Android 里面的ViewHolder找不到

import android.content.Context;
import android.view.LayoutInflater;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.List;

/**

• Created by xiao on 2016/7/29.
  */
  public class MsgAdapter extends ArrayAdapter {
  private int resourceID;

  public MsgAdapter(Context context, int textViewResourcedId, List objects) {
  super(context, textViewResourcedId, objects);
  resourceID = textViewResourcedId;

  }

  @Override
  public View getView(int postion, View convertView, ViewGroup parent) {
  Msg msg = getItem(postion);
  View view;

  ViewHolder viewHolder;
  if (convertView == null) {
      view = LayoutInflater.from(getContext()).inflate(resourceID, null);
      viewHolder = new ViewHolder();
      viewHolder.leftLayoyt = (LinearLayout) view.findViewById(R.id.left_layout);
      viewHolder.rightLayout = (LinearLayout) view.findViewById(R.id.right_layout);
      viewHolder.leftMsg = (TextView) view.findViewById(R.id.left_msg);
      viewHolder.rightMsg = (TextView) view.findViewById(R.id.righy_msg);
  } else {
      view = convertView;
      viewHolder = (ViewHolder) view.getTag();
  

ViewHolder是自己定义的类啊

ViewHolder需要自己定义

class ViewHolder {
//这里面写你自己的控件
private TextView testTV；
private Button testBtn；

}

这玩意儿是需要自定义的