2019独角兽企业重金招聘Python工程师标准>>> 
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
先贴出效果图：
主布局代码：
主activity代码：
package com.yaowen.wheel;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import com.yaowen.android_wheel.R;
public class WheelActivity extends AppCompatActivity {
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", "香港", "澳门"};
private String[][] city = new String[][]{
{"不限", "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"},//北京市
{"不限", "长宁区", "静安区", "普陀区", "闸北区", "虹口区"},//上海市
{"不限", "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"},//天津市
{"不限", "广州", "深圳", "湛江", "韶关", "珠海", "汕头", "佛山", "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"},//广东省
{"全香港"},//香港
{"全澳门"}//澳门
};
private String[][][] county = new String[][][]{
//北京
{{"不限"}, {"全东城区"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}},
//上海
{{"不限"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}},
//天津
{{"不限"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}, {"无"}},
//广东
{{"不限"}, {"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
{"不限", "宝安区", "福田区", "龙岗区", "罗湖区", "南山区", "盐田区"},//深圳
{"不限", "遂溪县", "坡头区", "麻章区", "吴川市", "廉江市", "徐闻县", "雷州市"},//湛江市
{"不限", "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"},//韶光
},
//香港
{{"全香港"}},
//澳门
{{"全澳门"}}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wheel);
setSpinner();
}
private void setSpinner() {
//初始化组件
provinceSpinner = (Spinner) findViewById(R.id.spin_province);
citySpinner = (Spinner) findViewById(R.id.spin_city);
countySpinner = (Spinner) findViewById(R.id.spin_county);
//绑定provinceAdapter适配器和值
provinceAdapter = new ArrayAdapter
(WheelActivity.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
//绑定cityAdapter适配器和值
cityAdapter = new ArrayAdapter(WheelActivity.this, android.R.layout.simple_spinner_item, city[3]);
citySpinner.setAdapter(cityAdapter);
citySpinner.setSelection(0, true); //默认选中第0个
//绑定countyAdapter适配器和值
countyAdapter = new ArrayAdapter(WheelActivity.this, android.R.layout.simple_spinner_item, county[3][0]);
countySpinner.setAdapter(countyAdapter);
countySpinner.setSelection(0, true);
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(
WheelActivity.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) {
}
});
citySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView arg0, View arg1, int position, long arg3) {
countyAdapter = new ArrayAdapter(
WheelActivity.this, android.R.layout.simple_spinner_item, county[provincePosition][position]);
countySpinner.setAdapter(countyAdapter);
}
@Override
public void onNothingSelected(AdapterView arg0) {
}
});
}
} 代码就这么多，就这么简答！