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>

实现代码：

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)            {            }        });    }}

要获取下拉框spinner中选中的值，用下面这方法就OK了

provinceSpinner.getSelectedItem().toString();

citySpinner.getSelectedItem().toString();

countySpinner.getSelectedItem().toString();

THE END