Android菜鸟的成长笔记——Spinner 省市县三级地址选择
一、 准备数据
在网上找了一份xml的数据源，链接在这：http://pan.baidu.com/s/1pJoHosr
在res文件夹下新建一个xml文件夹，将解压得到的3个xml文件放进去。
二、 解析xml文件
先看一下xml文件吧，是这个格式的
<resources>
<Province ID="0" ProvinceName="请选择">请选择 </Province>解析代码如下：
public ArrayList<Province> getProvincesInfo()
{
//设置xml解析器，为读取的数据创建ArrayList对象
XmlResourceParser xrp = getResources().getXml(R.xml.provinces);
ArrayList<Province> provinces = new ArrayList<>();
try
{
int eventType = xrp.getEventType();
while (eventType != XmlResourceParser.END_DOCUMENT)
{
//当内容标签开始时，读取相应标签的属性
if (eventType == XmlResourceParser.START_TAG && xrp.getName().equals("Province"))
{
String id = xrp.getAttributeValue(null, "ID");
String name = xrp.getAttributeValue(null, "ProvinceName");
provinces.add(new Province(Integer.parseInt(id), name));
}
eventType = xrp.next();
}
} catch (XmlPullParserException | IOException e)
{
e.printStackTrace();
}
xrp.close();
return provinces;
}
三、绑定数据
将数据信息读到ArrayList对象中就好办了，直接用ArrayAdapter绑定就可以了： //为控件绑定视图
Spinner spnProvince = (Spinner)findViewById(R.id.spnProvince);
//读取并绑定province数据
final ArrayList<Province> provinces = getProvincesInfo();
final ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,provinces);
spnProvince.setAdapter(adapter);因为ArrayList对象中的数据为自定义的Province，在Spinner中显示时会调用toString()函数，所以要在Province中重写toString函数，返回省份名称。
城市、和区域的选择都要依赖于上级的信息，在读取城市信息的时候需要传入省份的ID，来获取对应的城市，可以在读取标签属性的时候，判断传入的PID与读取的PID是否相等，来获取城市列表。
四、设置监听，实现城市和区域选择
数据绑定玩之后，就要设置监听了。
省份数据，在Activity onCreate的时候读入；城市数据，在选择了省份之后读入；区域数据在选择了城市之后读入。设置spnProvince的监听如下，在监听中读取数据，初始化子控件：
//为Province设置监听
spnProvince.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
//初始化城市列表
initSpnCity((int) id);
//选中“请选择”时不设置地址显示
if (id == 0)
{
//清空City、District选项
strProvince = "";
strCity = "";
strDistrict = "";
} else
{
strProvince = provinces.get((int) id).getName();
}
//显示选中的地址
tvAddress.setText(ADDRESS_TITLE + " " + strProvince + " " + strCity + " " + strDistrict);
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});到此，三级地址选择就搞定了
效果图
下面是源码，Province、City、District的实现代码就不贴了，记得重写toString()方法返回名称就可以了。
package com.lcy.demo.studydemo;
import android.content.res.XmlResourceParser;
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 android.widget.TextView;
import com.lcy.demo.studydemo.address.City;
import com.lcy.demo.studydemo.address.District;
import com.lcy.demo.studydemo.address.Province;
import org.xmlpull.v1.XmlPullParserException;
import java.io.IOException;
import java.util.ArrayList;
/**
* Created by loucyin on 2015/10/8.
*/
public class SpinnerActivity extends AppCompatActivity
{
public static final String ADDRESS_TITLE = "您选择的地址是：";
TextView tvAddress;
String strProvince = "";
String strCity = "";
String strDistrict = "";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_spinner);
//绑定地址显示TextView
tvAddress = (TextView)findViewById(R.id.tvAddress);
//初始化spinner控件
initSpnProvince();
}
//初始化spnProvince控件，并为其绑定数据，设置监听
public void initSpnProvince()
{
//为控件绑定视图
Spinner spnProvince = (Spinner)findViewById(R.id.spnProvince);
//读取并绑定province数据
final ArrayList<Province> provinces = getProvincesInfo();
final ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,provinces);
spnProvince.setAdapter(adapter);
//为Province设置监听
spnProvince.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
//初始化城市列表
initSpnCity((int) id);
//选中“请选择”时不设置地址显示
if (id == 0)
{
//清空City、District选项
strProvince = "";
strCity = "";
strDistrict = "";
} else
{
strProvince = provinces.get((int) id).getName();
}
//显示选中的地址
tvAddress.setText(ADDRESS_TITLE + " " + strProvince + " " + strCity + " " + strDistrict);
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
//初始化spnCity，并为其绑定数据，设置监听
public void initSpnCity(int provinceId)
{
//为控件绑定视图
final Spinner spnCity = (Spinner)findViewById(R.id.spnCity);
//读取并绑定province数据
final ArrayList<City> cities = getCitiesInfo(provinceId);
ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,cities);
spnCity.setAdapter(adapter);
//为Province设置监听
spnCity.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
//获取城市ID，并初始化区域列表
int cid = cities.get((int) id).getId();
initSpnDistrict(cid);
//选中“请选择”时不设置地址显示
if(id == 0)
{
strCity = "";
strDistrict = "";
}
else
{
strCity = cities.get((int) id).getName();
}
//显示选中的地址
tvAddress.setText(ADDRESS_TITLE + " " + strProvince + " " + strCity + " " + strDistrict);
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
//初始化spnDistrict控件，绑定数据，设置监听
public void initSpnDistrict(int cityId)
{
//为控件绑定视图
final Spinner spnDistrict = (Spinner)findViewById(R.id.spnDistrict);
//读取并绑定province数据
final ArrayList<District> districts = getDistrictInfo(cityId);
ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_list_item_1,districts);
spnDistrict.setAdapter(adapter);
spnDistrict.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id)
{
//选中“请选择”时不设置地址显示
if (id == 0)
{
strDistrict = "";
} else
{
strDistrict = districts.get((int) id).getName();
}
//显示选中的地址
tvAddress.setText(ADDRESS_TITLE + " " + strProvince + " " + strCity + " " + strDistrict);
}
@Override
public void onNothingSelected(AdapterView<?> parent)
{
}
});
}
/**
* @description 从文件中获取省份信息
* @return 返回省份的ArrayList对象
*/
public ArrayList<Province> getProvincesInfo()
{
//设置xml解析器，为读取的数据创建ArrayList对象
XmlResourceParser xrp = getResources().getXml(R.xml.provinces);
ArrayList<Province> provinces = new ArrayList<>();
try
{
int eventType = xrp.getEventType();
while (eventType != XmlResourceParser.END_DOCUMENT)
{
//当内容标签开始时，读取相应标签的属性
if (eventType == XmlResourceParser.START_TAG && xrp.getName().equals("Province"))
{
String id = xrp.getAttributeValue(null, "ID");
String name = xrp.getAttributeValue(null, "ProvinceName");
provinces.add(new Province(Integer.parseInt(id), name));
}
eventType = xrp.next();
}
} catch (XmlPullParserException | IOException e)
{
e.printStackTrace();
}
xrp.close();
return provinces;
}
/**
* @description 输入省份ID，获取对应的城市
* @param provinceId 省份ID，用于在选择其对应的城市
* @return 返回所包含城市的ArrayList对象
*/
public ArrayList<City> getCitiesInfo(int provinceId)
{
//设置xml解析器，为读取的数据创建ArrayList对象
XmlResourceParser xrp = getResources().getXml(R.xml.cities);
ArrayList<City> cities = new ArrayList<>();
cities.add(new City(0,0,"请选择",""));
try
{
int eventType = xrp.getEventType();
while (eventType != XmlResourceParser.END_DOCUMENT)
{
//当内容标签开始时，读取相应标签的属性
if (eventType == XmlResourceParser.START_TAG && xrp.getName().equals("City"))
{
String pid = xrp.getAttributeValue(null, "PID");
if (provinceId == Integer.parseInt(pid))
{
String id = xrp.getAttributeValue(null, "ID");
String zipCode = xrp.getAttributeValue(null, "ZipCode");
String name = xrp.getAttributeValue(null, "CityName");
cities.add(new City(Integer.parseInt(id), Integer.parseInt(pid), name, zipCode));
}
}
eventType = xrp.next();
}
} catch (XmlPullParserException | IOException e)
{
e.printStackTrace();
}
xrp.close();
return cities;
}
/**
* @description 输入城市ID，获取对应的区域
* @param cityId 城市ID，用于在选择其对应的区域
* @return 返回所包含区域的ArrayList对象
*/
public ArrayList<District> getDistrictInfo(int cityId)
{
//设置xml解析器，为读取的数据创建ArrayList对象
XmlResourceParser xrp = getResources().getXml(R.xml.districts);
ArrayList<District> districts = new ArrayList<>();
districts.add(new District(0,0,"请选择"));
try
{
int eventType = xrp.getEventType();
while (eventType != XmlResourceParser.END_DOCUMENT)
{
//当内容标签开始时，读取相应标签的属性
if (eventType == XmlResourceParser.START_TAG && xrp.getName().equals("District"))
{
String cid = xrp.getAttributeValue(null, "CID");
if (cityId == Integer.parseInt(cid))
{
String id = xrp.getAttributeValue(null, "ID");
String name = xrp.getAttributeValue(null, "DistrictName");
districts.add(new District(Integer.parseInt(id), cityId, name));
}
}
eventType = xrp.next();
}
} catch (XmlPullParserException | IOException e)
{
e.printStackTrace();
}
xrp.close();
return districts;
}
}
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/material_grey_300"> <TextView android:layout_width="80dp" android:layout_height="50dp" android:textAppearance="?android:attr/textAppearanceMedium" android:text="省份：" android:id="@+id/textView" android:gravity="center_vertical|center_horizontal" android:textColor="@android:color/holo_red_light"/> <Spinner android:layout_width="fill_parent" android:layout_height="50dp" android:id="@+id/spnProvince" android:spinnerMode="dropdown"/> </LinearLayout> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/material_grey_100"> <TextView android:layout_width="80dp" android:layout_height="50dp" android:textAppearance="?android:attr/textAppearanceMedium" android:text="城市：" android:id="@+id/textView2" android:gravity="center_vertical|center_horizontal" android:textColor="@android:color/holo_blue_bright"/> <Spinner android:layout_width="fill_parent" android:layout_height="50dp" android:id="@+id/spnCity" android:spinnerMode="dropdown"/> </LinearLayout> <LinearLayout android:orientation="horizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@color/material_grey_300"> <TextView android:layout_width="80dp" android:layout_height="50dp" android:textAppearance="?android:attr/textAppearanceMedium" android:text="区域：" android:id="@+id/textView3" android:gravity="center_vertical|center_horizontal" android:textColor="@android:color/holo_green_dark"/> <Spinner android:layout_width="fill_parent" android:layout_height="50dp" android:id="@+id/spnDistrict" android:spinnerMode="dropdown"/> </LinearLayout> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:text="@string/Address" android:id="@+id/tvAddress" android:gravity="center_vertical" android:paddingLeft="15dp" android:paddingTop="20dp" android:paddingRight="20dp" android:paddingBottom="20dp" android:background="@color/material_grey_100" android:textColor="@android:color/holo_orange_dark"/> </LinearLayout>