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：

    省市区三级联动

    省市区三级联动

    省市区三级联动

    程序代码：

    核心代码：

    1.       <pre name="code" class="java">package com.jph.sevice;
    3. import java.io.InputStream;
    4. import java.util.ArrayList;
    5. import java.util.HashMap;
    6. import java.util.List;
    7. import java.util.Map;
    8. import org.xmlpull.v1.XmlPullParser;
    9. import android.os.Handler;
    10. import android.os.Message;
    11. import android.util.Xml;
    13. /**
    14. * 解析省、市、区xml
    15. * @author jph
    16. * Date：2014.09.25
    17. */
    18. public class PullProvince { 
    19. public static final int PARSESUCCWSS=0x2001;
    20. private Handler handler;
    21. public PullProvince(Handler handler) {
    22.     // TODO Auto-generated constructor stub
    23.     this.handler=handler;
    24. }
    25. /**
    26.  * 获取所有省份城市以及区  
    27.  * @author jph
    28.  * Date:2014.09.25  
    29.  */
    30. public void getProvinces(final InputStream inStream) {          
    31.     new Thread(new Runnable() {         
    32.         @Override
    33.         public void run() {
    34.             // TODO Auto-generated method stub
    35.             try {
    36.                 XmlPullParser pullParser = Xml.newPullParser();
    37.                 pullParser.setInput(inStream, "UTF-8");
    38.                 int event;
    39.                     event = pullParser.getEventType();
    40.                 Map<String, Map<String, List<String>>> provinces = new HashMap<String, 
    41.                         Map<String, List<String>>>();// 省份
    42.                 Map<String, List<String>> cities=null;// 城市     
    43.                 ArrayList<String> areaAll = null;
    44.                 String pName = "";// 省份名称
    45.                 String cName = "";// 城市名称
    46.                 String aName = "";// 地区名
    47.                 String targetName = "";// 当前节点的名称
    48.                 while (event != XmlPullParser.END_DOCUMENT) {
    49.                     targetName = pullParser.getName();
    50.                     switch (event) {
    51.                     case XmlPullParser.START_TAG:
    52.                         if ("province".equals(targetName)) {// 处理省份节点               
    53.                             pName = pullParser.getAttributeValue(0);// 当前省份名
    54.                             cities=new HashMap<String, List<String>>();
    55.                         } else if ("city".equals(targetName)) {// 处理城市节点                
    56.                             cName = pullParser.getAttributeValue(0);
    57.                             areaAll = new ArrayList<String>();// 地区
    58.                         } else if ("area".equals(targetName)) {// 处理地区节点
    59.                             aName = pullParser.getAttributeValue(0);
    60.                         }
    61.                         break;
    62.                     case XmlPullParser.END_TAG:
    63.                         if (targetName.equals("area")) {
    64.                             areaAll.add(aName);
    65.                         } else if (targetName.equals("city")) {
    66.                             cities.put(cName, areaAll);
    67.                         } else if (targetName.equals("province")) {
    68.                             provinces.put(pName, cities);
    69.                         }
    70.                         break;
    71.                     }
    72.                     event = pullParser.next();
    73.                 }
    74.                 Message message=new Message();                  
    75.                 message.obj=provinces;//将解析出的数据放到message中传给主线程
    76.                 message.what=PARSESUCCWSS;
    77.                 handler.sendMessage(message);//通知主线程数据解析完毕
    78.             } catch (Exception e) {
    79.                 // TODO Auto-generated catch block
    80.                 e.printStackTrace();
    81.             }       
    82.         }
    83.     }).start();     
    84. }
    85. }
    86.  
    87.

    Activity：

    1.       <pre name="code" class="java">package com.jph.px;
    3. import java.io.InputStream;
    4. import java.util.List;
    5. import java.util.Map;
    6. import com.jph.sevice.PullProvince;
    7. import android.os.Bundle;
    8. import android.os.Handler;
    9. import android.os.Message;
    10. import android.app.Activity;
    11. import android.view.View;
    12. import android.widget.AdapterView;
    13. import android.widget.AdapterView.OnItemSelectedListener;
    14. import android.widget.ArrayAdapter;
    15. import android.widget.Spinner;
    16. import android.widget.Toast;
    17. /**
    18. * 省,市,区三级联动
    19. * @author jph
    20. * Date:2014.09.25
    21. */
    22. public class MainActivity extends Activity {
    23. private Spinner province,city,area; 
    24. private Map<String, Map<String, List<String>>> data=null;
    25. /**当前的选择的省份**/
    26. private String currentProvince;
    27. /**当前的选择的城市**/
    28. private String currentCity;
    29. private PullProvince pullProvince;  
    30. //  /**当前的选择的区**/
    31. //  private String currentArea;
    32. private Handler mHandler=new Handler(){
    33. @SuppressWarnings("unchecked")
    34. @Override
    35. public void handleMessage(Message msg) {
    36.     // TODO Auto-generated method stub
    37.     switch (msg.what) {
    38.     case PullProvince.PARSESUCCWSS://数据解析完毕，加载数据
    39.         data=(Map<String, Map<String, List<String>>>) msg.obj;
    40.         initData();
    41.         break;
    42.     default:
    43.         break;
    44.     }
    45.     super.handleMessage(msg);
    46. }
    47. };
    48. @Override
    49. protected void onCreate(Bundle savedInstanceState) {
    50. super.onCreate(savedInstanceState);
    51. setContentView(R.layout.activity_main);
    52. province=(Spinner)findViewById(R.id.province);
    53. city=(Spinner)findViewById(R.id.city);
    54. area=(Spinner)findViewById(R.id.area);  
    55. pullProvince=new PullProvince(mHandler);
    56. InputStream inStream = this.getClass().getClassLoader().
    57.         getResourceAsStream("province_city.xml");       
    58. pullProvince.getProvinces(inStream);            
    59. }   
    60. /**
    61. * 初始化数据
    62. */
    63. private void initData(){        
    64. if (data!=null) {
    65.     String[]arrStrings= data.keySet().toArray(new String[0]);
    66.     System.out.println(arrStrings);         
    67.     //将省份信息填充到 province Spinner
    68.     province.setAdapter(new ArrayAdapter<String>(this, 
    69.             android.R.layout.simple_list_item_multiple_choice,arrStrings));
    70.     currentProvince=getCurrentProvince();   
    71.     bindCityAdapter(currentProvince);
    72.     currentCity=getCurrentCity();           
    73.     bindAreaAdapter(currentCity);           
    74.     setOnItemSelectedListener();            
    75. }
    76. }
    77. private void bindAreaAdapter(String currentCity) {
    78. // TODO Auto-generated method stub
    79. //根据当前显示的城市将对应的区填充到area Spinner     
    80. area.setAdapter(new ArrayAdapter<String>(this, 
    81.         android.R.layout.simple_list_item_multiple_choice,
    82.         data.get(currentProvince).get(currentCity)));
    83. }
    84. private void bindCityAdapter(String currentProvince) {
    85. // TODO Auto-generated method stub
    86. //根据当前显示的省份将对应的城市填充到city Spinner
    87. city.setAdapter(new ArrayAdapter<String>(this, 
    88.         android.R.layout.simple_list_item_multiple_choice,data.
    89.         get(currentProvince).keySet().toArray(new String[0])));
    90. }
    91. /**
    92. * 为Spinner设置监听器
    93. */
    94. private void setOnItemSelectedListener() {
    95. // TODO Auto-generated method stub
    96. province.setOnItemSelectedListener(new OnItemSelectedListener() {
    97.     @Override
    98.     public void onItemSelected(AdapterView<?> arg0, View arg1,
    99.             int arg2, long arg3) {
    100.         // TODO Auto-generated method stub
    101.         currentProvince=getCurrentProvince();
    102.         bindCityAdapter(currentProvince);
    103.     }
    105.     @Override
    106.     public void onNothingSelected(AdapterView<?> arg0) {
    107.         // TODO Auto-generated method stub
    109.     }
    110. });
    111. city.setOnItemSelectedListener(new OnItemSelectedListener() {
    112.     @Override
    113.     public void onItemSelected(AdapterView<?> arg0, View arg1,
    114.             int arg2, long arg3) {
    115.         // TODO Auto-generated method stub
    116.         currentCity=getCurrentCity();
    117.         bindAreaAdapter(currentCity);
    118.     }
    120.     @Override
    121.     public void onNothingSelected(AdapterView<?> arg0) {
    122.         // TODO Auto-generated method stub
    124.     }
    125. });
    126. area.setOnItemSelectedListener(new OnItemSelectedListener() {
    127.     @Override
    128.     public void onItemSelected(AdapterView<?> arg0, View arg1,
    129.             int arg2, long arg3) {
    130.         // TODO Auto-generated method stub
    131.         Toast.makeText(MainActivity.this,area.getSelectedItem().toString(), 
    132.                 Toast.LENGTH_SHORT).show(); 
    133.     }
    135.     @Override
    136.     public void onNothingSelected(AdapterView<?> arg0) {
    137.         // TODO Auto-generated method stub
    139.     }
    140. }); 
    141. }
    143. /**获取当前选择的省份
    144. * @return String:当前选择的省份
    145. */
    146. private String getCurrentProvince() {
    147. // TODO Auto-generated method stub
    148. return province.getSelectedItem().toString();
    149. }
    150. /**获取当前选择的城市
    151. * @return String:当前选择的城市
    152. */
    153. private String getCurrentCity() {
    154. // TODO Auto-generated method stub
    155. return city.getSelectedItem().toString();
    156. }
    157. }
    158.  
    159.

    布局文件：

    1.       <pre name="code" class="html"><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    2. xmlns:tools="http://schemas.android.com/tools"
    3. android:layout_width="match_parent"
    4. android:layout_height="match_parent"
    5. android:orientation="vertical" >
    6. <Spinner android:id="@+id/province"
    7.     android:layout_width="match_parent"
    8.     android:layout_height="wrap_content"
    9.     />
    10. <Spinner android:id="@+id/city"
    11.     android:layout_width="match_parent"
    12.     android:layout_height="wrap_content"/>
    13. <Spinner android:id="@+id/area"
    14.     android:layout_width="match_parent"
    15.     android:layout_height="wrap_content"/>
    16. <TextView android:id="@+id/tv"
    17.     android:layout_width="wrap_content"
    18.     android:layout_height="wrap_content"/>
    19. </LinearLayout>
    20.  
    21.