多层下拉选择框的实现。

package com.lixu.duocengxiala;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;

import android.view.View;
import android.view.ViewGroup;
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 static final String CITY = "city";
    ArrayList<String> citys = null;
    ArrayList<String> qu = null;
    int p = 0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        String[] sheng = this.getResources().getStringArray(R.array.sheng);
        final String[] city_sichuan = this.getResources().getStringArray(R.array.city_sichuan);
        final String[] city_guangdong = this.getResources().getStringArray(R.array.city_guangdong);
        final String[] city_shanxi = this.getResources().getStringArray(R.array.city_shanxi);
        final String[] qu_chengdu = this.getResources().getStringArray(R.array.qu_chengdu);
        final String[] qu_mianyang = this.getResources().getStringArray(R.array.qu_mianyang);
        final String[] qu_guangyuan = this.getResources().getStringArray(R.array.qu_guangyuan);
        final String[] qu_taiyuan = this.getResources().getStringArray(R.array.qu_taiyuan);
        final String[] qu_guangzhou = this.getResources().getStringArray(R.array.qu_guangzhou);

        citys = new ArrayList<String>();
        qu = new ArrayList<String>();

        Spinner sp1 = (Spinner) findViewById(R.id.sp1);
        Spinner sp2 = (Spinner) findViewById(R.id.sp2);
        Spinner sp3 = (Spinner) findViewById(R.id.sp3);

        final MyAdapter1 mMyAdapter1 = new MyAdapter1(this, -1, sheng);
        final MyAdapter2 mMyAdapter2 = new MyAdapter2(this, -1, citys);
        final MyAdapter3 mMyAdapter3 = new MyAdapter3(this, -1, qu);

        sp1.setAdapter(mMyAdapter1);
        sp2.setAdapter(mMyAdapter2);
        sp3.setAdapter(mMyAdapter3);

        sp1.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int possheng, long arg3) {
                p = possheng;
                switch (possheng) {
                case 0:
                    citys.clear();
                    for (String n : city_sichuan)
                        citys.add(n);
                    mMyAdapter2.notifyDataSetChanged();

                    break;
                case 1:
                    citys.clear();
                    for (String n : city_shanxi)
                        citys.add(n);
                    mMyAdapter2.notifyDataSetChanged();

                    break;
                case 2:

                    citys.clear();
                    for (String n : city_guangdong)
                        citys.add(n);
                    mMyAdapter2.notifyDataSetChanged();
                    break;

                default:
                    break;
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {

            }
        });
        sp2.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int pos, long arg3) {

                switch (pos) {
                case 0:
                    if (p == 0) {

                        qu.clear();
                    
                        for (String n : qu_chengdu)
                            qu.add(n);
                        mMyAdapter3.notifyDataSetChanged();

                    } else if (p == 1) {
                        qu.clear();
                        for (String n : qu_taiyuan)
                            qu.add(n);
                        mMyAdapter3.notifyDataSetChanged();
                    } else if (p == 2) {
                        qu.clear();
                        for (String n : qu_guangzhou)
                            qu.add(n);
                        mMyAdapter3.notifyDataSetChanged();
                    }

                    break;
                case 1:
                    if (p == 0) {
                        qu.clear();
                        for (String n : qu_mianyang)
                            qu.add(n);
                        mMyAdapter3.notifyDataSetChanged();
                    }
                    break;
                case 2:
                    if (p == 0) {
                        qu.clear();
                        for (String n : qu_guangyuan)
                            qu.add(n);
                        mMyAdapter3.notifyDataSetChanged();
                    }
                    break;

                default:
                    break;
                }
            }

            @Override
            public void onNothingSelected(AdapterView<?> arg0) {

            }
        });

    }

    private class MyAdapter1 extends ArrayAdapter {
        private Context context;
        private String[] sheng;
        private LayoutInflater flater;

        public MyAdapter1(Context context, int resource, String[] sheng) {
            super(context, resource, sheng);
            this.context = context;
            this.sheng = sheng;
            flater = LayoutInflater.from(context);
        }

        @Override
        public int getCount() {
            return sheng.length;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(sheng[position]);

            return convertView;
        }

        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(sheng[position]);

            return convertView;

        }

    }

    private class MyAdapter2 extends ArrayAdapter {
        private Context context;
        private ArrayList<String> citys;
        private LayoutInflater flater;

        public MyAdapter2(Context context, int resource, ArrayList<String> citys) {
            super(context, resource, citys);
            this.context = context;
            this.citys = citys;
            flater = LayoutInflater.from(context);
        }

        @Override
        public int getCount() {
            return citys.size();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(citys.get(position) + "");

            return convertView;
        }

        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(citys.get(position));

            return convertView;

        }

    }

    private class MyAdapter3 extends ArrayAdapter {
        private Context context;
        private ArrayList<String> qu;
        private LayoutInflater flater;

        public MyAdapter3(Context context, int resource, ArrayList<String> qu) {
            super(context, resource, qu);
            this.context = context;
            this.qu = qu;
            flater = LayoutInflater.from(context);
        }

        @Override
        public int getCount() {
            return qu.size();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(qu.get(position));

            return convertView;
        }

        @Override
        public View getDropDownView(int position, View convertView, ViewGroup parent) {
            if (convertView == null)
                convertView = flater.inflate(R.layout.list, null);

            TextView tv = (TextView) convertView.findViewById(R.id.tv1);
            tv.setText(qu.get(position));

            return convertView;

        }

    }

}

vales XML:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string-array name="sheng">
        <item>四川省</item>
        <item>山西省</item>
        <item>广东省</item>
    </string-array>
    
    <string-array name="city_sichuan">
        <item>成都</item>
        <item>绵阳</item>
        <item>广元</item>
        <item>巴中</item>
        <item>乐山</item>
        <item>眉山</item>
    </string-array>
    
    <string-array name="city_shanxi">
        <item>太原</item>
        <item>晋中</item>
        <item>介休</item>
        <item>大同</item>
        <item>运城</item>
        <item>长治</item>
    </string-array>
    
    <string-array name="city_guangdong">
        <item>广州</item>
        <item>深圳</item>
        <item>东莞</item>
        <item>云浮</item>
        <item>珠海</item>
        <item>湛江</item>
    </string-array>
    
    <string-array name="qu_chengdu">
        <item>金牛区</item>
        <item>青羊区</item>
        <item>成华区</item>
        <item>高新区</item>
        <item>武侯区</item>
        <item>锦江区</item>
    </string-array>
    
    <string-array name="qu_taiyuan">
        <item>迎泽区</item>
        <item>万柏林区</item>
        <item>杏花岭区</item>
        <item>小店区</item>
        <item>尖草坪区</item>
        <item>晋源区</item>
    </string-array>
    
    <string-array name="qu_guangzhou">
        <item>荔湾区</item>
        <item>海珠区</item>
        <item>越秀区</item>
        <item>天河区</item>
        <item>白云区</item>
        <item>花都区</item>
    </string-array>
    
    <string-array name="qu_mianyang">
        <item>培城区</item>
        <item>游仙区</item>
    </string-array>
    
    <string-array name="qu_guangyuan">
        <item>旺苍区</item>
        <item>剑阁区</item>
    </string-array>

</resources>

xml文件：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    tools:context="com.lixu.duocengxiala.MainActivity" >

    <Spinner
        android:id="@+id/sp1"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
     <Spinner
        android:id="@+id/sp2"
         android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
      <Spinner
        android:id="@+id/sp3"
         android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

</LinearLayout>

<?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:orientation="vertical" >

    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

程序运行效果图：