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Pull解析和Sax解析很相似，都是轻量级的解析，在Android的内核中已经嵌入了Pull，所以我们不需要再添加第三方jar包来支持 Pull。Pull解析和Sax解析不一样的地方有(1)pull读取xml文件后触发相应的事件调用方法返回的是数字(2)pull可以在程序中控制想解析到哪里就可以停止解析。看实例：
book.xml如下： Xml代码 1. < ?xml version="1.0" encoding="UTF-8"?> 2. < books> 3. < book id="12"> 4. < name>thinking in java< /name> 5. < price>85.5< /price> 6. < /book> 7. < book id="15"> 8. < name>Spring in Action< /name> 9. < price>39.0< /price> 10. < /book> 11. < /books> < ?xml version="1.0" encoding="UTF-8"?> < books> < book id="12"> < name>thinking in java< /name> < price>85.5< /price> < /book> < book id="15"> < name>Spring in Action< /name> < price>39.0< /price> < /book> < /books> Pull解析的代码如下PullParseService.java Java代码 1. import java.io.InputStream; 2. import java.util.ArrayList; 3. import java.util.List; 4. 5. import org.xmlpull.v1.XmlPullParser; 6. 7. import android.util.Xml; 8. 9. import com.xtlh.cn.entity.Book; 10. 11. public class PullParseService { 12. public static List< Book> getBooks(InputStream inputStream) throws Exception{ 13. List< Book> books = null; 14. Book book = null; 15. XmlPullParser parser = Xml.newPullParser(); 16. parser.setInput(inputStream, "UTF-8"); 17. 18. int event = parser.getEventType();//产生第一个事件 19. while(event!=XmlPullParser.END_DOCUMENT){ 20. switch(event){ 21. case XmlPullParser.START_DOCUMENT://判断当前事件是否是文档开始事件 22. books = new ArrayList< Book>();//初始化books集合 23. break; 24. case XmlPullParser.START_TAG://判断当前事件是否是标签元素开始事件 25. if("book".equals(parser.getName())){//判断开始标签元素是否是book 26. book = new Book(); 27. book.setId(Integer.parseInt(parser.getAttributeValue(0)));//得到book标签的属性值，并设置book的id 28. } 29. if(book!=null){ 30. if("name".equals(parser.getName())){//判断开始标签元素是否是name 31. book.setName(parser.nextText()); 32. }else if("price".equals(parser.getName())){//判断开始标签元素是否是price 33. book.setPrice(Float.parseFloat(parser.nextText())); 34. } 35. } 36. break; 37. case XmlPullParser.END_TAG://判断当前事件是否是标签元素结束事件 38. if("book".equals(parser.getName())){//判断结束标签元素是否是book 39. books.add(book);//将book添加到books集合 40. book = null; 41. } 42. break; 43. } 44. event = parser.next();//进入下一个元素并触发相应事件 45. }//end while 46. return books; 47. } 48. } import java.io.InputStream; import java.util.ArrayList; import java.util.List; import org.xmlpull.v1.XmlPullParser; import android.util.Xml; import com.xtlh.cn.entity.Book; public class PullParseService { public static List< Book> getBooks(InputStream inputStream) throws Exception{ List< Book> books = null; Book book = null; XmlPullParser parser = Xml.newPullParser(); parser.setInput(inputStream, "UTF-8"); int event = parser.getEventType();//产生第一个事件 while(event!=XmlPullParser.END_DOCUMENT){ switch(event){ case XmlPullParser.START_DOCUMENT://判断当前事件是否是文档开始事件 books = new ArrayList< Book>();//初始化books集合 break; case XmlPullParser.START_TAG://判断当前事件是否是标签元素开始事件 if("book".equals(parser.getName())){//判断开始标签元素是否是book book = new Book(); book.setId(Integer.parseInt(parser.getAttributeValue(0)));//得到book标签的属性值，并设置book的id } if(book!=null){ if("name".equals(parser.getName())){//判断开始标签元素是否是name book.setName(parser.nextText()); }else if("price".equals(parser.getName())){//判断开始标签元素是否是price book.setPrice(Float.parseFloat(parser.nextText())); } } break; case XmlPullParser.END_TAG://判断当前事件是否是标签元素结束事件 if("book".equals(parser.getName())){//判断结束标签元素是否是book books.add(book);//将book添加到books集合 book = null; } break; } event = parser.next();//进入下一个元素并触发相应事件 }//end while return books; } } 里面使用到的Book.java类 Java代码 1. public class Book { 2. private int id; 3. private String name; 4. private float price; 5. public int getId() { 6. return id; 7. } 8. public void setId(int id) { 9. this.id = id; 10. } 11. public String getName() { 12. return name; 13. } 14. public void setName(String name) { 15. this.name = name; 16. } 17. public float getPrice() { 18. return price; 19. } 20. public void setPrice(float price) { 21. this.price = price; 22. } 23. @Override 24. public String toString(){ 25. return this.id+":"+this.name+":"+this.price; 26. } 27. } public class Book { private int id; private String name; private float price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public float getPrice() { return price; } public void setPrice(float price) { this.price = price; } @Override public String toString(){ return this.id+":"+this.name+":"+this.price; } } 测试使用的是android的单元测试，代码如下： Java代码 1. import java.io.InputStream; 2. import java.util.List; 3. 4. import android.test.AndroidTestCase; 5. import android.util.Log; 6. 7. import com.xtlh.cn.entity.Book; 8. import com.xtlh.cn.service.PullParseService; 9. 10. public class testPullParseService extends AndroidTestCase{ 11. private static final String TAG = "testPullParseService"; 12. public void testPull() throws Exception{ 13. InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml"); 14. PullParseService pull = new PullParseService(); 15. List< Book> books = pull.getBooks(input); 16. for(Book book : books){ 17. Log.i(TAG,book.toString()); 18. } 19. } 20. } import java.io.InputStream; import java.util.List; import android.test.AndroidTestCase; import android.util.Log; import com.xtlh.cn.entity.Book; import com.xtlh.cn.service.PullParseService; public class testPullParseService extends AndroidTestCase{ private static final String TAG = "testPullParseService"; public void testPull() throws Exception{ InputStream input = this.getClass().getClassLoader().getResourceAsStream("book.xml"); PullParseService pull = new PullParseService(); List< Book> books = pull.getBooks(input); for(Book book : books){ Log.i(TAG,book.toString()); } } } 要使用android的单元测试，需要在AndroidManifest.xml文件中加入声明，AndroidManifest.xml如下： Xml代码 1. < ?xml version="1.0" encoding="utf-8"?> 2. < manifest xmlns:android="http://schemas./apk/res/android" 3. package="com.xlth.cn.demo" 4. android:versionCode="1" 5. android:versionName="1.0"> 6. < application android:icon="@drawable/icon" android:label="@string/app_name"> 7. < uses-library android:name="android.test.runner" /> 8. < activity android:name=".PullParseDemo" 9. android:label="@string/app_name"> 10. < intent-filter> 11. < action android:name="android.intent.action.MAIN" /> 12. < category android:name="android.intent.category.LAUNCHER" /> 13. < /intent-filter> 14. < /activity> 15. 16. < /application> 17. < uses-sdk android:minSdkVersion="7" /> 18. < instrumentation android:name="android.test.InstrumentationTestRunner" 19. android:targetPackage="com.xlth.cn.demo" android:label="Tests for My App" /> 20. < /manifest> < ?xml version="1.0" encoding="utf-8"?> < manifest xmlns:android="http://schemas./apk/res/android" package="com.xlth.cn.demo" android:versionCode="1" android:versionName="1.0"> < application android:icon="@drawable/icon" android:label="@string/app_name"> < uses-library android:name="android.test.runner" /> < activity android:name=".PullParseDemo" android:label="@string/app_name"> < intent-filter> < action android:name="android.intent.action.MAIN" /> < category android:name="android.intent.category.LAUNCHER" /> < /intent-filter> < /activity> < /application> < uses-sdk android:minSdkVersion="7" /> < instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.xlth.cn.demo" android:label="Tests for My App" /> < /manifest> Pull解析可以用于很多场合，例如接受google天气，rss新闻等，希望对大家有帮助 |
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