android应用开发之spinner控件的简单使用

package com.mecury.spinnertest;
import java.util.ArrayList;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
public class MainActivity extends ActionBarActivity {
  private Spinner spinnerButton;
  private Spinner spinner;
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    spinnerButton = (Spinner) findViewById(R.id.spinnerButton);
    spinner = (Spinner) findViewById(R.id.spinner2);
    /*静态的显示下来出来的菜单选项，显示的数组元素提前已经设置好了
     * 第二个参数：已经编写好的数组
     * 第三个数据：默认的样式
     */
    ArrayAdapter<CharSequence> adapter = 
    ArrayAdapter.createFromResource(this, R.array.number_array, android.R.layout.simple_spinner_item);
    //设置spinner中每个条目的样式，同样是引用android提供的布局文件
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinnerButton.setAdapter(adapter);
    spinnerButton.setPrompt("测试");
    spinnerButton.setOnItemSelectedListener(new spinnerListener());
    /*
     * 动态添显示下来菜单的选项，可以动态添加元素
     */
    ArrayList<String> list = new ArrayList<String>();
    list.add("1.苹果");
    list.add("2.橘子");
    /*
     * 第二个参数是显示的布局
     * 第三个参数是在布局显示的位置id
     * 第四个参数是将要显示的数据
     */
    ArrayAdapter adapter2 = new ArrayAdapter(this, R.layout.item, R.id.textview,list);
    spinner.setAdapter(adapter2);
    spinner.setOnItemSelectedListener(new spinner2Listener());
  }
  class spinnerListener implements android.widget.AdapterView.OnItemSelectedListener{
    @Override
    public void onItemSelected(AdapterView<?> parent, View view,
        int position, long id) {
      //将选择的元素显示出来
      String selected = parent.getItemAtPosition(position).toString();
    }
    @Override
    public void onNothingSelected(AdapterView<?> parent) {
      System.out.println("nothingSelect");
    }
  }
  class spinner2Listener implements android.widget.AdapterView.OnItemSelectedListener{
    @Override
    public void onItemSelected(AdapterView<?> parent, View view,
        int position, long id) {
      String selected = parent.getItemAtPosition(position).toString();
    }
    @Override
    public void onNothingSelected(AdapterView<?> parent) {
      System.out.println("nothingSelect");
    }
  }
}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  android:padding="10dp"
  tools:context="com.mecury.spinnertest.MainActivity" >
  <TextView 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="这是静态的："/>
  <Spinner 
    android:id="@+id/spinnerButton"
    android:layout_width="match_parent"
    android:layout_height="30dp"/>
  <TextView 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="这是动态的："/>
  <Spinner 
    android:id="@+id/spinner2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
</LinearLayout>

<string-array name="number_array">
    <item>1000</item>
    <item>2000</item>
    <item>3000</item>
    <item>4000</item>
    <item>5000</item>
    <item>6000</item>
    <item>7000</item>
    <item>8000</item>
    <item>9000</item>
  </string-array>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="#00ffff"
  android:padding="10dp"
  android:orientation="vertical" >
  <TextView 
    android:id="@+id/textview"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:textSize="20dp"/>
</LinearLayout>