OnKeyListener cannot be resolved to a type

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 package com.professionAlandroiddevelopmet.hellworld;
 
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
 
public class HelloWord extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle icicle) { setContentView(R.layout.main); ListView myListView = (ListView)findViewById(R.id.myEditText);
    final EditText myEditText = (EditText)findViewById(R.id.myEditText); final ArrayList<String> todoItens = new ArrayList<String>(); final ArrayAdapter<String> aa; aa = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,todoItens); myListView.setAdapter(aa); 这一行有问题 myEditText.setOnKeyListener(new OnKeyListener() { public boolean onKey(View v, int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) if (keyCode == KeyEvent.KEYCODE_ENTER) { todoItems.add(0, myEditText.getText().toString()); myEditText.setText(""); aa.notifyDataSetChanged(); return true; } return false; } }); }
}