请尊重他人的劳动成果，转载请注明出处：Android开发之解析XML并实现三级联动效果
本实例主要应用XmlPullParser解析XML文档中的省市区，然后将数据绑定到Spinner上实现三级联动的效果。关于XmlPullParser的详解大家可以参考《Android开发之使用PULL解析和生成XML》一文。
运行效果图：
程序代码：
核心代码：
<pre name="code" class="java">package com.jph.sevice;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.xmlpull.v1.XmlPullParser;
import android.os.Handler;
import android.os.Message;
import android.util.Xml;
/**
* 解析省、市、区xml
* @author jph
* Date：2014.09.25
*/
public class PullProvince {
public static final int PARSESUCCWSS=0x2001;
private Handler handler;
public PullProvince(Handler handler) {
// TODO Auto-generated constructor stub
this.handler=handler;
}
/**
* 获取所有省份城市以及区
* @author jph
* Date:2014.09.25
*/
public void getProvinces(final InputStream inStream) {
new Thread(new Runnable() {
@Override
public void run() {
// TODO Auto-generated method stub
try {
XmlPullParser pullParser = Xml.newPullParser();
pullParser.setInput(inStream, "UTF-8");
int event;
event = pullParser.getEventType();
Map<String, Map<String, List<String>>> provinces = new HashMap<String,
Map<String, List<String>>>();// 省份
Map<String, List<String>> cities=null;// 城市
ArrayList<String> areaAll = null;
String pName = "";// 省份名称
String cName = "";// 城市名称
String aName = "";// 地区名
String targetName = "";// 当前节点的名称
while (event != XmlPullParser.END_DOCUMENT) {
targetName = pullParser.getName();
switch (event) {
case XmlPullParser.START_TAG:
if ("province".equals(targetName)) {// 处理省份节点
pName = pullParser.getAttributeValue(0);// 当前省份名
cities=new HashMap<String, List<String>>();
} else if ("city".equals(targetName)) {// 处理城市节点
cName = pullParser.getAttributeValue(0);
areaAll = new ArrayList<String>();// 地区
} else if ("area".equals(targetName)) {// 处理地区节点
aName = pullParser.getAttributeValue(0);
}
break;
case XmlPullParser.END_TAG:
if (targetName.equals("area")) {
areaAll.add(aName);
} else if (targetName.equals("city")) {
cities.put(cName, areaAll);
} else if (targetName.equals("province")) {
provinces.put(pName, cities);
}
break;
}
event = pullParser.next();
}
Message message=new Message();
message.obj=provinces;//将解析出的数据放到message中传给主线程
message.what=PARSESUCCWSS;
handler.sendMessage(message);//通知主线程数据解析完毕
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}).start();
}
}
Activity：
<pre name="code" class="java">package com.jph.px;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import com.jph.sevice.PullProvince;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
/**
* 省,市,区三级联动
* @author jph
* Date:2014.09.25
*/
public class MainActivity extends Activity {
private Spinner province,city,area;
private Map<String, Map<String, List<String>>> data=null;
/**当前的选择的省份**/
private String currentProvince;
/**当前的选择的城市**/
private String currentCity;
private PullProvince pullProvince;
// /**当前的选择的区**/
// private String currentArea;
private Handler mHandler=new Handler(){
@SuppressWarnings("unchecked")
@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method stub
switch (msg.what) {
case PullProvince.PARSESUCCWSS://数据解析完毕，加载数据
data=(Map<String, Map<String, List<String>>>) msg.obj;
initData();
break;
default:
break;
}
super.handleMessage(msg);
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
province=(Spinner)findViewById(R.id.province);
city=(Spinner)findViewById(R.id.city);
area=(Spinner)findViewById(R.id.area);
pullProvince=new PullProvince(mHandler);
InputStream inStream = this.getClass().getClassLoader().
getResourceAsStream("province_city.xml");
pullProvince.getProvinces(inStream);
}
/**
* 初始化数据
*/
private void initData(){
if (data!=null) {
String[]arrStrings= data.keySet().toArray(new String[0]);
System.out.println(arrStrings);
//将省份信息填充到 province Spinner
province.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice,arrStrings));
currentProvince=getCurrentProvince();
bindCityAdapter(currentProvince);
currentCity=getCurrentCity();
bindAreaAdapter(currentCity);
setOnItemSelectedListener();
}
}
private void bindAreaAdapter(String currentCity) {
// TODO Auto-generated method stub
//根据当前显示的城市将对应的区填充到area Spinner
area.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice,
data.get(currentProvince).get(currentCity)));
}
private void bindCityAdapter(String currentProvince) {
// TODO Auto-generated method stub
//根据当前显示的省份将对应的城市填充到city Spinner
city.setAdapter(new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_multiple_choice,data.
get(currentProvince).keySet().toArray(new String[0])));
}
/**
* 为Spinner设置监听器
*/
private void setOnItemSelectedListener() {
// TODO Auto-generated method stub
province.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
currentProvince=getCurrentProvince();
bindCityAdapter(currentProvince);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
city.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
currentCity=getCurrentCity();
bindAreaAdapter(currentCity);
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
area.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int arg2, long arg3) {
// TODO Auto-generated method stub
Toast.makeText(MainActivity.this,area.getSelectedItem().toString(),
Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
/**获取当前选择的省份
* @return String:当前选择的省份
*/
private String getCurrentProvince() {
// TODO Auto-generated method stub
return province.getSelectedItem().toString();
}
/**获取当前选择的城市
* @return String:当前选择的城市
*/
private String getCurrentCity() {
// TODO Auto-generated method stub
return city.getSelectedItem().toString();
}
}
布局文件：
<pre name="code" class="html"><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="match_parent"
android:orientation="vertical" >
<Spinner android:id="@+id/province"
android:layout_width="match_parent"
android:layout_height="wrap_content"
/>
<Spinner android:id="@+id/city"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<Spinner android:id="@+id/area"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<TextView android:id="@+id/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>