ExpandableListView和CheckedTextView奇怪的行为

时间:2010-09-30 12:28:15

标签: android cursor expandablelistview

我有一个带有CursorTreeAdapter和CheckedTextView的ExpandableListActivity。 它在click上工作正常(我必须手动切换CheckedTextView,但这是因为这是一个ExpandableListView)但是当适配器调用游标上的requery时,检查的项目不正确(与之前相同)。

你对这个问题有什么线索吗?

3 个答案:

答案 0 :(得分:0)

这很可能是Android的回收列表。这是一个类似问题的问题:Android: Handle ListView Recycle。在您的情况下,您的适配器处理TextView标签的更新,因此这些看起来正确,但它不关心复选框状态。我有类似的问题,并通过提供我自己的适配器,基于SimpleExpandableListAdapter,但使用覆盖getChildView方法,它负责textview内容和复选框状态。

在这样的情况下,我发现窥探相应的Android源文件很有启发性,以找出真正发生的事情。在这种情况下,有趣的文件是ExpandableListView.javaSimpleExpandableListAdapter.java(基于我的适配器,在你的情况下是CursorTreeAdapter.java

答案 1 :(得分:0)

查看我的答案以保持已检查项目的状态。 。 访问Android ExpandableListView with Checkbox, Controlling checked state

答案 2 :(得分:0)

我与ExpandedListView有同样的问题。扩展/折叠其他组组件后,Switch或其他Checkable控件未保存语句。我已经通过将状态保存到childData列表/数组来解决了这个问题。

public class ExpandPrefAdapter extends BaseExpandableListAdapter {

private static final String TAG = ExpandPrefAdapter.class.getName();

private List<String> mGroupTitle = new ArrayList<>();
private Context mContext;
private List<List<ExpandableListItem>> mChildData = new ArrayList<>();

public ExpandPrefAdapter(Context context, final List<String> groupTitle, final
List<List<ExpandableListItem>> childData) {
    mContext = context;
    mGroupTitle = groupTitle;
    mChildData = childData;
}

@Override
public View getChildView(int listPosition, final int expandedListPosition,
                         boolean isLastChild, View convertView, ViewGroup parent) {

    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View rootView = inflater.inflate(R.layout.content_pref_entry, parent, false);

    final int groupPos = listPosition;
    final int childPos = expandedListPosition;

    ExpandableListItem item = (ExpandableListItem) getChild(listPosition, expandedListPosition);

    TextView textViewPrefTitle = (TextView) rootView.findViewById(R.id.text_view_pref_title);
    textViewPrefTitle.setText(item.getTitle());

    final Switch switchView = (Switch) rootView.findViewById(R.id.switch_pref);
    switchView.setChecked(mChildData.get(groupPos).get(childPos).isChecked());
    switchView.setOnCheckedChangeListener((v, b) -> mChildData.get(groupPos).get(childPos).setChecked(b));
    return rootView;
}

@Override
public int getChildrenCount(int listPosition) {
    return mChildData.get(listPosition).size();
}

@Override
public Object getChild(int listPosition, int expListPosition) {
    return mChildData.get(listPosition).get(expListPosition);
}

@Override
public long getChildId(int listPosition, int expandedListPosition) {
    return expandedListPosition;
}

@Override
public Object getGroup(int listPosition) {
    return mGroupTitle.get(listPosition);
}

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

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

@Override
public View getGroupView(int listPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {

    String groupTitle = (String) getGroup(listPosition);
    if (convertView == null) {
        LayoutInflater mInflater = (LayoutInflater) mContext.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = mInflater.inflate(R.layout.content_pref_group, null);
    }
    TextView textViewGroup = (TextView) convertView
            .findViewById(R.id.text_view_pref_group_title);
    textViewGroup.setText(groupTitle);
    Log.wtf(TAG, "getGroupView(): listPosition: " + listPosition + " isExpanded: " + isExpanded);
    return convertView;
}

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

@Override
public boolean isChildSelectable(int listPosition, int expandedListPosition) {
    return false;
}
}

我想这会对你有所帮助