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这篇博客介绍了如何在Android中实现省、市、县三级联动的下拉框（spinner），通过动态加载各级适配器，并在选中值改变时更新下级适配器。XML布局和获取选中值的方法也在内容中给出。
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：
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools=
"http://schemas.android.com/tools"
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android:layout_width=
"match_parent"
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android:layout_height=
"wrap_content"
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android:orientation=
"horizontal"
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android:padding=
"8dp" >
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<Spinner
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android:id=
"@+id/spin_province"
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android:layout_width=
"80dp"
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android:layout_height=
"wrap_content" />
-
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<Spinner
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android:id=
"@+id/spin_city"
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android:layout_width=
"112dp"
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android:layout_height=
"wrap_content" />
-
-
<Spinner
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android:id=
"@+id/spin_county"
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android:layout_width=
"100dp"
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android:layout_height=
"wrap_content" />
-
</LinearLayout>
实现代码：
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package com.example.android.demo.spinner;
-
-
import android.os.Bundle;
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import android.app.Activity;
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import android.view.View;
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import android.widget.AdapterView;
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import android.widget.ArrayAdapter;
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import android.widget.Spinner;
-
-
-
public
class MainActivity extends Activity
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{
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private Spinner provinceSpinner =
null;
//省级（省、直辖市）
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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
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ArrayAdapter<String> cityAdapter =
null;
//地级适配器
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ArrayAdapter<String> countyAdapter =
null;
//县级适配器
-
static
int provincePosition =
3;
-
-
-
//省级选项值
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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"};
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//地级选项值
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private String[][] city =
new String[][]
-
{
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{
"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",
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"延庆县" },
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{
"长宁区",
"静安区",
"普陀区",
"闸北区",
"虹口区" },
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{
"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" },
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{
"广州",
"深圳",
"韶关"
// ,"珠海","汕头","佛山","湛江","肇庆","江门","茂名","惠州","梅州",
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// "汕尾","河源","阳江","清远","东莞","中山","潮州","揭阳","云浮"
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}
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};
-
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//县级选项值
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private String[][][] county =
new String[][][]
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{
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{
//北京
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{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},
-
{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"}
-
},
-
{
//上海
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{
"无"},{
"无"},{
"无"},{
"无"},{
"无"}
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},
-
{
//天津
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{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"},{
"无"}
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},
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{
//广东
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{
"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
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{
"宝安区",
"福田区",
"龙岗区",
"罗湖区",
"南山区",
"盐田区"},
//深圳
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{
"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
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}
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};
-
-
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@Override
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protected void onCreate(Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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setContentView(R.layout.activity_main);
-
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setSpinner();
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}
-
-
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/*
-
* 设置下拉框
-
*/
-
private void setSpinner()
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{
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provinceSpinner = (Spinner)findViewById(R.id.spin_province);
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citySpinner = (Spinner)findViewById(R.id.spin_city);
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countySpinner = (Spinner)findViewById(R.id.spin_county);
-
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//绑定适配器和值
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provinceAdapter =
new ArrayAdapter<String>(MainActivity.
this,
-
android.R.layout.simple_spinner_item, province);
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provinceSpinner.setAdapter(provinceAdapter);
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provinceSpinner.setSelection(
3,
true);
//设置默认选中项，此处为默认选中第4个值
-
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cityAdapter =
new ArrayAdapter<String>(MainActivity.
this,
-
android.R.layout.simple_spinner_item, city[
3]);
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citySpinner.setAdapter(cityAdapter);
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citySpinner.setSelection(
0,
true);
//默认选中第0个
-
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countyAdapter =
new ArrayAdapter<String>(MainActivity.
this,
-
android.R.layout.simple_spinner_item, county[
3][
0]);
-
countySpinner.setAdapter(countyAdapter);
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countySpinner.setSelection(
0,
true);
-
-
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//省级下拉框监听
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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
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@Override
-
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long arg3)
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{
-
//position为当前省级选中的值的序号
-
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//将地级适配器的值改变为city[position]中的值
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cityAdapter =
new ArrayAdapter<String>(
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MainActivity.
this, android.R.layout.simple_spinner_item, city[position]);
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// 设置二级下拉列表的选项内容适配器
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citySpinner.setAdapter(cityAdapter);
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provincePosition = position;
//记录当前省级序号，留给下面修改县级适配器时用
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}
-
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@Override
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public void onNothingSelected(AdapterView<?> arg0)
-
{
-
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}
-
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});
-
-
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//地级下拉监听
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citySpinner.setOnItemSelectedListener(
new AdapterView.OnItemSelectedListener()
-
{
-
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@Override
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public void onItemSelected(AdapterView<?> arg0, View arg1,
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int position,
long arg3)
-
{
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countyAdapter =
new ArrayAdapter<String>(MainActivity.
this,
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android.R.layout.simple_spinner_item, county[provincePosition][position]);
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countySpinner.setAdapter(countyAdapter);
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}
-
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@Override
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public void onNothingSelected(AdapterView<?> arg0)
-
{
-
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}
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});
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}
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}
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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