListView.getChildAt(groupPosition).getRight(), expandableListView.getChildAt(groupPosition).getHeight()), false);
    }
});

}

Answer 8

setSelectedGroup有效，但如果您希望获得平滑的滚动效果，请使用下面给出的smoothScrollToPositionFromTop：

    expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {
        @Override
        public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
            parent.smoothScrollToPositionFromTop(groupPosition,0);
            if (expandableListView.isGroupExpanded(groupPosition))
                expandableListView.collapseGroupWithAnimation(groupPosition);
            else expandableListView.expandGroupWithAnimation(groupPosition);
            return true;
        }
    });

在ExpandableListView中自动滚动

8 个答案: