为listview写一个adapter，可以实现点击按钮查看每个列的数据

首先，需要定义一个数据模型类，用于存储每个列表项的数据：

public class ListItem {
    private String column1;
    private String column2;
    private String column3;

    public ListItem(String column1, String column2, String column3) {
        this.column1 = column1;
        this.column2 = column2;
        this.column3 = column3;
    }

    public String getColumn1() {
        return column1;
    }

    public void setColumn1(String column1) {
        this.column1 = column1;
    }

    public String getColumn2() {
        return column2;
    }

    public void setColumn2(String column2) {
        this.column2 = column2;
    }

    public String getColumn3() {
        return column3;
    }

    public void setColumn3(String column3) {
        this.column3 = column3;
    }
}

接下来，需要定义一个适配器类，用于将数据模型类中的数据绑定到列表项布局中：

public class MyListAdapter extends BaseAdapter {
    private Context mContext;
    private List<ListItem> mList;

    public MyListAdapter(Context context, List<ListItem> list) {
        mContext = context;
        mList = list;
    }

    @Override
    public int getCount() {
        return mList.size();
    }

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView == null) {
            convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item_layout, null);
            holder = new ViewHolder();
            holder.column1TextView = convertView.findViewById(R.id.column1_text_view);
            holder.column2TextView = convertView.findViewById(R.id.column2_text_view);
            holder.column3TextView = convertView.findViewById(R.id.column3_text_view);
            holder.showDataButton = convertView.findViewById(R.id.show_data_button);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        final ListItem item = mList.get(position);
        holder.column1TextView.setText(item.getColumn1());
        holder.column2TextView.setText(item.getColumn2());
        holder.column3TextView.setText(item.getColumn3());

        holder.showDataButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(mContext, "Column 1: " + item.getColumn1() + "\nColumn 2: " + item.getColumn2() + "\nColumn 3: " + item.getColumn3(), Toast.LENGTH_LONG).show();
            }
        });

        return convertView;
    }

    private static class ViewHolder {
        TextView column1TextView;
        TextView column2TextView;
        TextView column3TextView;
        Button showDataButton;
    }
}

在适配器的getView()方法中，通过ViewHolder来缓存列表项布局中的控件，避免频繁地调用findViewById()方法，提高性能。

在按钮的点击事件中，通过Toast来显示该列表项中每一列的数据。

最后，在Activity中使用这个适配器类来显示列表：

public class MyActivity extends AppCompatActivity {
    private ListView mListView;
    private MyListAdapter mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_my);

        mListView = findViewById(R.id.list_view);

        List<ListItem> list = new ArrayList<>();
        list.add(new ListItem("A1", "B1", "C1"));
        list.add(new ListItem("A2", "B2", "C2"));
        list.add(new ListItem("A3", "B3", "C3"));
        list.add(new ListItem("A4", "B4", "C4"));
        list.add(new ListItem("A5", "B5", "C5"));

        mAdapter = new MyListAdapter(this, list);
        mListView.setAdapter(mAdapter);
    }
}

这样就完成了列表的显示和按钮点击事件的处理。