Android - 如何在单击列表项时将字体设置为粗体

Question

我试图在点击它时将行设置为粗体.但是当我尝试将视图转换为TextView时,它给出了一个ClassCastException,如下所示 -

setListAdapter(adapter);
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
  int position, long id) {
            TextView tv = (TextView)view;
            tv.setTypeface(null, Typeface.BOLD);
        }
        });

我究竟做错了什么？我该怎么办呢？

编辑:

我的适配器看起来像 -

public class CountryListAdapter extends ArrayAdapter<String> {
private final Activity context;
private final ArrayList<String> names;

public CountryListAdapter(Activity context, ArrayList<String> names) {
    super(context, R.layout.rowlayout, names);
    this.context = context;
    this.names = names;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = context.getLayoutInflater();
    View rowView = inflater.inflate(R.layout.rowlayout, null, true);
    TextView textView = (TextView) rowView.findViewById(R.id.label);
    textView.setText(names.get(position));

    return rowView;
}
}

Answer 1

您的适配器代码显示失败的主要原因:

根据你的适配器代码,view你所使用的是rowView,而不是textView.所以你也应该以这种方式访问​​它.这就是你得到的原因ClassCastException.

 public void onItemClick(AdapterView<?> parent, View view,
 int position, long id) {
        View rowView = view
        TextView tv = (TextView) rowView.findViewById(R.id.label);
        tv.setTypeface(null, Typeface.BOLD);
    }
    });