列表活动两行列表项替代项

android java listactivity

2022-09-04 01:50:57

我注意到 TwoLineListItem 从 API 17 开始被弃用。如果我按如下方式设置 ListActivity 适配器，则有什么替代方法？

ArrayAdapter<File> adapter = new ArrayAdapter<File>(this,android.R.layout.simple_list_item_2,filesArrayList){
            @Override
            public View getView(int position, View convertView, ViewGroup parent){
                final TwoLineListItem row;
                if(convertView == null){
                    LayoutInflater inflater = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                    row = (TwoLineListItem)inflater.inflate(android.R.layout.simple_list_item_2, null);
                }else{
                    row = (TwoLineListItem)convertView;
                }
                row.getText1().setText(filesArrayList.get(position).getTitle());
                row.getText2().setText2(filesArrayList.get(position).getDescription());
                return row;
            }

        };

答案 1

只需将 TwoLineListItem 源代码剪切并粘贴到您自己的布局中：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView android:id="@+id/text1"
        android:textSize="16sp"
        android:textStyle="bold"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

    <TextView android:id="@+id/text2"
        android:textSize="16sp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

（请注意，为了保持一致性，我更改了 id。

现在使用 ViewHolder 来保留对两个 TextView 的引用：

public View getView(int position, View convertView, ViewGroup parent){
    ViewHolder holder;
    if(convertView == null){
        // You should fetch the LayoutInflater once in your constructor
        LayoutInflater inflater = (LayoutInflater)getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = inflater.inflate(R.layout.list_item_2, null);

        // Initialize ViewHolder here
    }else{
        holder = (ViewHolder) convertView.getTag();
    }

    File file = filesArrayList.get(position);
    holder.text1.setText(file.getTitle());
    holder.text2.setText2(file.getDescription());
    return convertView;
}

答案 2

我是这样做到的：

    mAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_2, mListItems)
    {
        @Override
        public View getView(int position, View convertView, ViewGroup parent)
        {
            View row;
            if(convertView == null)
            {
                row = (View)mInflater.inflate(android.R.layout.simple_list_item_2, parent, null);
            }
            else
            {
                row = (View)convertView;
            }
            TextView v = (TextView) row.findViewById(android.R.id.text1);
            v.setText(mListItems[position]);
            v = (TextView) row.findViewById(android.R.id.text2);
            v.setText(mListSubItems[position]);
            return row;
        }
    };

    ListView lv = (ListView) getActivity().findViewById(R.id.runsListView);
    lv.setAdapter(mAdapter);
    lv.setOnItemClickListener(mMessageClickedHandler);