动态添加/删除Spinner 菜单

package com.turboradio.googlesdk;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;

public class Ex04_09_Spinner extends Activity {
    private static final String [] countriesStr = {
        "北京市","上海市","天津市","重庆市"
    };
    private TextView myTextView;
    private EditText myEditText;
    private Spinner mySpinner;
    private ArrayAdapter<String> adapter;
    private List<String> allCountries;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ex_04_09);
        allCountries = new ArrayList<String>();
        for(int i = 0;i<countriesStr.length;i++){
            allCountries.add(countriesStr[i]);
        }
        adapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,allCountries);
        /**设置Item的样式**/
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
        myTextView = (TextView)findViewById(R.id.text1);
        myEditText = (EditText)findViewById(R.id.edit);
        mySpinner = (Spinner)findViewById(R.id.spinner);
        mySpinner.setAdapter(adapter);
        mySpinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener(){

            public void onItemSelected(AdapterView<?> parent, View view,
                    int position, long id) {
                myTextView.setText(parent.getSelectedItem().toString());
                
            }

            public void onNothingSelected(AdapterView<?> arg0) {
                // TODO Auto-generated method stub
                
            }});
        
    }
    /**
     * 添加按钮事件
     */
    public void addSpinnerItem(View v){
        String newCountry = myEditText.getText().toString();
        /**先判断值是否存在，不存在再添加**/
        for(int i = 0;i<adapter.getCount();i++){
            if(newCountry.equals(adapter.getItem(i))){
                return;
            }
        }
        if(!newCountry.equals("")){
            adapter.add(newCountry);
            int position = adapter.getPosition(newCountry);
            mySpinner.setSelection(position);
            myEditText.setText("");
        }
    }
    /**
     * 删除按钮事件
     */
    public void removeSpinnerItem(View v){
        if(mySpinner.getSelectedItem() != null){
            /**删除mySpinner的值**/
            adapter.remove(mySpinner.getSelectedItem().toString());
            myEditText.setText("");
            if(adapter.getCount() == 0){
                myTextView.setText("");
            }
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <TextView 
        android:id="@+id/text1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <EditText 
        android:id="@+id/edit"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
    <Button 
        android:id="@+id/add"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="添加"
        android:onClick="addSpinnerItem"
        />
    <Button 
        android:id="@+id/delete"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="删除"
        android:onClick="removeSpinnerItem"
        />
    <Spinner 
        android:id="@+id/spinner"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        />
</LinearLayout>