关于eclipse中MENU按键没反应

package com.example.activitytest;

import android.app.Activity;
 import android.os.Bundle;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.view.Window;
 import android.widget.Button;
 import android.widget.Toast;

public class FirstActivity extends Activity {

@Override
 protected void onCreate(Bundle savedInstanceState){
 super.onCreate(savedInstanceState);
 requestWindowFeature(Window.FEATURE_NO_TITLE);
 setContentView(R.layout.first_layout);
 Button button1 = (Button) findViewById(R.id.button_1);
 button1.setOnClickListener(new OnClickListener() {
 public boolean onOptionsItemSelected(MenuItem item) {
 switch (item.getItemId()){
 case R.id.add_item:
 Toast.makeText(FirstActivity.this,"You clicked Add",Toast.LENGTH_SHORT).show();
 break;
 case R.id.remove_item:
 Toast.makeText(FirstActivity.this,"You clicked Remove",Toast.LENGTH_SHORT).show();
 break;
 default:
 }
 return true;
 }
 @Override
 public void onClick(View v) {
 Toast.makeText(FirstActivity.this, "You clicked Button 1",
 Toast.LENGTH_SHORT).show();
 }
 });
 }

/**
@param args */ public static void main(String[] args) { // TODO Auto-generated method stub

}

}