如何在可扩展列表视图上插入标题行 [英] How to insert header row on Expandable List View

问题描述

我有一个带有一个可扩展列表视图的Android活动.然后，我创建了ExpandableListAdapter，因此可以单击一个项目，然后可以看到该项目的子项目.还行吧. 现在，我想为每个项目的子项列表插入一个标准标题(标题).所以我建立了这段代码:

I have an Android activity with one expandable list view. Then I have created my ExpandableListAdapter, so I can click on one items and I can see the child of this item. This is ok. Now I want to insert a standard header (Title) for a list of child to every items. So I have build this code:

public class ResultExpandableListAdapter extends BaseExpandableListAdapter {

    private Context context;
    private List<Result> listaRisultati;
    private HashMap<Integer, List<ResultXResult>> expandableListDetail;

    public ResultExpandableListAdapter(Context context, List<Result> listaRisultati,
                                       HashMap<Integer, List<ResultXResult>> expandableListDetail) {
        this.context = context;
        this.listaRisultati = listaRisultati;
        this.expandableListDetail = expandableListDetail;
    }

    @Override
    public Object getChild(int listPosition, int expandedListPosition) {
        return this.expandableListDetail.get(this.listaRisultati.get(listPosition).getId())
                .get(expandedListPosition);
    }

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

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

        if (convertView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) this.context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

            if(expandedListPosition ==0)
            {
                convertView = layoutInflater.inflate(R.layout.results_x_result_list_item_header, null);
            }

            if(expandedListPosition>0 && expandedListPosition<=getChildrenCount(expandedListPosition))
            {
                ResultXResult risultato = (ResultXResult) getChild(listPosition, expandedListPosition);
                convertView = layoutInflater.inflate(R.layout.results_x_result_list_item,null);

                TextView parameter = (TextView) convertView
                        .findViewById(R.id.parameter);

                TextView valueUM = (TextView) convertView
                        .findViewById(R.id.valueUm);

                TextView interpretation = (TextView) convertView
                        .findViewById(R.id.interpretation);

                TextView um = (TextView) convertView
                        .findViewById(R.id.um);


                parameter.setText(risultato.getInfo().getDisplayName());
                valueUM.setText(risultato.getValue());
                interpretation.setText(risultato.getInterpretationCode().getDisplayName());
                um.setText(risultato.getUnitaDiMisura());
            }
        }

        return convertView;
    }

    @Override
    public int getChildrenCount(int listPosition) {
        return this.expandableListDetail.get(this.listaRisultati.get(listPosition).getId())
                .size();
    }

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

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

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

    @Override
    public View getGroupView(int listPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        Result result = (Result) getGroup(listPosition);
        if (convertView == null) {
            LayoutInflater layoutInflater = (LayoutInflater) this.context.
                    getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = layoutInflater.inflate(R.layout.results_list_row, null);
        }
        TextView examination = (TextView) convertView
                .findViewById(R.id.examination);
        TextView startDate = (TextView) convertView
                .findViewById(R.id.startDate);
        TextView endDate = (TextView) convertView
                .findViewById(R.id.endDate);
        examination.setTypeface(null, Typeface.BOLD);

        examination.setText(result.getInfo().getDisplayName());
        startDate.setText(result.getDateStart());
        endDate.setText(result.getDateEnd()!=null ? result.getDateEnd()+" " : " ");
        return convertView;
    }

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

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

我的临时解决方案是在方法"getChildView"中，如果是第一行，则可以插入一个layour，如果是另一行，则可以打印数据.因此，使用此代码，如果我有一个包含2个项目的ResultXResult列表，例如，我只能读取第二个项目.

The my temporary solution is in the method "getChildView", if is the first row, I can insert one layour, if is another row, I print the data. So with this code, if I have a list of ResultXResult with 2 Items (for example), I can read only the second items.

有解决此问题的方法，还是有另一种方法可以在子视图中插入标头?

There is a solution of this problem, or there is another method to insert a header in child view?

这是我正在运行的应用:

This is my app running:

我的标题行是黄色行参数，值...".

The header row for me is the yellow row "Parameter, Value...."

推荐答案

您可以使用以下代码轻松地将标头添加到expandablelistview:

You cam easily add header to expandablelistview by using the code below :

View header=getLayoutInflater().inflate(R.layout.nav_header, null);
 mExpandableListView.addHeaderView(header);

只需在您的活动中复制以上代码即可.在上面的代码中(R.layout.nav_header)是header的xml文件，而mExpandableListView是ExpandableListView的对象.

Just copy the above code in your activity. In the above code (R.layout.nav_header) is the xml file of header and mExpandableListView is the object of ExpandableListView.

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