Android实现三级联动下拉框 下拉列表spinner
16lz
2022-08-01
Android实现（省、市、县）三级联动下拉框 下拉列表spinner
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：
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 provinceAdapter = null; //省级适配器ArrayAdapter cityAdapter = null;//地级适配器ArrayAdapter 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 } };@Overrideprotected 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(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(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(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( 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(){@Overridepublic void onItemSelected(AdapterView<?> arg0, View arg1,int position, long arg3){countyAdapter = new ArrayAdapter(MainActivity.this,android.R.layout.simple_spinner_item, county[provincePosition][position]);countySpinner.setAdapter(countyAdapter);}@Overridepublic 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()
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