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我正在尝试通过 Internet 为我的答案找到一个解决方案,但我找不到一个好的解决方案。我看了这个主题:Android ExpandableListView Child Headers但它对我不起作用。

我现在拥有的(屏幕):

我的代码是:

private void fillData() {
    ExpandableListView lv;
    lv = (ExpandableListView) getActivity().findViewById(R.id.grades_view);
    lv.setItemsCanFocus(false);
    lv.setChoiceMode(ExpandableListView.CHOICE_MODE_SINGLE);

    View view = View.inflate(getActivity(), R.layout.list_header, null);
    lv.addHeaderView(view, null, false);

    dbh = new DatabaseHelper(getActivity());
    MyExpandableListAdapter mAdapter = new MyExpandableListAdapter(
            getActivity(), dbh);
    mAdapter.synchronize();
    lv.setAdapter(mAdapter);
    registerForContextMenu(lv);
}

public class MyExpandableListAdapter extends BaseExpandableListAdapter {

    private List<Subject> mSubjects = new ArrayList<Subject>();
    private List<List<Course>> mCourse = new ArrayList<List<Course>>();
    private DatabaseHelper dbh;
    private LayoutInflater inflater;

    public MyExpandableListAdapter(Context context, DatabaseHelper dbh) {
        this.dbh = dbh;
        this.inflater = LayoutInflater.from(context);
    }

    public void synchronize() {

        mSubjects = dbh.getSubjects();

        for (Subject s : mSubjects) {
            mCourse.add(dbh.getCourses(s));
        }
    }

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

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

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        Course c = (Course) getChild(groupPosition, childPosition);

        if (convertView == null)
            convertView = inflater.inflate(R.layout.list_item_child,
                    parent, false);

        TextView txt = (TextView) convertView.findViewById(R.id.code);
        txt.setText(c.getCode());
        TextView txt1 = (TextView) convertView.findViewById(R.id.ects);
        txt1.setText(String.valueOf(c.getEcts()));
        TextView txt2 = (TextView) convertView.findViewById(R.id.grade);

        if (c.getGrade() == -1) {
            txt2.setText("-");
        } else {
            txt2.setText(String.valueOf(c.getGrade()));
        }

        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return mCourse.get(groupPosition).size();
    }

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

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

    @Override
    public long getGroupId(int groupPosition) {
        return mSubjects.get(groupPosition).hashCode();
    }

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

        Subject s = (Subject) getGroup(groupPosition);

        if (convertView == null)
            convertView = inflater.inflate(R.layout.list_item, parent,
                    false);

        TextView txt1 = (TextView) convertView.findViewById(R.id.name);
        txt1.setText(String.valueOf(s.getName()));
        TextView txt2 = (TextView) convertView.findViewById(R.id.semester);
        txt2.setText(String.valueOf(s.getSemester()));

        return convertView;

    }

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

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

}

正如我们所看到的,为了放置我使用的第一级标题(名称和 Sem):

View view = View.inflate(getActivity(), R.layout.list_header, null);
lv.addHeaderView(view, null, false);

但我不知道如何对孩子们做同样的事情(带有代码、ECTS 和等级的标题)。

先感谢您。

4

3 回答 3

5

1.-在组的 xml 中包含标题,例如:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >
    //Your elementsof group
</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/headerList"
    android:orientation="horizontal" >
    //the elements of your header (ID,counter, description, etc..)
</LinearLayout>

2.-现在,在您的方法 getGroupView() 中使用该 ID ...

LinearLayout headerList = (LinearLayout) view.findViewById(R.id.headerList);
    if(isExpanded)
        headerList.setVisibility(View.VISIBLE);
    else
        headerList.setVisibility(View.GONE);

一年后,我希望它对你有用:)

于 2014-07-07T16:15:09.580 回答
1

Guillermo Orellana Ruiz 的上述解决方案可以正常工作,但请注意,只有将“额外的孩子” 添加到第 0 个位置的子元素数组中,才会显示所有确切的子元素,否则将显示一个子元素缺少,如果您没有在子数组或子元素的第 0 个位置添加一个 额外的子元素,,

根据我对任务的理解,当添加一个“额外的孩子”时,第 0 个位置会占据那个“额外的孩子”并且不会显示那个孩子,而不是那个“额外的孩子”,而是显示标题视图,这个由以下人员完成:

      if (childPosition == 0) {
       // your header
        convertView = inflater.inflate(R.layout.list_item_child, null);            

        return convertView;
    } 

另请注意,添加到子数组的额外孩子 必须保持在第 0 位,否则额外的孩子将显示在您的孩子列表视图中,而您在第 0 位的实际数据将不会显示

我刚刚提到这一点是因为当我将这段代码用于我的任务时,其中一个子元素没有显示,它丢失了,我想了一会儿,所以我花了一些时间来理解这一点,所以我把它发布为a 请注意,使用已接受答案的人不得浪费他/她的时间。

于 2013-10-01T07:36:06.557 回答
1

只需添加一个“额外的孩子”

    @Override
    public Object getChild(int groupPosition, int childPosition) {
        if (childPosition == 0)
            return null;

        return mCourse.get(groupPosition).get(childPosition - 1);
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {
        if (childPosition == 0)
            return 0;

        return getChild(groupPosition, childPosition).hashCode();
    }

    @Override
    public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

        if (childPosition == 0) {
            convertView = inflater.inflate(R.layout.list_item_child, null);

            // your special header

            return convertView;
        } 

        // rest of your method

    }

你可以有不同的布局或任何你喜欢的地方。

于 2013-06-11T18:22:17.157 回答