Question

我正在尝试在列表行中显示单独的项目。所以我使用了4个textviews。但我使用arrayadapter扩展Activity。现在我必须根据textview将字符串列表放在一行中。怎么做到这一点？任何帮助都非常感谢，并提前感谢...

Answer 1

通常我会在这种情况下延长ArrayAdapter。通常，您只需要在适配器中覆盖两个函数 - getView（）和一个构造函数。

适配器的代码如下：

/** class to act as list adapter for rows List */
private static class FourTextListAdapter extends ArrayAdapter<MyDataClass> {

    /** To cache views of item */
    private static class ViewHolder {
        private TextView text1;
        private TextView text2;
        private TextView text3;
        private TextView text4;

        /**
         * General constructor
         */
        ViewHolder() {
            // nothing to do here
        }
    }

    /** Inflater for list items */
    private final LayoutInflater inflater;

    /**
     * General constructor
     *
     * @param context
     * @param resource
     * @param textViewResourceId
     * @param objects
     */
    public FourTextListAdapter(final Context context,
            final int resource,
            final int textViewResourceId,
            final List<User> objects) {
        super(context, resource, textViewResourceId, objects);

        this.inflater = LayoutInflater.from(context);
    }

    @Override
    public View getView(final int position, final View convertView, final ViewGroup parent) {

        View itemView = convertView;
        ViewHolder holder = null;
        final MyDataClass item = getItem(position);

        if(null == itemView) {
            itemView = this.inflater.inflate(R.layout.four_texts_item, parent, false);

            holder = new ViewHolder();

            holder.text1 = (TextView)itemView.findViewById(R.id.text1);
            holder.text2 = (TextView)itemView.findViewById(R.id.text2);
            holder.text3 = (TextView)itemView.findViewById(R.id.text3);
            holder.text4 = (TextView)itemView.findViewById(R.id.text4);

            itemView.setTag(holder);
        } else {
            holder = (ViewHolder)itemView.getTag();
        }

        holder.text1.setText(item.getText1());
        holder.text2.setText(item.getText2());
        holder.text3.setText(item.getText3());
        holder.text4.setText(item.getText4());

        return itemView;
    }
}

Answer 2

而不是使用ArrayAdapter尝试使用SimpleAdapter。

ArrayList<HashMap<String, String>> sampleArrayList;
SimpleAdapter sampleListAdapter;

HashMap<String, String> sampleObjectMap;

for (SampleObject sampleObj : sampleList) {
    sampleObjectMap= new HashMap<String, String>();
        sampleObjectMap.put("value1", sampleObj.getValue1());
        sampleObjectMap.put("value2", sampleObj.getValue2());
    sampleObjectMap.put("value3", sampleObj.getValue3());
     sampleObjectMap.put("value4", sampleObj.getValue4());

        sampleArrayList.add(sampleObjectMap);
}

sampleListAdapter= new SimpleAdapter(
            context, sampleArrayList,
            R.layout.custom_list_layout, new String[] {
                    "value1", "value2" , "value3", "value4"},
                    new int[] { R.id.list_content_column1,
                            R.id.list_content_column2,
                            R.id.list_content_column3,
                            R.id.list_content_column4});

        sampleListView.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                HashMap<String, String> sampleObjectMapLocal = sampleArrayList
                                    .get(position);
                final String value1Obj = sampleObjectMapLocal                                       .get("value1");

                System.out.println("value1Obj : " + value1Obj);

            }
        });

在上面的代码中，使用ArrayList sampleArrayList 填充listView内容所以可以使用键（“value1”，“value2”，“value3”，“value4”）访问任何列的项目。

希望这会有所帮助。

如何在ArrayAdapter中为列表视图使用多个textview？

2 个答案: