Android实现三级联动下拉框 下拉列表spinner的实例

主要实现办法：动态加载各级下拉值的适配器

在监听本级下拉框，当本级下拉框的选中值改变时，随之修改下级的适配器的绑定值

XML布局：

<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="wrap_content"
    android:orientation="horizontal"
    android:padding="8dp" >
    <Spinner
        android:id="@+id/spin_province"
        android:layout_width="80dp"
        android:layout_height="wrap_content" />
    <Spinner
        android:id="@+id/spin_city"
        android:layout_width="112dp"
        android:layout_height="wrap_content" />
    <Spinner
        android:id="@+id/spin_county"
        android:layout_width="100dp"
        android:layout_height="wrap_content" />
</LinearLayout>

package com.example.android.demo.spinner;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;

public class MainActivity extends Activity
{
    private Spinner provinceSpinner = null;  //省级（省、直辖市）
    private Spinner citySpinner = null;     //地级市
    private Spinner countySpinner = null;    //县级（区、县、县级市）
    ArrayAdapter<String> provinceAdapter = null;  //省级适配器
    ArrayAdapter<String> cityAdapter = null;    //地级适配器
    ArrayAdapter<String> countyAdapter = null;    //县级适配器
    static int provincePosition = 3;

    
    //省级选项值
    private String[] province = new String[] {"北京","上海","天津","广东"};//,"重庆","黑龙江","江苏","山东","浙江","香港","澳门"};
    //地级选项值
    private String[][] city = new String[][] 
            {
                    { "东城区", "西城区", "崇文区", "宣武区", "朝阳区", "海淀区", "丰台区", "石景山区", "门头沟区",
                            "房山区", "通州区", "顺义区", "大兴区", "昌平区", "平谷区", "怀柔区", "密云县",
                            "延庆县" },
                    { "长宁区", "静安区", "普陀区", "闸北区", "虹口区" },
                    { "和平区", "河东区", "河西区", "南开区", "河北区", "红桥区", "塘沽区", "汉沽区", "大港区",
                            "东丽区" },
                    { "广州", "深圳", "韶关" // ,"珠海","汕头","佛山","湛江","肇庆","江门","茂名","惠州","梅州",
                    // "汕尾","河源","阳江","清远","东莞","中山","潮州","揭阳","云浮"
                    }
            };

    //县级选项值
    private String[][][] county = new String[][][] 
            {
                    {   //北京
                        {"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},
                        {"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"}
                    },
                    {    //上海
                        {"无"},{"无"},{"无"},{"无"},{"无"}
                    },
                    {    //天津
                        {"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"},{"无"}
                    },
                    {    //广东
                        {"海珠区","荔湾区","越秀区","白云区","萝岗区","天河区","黄埔区","花都区","从化市","增城市","番禺区","南沙区"}, //广州
                        {"宝安区","福田区","龙岗区","罗湖区","南山区","盐田区"}, //深圳
                        {"武江区","浈江区","曲江区","乐昌市","南雄市","始兴县","仁化县","翁源县","新丰县","乳源县"}  //韶关
                    }
            };

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

        setSpinner();
    }
    
    /*
     * 设置下拉框
     */
    private void setSpinner()
    {        
        provinceSpinner = (Spinner)findViewById(R.id.spin_province);
        citySpinner = (Spinner)findViewById(R.id.spin_city);
        countySpinner = (Spinner)findViewById(R.id.spin_county);

        //绑定适配器和值
        provinceAdapter = new ArrayAdapter<String>(MainActivity.this,
                android.R.layout.simple_spinner_item, province);
        provinceSpinner.setAdapter(provinceAdapter);
        provinceSpinner.setSelection(3,true);  //设置默认选中项，此处为默认选中第4个值

        cityAdapter = new ArrayAdapter<String>(MainActivity.this, 
                android.R.layout.simple_spinner_item, city[3]);
        citySpinner.setAdapter(cityAdapter);
        citySpinner.setSelection(0,true);  //默认选中第0个

        countyAdapter = new ArrayAdapter<String>(MainActivity.this,
                android.R.layout.simple_spinner_item, county[3][0]);
        countySpinner.setAdapter(countyAdapter);
        countySpinner.setSelection(0, true);

        
        //省级下拉框监听
        provinceSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
        {
            // 表示选项被改变的时候触发此方法，主要实现办法：动态改变地级适配器的绑定值
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3)
            {
                //position为当前省级选中的值的序号

                //将地级适配器的值改变为city[position]中的值
                cityAdapter = new ArrayAdapter<String>(
                        MainActivity.this, android.R.layout.simple_spinner_item, city[position]);
                // 设置二级下拉列表的选项内容适配器
                citySpinner.setAdapter(cityAdapter);
                provincePosition = position;    //记录当前省级序号，留给下面修改县级适配器时用
            }
            @Override
            public void onNothingSelected(AdapterView<?> arg0)
            {

            }

        });

        
        //地级下拉监听
        citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
        {
            @Override
            public void onItemSelected(AdapterView<?> arg0, View arg1,
                    int position, long arg3)
            {
                countyAdapter = new ArrayAdapter<String>(MainActivity.this,
                        android.R.layout.simple_spinner_item, county[provincePosition][position]);
                countySpinner.setAdapter(countyAdapter);
            }
            @Override
            public void onNothingSelected(AdapterView<?> arg0)
            {

            }
        });
    }
}

provinceSpinner.getSelectedItem().toString();

citySpinner.getSelectedItem().toString();

countySpinner.getSelectedItem().toString();

THE END