Android简易实战教程--第四十二话《Spinner下拉级联效果》

本篇承接第四十话第四十话《Spinner》

参考博客：http://blog.csdn.net/yayun0516

进入正题：

Strings加入第一级数据：

   <string-array name="province">

        <item >水果</item>

        <item >职位</item>

        <item >动物</item>

    </string-array> 

来个布局：

<?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" >

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:orientation="horizontal" >

        <Spinner

            android:id="@+id/spinner1"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:entries="@array/province"/>

        <Spinner

            android:id="@+id/spinner2"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content" />

    </LinearLayout>

    <TextView

        android:text="nihao"

        android:id="@+id/text"

        android:textColor="#00ff00"

        android:layout_width="match_parent"

        android:layout_height="wrap_content" >

    </TextView>

</LinearLayout>

总共两级菜单，一个文本。

主活动代码如下：

package com.ydl.test;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemSelectedListener;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.TextView;

public class MainActivity extends Activity {

    private Spinner spinner1;

    private Spinner spinner2;

    private TextView textView;

    private String string1;

    private String[][] dataStrings = { { "苹果", "香蕉", "梨子", "菠萝", "草莓", },

            { "教师", "工人", "程序员", }, { "老虎", "狮子", "大象", }, };

    private ArrayAdapter<CharSequence> adapter = null;

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState); // 生命周期方法

        super.setContentView(R.layout.activity_main); // 设置要使用的布局管理器

        spinner1 = (Spinner) findViewById(R.id.spinner1);

        spinner2 = (Spinner) findViewById(R.id.spinner2);

        textView = (TextView) findViewById(R.id.text);

        spinner1.setOnItemSelectedListener(new OnItemSelectedListener() {

			public void onItemSelected(AdapterView<?> parent, View view,

                    int position, long id) {

                adapter = new ArrayAdapter<CharSequence>(MainActivity.this,

                        android.R.layout.simple_spinner_item,

                        dataStrings[position]);//根据position确定第二个spinner中要填充的数据

                adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);//设置点击下拉窗体的显示样式

                //给spinner2设置adapter

                spinner2.setAdapter(adapter);

                //parent指的是 spinner1

                string1 = parent.getItemAtPosition(position).toString();// 获取当前显示省份

            }

            public void onNothingSelected(AdapterView<?> parent) {

                // TODO Auto-generated method stub

            }

        });

        spinner2.setOnItemSelectedListener(new OnItemSelectedListener() {

            public void onItemSelected(AdapterView<?> parent, View view,

                    int position, long id) {

            	//parent指的是 spinner2

                String string2 = parent.getItemAtPosition(position).toString();// 获取当前显示省份

                textView.setText(string1 +" : "+ string2);

            }

            public void onNothingSelected(AdapterView<?> parent) {

                // TODO Auto-generated method stub

            }

        });

    }

}

运行程序如下：

连通完成~

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